labpython-users — LabPython users mailing list

Re: [LabPython-Users] Numpy and Scipy

[Rolf K. <rol...@ci...>]

Hi Glen

So numpy and scipy functions can be used as long as native data types are
used?  That may cause some problems since I am trying to perform matrix
operations.  I am using LabVIEW 8.20 with python 2.5.2 and labpython 1.2.2
on Windows XP.  I am trying to pass a 2D array of floats to python. 

It should be possible. The way I solved arrays in LabPython was to treat
them as lists. Consequently 2D arrays are lists of lists. It is not very
efficient but Python does even in 2.5 not give you an exported array C API
with which I could retrieve any information from a numpy array, despite the
fact that the Python core does know an array datatype.
 
It would be possible to add something like that to LabPython by making use
of the numpy extension and its exported C API but at the time I was
developing LabPython numpy was just in its infancy taking over from its
predecessor the numerical library. That API seemed not at all stable to me
at that point and making LabPython depend only softly on it (meaning it
would still work but without support of numpy datatypes) would also be some
serious thinkering.
 
I may take a look how numpy interfaces with Python to solve the array
interface issue but to do it right would be a majour undertaking and I have
a real job to do that pays the bills.
 
Rolf Kalbermatter

Re: [LabPython-Users] Numpy and Scipy

[Glen S. <gle...@gm...>]

Hi everyone,

So numpy and scipy functions can be used as long as native data types are
used?  That may cause some problems since I am trying to perform matrix
operations.  I am using LabVIEW 8.20 with python 2.5.2 and labpython 1.2.2
on Windows XP.  I am trying to pass a 2D array of floats to python.

Glen

2008/6/5 Rolf Kalbermatter <rol...@ci...>:

> Hi Luc
>
> > I think I was the person who had trouble with numpy...
> > Indeed, when I cast all my variables to python 'native' types
> > such as 'list', then I don't get into trouble.
>
> I recently looked into this and I have a problem to see a crash as you
> would say it does.
>
> I tried it in LabVIEW 6.0.2 and with Python 2.5.2 as well as with
> LabVIEW 8.0.1 and I simply get an error 1048 from the script node
> back. I'm using labpython 1.2.2 as available from sourceforge download.
>
> Can you give me some more details about your system?
>
> Rolf Kalbermatter
>
>
> -------------------------------------------------------------------------
> Check out the new SourceForge.net Marketplace.
> It's the best place to buy or sell services for
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Re: [LabPython-Users] Numpy and Scipy

[Rolf K. <rol...@ci...>]

Hi Luc

> I think I was the person who had trouble with numpy... 
> Indeed, when I cast all my variables to python 'native' types 
> such as 'list', then I don't get into trouble.

I recently looked into this and I have a problem to see a crash as you
would say it does.

I tried it in LabVIEW 6.0.2 and with Python 2.5.2 as well as with
LabVIEW 8.0.1 and I simply get an error 1048 from the script node
back. I'm using labpython 1.2.2 as available from sourceforge download.

Can you give me some more details about your system?

Rolf Kalbermatter

Re: [LabPython-Users] Numpy and Scipy

[Luc E. <luc...@en...>]

Hi,

I think I was the person who had trouble with numpy... Indeed, when I cast
all my variables to python 'native' types such as 'list', then I don't get
into trouble.

best regards,
luc

> Hi Glen,
>
> I'm quite new to LabPython and am having trouble getting my program to
> work
> when compiled and called from LabVIEW.  LabVIEW loads, compiles and sends
> variables to the program without problem but the program won't get past
> the
> first function.  The function uses numpy routines and the only thing I can
> think of is that maybe there's a problem with using numpy and scipy in
> LabVIEW.  Does anyone know if this is the case?
>
> Indeed it is. I believe it is not so much the numpy itself if I remember
> correctly but the fact that I couldn't see an easy way of supporting numpy
> (and other optional packages) datatypes in my C binding without compiling
> those packages into LabPython itself.
>
> If you look at the mailing archive there was a similar inquiry a few
> months
> back and the solution was to use normal numeric datatype by casting
> instead
> and live with the implicit conversion this will cause.
>
> Rolf Kalbermatter
> -------------------------------------------------------------------------
> Check out the new SourceForge.net Marketplace.
> It's the best place to buy or sell services for
> just about anything Open Source.
> http://sourceforge.net/services/buy/index.php_______________________________________________
> LabPython-Users mailing list
> Lab...@li...
> https://lists.sourceforge.net/lists/listinfo/labpython-users
>

Re: [LabPython-Users] Numpy and Scipy

[Rolf K. <rol...@ci...>]

Hi Glen,

I'm quite new to LabPython and am having trouble getting my program to work
when compiled and called from LabVIEW.  LabVIEW loads, compiles and sends
variables to the program without problem but the program won't get past the
first function.  The function uses numpy routines and the only thing I can
think of is that maybe there's a problem with using numpy and scipy in
LabVIEW.  Does anyone know if this is the case?

Indeed it is. I believe it is not so much the numpy itself if I remember
correctly but the fact that I couldn't see an easy way of supporting numpy
(and other optional packages) datatypes in my C binding without compiling
those packages into LabPython itself.
 
If you look at the mailing archive there was a similar inquiry a few months
back and the solution was to use normal numeric datatype by casting instead
and live with the implicit conversion this will cause.
 
Rolf Kalbermatter 

[LabPython-Users] Numpy and Scipy

[Glen S. <gle...@gm...>]

Hi,

I'm quite new to LabPython and am having trouble getting my program to work
when compiled and called from LabVIEW.  LabVIEW loads, compiles and sends
variables to the program without problem but the program won't get past the
first function.  The function uses numpy routines and the only thing I can
think of is that maybe there's a problem with using numpy and scipy in
LabVIEW.  Does anyone know if this is the case?

Thanks,
Glen

Re: [LabPython-Users] Need some inputs about LabPython

[Rolf K. <r.k...@hc...>]

Hi,

>I have tried with "System Exec.vi" option in labview, able to calling
pythonnet
>but unable to send commands and arguments to run python script (i.e.
Import
>pythonscript name)

I do not know pythonnet and can not give you any advice in what might be
wrong
that it does not work.

You asked on the LapPython list. There are probably dozen possible venues to
call some Python script from LaVIEW. LabPython gives you two distinct ways
to
do that as explained in my earlier answer.

>(Basically this python script calls some other DLL and print some message,
to
>run the script using Python net in my application .To run my script in
python
>net using following commands: import pythonscript name)

The import command will usually require the Python kernel to load an
external
module in form of a python script or a compiled DLL. Python looks in
specific
places for such external modules that can and will usually vary on the
actual
Python binary distribution your access method uses. There is a global
variable
in Python that you can use to add your own custom locations to this search
paths.

> I heard we can call pythonscripts from LabPython also. If u know please
tell me.
> If you have samples".VI " please send to me. If you want clarification
from my
> side please let me know.

You will have to download the LabPython OpenG package Version 1.2.2 from
sourceforge
and install it using the VIPM that you can download from
http://jkisoft.com/vipm/. 
That package contains a few simple examples that are installed in
examples/labpython
inside your LabVIEW directory, for how to call your own Python script in
LabVIEW
through LabPython.

As I'm not currently using LabPython actively I can't send you any other
examples
than what comes with the package.

Sincerely

Rolf Kalbermatter
CIT Engineering Netherlands
Kanaalweg 25-33                   Tel: +31 10 442 1701
2903 LR Capelle a/d IJssel        Fax: +31 10 442 1712
Netherlands                       http://www.citengineering.com
 

Re: [LabPython-Users] Need some inputs about LabPython

[sambasivareddy <sam...@pa...>]

Hi Rolf,

 

First of all I am very thankful for your response. Giving some more
clarification on my queries.

 

I have tried with "System Exec.vi" option in labview, able to calling
pythonnet but unable to send commands and arguments to run python script
(i.e.  import pythonscript name)

 

(Basically this python script calls some other DLL and print some message,
to run the script using Python net in my application .To run my script in
python net using following commands: import pythonscript name)

 

I hard we can call pythonscripts from LabPython also. If u know please tell
me. If you have samples".VI " please send to me. If you want clarification
from my side please let me know.

 

 

Thanks in advance.

 

Regards,

Sambasivareddy.S

 

-----Original Message-----
From: Rolf Kalbermatter [mailto:r.k...@hc...] 
Sent: Wednesday, March 12, 2008 1:14 PM
To: sam...@pa...; 'LabPython Users Mailing List'
Subject: RE: [LabPython-Users] Need some inputs about LabPython

 

Hi 

 

> I am new to this community. Need some inputs from the community.

 

Welcome here!     

 

> Questions: How can I call python script from Lab View?

> (Basically this script calls some other DLL and print some message in my

application)

 

Well you will have to make sure the Python engine can find the DLL. There is

a directory in Python where you can drop in Python extensions or if that is

not what you want you can change a global path variable in Python to tell it

where it can find and load additional modules.

You'll have to change that path before you run a script that tries to load

that Python module. Don't know offhand what name it has but this should be

documented in the Python docs.

 

> In how many ways we can call Python scripts from lab view?

 

Hmm, not sure I understand that question! Personally I would say two! Once

in the script node, writing (or copy-paste) your script into it and once

through the API Vis that allow to give you dynamic script execution.

       

Rolf Kalbermatter

CIT Engineering Netherlands

Kanaalweg 25-33                   Tel: +31 10 442 1701

2903 LR Capelle a/d IJssel        Fax: +31 10 442 1712

Netherlands                       http://www.citengineering.com

 


http://www.patni.com
World-Wide Partnerships. World-Class Solutions.
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Re: [LabPython-Users] Labview crash

[Luc E. <luc...@en...>]

Hi Rolf,

thank you for your answer. I am using the script note box (LV 8.0 ; Python
2.5). Here are two examples that describe you the situation :
if I put in the script box the following code :

  from numpy import random  #numpy is version 1.0.5
  a = list(random.permutation(23)) #<-I cast to a list

and I output 'a' to Labview as a Float Vector, everyting goes well, and I
collect the requested vector in Labview.
In the contrary, if I use the following code in the script node (still
outputing 'a' as a Float Vector):

  from numpy import random
  a = random.permutation(23) #<-I don't cast to a list

I get a nice Labview crash instead of an error ! (notice that by using
scipy instead of numpy, it usually also crashes)

Attached is a vi that contains the "crashing" example.

Thank you very much for your kind help,
luc

> Hi Luc,
>
>> I am using the excellent Labpython to run python 2.5 scripts
>> in Labview 8.0 Overall, it works very well. I have however one issue :
>> When I output a variable from python to Labview, and I forget
>> to match correctly the types in the two softwares (for
>> example, output a python numpy array as a Labview float
>> vector), I get a Labview crash.
>>
>> Would it be possible to ensure that Labview simply throws an
>> error in this case ?
>
> Can you elaborate a bit more about this? Are you using the script node
> box or the VIs? Can you provide an example of what you try to do?
>
> Rolf Kalbermatter
>

Re: [LabPython-Users] Need some inputs about LabPython

[Rolf K. <r.k...@hc...>]

Hi 

> I am new to this community. Need some inputs from the community.

Welcome here!	 

> Questions: How can I call python script from Lab View?
> (Basically this script calls some other DLL and print some message in my
application)

Well you will have to make sure the Python engine can find the DLL. There is
a directory in Python where you can drop in Python extensions or if that is
not what you want you can change a global path variable in Python to tell it
where it can find and load additional modules.
You'll have to change that path before you run a script that tries to load
that Python module. Don't know offhand what name it has but this should be
documented in the Python docs.

> In how many ways we can call Python scripts from lab view?

Hmm, not sure I understand that question! Personally I would say two! Once
in the script node, writing (or copy-paste) your script into it and once
through the API Vis that allow to give you dynamic script execution.
	 
Rolf Kalbermatter
CIT Engineering Netherlands
Kanaalweg 25-33                   Tel: +31 10 442 1701
2903 LR Capelle a/d IJssel        Fax: +31 10 442 1712
Netherlands                       http://www.citengineering.com
 

[LabPython-Users] Need some inputs about LabPython

[sambasivareddy <sam...@pa...>]

Hi all,

 

I am new to this community. Need some inputs from the community.

 

Questions:

*         How can I call python script from Lab View?

  (Basically this script calls some other DLL and print some message in my
application)

*         In how many ways we can call Python scripts from lab view?

 

If you people want any information from my side please let me know.

 

Thanks and Regards,

Sambasivareddy

 


http://www.patni.com
World-Wide Partnerships. World-Class Solutions.
_____________________________________________________________________

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Re: [LabPython-Users] Labview crash

[Rolf K. <r.k...@hc...>]

Hi Luc,

> I am using the excellent Labpython to run python 2.5 scripts 
> in Labview 8.0 Overall, it works very well. I have however one issue :
> When I output a variable from python to Labview, and I forget 
> to match correctly the types in the two softwares (for 
> example, output a python numpy array as a Labview float 
> vector), I get a Labview crash.
> 
> Would it be possible to ensure that Labview simply throws an 
> error in this case ?

Can you elaborate a bit more about this? Are you using the script node
box or the VIs? Can you provide an example of what you try to do?

Rolf Kalbermatter

[LabPython-Users] Labview crash

[Luc E. <luc...@en...>]

Dear Labpython list,

I am using the excellent Labpython to run python 2.5 scripts in Labview 8.0
Overall, it works very well. I have however one issue :
When I output a variable from python to Labview, and I forget to match
correctly the types in the two softwares (for example, output a python
numpy array as a Labview float vector), I get a Labview crash.

Would it be possible to ensure that Labview simply throws an error in this
case ?

Thank you very much,

luc Estebanez
-------------
Département de biologie,
Ecole Normale Supérieure
46 rue d'Ulm,
75005 Paris, France

Re: [LabPython-Users] Need help about labpython

[Rolf K. <r.k...@hc...>]

Fabien NOIRY [Fab...@tm...] wrote:

> I have an application Python 2.4 which works correctly .
> I want to call this applcation with LabView 7.1.
> But when i use code of "PYTHON Symple Execute__ogtk.vi" , i 
> succeed to call the main program ( "import sys 
> sys.path.append ("Path") import connectCOM") but after the 
> main doesn't work . Message Error indicates that there is a 
> problem to find the import program. So I tried to strore all 
> my program in the same directory. But there is each times defaults.
> So i would like to know if Labpython allows to execute all 
> codes Python.

I'm not sure I can understand your problem exactly. In theory everything
that is built into your Python server should work without problems.
As I'm not doing much with Python these days I can't help you with much
experience. From what I can see you probably have a problem that the
"import connectCOM" does not succeed since it can't locate the connectCOM
module.

LabPython does absolutely nothing to setup the actual Python environment
beyond what the Python server does on its own by default. I would guess
that a normal Python command shell would set some paths such as where to
search for modules if they can't be found in builtin, and other such stuff
and that in order for such things to work you will have to do this setup
yourself in your script before trying to use such features.

The reason LabPython does not do these things automatically is that it all
depends on the installed Python server and version thereof and I have tried
to make LabPython as version and distribution agnostic as possible, which
is documented by the fact that you can configure to which Python DLL it
should link.

Maybe that
http://www.python.org/doc/current/inst/search-path.html#SECTION0004100000000
00000000
could be of help to you to see what ways you have to set the search path
correctly.

Also printing out the sys.path into a variable inside LabPython to see what
it is in your setup, might help giving you an idea what you may need to do
differently.

Rolf Kalbermatter

[LabPython-Users] Need help about labpython

[Fabien N. <Fab...@tm...>]

Hello,
I send this email to have a few informations.
I have an application Python 2.4 which works correctly .
I want to call this applcation with LabView 7.1.
But when i use code of "PYTHON Symple Execute__ogtk.vi" , i succeed to =
call the main program ( "import sys
sys.path.append ("Path")
import connectCOM")
but after the main doesn't work . Message Error indicates that there is =
a problem to find the import program. So I tried to strore all my =
program in the same directory. But there is each times defaults.
So i would like to know if Labpython allows to execute all codes Python.
=20
The Error arrive when Labview executes "Execute script.vi"
=20
Thanks lot
=20
Fabien

Re: [LabPython-Users] New to group ( package for python 2.5)

[Todd L. <tl...@cy...>]

>> It's probably due to my setup - and it is not at all critical 
>> since I will be using the inline vi's - but the odd behaviour 
>> I see is that the script node doesn't place properly in 7.1.1 
>> or 8.5. I have to copy the script node from inside the Python 
>> Script Node vi, or place a matlab or xmath (or the other 
>> one), then change it to python. The very first time I placed 
>> the python node, it worked right. But that was the only time.
> 
> Well it seems the menu file lost the merge flag for the script
> node. Editing back in the palette menu editor should fix the
> behaviour.
> 
> I've attached a copy of it here. It goes in
> user.lib\_dynamicpalette_dirs\OpenG            and 
> user.lib\_dynamicpalette_dirs\comm

I replaced these for 7.1.1 and 8.5. They both merge now.


>> Also, when I right-click on the node, the context menu briefly
>> flashes, the matlab app flashes on the start bar, and I can't
>> add an input or the like. I have to ctrl-right click, then I
>> can add an input - though, oddly, the matlab app still flashes
>> on the start bar.
> 
> This is strange. I can't imagine what would cause this. I don't
> see this but I do not have Matlab installed.

I tried this again. Now 8.5 works fine, but 7.1.1 still flashes matlab. In 
8.5 it looks like the activeX connection to matlab is handled differently 
than in 7.1.1.

Thanks again,
--Todd Lesher

Re: [LabPython-Users] New to group ( package for python 2.5)

[Rolf K. <r.k...@hc...>]

Todd Lesher wrote:

> It's probably due to my setup - and it is not at all critical 
> since I will be using the inline vi's - but the odd behaviour 
> I see is that the script node doesn't place properly in 7.1.1 
> or 8.5. I have to copy the script node from inside the Python 
> Script Node vi, or place a matlab or xmath (or the other 
> one), then change it to python. The very first time I placed 
> the python node, it worked right. But that was the only time.

Well it seems the menu file lost the merge flag for the script
node. Editing back in the palette menu editor should fix the
behaviour.

I've attached a copy of it here. It goes in
user.lib\_dynamicpalette_dirs\OpenG            and 
user.lib\_dynamicpalette_dirs\comm

>Also, when I right-click on the node, the context menu briefly
>flashes, the matlab app flashes on the start bar, and I can't
>add an input or the like. I have to ctrl-right click, then I
>can add an input - though, oddly, the matlab app still flashes
>on the start bar.

This is strange. I can't imagine what would cause this. I don't
see this but I do not have Matlab installed.

Rolf Kalbermatter

Re: [LabPython-Users] New to group ( package for python 2.5)

[Todd L. <tl...@cy...>]

Thank you Rolf. The inline vi's and the script node works for me on 
LabVIEW 7.1.1 and 8.5 on Windows. I used the example from the labpython 
web page.

It's probably due to my setup - and it is not at all critical since I will 
be using the inline vi's - but the odd behaviour I see is that the script 
node doesn't place properly in 7.1.1 or 8.5. I have to copy the script 
node from inside the Python Script Node vi, or place a matlab or xmath (or 
the other one), then change it to python. The very first time I placed the 
python node, it worked right. But that was the only time.

Also, when I right-click on the node, the context menu briefly flashes, 
the matlab app flashes on the start bar, and I can't add an input or the 
like. I have to ctrl-right click, then I can add an input - though, oddly, 
the matlab app still flashes on the start bar.

Just a note on my application - I will be using python modules that 
communicate with an xmlrpc server. I may find out if straight tcp 
interface works better.

--Todd Lesher

Re: [LabPython-Users] New to group

[Rolf K. <r.k...@hc...>]

Hi Todd,

> There is a "File not found on server." message for that 
> attachment. Is there another place to find oglib_labpython-1.2-1.ogp?

I added a new release 1.2 to the download package for the labpython project.
Hope this works for you. There has been only limited testing done but it
seems
to work fine on my machines for at least LabVIEW 6.1 and 7.1.1 on Windows.

Rolf Kalbermatter

Re: [LabPython-Users] New to group

[Todd L. <tl...@cy...>]

Rolf,

There is a "File not found on server." message for that attachment. Is 
there another place to find oglib_labpython-1.2-1.ogp?

--Todd

Re: [LabPython-Users] New to group

[Rolf K. <r.k...@hc...>]

Hi Harry,

>I am new to this community.
>I need to use python scripts in my LabVIEW application.
>I am facing soem problem with installing python version 2.5.1.

The currenytly still downloadable OpenG package version 1.1 is an old one
that had problems with some changes in Python 2.4.3 and higher. I've updated
the shared libraries to work with current Python. However this has not made
it into a released OpenG package yet.

When you check out our mailing list archive at
http://sourceforge.net/mailarchive/forum.php?forum_name=labpython-users
you will find a discussion about this and a post by me in November with a
newer and updated LabPython OpenG package to install.

Rolf Kalbermatter

Re: [LabPython-Users] New to group

[Davide T. <da...@dt...>]

Ho visto www.Beri.it   !!!

Mi aspettavo qualche commento su Luttazzi !!!1

Davide


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[LabPython-Users] New to group

[Harish K. S. <har...@pa...>]

Hi,

I am new to this community.
I need to use python scripts in my LabVIEW application.
I am facing soem problem with installing python version 2.5.1.

Please guide me on how to go ahead with this.

Thanks & Regards,
Harry


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Re: [LabPython-Users] Python v2.5

[Ian P. <ian...@er...>]

Hi Rolf,

=20

I had a look at the contents of the zip file and discovered that the
firewall had removed the dll.

=20

Using a simple example all seems to be working fine with python v2.5.

=20

I will do some more extensive testing in the next couple of weeks.

=20

Thanks for your help

Ian

=20

________________________________

From: lab...@li...
[mailto:lab...@li...] On Behalf Of Rolf
Kalbermatter
Sent: 14 November 2007 19:53
To: 'LabPython Users Mailing List'
Subject: Re: [LabPython-Users] Python v2.5

=20

=20

Hi Ian

=20

          Main Package Name: oglib_labpython-1.2-1

	Package Name with Error: oglib_labpython-1.2-1

	Error Message: VIPM could not install the package
oglib_labpython-1.2-1 .

	Error Code: 15

	Error Source: (File "File Group 2/lvpython.dll" not found in
package) D05176DD379A1C8037BFF6EC4C40F6EC in
1A803725D0FF91C5780DDC8F737CC4BE->80DBEEE796D367A1F20720A7F185BBF0->08D2
3E9A0EB2618FD3FCE25BCDE8F285.lvlib:DBF4AEE2E95A4BEA200FF7A642ED0332->08D
23E9A0EB2618FD3FCE25BCDE8F285.lvlib:7454D3E0FBCF041E4CD97C77AADCB821->31
72DE97E266CD4EBFAC73CFCD5A02E2->VIPM Main Window.vi

	=20

	=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

	=20

	I used VIPM 1.1 Beta 2 (build 0622) and I( am running Labview
7.1.

	=20

I just tried it with VIPM 1.0 and had no problems whatsoever to install
the package.

 =20

Rolf Kalbermatter

Re: [LabPython-Users] Python v2.5

[Rolf K. <r.k...@hc...>]

 
Hi Ian
 
          Main Package Name: oglib_labpython-1.2-1

Package Name with Error: oglib_labpython-1.2-1

Error Message: VIPM could not install the package oglib_labpython-1.2-1 .

Error Code: 15

Error Source: (File "File Group 2/lvpython.dll" not found in package)
D05176DD379A1C8037BFF6EC4C40F6EC in
1A803725D0FF91C5780DDC8F737CC4BE->80DBEEE796D367A1F20720A7F185BBF0->08D23E9A
0EB2618FD3FCE25BCDE8F285.lvlib:DBF4AEE2E95A4BEA200FF7A642ED0332->08D23E9A0EB
2618FD3FCE25BCDE8F285.lvlib:7454D3E0FBCF041E4CD97C77AADCB821->3172DE97E266CD
4EBFAC73CFCD5A02E2->VIPM Main Window.vi

 

===============

 

I used VIPM 1.1 Beta 2 (build 0622) and I( am running Labview 7.1.

 

I just tried it with VIPM 1.0 and had no problems whatsoever to install the
package.

  

Rolf Kalbermatter