#342 SegFault alter command

[Enrico Pannicke]

Hello,

I'm trying to modify he parameter of a voltage source between different transient simulations. I would like to alter the amplitude of the parameter sin. I checked the manual and tried it with alter @v1[sin] = [ 0 1 100meg ]. But every time the program is quitting with a segFault. I checked it for other parameters (f.ex. [pulse]) and it shows the same behaviour.

Below you can find a minimal example of the problem:

V1 0 1 sin(0 2 100meg)
R1 0 1 50

.end

Can you provide a solution for the problem. I compiled the latest release of ngspice.

best regards,

[Justin Fisher]

v1 0 1 dc 0 sin (0 2 100meg)
rq 0 1 50

.control
alter @v1[sin]=[ 0 1 100meg ]
tran 5p 20n
plot v(1)
.endc
.end

Note the white space inside [ ] at the beginning and end.

Kind regards,

Justin Fisher.

[Enrico Pannicke]

So it's only possible to use it inside a script?

But I would like to use it in the interactive interpreter. I'm using
sharedspice.

best regards,

On Thu, 2017-04-06 at 09:21 +0000, Justin Fisher wrote:

v1 0 1 dc 0 sin (0 2 100meg)
rq 0 1 50

.control
alter @v1[sin]=[ 0 1 100meg ]
tran 5p 20n
plot v(1)
.endc
.end

Note the white space inside [ ] at the beginning and end.
Kind regards,

Justin Fisher.

---

[bugs:#342] SegFault alter command

Status: open
Group: v1.0 (example)
Created: Thu Apr 06, 2017 08:42 AM UTC by Enrico Pannicke
Last Updated: Thu Apr 06, 2017 09:20 AM UTC
Owner: nobody

Hello,

I'm trying to modify he parameter of a voltage source between
different transient simulations. I would like to alter the amplitude
of the parameter sin. I checked the manual and tried it with alter
@v1[sin] = [ 0 1 100meg ]. But every time the program is quitting with
a segFault. I checked it for other parameters (f.ex. [pulse]) and it
shows the same behaviour.

Below you can find a minimal example of the problem:

V1 0 1 sin(0 2 100meg)
R1 0 1 50

.end

Can you provide a solution for the problem. I compiled the latest
release of ngspice.

best regards,

---

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--
M.Sc. Enrico Pannicke
Forschungscampus Stimulate

Otto-von-Guericke University Magdeburg
Chair of Electromagnetic Compatibility

Tel: +49 391 67 59365

Fax: +49 391 67 19347

Experimentelle Fabrik

Room 04.07
Sandtorstrasse 23
39106 Magdeburg
Germany

[Holger Vogt]

Enrico,

it is no problem to run the sequence interactively in ngspice. It is also no problem to enter the commands one-by-one using shared ngspice, using ng_start64.exe under Windows as offered at http://ngspice.sourceforge.net/shared.html .

To figure out what your fault might be, you have to be much more specific. What is your calling program? What is your command sequence until the segfault occurs?

Holger

[Enrico Pannicke]

Hello Holger,

I just found the mistake. I included whitespace around the =. Removing
them prevents the segmentation fault and I can alter the amplitude of
the source.

Thank you for your help.

best regards,

Enrico

On Thu, 2017-04-06 at 15:47 +0000, Holger Vogt wrote:

Enrico,

it is no problem to run the sequence interactively in ngspice. It is
also no problem to enter the commands one-by-one using shared ngspice,
using ng_start64.exe under Windows as offered at
http://ngspice.sourceforge.net/shared.html .

To figure out what your fault might be, you have to be much more
specific. What is your calling program? What is your command sequence
until the segfault occurs?

Holger

---

[bugs:#342] SegFault alter command

Status: open
Group: v1.0 (example)
Created: Thu Apr 06, 2017 08:42 AM UTC by Enrico Pannicke
Last Updated: Thu Apr 06, 2017 09:20 AM UTC
Owner: nobody

Hello,

I'm trying to modify he parameter of a voltage source between
different transient simulations. I would like to alter the amplitude
of the parameter sin. I checked the manual and tried it with alter
@v1[sin] = [ 0 1 100meg ]. But every time the program is quitting with
a segFault. I checked it for other parameters (f.ex. [pulse]) and it
shows the same behaviour.

Below you can find a minimal example of the problem:

V1 0 1 sin(0 2 100meg)
R1 0 1 50

.end

Can you provide a solution for the problem. I compiled the latest
release of ngspice.

best regards,

---

Sent from sourceforge.net because you indicated interest in
https://sourceforge.net/p/ngspice/bugs/342/

To unsubscribe from further messages, please visit
https://sourceforge.net/auth/subscriptions/

--
M.Sc. Enrico Pannicke
Forschungscampus Stimulate

Otto-von-Guericke University Magdeburg
Chair of Electromagnetic Compatibility

Tel: +49 391 67 59365

Fax: +49 391 67 19347

Experimentelle Fabrik

Room 04.07
Sandtorstrasse 23
39106 Magdeburg
Germany

[Holger Vogt]

Enrico,

thanks for the detail.
It is a nuisance not to recognize spaces around '='.

We have to take care of that.

Holger

[Justin Fisher]

Hi Holger.

If this is going to be worked on, there are a few other areas where whitespace has some strange behavior. I'm guessing there's no simple fix to that would generally fix all the issues, so maybe it's a case where we have to know where they are an issue? If that's true I can suggest the set sourcepath command in the control section. If there isn't a whitespace after the opening bracket and before the closing bracket the line isn't read.

In general it seems there are places where no whitespaces are permitted and others where they must be - which is confusing.

Using inpcom 9 in my original solution I find the following combinations work
alter @v1[sin]=[ 0 1 100meg]
alter @v1[sin] =[ 0 1 100meg]
alter @v1[sin] = [ 0 1 100meg]
alter @v1[sin] = [ 0 1 100meg ]
alter @v1[sin ]=[ 0 1 100meg]

But the following combinations do not
alter @v1[sin]=[0 1 100meg]
alter @v1[ sin]=[ 0 1 100meg]

For some reason the whitespace after "v1[" and "=[" are critical (for opposite reasons) but in this case - the rest are not.

--
Kind regards,

Justin Fisher

[marcel hendrix]

Hi Justin,

Using inpcom 9 in my original solution I find the following combinations work
 alter @v1[sin]=[ 0 1 100meg]
 alter @v1[sin] =[ 0 1 100meg]
 alter @v1[sin] = [ 0 1 100meg]   $ (a)
 alter @v1[sin] = [ 0 1 100meg ]  $ (b)
 alter @v1[sin ]=[ 0 1 100meg]

But the following combinations do not
 alter @v1[sin]=[0 1 100meg]
 alter @v1[ sin]=[ 0 1 100meg]

Your example works for me with branch scope-inpcom-11
on Windows 7, VS2017.
I note that (a) and (b) are notations that Enrico
says don't work for him.

I just found the mistake. I included whitespace 
around the =. Removing them prevents the 
segmentation fault and I can alter the amplitude 
of the source.

Enrico uses "shardspice, latest release."
I therefore assume he means ngspice-26 official release.
The bug "spaces around '=' needed" is (apparently) fixed in the
next release.

That one should write "[ 0 1 100meg ]" with spaces around
'[' and ']' is in the (current) manual:

17.5.3
...
For specifying a list of parameters as values, 
start it with ‘[’, followed by the values in 
the list, and end with ‘]’. Be sure to place 
a space between each of the values and before
and after the ‘[’ and ‘]’.

-marcel

[Holger Vogt]

There is a fix available in scope-inpcom-11.

Ngspice reacted differently, either if you used a script or (as Enrico asked for) manually entered the alter command in interactive mode.

Holger