Re: [Matplotlib-users] Matplotlib-users Digest, Vol 102, Issue 39

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@MariaLukis, I had to go through contortions to plot an arbitrary
quadrilateral mesh, in 3D. I resolved it by storing every line plotted and
retracing the best set to take me to the starting point of the quad I was
plotting. It would have been much easier if I had the function of lifting
my pen and move while not plotting. But then I did not know how to get
intpo matplotlib to perform what is a simple mod.

On Fri, Nov 21, 2014 at 6:54 AM, <
mat...@li...> wrote:

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> Today's Topics:
>
>    1. How to plot other than rectangular grid? (Maria Liukis)
>    2. Re: How to plot other than rectangular grid? (Thomas Caswell)
>    3. Re: How to plot other than rectangular grid?
>       (Shahar Shani Kadmiel)
>    4. Re: How to plot other than rectangular grid? (Oliver)
>    5. Re: How to plot other than rectangular grid? (Eric Firing)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 21 Nov 2014 00:11:31 +0000
> From: Maria Liukis <li...@us...>
> Subject: [Matplotlib-users] How to plot other than rectangular grid?
> To: "mat...@li..."
>         <mat...@li...>
> Message-ID: <503...@us...>
> Content-Type: text/plain; charset="Windows-1252"
>
> Hello,
>
> I have a problem plotting data which is defined on a grid other than
> rectangular mesh, and would greatly appreciate any advise. My data is
> defined for 0.1degree grid for the state of California, and I don?t want to
> interpolate my data outside of the defined grid when plotting it. I used
> pcolormesh() function for rectangular area maps, but it only accepts
> rectangular grid and I was wondering if there is a simple solution to my
> problem.
>
> The only solution I could find was to use scipy.interpolate,griddata() to
> ?map? my grid to a bounding rectangular grid (bounding rectangle around CA
> state), but that would also interpolate my data to grid cells outside of CA
> state, which I don?t want to do.
>
> Many thanks for any hints!
> Masha
> --
> li...@us...
>
>
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Fri, 21 Nov 2014 04:38:21 +0000
> From: Thomas Caswell <tca...@gm...>
> Subject: Re: [Matplotlib-users] How to plot other than rectangular
>         grid?
> To: Maria Liukis <li...@us...>,
>         "mat...@li..."
>         <mat...@li...>
> Message-ID:
>         <CAA48SF86omwetH6jxKDbqo++TW=
> JUw...@ma...>
> Content-Type: text/plain; charset="utf-8"
>
> There are also triangular mesh plotting (I think tricolormesh is the
> function name).
>
> The really brute force solution is to use poly collection and draw what
> ever shape you want.
>
> Tom
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> ------------------------------
>
> Message: 3
> Date: Fri, 21 Nov 2014 00:15:58 -0800 (PST)
> From: "Shahar Shani Kadmiel" <ka...@po...>
> Subject: Re: [Matplotlib-users] How to plot other than rectangular
>         grid?
> To: "Maria Liukis" <li...@us...>
> Cc: mat...@li...
> Message-ID: <1416557758097.b2298d67@Nodemailer>
> Content-Type: text/plain; charset="utf-8"
>
> When using scipy.interpolate.griddada, you could use 'nearest' if your
> data is sufficiently dense. This will 'map' your grid onto whatever
> rectangular grid leaving grid points outside the convex hull of the
> original grid empty. Well, not empty but nan.?If you do wish to interpolate
> your dada, you could mask the resulting rectangular grid post
> interpolation.?
>
>
> ?
> Sent from Mailbox
>
> On Fri, Nov 21, 2014 at 2:12 AM, Maria Liukis <li...@us...> wrote:
>
> > Hello,
> > I have a problem plotting data which is defined on a grid other than
> rectangular mesh, and would greatly appreciate any advise. My data is
> defined for 0.1degree grid for the state of California, and I don?t want to
> interpolate my data outside of the defined grid when plotting it. I used
> pcolormesh() function for rectangular area maps, but it only accepts
> rectangular grid and I was wondering if there is a simple solution to my
> problem.
> > The only solution I could find was to use scipy.interpolate,griddata()
> to ?map? my grid to a bounding rectangular grid (bounding rectangle around
> CA state), but that would also interpolate my data to grid cells outside of
> CA state, which I don?t want to do.
> > Many thanks for any hints!
> > Masha
> > --
> > li...@us...
> >
> ------------------------------------------------------------------------------
> > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
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> ------------------------------
>
> Message: 4
> Date: Fri, 21 Nov 2014 14:13:03 +0100
> From: Oliver <oli...@gm...>
> Subject: Re: [Matplotlib-users] How to plot other than rectangular
>         grid?
> To: Shahar Shani Kadmiel <ka...@po...>
> Cc: "mat...@li..."
>         <mat...@li...>
> Message-ID:
>         <CAEqQaNBqU4dDxQD0PTQXh=
> J23...@ma...>
> Content-Type: text/plain; charset="utf-8"
>
> As Thomas Caswell said, check out the "tri..." functions. No need for
> interpolation. This question recently reappeared on Stackoverflow and was
> answered there as well:
>
> https://stackoverflow.com/questions/27004422/contour-imshow-plot-for-irregular-x-y-z-data
>
> 2014-11-21 9:15 GMT+01:00 Shahar Shani Kadmiel <ka...@po...>:
>
> > When using scipy.interpolate.griddada, you could use 'nearest' if your
> > data is sufficiently dense. This will 'map' your grid onto whatever
> > rectangular grid leaving grid points outside the convex hull of the
> > original grid empty. Well, not empty but nan.
> > If you do wish to interpolate your dada, you could mask the resulting
> > rectangular grid post interpolation.
> >
> > ?
> > Sent from Mailbox <https://www.dropbox.com/mailbox>
> >
> >
> > On Fri, Nov 21, 2014 at 2:12 AM, Maria Liukis <li...@us...> wrote:
> >
> >> Hello,
> >>
> >> I have a problem plotting data which is defined on a grid other than
> >> rectangular mesh, and would greatly appreciate any advise. My data is
> >> defined for 0.1degree grid for the state of California, and I don?t
> want to
> >> interpolate my data outside of the defined grid when plotting it. I used
> >> pcolormesh() function for rectangular area maps, but it only accepts
> >> rectangular grid and I was wondering if there is a simple solution to my
> >> problem.
> >>
> >> The only solution I could find was to use scipy.interpolate,griddata()
> to
> >> ?map? my grid to a bounding rectangular grid (bounding rectangle around
> CA
> >> state), but that would also interpolate my data to grid cells outside
> of CA
> >> state, which I don?t want to do.
> >>
> >> Many thanks for any hints!
> >> Masha
> >> --
> >> li...@us...
> >>
> >>
> >>
> >>
> >>
> ------------------------------------------------------------------------------
> >>
> >> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
> >> from Actuate! Instantly Supercharge Your Business Reports and Dashboards
> >> with Interactivity, Sharing, Native Excel Exports, App Integration &
> more
> >> Get technology previously reserved for billion-dollar corporations, FREE
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> >>
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> >> _______________________________________________
> >> Matplotlib-users mailing list
> >> Mat...@li...
> >> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
> >>
> >
> >
> >
> >
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> Message: 5
> Date: Fri, 21 Nov 2014 09:54:29 -0500
> From: Eric Firing <ef...@ha...>
> Subject: Re: [Matplotlib-users] How to plot other than rectangular
>         grid?
> To: mat...@li...
> Message-ID: <546...@ha...>
> Content-Type: text/plain; charset=windows-1252; format=flowed
>
> On 2014/11/20, 7:11 PM, Maria Liukis wrote:
> > Hello,
> >
> > I have a problem plotting data which is defined on a grid other than
> > rectangular mesh, and would greatly appreciate any advise. My data is
> > defined for 0.1degree grid for the state of California, and I don?t
> > want to interpolate my data outside of the defined grid when plotting
> > it. I used pcolormesh() function for rectangular area maps, but it
> > only accepts rectangular grid and I was wondering if there is a
> > simple solution to my problem.
>
> Masha,
>
> When you say your data "is defined for a 0.1 degree grid", that makes it
> sound like it is on a quadrilateral grid, so there should be no problem
> with using pcolormesh.  Is it on 0.1 degree lon by 0.1 degree lat
> points, but only for points within California?  Then you can make a
> masked array with this grid for a rectangle in which the points outside
> California are masked, and the ones inside are set to your data values.
>   Your X and Y inputs to pcolormesh should be 2-D arrays with the
> boundary values rather than the centers.  It sounds like you would want
> to do all this via mpl_toolkits.basemap.Basemap so that you will end up
> with a properly proportioned and labeled map.
>
> Maybe I am misinterpreting your description of your data, however.
>
> Eric
>
> >
> > The only solution I could find was to use
> > scipy.interpolate,griddata() to ?map? my grid to a bounding
> > rectangular grid (bounding rectangle around CA state), but that would
> > also interpolate my data to grid cells outside of CA state, which I
> > don?t want to do.
> >
> > Many thanks for any hints! Masha -- li...@us...
> >
> >
> >
>
> >
> ------------------------------------------------------------------------------
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> > from Actuate! Instantly Supercharge Your Business Reports and Dashboards
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>
>
>
>
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> End of Matplotlib-users Digest, Vol 102, Issue 39
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