'Re: [Scilab-users] {EXT} Sgrayplot/champ for non-regular grids'

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List:       scilab-users
Subject:    Re: [Scilab-users] {EXT} Sgrayplot/champ for non-regular grids
From:       Federico Miyara <fmiyara () fceia ! unr ! edu ! ar>
Date:       2019-04-16 21:14:30
Message-ID: fbd49909-84e8-e6aa-8368-1f43e538eb85 () fceia ! unr ! edu ! ar
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What about cshep2d and eval_cshep2d?

This seems not to need grided dta.

Federico Miyara

On 16/04/2019 14:33, philippe wrote:
> Le 16/04/2019 Ă  16:16, Dang Ngoc Chan, Christophe a ĂŠcrit :
>> Just a quick idea:
>> have you considered using interp2d()
> at first look yes but interp2d() use the output of spline2d(x,y,z) where
> x and y should be vectors which is a "regular grid" .... After a
> Joukowski transform the regular grid is transformed like this :
>
> https://photos.app.goo.gl/1rqWtyhYUCaofrme6
>
>
>> or linear_interpn() to get values on a regular grid?
> looks like I search for the reverse function !
>
> tanks for your reply,
> Philippe
>
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    <br>
    <font face="Courier New">What about cshep2d and eval_cshep2d?<br>
      <br>
      This seems not to need grided dta.<br>
      <br>
      Federico Miyara<br>
      <br>
      <br>
    </font>
    <div class="moz-cite-prefix">On 16/04/2019 14:33, philippe wrote:<br>
    </div>
    <blockquote cite="mid:q953ko$7a43$1@blaine.gmane.org" type="cite">
      <pre wrap="">Le 16/04/2019 Ă  16:16, Dang Ngoc Chan, Christophe a ĂŠcrit  :
</pre>
      <blockquote type="cite">
        <pre wrap="">
Just a quick idea:
have you considered using interp2d() 
</pre>
      </blockquote>
      <pre wrap="">
at first look yes but interp2d() use the output of spline2d(x,y,z) where
x and y should be vectors which is a "regular grid" .... After a
Joukowski transform the regular grid is transformed like this :

<a class="moz-txt-link-freetext" \
href="https://photos.app.goo.gl/1rqWtyhYUCaofrme6">https://photos.app.goo.gl/1rqWtyhYUCaofrme6</a>

</pre>
      <blockquote type="cite">
        <pre wrap="">or linear_interpn() to get values on a regular grid?
</pre>
      </blockquote>
      <pre wrap="">
looks like I search for the reverse function !

tanks for your reply,
Philippe

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