[scilab-Users] Plotting matrix

[Mathieu Dubois]

Hello,

Thanks to Samuel I have a working function (see attachment). To plot 
arbitrary values the function first scales them in [0,1] so very low 
values are represented with small circles and colours from the bottom of 
the colormap and high values with circles of diameter close to 1 (and 
colours from the top of the colormap). The parameter threshold is used 
to represent very low values (in the current version this introduces a 
slight bias).

The function works reasonably well but to be complete:
  - the parameter threshold (which specify what to do with very low 
values) should be optional
  - the user should be able to give the scaling parameters (for instance 
to represent sevral matrices with the same colorscale)
I will find time to do that.

The function is named Matplot2 because it's like Matplot and Matplot1. 
It would be nice to include it into scilab... I can fill a request on 
bugzilla...

By the way I have seen that scilab supports named parameters but I 
didn't find documentation/examples. My question:
  - how can I use named parameters?
  - can I set a default value for a named parameter?
This would be a nice alternative to varargin...

Mathieu

On 10/15/2010 10:55 AM, Mathieu Dubois wrote:
> On 10/15/2010 09:31 AM, Samuel GOUGEON wrote:
>>  Hello Mathieu,
>>
>> ----- Message d'origine -----
>> De : Mathieu Dubois
>> Date : 14/10/2010 21:02:
>>> Hello,
>>>
>>> I would like to represent data in a matrix by coloured small circles 
>>> (for gnuplot users I want to reproduce something like the "with 
>>> points" option).
>>>
>>>
>>> The following script works but is rather slow. axis is a handle the 
>>> axes and h a handle to the figure (it is hidden before the script 
>>> and then reshowed to speed up the rendering).
>>> The data are probabilities so the scaling is simple. The circles are 
>>> approximated by 10 facets polygons which is not very beautiful. The 
>>> probability gives the radius of the circle and its colour.
>> Why not using
>>
>> drawlater
>> //... loop (if really needed. Is it?)
>> xfarcs(...)
>> // ... end of loop
>> drawnow
>>
>> ?
>>
>>
> Thanks for your suggestion! I'm working on it (and it looks 
> promising). I will sent it to the list...
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