[scilab-Users] plotting marks different colors

[Maso Ricci]

Hello Mathieu,

thanks for your hints.

Yesterday I hadn't the chance to try them but this morning I added them 
to  my script and they worked fine.

Thanks again

Maso






Il 01/02/2010 15.02, Mathieu Dubois ha scritto:
> Hello Maso,
>
> To answer your question I will explain a bit of how Scilab plots objects
> (at least of how I understand that :). Sorry if you already know that.
>
> Each time you call plot2d Scilab create a "Compound" object in your plot
> (take a look at the Figure Editor : in your graphic window click on
> "Edit" and then "Figure Editor"). The "Compound" object contains a
> "Polyline" object which is your point (it can represents a full line).
> This objects has a lot of properties.
>
> To change the properties the style of each point you can use something
> like:
> for i=1:matrixlength
>
> x=matrix(1,i)
> y=matrix(2,i)
> class=matrix(3,i)
> plot2d(x , y)
>
> e=gce(); // Get a handle on the last Compound object
> point=e.children(1); // Get a handle on the polyline
> point.mark_mode="on"; // Turn on mark mode (i.e. each point is
> represented by a small symbol)
> point.mark_style=i; // Each marker is an integer (see help
> polyline_properties for a list)
>
> end
>
> Once you have the handle you can change almost anything you want.
> You may have problems with the auto scaling of the axes (see attachment
> for how to set this).
>
> One more thing: plot2d may not be the right function for you. There may
> be a simpler function to draw just a point...
>
> Hope that helps,
> Mathieu
>
> Maso Ricci wrote:
>> Mathieu,
>>
>> thanks for your reply. I wasn't so clear. I understand.
>>
>> I have a dataset resulting from a cluster analysis procedure.
>>
>> so the resultig matrix is like :
>>
>> X Y Class
>> 0.8 0.1 1
>> 0.1 0.7 2
>>
>> ...
>>
>> where the X and the Y are the data parameters and the class is the
>> class where the script allocates a datapoint.
>>
>> I plotted the entire matrix extracting one row at time. In this way I
>> have the chance to declare the variable mystyle which controls the
>> mark style.
>> Something like:
>>
>> for i=1:matrixlength
>>
>> x= matrix(1,i)
>> y=matrix(2,i)
>> class=matrix(3,i)
>>
>> mystyle=class
>>
>> plot2d(x , y , style=-mystyle)
>>
>> end
>>
>> Unfortunately the standard styles are quite similar each other so I
>> wonder I could modify the mark (size and color) at each loop
>>
>> thanks
>>
>> /maso
>>
>>
>>
>>
>> Il 01/02/2010 9.12, Mathieu Dubois ha scritto:
>>> Hello Maso,
>>>
>>> What would you like to do exactly?
>>>
>>> Do you want to plot the columns/rows of the matrix as independent curves
>>> (like plot2d does)?
>>> Or do you want to display each element of the matrix as a 2D surface
>>> (like Matplot1)?
>>>
>>> Mathieu
>>>
>>
>

-- 
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Maso RICCI PhD
Dipartimento Farmaco Chimico Tecnologico
Università degli Studi di Siena
Via Aldo Moro,2
Siena

phone: +390577234367
email: ricci2 at unisi.it
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