[scilab-Users] map from a data file

[harishankar ramachandran]

Use the "matrix" command:

// to convert gnuplot's splot data file format into a matrix
A=read("matrix-data.txt",-1,3); // or use fscanfMat
m=max(A(:,1)); // number of rows
n=max(A(:,2)); // number of cols

M=matrix(A(:,3),m,n); // Takes a matrix and reshapes it into 
// another matrix with the same number of elements, columnwise.
// So if your data is entered row-wise, I guess you have to transpose 
// the result

plot3d(1:m,1:n,M);

where the data file I used was:

1 1 0
1 2 1
1 3 2
2 1 1
2 2 2
2 3 3
3 1 2
3 2 3
3 3 4

Regards

hari ramachandran

On Tuesday 10 June 2008 16:25, Maso Ricci wrote:
> Hi all,
>
> I have a question: I have some data having the following structure
>
> 1   1  <value>
> 1   2  <value>
> 1   3  <value>
> 2   1  <value>
> 2   2  <value>
> 2   3  <value>
> 3   1  <value>
> .
> .
> .
> .
>
> well I would like to plot them like a map using the first two columns as
>   X and Y respectively and the third one as Z value.
> Of course it would be great if the Z value could determines the colour
> of the point in the map
>
> thanks for the hints

-- 
Dr. Hari Ramachandran, Professor, 332B ESB, EE Dept, IIT-Madras
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