equivalent of Matlab "spy" command

[Yann Hervé De Roeck]

Matlab spy command displays the pattern of sparse matrices.
Is there any equivalent in Scilab ?

Thank you all in advance,

Yann-Hervé De Roeck.

[Matthieu Philippe]

Try this function made by S. STEER

function spy(S)
[nargout,nargin] = argn(0)
//SPY Visualize sparsity pattern.
// SPY(S) plots the sparsity pattern of the matrix S.
// S. STEER

if S==[] then S=0,end
[m,n] = size(S);
stx=max(1,10^(int(log10(m))))

rect=[0 0 m+1 n+1]

[i,j] = find(S);i = i(:);j = j(:);

xbasc();plot2d(0,0,-1,'051',' ',rect,[1 m+1,1 n+1])

plot2d(j,i,-1,'000')
xtitle('nz = '+string(nnz(S)),' ',' ');

Hope that helps
Scilab Jr

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