how to optimize a diag matrix with sparse

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Dimitrios
Dimitrios 2014-6-5
回答： James Tursa 2014-6-5
How to optimize this diagonal matrix using sparse :
a=diag([-ones(9,1)],-1)+diag([ones(10,1)])+diag([0 ones(1,4) 0],4)

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James Tursa
James Tursa 2014-6-5
If you mean how to create the equivalent sparse matrix to your full matrix shown, try using the spdiags function instead of diag.

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