Sparse Matrix Error

2012 5 21
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I've been trying to create a matrix using the sparse matrix command:
M=sparse(IndR,IndC,KP,S,S,4);
Where IndR, IndC and KP are vectors of size (4*S) times 1. S is about 700,000.
I get the following error when running the command:
??? Error using ==> sparse Index exceeds matrix dimensions.
I double checked and IndR and IndC only take values in the range 1:1:S. Any clues of what might be going on? Thanks!

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John D'Errico
John D'Errico 2012-5-21

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Read the help for sparse. What is that last argument? What does it say about nzmax?
For example, compare these two test cases:
>> sparse(1:5,1:5,1,5,5)
ans =
(1,1) 1
(2,2) 1
(3,3) 1
(4,4) 1
(5,5) 1
>> sparse(1:5,1:5,1,5,5,4)
Error using sparse
Index exceeds matrix dimensions.

更多回答（1 个）

GeoM
GeoM 2012-5-21

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Thanks John. Your example guided me to find the mistake. I was thinking of nzmax as the number of non-zeros in a row. It is the number of non-zeros in the whole matrix.

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