Sparse Matrix Error

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!

Answer 1

[John D'Errico]

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.

Answer 2

[GeoM]

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.