MATLAB: Sparse Matrix Error

sparse

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!

Best Answer

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.
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