spalloc - Allocate space for sparse matrix
Syntax
S = spalloc(m,n,nzmax)
Description
S = spalloc(m,n,nzmax) creates
an all zero sparse matrix S of size m-by-n with
room to hold nzmax nonzeros. The matrix can then be generated
column by column without requiring repeated storage allocation as the number
of nonzeros grows.
spalloc(m,n,nzmax) is shorthand for
sparse([],[],[],m,n,nzmax)
Examples
To generate efficiently a sparse matrix that has an average of at most
three nonzero elements per column
S = spalloc(n,n,3*n);
for j = 1:n
S(:,j) = [zeros(n-3,1)' round(rand(3,1))']';end
 | soundsc | | sparse |  |
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