SAREK - Sparse Analyzer Real Et Komplex

The SAREK function analyzes a sparse matrix for integrity. Useful especially for checking sparse matrices built by 3rd party s/w.

The sarek function analyzes a sparse matrix for integrity. Patterned after the original spok function by Tim Davis. Requires a C compiler to compile the C source code sarek.c into a mex routine. Should work for both R2017b- and R2018a+ MATLAB versions, but I am only able to test the R2018a+ version currently. Let me know if you find any issues. Self building.

Syntax:

bad = sarek(s)

Where s = A sparse matrix (real or complex, double or logical)

bad = Number of errors found

Checks for the following errors:

M < 0

N < 0

Nzmax < 1

Jc = NULL

Jc[0] ~= 0

Jc[N] > Nzmax

(M==0 || N==0) && Jc[N] ~= 0

Jc[j] < Jc[j-1]

Ir == NULL && Jc[N] > 0

Jc[j] > Nzmax

Ir[i] < 0 || Ir[i] >= M

Ir[i] <= Ir[i-1]

Pr == NULL && Jc[N] > 0

Pi == NULL && Jc[N] > 0

Pr[i] = 0 for real or logical matrices

Pr[i] = 0 && Pi[i] == 0 for complex matrices