sparse nzmax replaced by nnz by matio ?

[Nelson-numerical-software]

S = sparse(1:10,1:10,5,20,20,100);
nzmax(S)
save('bug_nzmax.mat','S','-v7.3')

loaded by matio:

mat_sparse_t* sparseData = (mat_sparse_t*)matVariable->data;
indexType nzmax = (indexType)sparseData->nzmax;

nzmax from matio is equal to 10 and not 100 as expected.

Same problem when we save with matio and load after

[tbeu]

Confirmed (only with v7.3), see https://github.com/tbeu/matio/blob/2c20d2178017b3eb13ab160cef239648f9915bdb/src/mat73.c#L2455-L2456 Can you please attach the MAT-file here.

[tbeu]

nzmax is not stored in the v7.3 MAT file, thus impossible to consider it correctly.