Question: using the spare storage option for matrix

I have defined a sparse matrix and verified that it is space by using the command- sparsematrixplot(Kd,'matrixview');

first, is there another way to check wether the matrix is stored in the sparse form?

second, when trying to sovle an algebraic set of equation using the procedures for hendling the sparse matrix i encountered the following error:

Error, (in HWcall[1]) column vector dimension less than length of sparse data
 

what is the meaning of this error and how can I repair it?

Dvir
 

 

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