# Data matrices

• Both matrices $$A$$ and $$P$$ must be in Compressed Sparse Column (CSC) format using zero-based indexing.

• The order of the rows of $$A$$ must be in the order that the cones appear in the cones table.

• The rows of $$A$$ corresponding to semidefinite cones (as well as the rows of $$b$$) must be handled carefully, as described in Semidefinite cones.

• The matrix $$P$$ must be symmetric positive semidefinite and only the upper triangular part of $$P$$ should be passed in.

• If $$P = 0$$ for your problem then you can set the P entry to NULL in the Data struct. $$A$$ must always be non-NULL.

See the ScsMatrix struct for the concrete implementation in the C api.