I/O is contained within the m1ri_io. At this point printing to ascii text is finished. Within the next week, input files for matrices will become a feature. Libpng, is optional, being less portable and is detected by autotools before functions relying upon it are used.
Permutation matrices are rather important and interesting. Using lapack style permutation matrices, they consist of an array where the array index and the respective value stored at index represent a row/column to be swapped. These will serve a major purpose later, being part of PLE decomposition, improving performance when working with sparse matrices.
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