Matrix operations

• abs — absolute value, magnitude
• cross — vector cross product
• cumprod — cumulative product of array elements
• cumsum — cumulative sum of array elements
• kron — Kronecker product (.*.)
• max — maximum
• min — minimum
• norm — matrix norm
• prod — product of array elements
• signm — matrix signum function
• sum — sum of array elements
• tril — lower triangular part of matrix
• triu — upper triangle