I'm unit-testing embedded code that calculates the determinant of 4x4 matrices with elements that are 32-bit signed integers.
The method I'm using in the embedded code is the standard cofactor expansion, so the result is exact.
Per Hadamard's inequality, I'm using 160-bit signed arithmetic.
Just so I don't make the same mistake in my program that generates the unit test vectors as I do in my embedded code, is there any free software out there that will calculate large determinants?
I'll be using the GMP and a C program to generate test vectors, but I'd like an "independent" program to double-check the program that I'm using to generate the test vectors.
I've had good luck with "bc" for some large integer arithmetic test cases, but I don't believe "bc" will do matrix determinants.
Thanks, Dave Ashley