I needed a tool that would generate all simple pairs of factors of a positive integer N, where N could be rather large. I also needed this task to be accomplished efficiently. So while I liked the nfactork submission that Matt Fig has posted, I found it to have severe problems with memory for some numbers. Therefore I had to write my own tool for the task that handles the case where exactly two factors are generated.
The factorpairs function is quite efficient for large N with many factors. It works for any value of N that does not exceed 2^32.
F = factorpairs(factorial(12));
Elapsed time is 0.003767 seconds.
There are 396 distinct pairs of factors generated here.
John D'Errico (2022). factorpairs (https://www.mathworks.com/matlabcentral/fileexchange/27113-factorpairs), MATLAB Central File Exchange. Retrieved .
MATLAB Release Compatibility
Platform CompatibilityWindows macOS Linux
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!Start Hunting!