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factor2.m

19 May 2004 (Updated 26 May 2004)

factor2(n) returns the prime factorization of n as a k by 2 matrix.

File Information
Description	Given a nonnegative integer n, factor2(n) returns the prime factorization of n as a 2 by k matrix, with the k distinct prime factors in the left column and exponents in the right column.
MATLAB release	MATLAB 6.0 (R12)

Tags for This File
Everyone's Tags	divisor, factor, mathematics, prime factorization, symbolic math
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Comments and Ratings (3)
25 May 2004	Jos vdG	or use Matlab: F = factor(A) ; X(:,1) = unique(F(:)') ; X(:,2) = hist(F,X(:,1)) ;
25 May 2004	Jos vdG	Sorry, small mistake in row/columns F = factor(A) ; X(1,:) = unique(F(:)') ; X(2,:) = hist(F,X(:,1)) ;
15 May 2006	Not Happy Jan	Relying on factor() means you restrict yourself to numbers less than 2^32

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Updates
26 May 2004	I modified this program so that it sorts the prime factors by columns instead of by rows, allowing for more convenience, especially with large numbers. I also modified it so it now works with negative numbers as well.