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FORTRAN POPPAR Equivalent in Matlab

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Juan Navarro
Juan Navarro 2021-7-9
编辑： Juan Navarro 2021-7-9
Hello Matlab comunity, my question is what would be the equivalent to FORTRAN POPPAR function in Matlab?
According to gnc webpage, POPPAR(I) returns parity of the integer I, i.e. the parity of the number of bits set ('1' bits) in the binary representation of I. It is equal to 0 if I has an even number of bits set, and 1 for an odd number of '1' bits.
Thank you!

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采纳的回答

John D'Errico
John D'Errico 2021-7-9
The obvious answer is the simple answer...
sum(dec2bin(I) - '0')

更多回答（1 个）

Walter Roberson
Walter Roberson 2021-7-9
Ran in:
bitget() can be faster.
I = randi([0 2^32-1], 1, 1, 'uint32')
I = uint32 1734766993
timeit(@() mod(nnz(dec2bin(I)-'0'),2),0)
ans = 1.1998e-04
timeit(@() fold(@xor, dec2bin(I) - '0', 0), 0)
ans = 5.8975e-05
timeit(@() fold(@xor, bitget(I, 1:32), 0), 0)
ans = 3.8923e-05
timeit(@() mod(sum(bitget(I,1:32)),2),0)
ans = 3.4225e-06

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