MATLAB: Bitset error for uint64

bitset uint64MATLAB

There seems to be a problem with the bitset function for uint64. Here is a simple example:
>> d = 38124631952277504;
>> dec2bin(d)
ans =
'10000111011100100010011010011000101101010100000000000000'
>> dec2bin(d+1)
ans =
'10000111011100100010011010011000101101010100000000000000'
>> dec2bin(bitset(d,1,'uint64'))
ans =
'10000111011100100010011010011000101101010100000000000000'
>> dec2bin(bitset(d,2,'uint64'))
ans =
'10000111011100100010011010011000101101010100000000000000'
>> dec2bin(bitset(d,3,'uint64'))
ans =
'10000111011100100010011010011000101101010100000000000000'
>> dec2bin(bitset(d,4,'uint64'))
ans =
'10000111011100100010011010011000101101010100000000001000'
>> dec2bin(d+8)
ans =
'10000111011100100010011010011000101101010100000000001000'
So the bits only change successfully from 4th bit on, but fail to set fo the first three bits. This makes no sense that I can see and seems to be a serious error in Matlab.
Any help would be appreciated. Or advice on how to alert Matlab engineers.
Thanks,
Jason

Best Answer

  • Read the documentation of dec2bin, it is written that if number is greater than flintmax then it might not work properly. In your case d is greater than flintmax.