de2bi not working for large decimal number

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MAURIZIO MURATORI
MAURIZIO MURATORI 2019-10-16
编辑： Stephen23 2019-10-16
I have a problem with de2bi. Just typing de2bi(bi2de(ones(1,56))) I should trivially obtain ones(1,56), but I obtain a row of 56 zeros and a one. Why is that?

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Stephen23
Stephen23 2019-10-16
编辑：Stephen23 2019-10-16
"Why is that?"
Because those functions use double class, and your value is well above flintmax:
>> 2^53 % flintmax
ans = 9.0072e+015
>> bi2de(ones(1,56)) % your value
ans = 7.2058e+016
See also:
https://www.mathworks.com/matlabcentral/answers/76623-maximum-decimal-and-binary-values

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