[Octave-bug-tracker] [bug #36133] num2str displays more than 16 significant digits for large integer inputs

[Andrew Janke]

Follow-up Comment #12, bug #36133 (project octave):

Matlab's behavior has changed since R2014b. Here's examples from R2018a:


>> sprintf ('%30.0f', 1e25)
ans =
    '    10000000000000000905969664'



>> num2str(2^512)
ans =
    '1.34078079299426e+154'
>> sprintf ('%.0f', 2^512)
ans =
   
'13407807929942597099574024998205846127479365820592393377723561443721764030073546976801874298166903427690031858186486050853753882811946569946433649006084096'


>> for i = 1:25; x = 10^i; disp (num2str (x)); end
10
100
1000
10000
100000
1000000
10000000
100000000
1000000000
10000000000
100000000000
1000000000000
10000000000000
100000000000000
1000000000000000
1e+16
1e+17
1e+18
1e+19
1e+20
1e+21
1e+22
9.999999999999999e+22
1e+24
1e+25



>> num2str ([2.1, 1e23, pi])
ans =
    '2.1  9.999999999999999e+22      3.141592653589793'


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