Precision issue when comparing matlab output with c code output

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Vaishnavi
Vaishnavi 2025-3-26
评论： Walter Roberson 2025-3-26

I am trying to compare my c code output with matlab output. My results are matching up to 18th decimal points. When both matlab and c compiler uses ieee754 floating point format. Then why am I observing the difference. As matlab by default uses double precision, my c code is also using double data type.

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dpb
dpb 2025-3-26
If identical past the 15-16 digits of DP, though? That's what makes this one hard to figure...OP says agree precisely to 18 decimal places?
Walter Roberson
Walter Roberson 2025-3-26
Ran in:
"18 decimal points" is not necessary the same as 18 digits of precision. For example,
A = 0.0000000000123456789478;
fprintf('%.19f\n', A)
0.0000000000123456789
might seem to be valid to 19 decimal places, if you count starting from the period.

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