Cannot subtract number of order smaller then e-4 from variable

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Dominik Stolfa
Dominik Stolfa 2024-11-26
评论： Dominik Stolfa 2024-11-26

a=0.1; a=a-1e-5 gives result a=0.1000

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Torsten
Torsten 2024-11-26
编辑：Torsten 2024-11-26
Ran in:
It's just a question of how the numbers are displayed.
Internally, the precision of computing is much higher.
format long % Use display format long
a = 0.1;
a = a - 1e-5
a =
0.099990000000000
format short
a
a = 0.1000
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Walter Roberson
Walter Roberson 2024-11-26
编辑：Walter Roberson 2024-11-26
Ran in:
format long % Use display format long
a = 0.1;
fprintf('%.999g\n', a)
0.1000000000000000055511151231257827021181583404541015625
a = a - 1e-5
a =
0.099990000000000
fprintf('%.999g\n', a)
0.09999000000000000942801392511682934127748012542724609375
Dominik Stolfa
Dominik Stolfa 2024-11-26
Thank you for nice example. I was confused before whether the Matlab changes the values at all because even after subtracting 6e-5 or so, the values were still same. I didn’t go past up to 9e-5 because I was like “what are the chances”. :D

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