I've run a simple python command and it derives the following result. Can anyone tell me why?
a=[[0.12,0.35],[0.66,0.79]]
b=[[10*i,10*j] for i,j in a]
and I got the following result:
b=[[1.2, 3.5], [6.6000000000000005, 7.9]]
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2What about the output do you not understand? – TheQAGuy Mar 13 '17 at 17:56
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1https://docs.python.org/3/tutorial/floatingpoint.html – anupsabraham Mar 13 '17 at 17:58
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can you add to your question details about what you expected to get? – Mohammad Athar Mar 13 '17 at 18:00
1 Answers
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This is simple representation "error". Binary numbers do not represent decimal values with prefect accuracy, any more than a terminating decimal can accurately represent, say, 1/7.
0.66 is a decimal whose binary representation is just a hair high (actually, they're all going to be a little "off", but this is the only one that shows at a factor of only 10). You can "fix" this by switching to a decimal data type.
Prune
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