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num2str(12​3456789012​3456789) returns '1234567890123456768'

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abhinibesh
abhinibesh 2017-3-18
回答： Jan 2017-3-18
Please help: command num2str(1234567890123456789) on matlab returns '1234567890123456768'...seems to be some overflow error, as last two digits have got changes from 89 to 68.

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Jan
Jan 2017-3-18
Exactly. Matlab stores the values in the IEEE754 format, which use about 16 digits. This is the standard format for floating point numbers, such that this is not a problem of Matlab but a general decision for numerical software.
See https://www.mathworks.com/help/symbolic/vpa.html for using number with more digits.

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