Why does NUM2STR function not honor the default format "%11.4g" in case of large numbers in MATLAB 7.0.4 (R14SP2)?
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When I invoke NUM2STR for very large numbers it does not honor the default format which is "%11.4g". Here is the code to reproduce this issue:
x =1e20/3;
num2str(x)
This produces an output:
33333333333333332000
where as the output should be
3.33e+19
Accepted Answer
MathWorks Support Team
on 27 Jun 2009
This is an omission in the MATLAB 7.0.4 (R14SP2) documentation for NUM2STR. The documentation should read as follows:
" If the input array is integer-valued, NUM2STR returns the exact string
representation of that integer. The term integer-valued includes large
floating-point numbers that lose precision due to limitations of the hardware"
This has been corrected in the documentation.
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