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convert numbers that contain the scientific notation e to the long format then round it to the fourth decimal?

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Sarah A
Sarah A on 21 Jul 2019
Edited: Guillaume on 21 Jul 2019
Hello,
suppose that we have a matrix A (2*3) that contains the values:
A= [ 0.0037 0.0089 0.0057
0.0041 0.-3.000000000000000e-04 0.0034]
I need to make the elment A(2,2) to this form (-0.0003) , where A becomes:
A= [ 0.0037 0.0089 0.0057
0.0041 -0.0003 0.0034]
So, how can I do this?
Regards,

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Answers (1)

Guillaume
Guillaume on 21 Jul 2019
Edited: Guillaume on 21 Jul 2019
I assume that what you mean is that you'd like matlab to display numbers as -0.0003 instead of 3e-4. If so,
format shortg
will change the display to avoid scientific notation as much as possible.
If instead you're saying you want to store -0.0003 instead of 3e-4,. that makes no sense, they're the same numbers (and are stored internally in a completely different format). Furthermore, due to the way numbers are stored on a computer, it's actually impossible to store -0.0003 exactly (in ieee754 representation such as double or single). The actual number that is stored in memory is actually -0.0002999999999999999737189393389513725196593441069126129150390625, the nearest representable number to -0.0003. Any program will round that to -0.0003 for display.

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