Is there a way to solve wrong results when using (mod) operation?
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Abdulatif Alabdulatif
am 20 Apr. 2014
Kommentiert: Abdulatif Alabdulatif
am 28 Apr. 2014
Hi all,
I am working with many (mod) operations to create my own functions in matlab. However, I face a problem of wrong results that are appears. For example,
***** Manuale calculations ***********
temp = (16667 * 16667 * 16667 ) = 4629907412963
temp = = 2533 * 4629907412963 = 11727555477035279
temp = temp % 25000
temp = 10279
***** Matlab calculations ***********
temp = (16667 * 16667 * 16667 )
temp = 2533 * 4.6299e+12
temp = 1.1728e+16
temp = mod (1.1728e+16 , 25000)
temp = 10280
******************************
As you can see, there are two different results even it is just one value! Also I have another
example with a huge difference between the two results.
Is there a convenient way to solve this issue?
Thanks in advance!
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Akzeptierte Antwort
Walter Roberson
am 20 Apr. 2014
You could work with int64 or uint64 datatype. That would postpone the problem.
To solve the problem (for most practical purposes) you would need to switch to a high precision arithmetic system, such as using the symbolic toolbox or using John D'Errico's File Exchange contribution "VPI"
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