MATLAB Answers

how to change the digit after decimal

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Niki
Niki on 20 Aug 2015
Answered: Noam on 20 Aug 2015
I have few vectors which they have values like below
1.2 222.55 etc
matlab shows that with so many digit , I dont want, evenI tried to correct this by hand in xls which makes me tired
is there any solution to for example remove all digits until 1 or 2 or 3 or as you wish you ?
for example if my vectors which consists of 300 values, I want to do it for all of them and not one number
Thanks

Answers (2)

Walter Roberson
Walter Roberson on 20 Aug 2015
This is not actually possible in binary floating point arithmetic, because 1/10 is not exactly representable in binary. However, you can get close to it by using
digits = 3;
newvalue = round(value * 10^digits) / 10^digits;

Noam
Noam on 20 Aug 2015
Try using format:
>> format long
>> ans
ans =
1.222200000000000 1.222200000000000
>> format short
>> ans
ans =
1.2222 1.2222
>> format bank
>> ans
ans =
1.22 1.22
>> format shortG
>> ans
ans =
1.2222 1.2222
>> format rat
>> ans
ans =
6111/5000 6111/5000

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