how to change the digit after decimal

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Niki
Niki 2015-8-20
回答： Noam 2015-8-20
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

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回答（2 个）

Walter Roberson
Walter Roberson 2015-8-20
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 2015-8-20
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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