Truncating fractions

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Raviteja
Raviteja 2011-4-7
If A I have like this
>> A=[0.0001 -0.0012 1.0005 0.0040 1.4125]
A =
0.0001 -0.0012 1.0005 0.0040 1.4125
I want to have A values like this
0.00 0.00 1.00 0.00 1.41
How to do in MATLAB ?

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采纳的回答

Matt Fig
Matt Fig 2011-4-7
Ar = round(A*100)/100
.
.
.
EDIT
Raviteja, the above command does store your values as you want. The problem is not with the values, but with how the values are displayed in MATLAB. You cannot make MATLAB display the values in just any way you want. The closest you can get is:
format bank
Ar = round(A*100)/100
Ab = abs(A) %This looks like what you want, but the full value is there.
  2 个评论
Raviteja
Raviteja 2011-4-7
>> Ar=round(A*100)/100
Ar =
0 0 1.0000 0 1.4100
Matt Fig
Matt Fig 2011-4-7
It looks like it is working to me. Did you mean that you want to print out the array? That is a different question.
sprintf('%3.2f ',abs(A.'))

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更多回答（2 个）

Oleg Komarov
Oleg Komarov 2011-4-7
Matt's solution is working. Your question isn't specific enough. You want to display, and not to truncate.
A=[0.0001 -0.0012 1.0005 0.0040 1.4125]
sprintf('%4.2f ',A)
Oleg
  2 个评论
Raviteja
Raviteja 2011-4-7
I dont need display, I want to make values only like this
0.00 0.00 1.00 0.00 1.41
more over if I want to store
Ar=sprintf('%4.2f ',A);
It making Ar as char.
This is not what I want.
I need "double" values which exactly comes like
A=
0.00 0.00 1.00 0.00 1.41
Walter Roberson
Walter Roberson 2011-4-7
Raviteja, it is impossible for binary value representation in *any* programming language to store 1.41 _exactly_.

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Walter Roberson
Walter Roberson 2011-4-7
What you would like to do cannot be done in any finite binary number representation system. 1/10 is an infinitely repeating number in binary, just the same way that 1/7 is an infinitely repeating number in decimal.
You can represent A to two decimal places as character strings for display purposes, but you will not be able to truncate to two decimal places numerically in binary.
>> sprintf('%.53g', 1.41)
ans =
1.4099999999999999200639422269887290894985198974609375

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