change the number of digits after decimal point

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jan
jan 2014-5-30
回答： rahul bathini 2015-6-26
Hi everybody
how can I change the number of digits after decimal point? I have a matrix of float numbers i want to transform each number in this matrix from this form x.xxxxxxxxxxxxxxx to this form x.xxxx
thanks

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Mahdi
Mahdi 2014-5-30
编辑：Mahdi 2014-5-30
You can use the sprintf or the format option. In your case, you can just type:
format short
into the command window.
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Mahdi
Mahdi 2014-5-30
编辑：Mahdi 2014-5-30
Try putting format short into your script? Do you mind attaching your code? It should work for your purposes.
I strongly do not recommend doing it this way, but as a last resort, you can change your string to a number using str2num.
jan
jan 2014-5-30
Thanks mehdi even it isn't a direct way but it gives what i need thanks a lot

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更多回答（2 个）

Image Analyst
Image Analyst 2014-5-30
See Azzi's answer: http://www.mathworks.com/matlabcentral/answers/57638#answer_69759
(I should add this to the FAQ.)
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jan
jan 2014-5-30
编辑：jan 2014-5-30
Hi I'm looking for b but sprintf is to transform the data to string which isn't my interest fprintf for displaying and i used format short in the command window but nothing is change. I need to transform all the values in the matrix with only 4 digits numbers and not 15 because i will do a treatement on it so it isn't a problem of displaying
Image Analyst
Image Analyst 2014-5-30
编辑：Image Analyst 2014-11-29
You said you want (b) but then you say that you don't want to use sprintf() or format() or to use a string at all. Your last sentence indicates that you want it to stay a number not a string but that is option (a) and is the answer I gave you at the very start. Sorry but I still am not sure what you want. You're either changing the number (by chopping off digits) or you're not, which is it?

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rahul bathini
rahul bathini 2015-6-26
I've made a simulation on BPSK modulation and semilogy plotted the SNR vs. BER. The plot is geometrically the same to the actual plot but deviates from BER = 0.00001.I think this is because matlab doesn't consider values below 4 decimal place while plotting , to what extent could this be the reason if not what could the reason be.plz someone help me

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