MATLAB forces num2str to format
I'm looking for a backlink of this request
So when I type num2str(foo,3)
, I get this:
foo=0.00781
foo=0.0313
foo=0.125
foo=0.5
foo=2
foo=8
However, I want to make them the same, so something like this:
foo=0.0078
foo=0.0313
foo=0.1250
foo=0.5000
foo=2.0000
foo=8.0000
-How, can I do it with num2str
? (And I would really appreciate it if it also works if mat2str
)
Thanks for any help!
Edit:
I noticed there is one more unresolved part for this problem, which is for numbers greater than 10 or 100, 1000, etc.
So what if I want this :?
foo=000.5000
foo=002.0000
foo=008.0000
foo=032.0000
foo=128.0000
i.e. adding leading zeros to the specified length? I tried '%3.3f'
it but it doesn't work.
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For one number
You can include a C-like format specifier in num2str
:
>> num2str(.125, '%0.4f')
ans =
0.1250
Or use sprintf
:
>> sprintf('%0.4f', .125)
ans =
0.1250
For matrices
Use num2str
with matrix input. Include the required separator column (such a space) in the format specifier:
>> num2str([.125 .5; 2 8], '%0.4f ')
ans =
0.1250 0.5000
2.0000 8.0000
If you want the mat2str
-like format , you just need to process the resulting string to include ;
(or just ;
) at the end of each line and enclose it [
,]
x = [.125 .5; 2 8];
s = num2str(x, '%0.4f ');
s = [s repmat('; ', size(s,1), 1)].';
s = ['[' s(1:end-2) ']'];
In the example, this gives
>> s s = [0.1250 0.5000; 2.0000 8.0000]
Leading zeros
If you want leading zeros to reach a fixed number of characters, use the form format specifier '%08.4f'
. This means 4 decimal places, a total of 8 characters, which gives up to 3 leading zeros. For example,
x = [.125 .5; 2 8];
s = num2str(x, '%08.4f ');
s = [s repmat('; ', size(s,1), 1)].';
s = ['[' s(1:end-2) ']'];
gives
>> s s = [000.1250 000.5000; 002.0000 008.0000]
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