Convert String to Numerical Matrix

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Samuel Lee
Samuel Lee 2020-10-10
评论： Samuel Lee 2020-10-10
Hi there,
Just wondering how to convert some matrix string (such as A = '[1,2,3,4,5]') into a numerical matrix (like [1,2,3,4,5]) so that it displays when entered into matlab like,
ans =
1 2 3 4 5
instead of
Columns 1 through 5
1.0000 2.0000 3.0000 4.0000 5.0000
Cheers,
Samuel

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madhan ravi
madhan ravi 2020-10-10
编辑：madhan ravi 2020-10-10
Normally str2num() is not suggested:
Wanted = sscanf(A(2:end-1), '%d').' % edited after sir Walter’s comment to exclude []
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Walter Roberson
Walter Roberson 2020-10-10
Ran in:
A = '[1 0.2 0.4 0.5 0.6]'; sscanf(A(2:end-1), '%f')
ans = 5×1
1.0000 0.2000 0.4000 0.5000 0.6000
If the problem is that you might have commas or might not then:
A = '[1 0.2, 0.4, 0.5 0.6]'; sscanf(A(2:end-1), '%f%*[, ]')
ans = 5×1
1.0000 0.2000 0.4000 0.5000 0.6000
●
Samuel Lee
Samuel Lee 2020-10-10
Cheers Walter, this is awesome. I couldn't quite work it out from the page (https://au.mathworks.com/help/matlab/ref/sscanf.html).
Thank you!

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更多回答（1 个）

Ameer Hamza
Ameer Hamza 2020-10-10
编辑：Ameer Hamza 2020-10-10
See str2num(): https://www.mathworks.com/help/matlab/ref/str2num.html.
A = '[1,2,3,4,5]';
A = str2num(A);
Result
>> A
A =
1 2 3 4 5
Another alternative which is generally not recommended, but can be useful here
A = '[1,2,3,4,5]';
A = eval(A);

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