replace specific commas using strrep

Question

Lukas Netzer 2021-8-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/893117-replace-specific-commas-using-strrep

评论： Stephen23 2021-8-6

I converted my data:

'[[0, 145, 0], [145, 169, 1], [169, 1693, 3], [1693, 1708, 1], [1708, 2729, 3], [2729, 2779, 0]]'

using str2num.

Now I can use strrep to remove certain characters. I want to replace commas outside of the square brackets with semicolons and then remove all square brackets.

I know how to remove the brackets, but am not sure how to replace certain commas and leave the others. That's what I would use to remove the brackets:

b=strrep(data,']','');
b=strrep(data,'[','');

The final output should look like that:

'0, 145, 0; 145, 169, 1; 169, 1693, 3; 1693, 1708, 1; 1708, 2729, 3; 2729, 2779, 0'

Thank you for your help!

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Answer 1

Scott MacKenzie 2021-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/893117-replace-specific-commas-using-strrep#answer_761812

编辑：Scott MacKenzie 2021-8-5

在 MATLAB Online 中打开

In stages, to show the possibilities...

s1 = '[[0, 145, 0], [145, 169, 1], [169, 1693, 3], [1693, 1708, 1], [1708, 2729, 3], [2729, 2779, 0]]'
s1 = '[[0, 145, 0], [145, 169, 1], [169, 1693, 3], [1693, 1708, 1], [1708, 2729, 3], [2729, 2779, 0]]'
s2 = strrep(s1, '],', '];')
s2 = '[[0, 145, 0]; [145, 169, 1]; [169, 1693, 3]; [1693, 1708, 1]; [1708, 2729, 3]; [2729, 2779, 0]]'
s3 = strrep(s2, ']', '')
s3 = '[[0, 145, 0; [145, 169, 1; [169, 1693, 3; [1693, 1708, 1; [1708, 2729, 3; [2729, 2779, 0'
s4 = strrep(s3, '[', '')
s4 = '0, 145, 0; 145, 169, 1; 169, 1693, 3; 1693, 1708, 1; 1708, 2729, 3; 2729, 2779, 0'

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Lukas Netzer 2021-8-5

thank you! :)

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Answer 2

Stephen23 2021-8-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/893117-replace-specific-commas-using-strrep#answer_761887

编辑：Stephen23 2021-8-5

在 MATLAB Online 中打开

"I converted my data... using str2num."

Although your descriptiion is unclear, I guess that your goal to convert text data into numeric data. In that case, don't waste time fiddling around with strings (or for that matter, using STR2NUM which hides evil EVAL inside):

S = '[[0, 145, 0], [145, 169, 1], [169, 1693, 3], [1693, 1708, 1], [1708, 2729, 3], [2729, 2779, 0]]';
M = sscanf(S(2:end),'[%f,%f,%f], ',[3,Inf]).'
M = 6×3
           0         145           0
         145         169           1
         169        1693           3
        1693        1708           1
        1708        2729           3
        2729        2779           0

Or

M = jsondecode(S)
M = 6×3
           0         145           0
         145         169           1
         169        1693           3
        1693        1708           1
        1708        2729           3
        2729        2779           0