How to extract numeric values from char

Question

Yuzhen Lu 2020-1-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/501967-how-to-extract-numeric-values-from-char

评论： Yuzhen Lu 2020-1-25

采纳的回答： Stephen23

I have 9*1 column cell C. Here is the contents:

{'{"name":"rect","x":101,"y":30,"width":239,"height":244}'}

{'{"name":"rect","x":503,"y":88,"width":124,"height":165}'}

{'{"name":"rect","x":123,"y":78,"width":93,"height":111}' }

{'{"name":"rect","x":386,"y":47,"width":105,"height":112}'}

{'{"name":"rect","x":582,"y":40,"width":100,"height":113}'}

{'{"name":"rect","x":169,"y":50,"width":187,"height":209}'}

{'{"name":"rect","x":563,"y":49,"width":131,"height":181}'}

{'{"name":"rect","x":414,"y":128,"width":47,"height":53}' }

{'{"name":"rect","x":315,"y":131,"width":26,"height":33}' }

Each cell reprsents a rectangular bounding box defineds by its top-left corner coordinate and width and height. Then I want to extract from the 9*1 cell array these bounding box information (x, y, w, h) into a numeric matrix 9*4. How to do so?

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Answer 1

Stephen23 2020-1-25

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/501967-how-to-extract-numeric-values-from-char#answer_412013

在 MATLAB Online 中打开

>> C = {'{"name":"rect","x":101,"y":30,"width":239,"height":244}';
     '{"name":"rect","x":503,"y":88,"width":124,"height":165}';
     '{"name":"rect","x":123,"y":78,"width":93,"height":111}' ;
     '{"name":"rect","x":386,"y":47,"width":105,"height":112}';
     '{"name":"rect","x":582,"y":40,"width":100,"height":113}';
     '{"name":"rect","x":169,"y":50,"width":187,"height":209}';
     '{"name":"rect","x":563,"y":49,"width":131,"height":181}';
     '{"name":"rect","x":414,"y":128,"width":47,"height":53}';
     '{"name":"rect","x":315,"y":131,"width":26,"height":33}'};
>> D = regexp(C,'\d+','match');
>> M = str2double(vertcat(D{:}))
M =
   101    30   239   244
   503    88   124   165
   123    78    93   111
   386    47   105   112
   582    40   100   113
   169    50   187   209
   563    49   131   181
   414   128    47    53
   315   131    26    33