Reading values from a text file and converting to array.

Question

ARAVINDHAN RAMESH 2014-5-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/131484-reading-values-from-a-text-file-and-converting-to-array

回答： Pedro Rodenas 2017-6-11

采纳的回答： Cedric

U.txt

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I have a text file 'U.txt' which has data as follows:

#           x             0           0.3           0.4
#           y             0             0             0
#           z             0             0             0
#        Time
     0.000125   (0.101993 0 0)      (0.100009 0 0)          (0.100009 0 0)
      0.00025  (0.14199 0 0)       (0.0998676 0 0)          (0.0976896 0 0)
     0.000375  (0.161106 0 0)      (0.0989464 0 0)          (0.0895835 0 0)
       0.0005  (0.178717 0 0)      (0.0960872 0 0)          (0.0763535 0 0)
I want to extract the values of each column (without the header) into respective arrays.example:
Array1= 0.000125 0.00025 0.000375 0.0005  
Array2= 0.101993 0.14199 0.161106 0.178717
Array3= 0.100009 0.0998676 0.0989464 0.096872
Array4= 0.100009 0.0976896 0.0895835 0.0763535

Kindly help me out. Thanks in advance

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rifat 2014-5-28

could you please attach the text file?

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Answer 1

Cedric 2014-5-28

3
链接

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https://ww2.mathworks.cn/matlabcentral/answers/131484-reading-values-from-a-text-file-and-converting-to-array#answer_138611

编辑：Cedric 2014-5-28

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Here is one way to achieve what you want to do:

 >> content = fileread( 'myFile.txt' ) ;
 >> data = textscan( content, '%f (%f %*d%*d) (%f %*d%*d) (%f%*[^\n]', ...
                     'HeaderLines', 4 ) ;

where columns are stored into cells of cell array data:

 >> data
 data = 
    [4x1 double]    [4x1 double]    [4x1 double]    [4x1 double]
 >> data{1}
 ans =
   1.0e-03 *
    0.1250
    0.2500
    0.3750
    0.5000
 >> data{2}
 ans =
    0.1020
    0.1420
    0.1611
    0.1787
 >> data{3}
 ans =
    0.1000
    0.0999
    0.0989
    0.0961
 >> data{4}
 ans =
    0.1000
    0.0977
    0.0896
    0.0764

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ARAVINDHAN RAMESH 2014-5-28

It is very accurate. It just was not showing in the command window when printed. Thanks!

Cedric 2014-5-28

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Yes, the default display format is short, which rounds variables content when displayed in the command window. If you really want to see variables' content in higher precision, you can execute

>> format long

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