How to read specific columns of a Txt file and store them in an array?

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MD MOSTAKIM ALAM SOHAG 2021-3-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/770753-how-to-read-specific-columns-of-a-txt-file-and-store-them-in-an-array

评论： Star Strider 2021-3-14

I need to calcilate from coloum 4, initial data : row 1 coloum 4........... the from initial data i need to subtrct others data from coloum . then save the data . For better understnding. i have upload two photo. Please help me to solve this problem.

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采纳的回答

Star Strider 2021-3-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/770753-how-to-read-specific-columns-of-a-txt-file-and-store-them-in-an-array#answer_646013

在 MATLAB Online 中打开

Try this:

T1 = readtable('Data.txt','HeaderLines',1);
T1.Properties.VariableNames = {'t', 'vd', 'zd', 'mdro'};
T1.mdro = T1.mdro-T1.mdro(1);

and:

FirstFiveRows = T1(1:5,:)

produces:

FirstFiveRows = 
      t        vd           zd          mdro  
    _____    _______    __________    ________
        0        -10       0.00012           0
    1e-07    -9.9908      0.000119    -3.7e-11
    2e-07    -9.9704      0.000118    -5.4e-11
    3e-07    -9.9576    0.00011701    -6.6e-11
    4e-07     -9.924    0.00011601    -7.4e-11