How do I read begin to read data after a string?

Question

Desmond Hutchinson 2020-8-5

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/575761-how-do-i-read-begin-to-read-data-after-a-string

评论： Walter Roberson 2020-8-5

In a txt file, I want to collect fcz data after "Concrete Stresses", how do I also Import the txt file to do so appropriately.

                               CONCRETE STRESSES
                               *****************
       ELMT       fcx       fcy       fcz       Vcxy      Vcyz      Vcxz
                 (MPa)     (MPa)     (MPa)     (MPa)     (MPa)     (MPa)
         1       0.000     0.000     0.000     0.000     0.000     0.000
         2       0.000     0.000     0.000     0.000     0.000     0.000
         3       0.000     0.000     0.000     0.000     0.000     0.000
         4       0.000     0.000     0.000     0.000     0.000     0.000
         5       0.000     0.000     0.000     0.000     0.000     0.000

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2020-8-5

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/575761-how-do-i-read-begin-to-read-data-after-a-string#answer_475696

filename = 'ConcreteStresses.txt';
S = fileread(filename);
idx = regexp(S, '^\s*\d', 'once', 'lineanchors');
fmt = repmat('%f', 1, 7);
data = cell2mat( textscan(S(idx:end), fmt) );
fcz = data(:,4);

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Walter Roberson 2020-8-5

In the case where the position of the first line of numeric data is known, it is even easier:

filename = 'ConcreteStresses.txt';
fid = fopen(filename);
fmt = repmat('%f', 1, 7);
data = cell2mat( textscan(fid, fmt, 'headerlines', 6));
fclose(fid);
fcz = data(:,4);