Read and replace text in a file, save as .m

Question

Charles Cummings 2019-1-22

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/440969-read-and-replace-text-in-a-file-save-as-m

评论： Charles Cummings 2019-1-23

I have a .prm file i am trying to manipulate the values of within a script I created. I am able to find the specific line the text i am trying to change using

st = fopen('changes.txt','r') % i changed the file type to a .txt file and placed it in the same location
fgetl(st) %have to use this command 7 times before I find the right line.

But that is as far as I've gotten that seems to be right. the file is of the format

command argument

where I am attempting to change the numerical value used in argument.

Have attempted using a number of functions to load the data and fopen was the only one that seemed to get anywhere

Thanks!

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Answer 1

Walter Roberson 2019-1-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/440969-read-and-replace-text-in-a-file-save-as-m#answer_357563

在 MATLAB Online 中打开

S = fileread('changes.txt');
newS = regexprep(S, 'command.*$', 'command NEWVALUE', 'dotexceptnewline', 'lineanchors');
fid = fopen('new_changes.txt', 'wt');
fwrite(fid, newS);
fclose(fid);

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Charles Cummings 2019-1-23

Is it possible to loop through the newvalue?

S = fileread('changes.txt');
newvalue=0
for newvalue<10000
    newvalue=newvalue+500
newS = regexprep(S, 'command.*$', 'newvalue', 'dotexceptnewline', 'lineanchors');
fid = fopen('new_changes.txt', 'wt');
fwrite(fid, newS);
fclose(fid);
end