How to modify few numbers in a random text file?

Question

Jay Vaidya 2021-2-4

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/736017-how-to-modify-few-numbers-in-a-random-text-file

编辑： per isakson 2021-2-5

采纳的回答： per isakson

model_v2.txt

在 MATLAB Online 中打开

I am uploading a text file related to a model in an electronic simulator. How to modify the 4 parameters named with

toxe = %1.1d
toxp = %1.1d
toxm = %1.1d
vth0 = %1.1d

If this text file didn't have format specifier, I would just write this file using

model = fileread(fullfile(pathname_model,filename_model));
File_model = fopen(fullfile(dirname,filename_model),'w');   
fprintf(File_model,'%s',model);
fclose(File_model);

Since now I want to modify a few parameters each time I run my code, I edited the text file and put format specifier but I don't know how can I print the modified file now.

Is this correct?

model = fileread(fullfile(pathname_model,filename_model));
File_model = fopen(fullfile(dirname,filename_model),'w');   
fprintf(File_model,'%s',model, par1, par2, par3, par4);
fclose(File_model);  

where par1 to par4 are the first 4 parameter values that I listed at the top.

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Answer 1

per isakson 2021-2-5

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/736017-how-to-modify-few-numbers-in-a-random-text-file#answer_615267

编辑：per isakson 2021-2-5

在 MATLAB Online 中打开

Try this

%%
chr = fileread('model_v2.txt');
ffs = 'model_out.txt';
fid = fopen( ffs, 'w' );
[~] = fprintf( fid, chr, 1.2, 3.4, 5.6, 7.8 );
[~] = fclose( fid );