How can I edit a '.m' file by another '.m' file ?

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Abhijit Chougule 2017-2-18

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https://ww2.mathworks.cn/matlabcentral/answers/325693-how-can-i-edit-a-m-file-by-another-m-file

评论： BABANBHAIGARI SHAFIULLAH 2021-8-31

采纳的回答： Image Analyst

Can we edit a '.m' file from another '.m' file ? Like we can modify/update a model and save it by a M script.

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Answer 1

Image Analyst 2017-2-18

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https://ww2.mathworks.cn/matlabcentral/answers/325693-how-can-i-edit-a-m-file-by-another-m-file#answer_255326

Yes. Open it with fopen(), get lines out into strings with fgetl(), modify them as needed. Open an output file with fopen(), write the modified lines out. Close both files with fclose(). Delete the input file with delete(). Rename the output file to the input filename with movefile().

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Shubham Gupta 2019-4-12

在 MATLAB Online 中打开

Thanks for your warm reply. I am sorry I did not phrase the question very clearly. Let me just repharse my question in little bit more detail with examples.

First, I have a m-File which looks something likes this : (below is just an example)

%%%% Test1 %%%%%
% Front 2.5
% Rear 1.5
%%%% Model Parameters %%%%%
X_File
Y_File
Z_File
%%% Current %%%%
CUR_L_F = 0.3;
CUR_L_R = 0.3;
CUR_H_F = 1.6;
CUR_H_R = 1.6;
%%% Velocity %%%%
v1=[2,3,4];
c1=[10,20,30];

Next, I have another m-File which looks like this : (Note that only parameter values are different)

%%%% Test2 %%%%%
% Front 2.65
% Rear 1.98
%%%% Model Parameters %%%%%
X_File
Y_File
Z_File
%%% Current %%%%
CUR_L_F = 0.34;
CUR_L_R = 0.33;
CUR_H_F = 1.64;
CUR_H_R = 1.63;
%%% Velocity %%%%
v1=[2,3,4];
c1=[10.1,20.5,35];

Also, I have an Excel file with parameters name and their values in front of it, which I change during tests. When I am satisfied with results of the test I update the m-File using Excel File values but since there are like millions of parameters it takes time to update the mFile. So, I thought I can write a "script file" to let MATLAB do it for me. I tried following : ( I haven't read excel file but I can do that so that should not be problem )

clear
clc
% Open the file.
fileID1 = fopen('test1.m', 'r');
fileID2 = fopen('test2.m', 'w');
for i=1:20
    textLine = fgetl(fileID1);
    if isempty(textLine)==0
        if textLine(1)=='%'
            continue; % Skip lines starting with a %
        end
    end
    fwrite(fileID2,[textLine,double(sprintf('\n'))]);
end
fclose(fileID1);
fclose(fileID2);

This gives me the result : ( I wanted comment sections/lines to remain as they were, wanted only uncommented part to be same as "test.m "

X_File
Y_File
Z_File
CUR_L_F = 0.3;
CUR_L_R = 0.3;
CUR_H_F = 1.6;
CUR_H_R = 1.6;
v1=[2,3,4];
c1=[10,20,30];

Hope I have made myself a little more clearer, Let me know if you need more info. Thanks :)

Image Analyst 2021-8-31

在 MATLAB Online 中打开

@BABANBHAIGARI SHAFIULLAH, open a file for reading and writing. Then read until you recognize the section, then write to the output file:

% Open the input file for reading in text mode.
inputFileID = fopen(inputFullFileName, 'rt');
% Open the output file for appending in text mode.
outputFileID = fopen(outputFullFileName, 'at');
% Read the first line of the file.
textLine = fgetl(inputFileID);
lineCounter = 1;
writeToOutput = false; % Set to true once we get to the section we want.
while ischar(textLine)
	% Print out what line we're operating on to the command window.
	fprintf('%s\n', textLine);
	% Read the next line.
	textLine = fgetl(inputFileID);
	lineCounter = lineCounter + 1;
	if contains(textLine, '%%% Acceleration %%%')
		writeToOutput = true;
	end
	if writeToOutput
		fprintf(outputFileID, '%s\n', textLine);
	end
end
% All done reading all lines, so close the files.
fclose(inputFileID);
fclose(outputFileID);