replace a random number in a line of a text file

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sajad mhmzd 2021-9-30

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评论： sajad mhmzd 2021-10-1

how can I replace random number (with 'randi()' commond) in a text file? for example I want replace "1.035" in the below line with a random number:

"x coordinate = 1.035"

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Answer 1

Walter Roberson 2021-9-30

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https://ww2.mathworks.cn/matlabcentral/answers/1463689-replace-a-random-number-in-a-line-of-a-text-file#answer_798294

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In the below, the isunix() branch is to put in example text since I do not have a file to work with. In your actual code, you would just have the fileread() without the if isunix()

filename = 'example.txt';
outfilename = 'modified.txt';
if isunix()
    S = sprintf('Number of nodes: 5\nx coordinate = 1.035\ny coordinate = -3.873\n')
else
    S = fileread(filename);
end
S = 
    'Number of nodes: 5
     x coordinate = 1.035
     y coordinate = -3.873
     '
newvalue = string(10*randn(1,1))
newvalue = "1.9462"
newS = regexprep(S, '(?<=x coordinate = )(-?[\d.]+)', newvalue)
newS = 
    'Number of nodes: 5
     x coordinate = 1.9462
     y coordinate = -3.873
     '
[fid, msg] = fopen(outfilename, 'w');
if fid < 0; error('could not open output file "%s" because "%s"', outfilename, msg); end
fwrite(fid, newS);
fclose(fid)
ans = 0
dbtype(outfilename)
1     Number of nodes: 5
2     x coordinate = 1.9462
3     y coordinate = -3.873

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sajad mhmzd 2021-9-30

thanks man

sajad mhmzd 2021-10-1

I wrote my own code for replacing a Num in a string but there is a problem. in the second loop the number 12 replace with 132 insted of 13 and i've been confused.

F = 'bodyNameRefManager_1.setBodies(new NeoObjectVector(new Object[] {}));';

for i=12:13

str_e = sprintf('bodyNameRefManager_%0.0f',i);

new = regexprep(F,'bodyNameRefManager_(\w)', str_e)

F = new;

end

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