How do I pass a filename to a routine in Matlab's command window?

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Harald von der Osten 2021-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/1456334-how-do-i-pass-a-filename-to-a-routine-in-matlab-s-command-window

编辑： Jan 2021-9-23

采纳的回答： Jan

在 MATLAB Online 中打开

In the Matlab Command window I would like to run a function with an input parameter, like this:

>> xxxreplace oldGEOPLOT
s = 
    "./html/oldGEOPLOT.html"
Error using fread
Invalid file identifier. Use fopen to generate a valid file identifier.
Error in xxxreplace (line 14)
ff=fread(fid,'*char')';

I'm using this code :

function file=xxxreplace(x)
f=string(x);
s=strcat('./html/',f,'.html')
fid=fopen(s,'r');
ff=fread(fid,'*char')';
fclose(fid);
ff =strrep(ff,'.png" alt="">','.png" alt="" width="360">');
fid=fopen('./html/new.html','w');
fprintf(fid,'%s',ff);
fclose(fid);
disp(s)
end

Why do I get this error?

Thanks a lot,

Harry

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Matt J 2021-9-19

Is the Current Folder the same in both cases?

Harald von der Osten 2021-9-19

yes

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采纳的回答

Jan 2021-9-19

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1456334-how-do-i-pass-a-filename-to-a-routine-in-matlab-s-command-window#answer_790599

编辑：Jan 2021-9-23

在 MATLAB Online 中打开

The error message is clear: The file does not exist. Although you assume, that the current folder is the same, this is not true. Check this explicitly:

function file = xxxreplace(x)   % What is "file"?
s = fullfile('./html/', [x, '.html']);
[fid, msg] = fopen(s, 'r');
assert(fid > 0, msg);
ff = fread(fid,'*char')';
fclose(fid);
ff  = strrep(ff,'.png" alt="">','.png" alt="" width="360">');
[fid, msg] = fopen('./html/new.html', 'w');
assert(fid > 0, msg);
fprintf(fid, '%s', ff);
fclose(fid);
end

Trusting on the current folder is a bad programming practice. Any timer or gui callback might change the current folder unexpectedly. Prefer to use absolute file names.