MATLAB: How to print string or variable in plot title

filenameMATLABplotstorestringtitle

I want to prompt for a file name, e.g. "4.dat", "6.dat", etc. I want to store it as a string to be used both to open that file — e.g. importdata(fileToRead1) — and to print later on in the title of a plot, e.g. title(y(x) vs x using fileToRead1), where fileToRead1 is instead '4.dat', '6.dat', etc. It would be even better if I could say "4 [some text]" instead of "4.dat", but beggars can't be choosers. It is possible, isn't it? But I can't figure it out:

filename = input('filename? ','s');
title('testing' {filename})
title('testing {filename}')
title('testing filename')
title(filename)

The first title command doesn't work, the middle two print 'filename' without braces; the last prints the string stored in filename. I think you know what I want to do; please help!

Best Answer

filename = fileToRead1;
dotpos = find(filename == '.', 1, 'last');
if ~isempty(dotpos); filename(dotpos:end) = []; end

Then either

title(sprintf('y(x) vs x using %s', filename))

title(['y(x) vs x using ', filename]);

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MATLAB: Saving textfiles in a other folder

It's never a good idea to modify the matlab path (with addpath or others) just to read or write data files.

The simplest way to make sure that a file is read or written in the correct folder is to simply specify the folder as part of the name when you read/write. It's easy to do: use fullfile. You've done exactly that for your dir call. Why didn't you do the same for your fopen calls.

On a completely unrelated subject, matfiles is a fairly good variable name (dircontent may be better), FileName is also a good variable name, it's easy to understand what the variables contains. B is a horrendous variable name. It's also completely pointless in your code, it's unclear why you couldn't just have done

FileName = matfiles(i).name;

and not bother with the B or even better, keep using matfiles(i).name everywhere.

So, in the end:

testfiledir = 'E:\Data\Test\X';  %assuming it's both the input and output directory
matfiles = dir(fullfile(testfiledir, '*.txt'));
for i = 1:numel(matfiles)
Data = fileread(fullfile(testfiledir, matfiles(i).name));
Data = strrep(Data, ',', '.');
FID = fopen(fullfile(testfiledir, matfiles(i).name), 'w');
fwrite(FID, Data);  %no need for char. not sure char is even valid
fclose(FID);

While you could also use readmatrix or readtable as suggested, it may change other formatting of the file and will be slower than the above due to the parsing it does.

MATLAB: Output Filename With Print Command

There is no '-s' option by itself, just '-s' followed as part of the same option by the modelname.

print('-dps', ['-s', gcs], filename)

Best Answer

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MATLAB: Output Filename With Print Command

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