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textscan doesn't read the entire .m file

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Hello everyone,
WHAT I want to do: Get all the lines of any given function (.m file) into a cellarray of strings. e.g. for the 'sum.m' file I want a cell that looks like...
[x] = magicFunction('sum.m')
x = {...
'%SUM Sum of elements.'...
'% S = SUM(X) is the sum of the elements of the vector X. If X is a matrix,'...
'% S is a row vector with the sum over each column. For N-D arrays, '...
'% SUM(X) operates along the first non-singleton dimension.'...
WHY I want to do it: I want to be able to store my function (I'm just using sum.m as an example) with the variables created from that function. This way any settings or tweaks I made on that run will be saved with the variable. This is important to me because I have to do a lot of trial and error when doing analysis (I study neural response properties) and I may forget what properties I set.
I run 10's of programs sometimes with 20 important settings I need to record. Sometimes changing one setting at a time and then running it. The number of combinations get big pretty fast.
the below code displays my problem. You can run it on your machine to see what I mean
funcName = 'sum.m';
C ={};
C2 = {};
for k = 1: 1000
C{k, 1} = textscan(fid,'%s',1,'delimiter','\r', 'headerlines',k-1);
C2{k, 1} = textscan(fid,'%s',1,'delimiter','\n', 'headerlines',k-1);
for k = 1:length(C)
if ~isempty(C{k}{:})
for k = 1:length(C2)
if ~isempty(C2{k}{:})
I think that the "%S" in the "%SUM" in the beginning of sum.m is likely screwing me up because it is a string command??
Stephen23 on 9 Oct 2019
"I run 10's of programs sometimes with 20 important settings I need to record."
It is not clear from your question how those "settings" relate to the function code. Why not just store the settings themselves?
Phillip Maire
Phillip Maire on 9 Oct 2019
Yeah so that’s what I do. But it gets really tedious because sometimes I add more variables or comment them out. So then I’ll have saved variables that don’t apply or maybe some I forget to save.
Also if I made any error in my code that is associated with my .mat data file (i.e. if I forgot to initialize a variable and my data looks weird) I can trace that back to the code used to create it.

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Accepted Answer

Walter Roberson
Walter Roberson on 9 Oct 2019
You can use fileread() and splitlines().
However due to old habits I am more likely to use regexp() with the 'split' option than I am to use splitlines ()
Walter Roberson
Walter Roberson on 9 Oct 2019
That does not happen for me.
I suspect your file is created in MS Windows with CR+LF line terminators.
funcString = fileread('dummy1.m');
funcString = regexprep(funcString, '\r', '');
fprintf('%s', funcString);
There are other ways of coding the deletion of the \r instead of regexrep(), such as
funcString(funcString == 13) = '';
Phillip Maire
Phillip Maire on 9 Oct 2019
that worked! thank you so much you are extremely helpful!

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More Answers (1)

Steven Lord
Steven Lord on 9 Oct 2019
Rather than trying to save the contents of your code files as variables, why not set up a source control system? That way you can check each version of your code into the system and go back to any previously checked-in version of the file? You could check in a MAT-file containing the results at the same time, so you'll have traceability and time consistency.
  1 Comment
Phillip Maire
Phillip Maire on 9 Oct 2019
Yes this makes sense I use git hub for this. But it isn’t the same. There are no data associated with each version. I create .mat files and want the function used to create it stored with it.
To my best knowledge, source control systems don’t do that and aren’t designed to do that.
I appreciate your answer thank you

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