Function

I'd like to be able to apply this function loads,plots and saves figure data from a text file, to every file in a directory, such that when I type FunctionName(some directory), the function forks...

this is my code:

function plot;

files = dir('*.txt');

for i=1:length(files)

data = load(files(i).name);

filename=[files(i).name];

plot(data);

saveas(h,filename,'fig');

close; 

end

end

Answer 1

[Fangjun Jiang]

1. plot() is a built-in function so you should not name your own function as plot.
2. It is better to have an input argument specify the folder so you can use it to apply to many folders.
3. When load or save, it's always better to specify the full path of the file.
4. When you try to get the file name, you need to get rid of the .txt extension.
5. close() needs to specify the figure handle.

function MyPlot(PathStr)
files = dir(fullfile(PathStr,'*.txt'));
for i=1:length(files)
    data = load(fullfile(PathStr,files(i).name));
    filename=strrep(files(i).name,'.txt','');
    f=figure;
    plot(f,data);
    saveas(h,fullfile(PathStr,[filename,'.fig']));
    close(f);
end

[Baba]

Do I need to define what PathStr is anywhere else? Or should I be able to just type in MyPlot(some path) to perform this function on all files in that folder?

[Fangjun Jiang]

Yes, for example, MyPlot('C:\MyDocument\Data')

[Baba]

Getting an error:

??? Undefined function or variable 'textfiles'

textfiles being the subfolder name where textfiles are located

I use myPlot(textfiles)to call the function

[Walter Roberson]

myPlot('textfiles')

Answer 2

[Daniel Shub]

What problems are you having. the code looks pretty close. You don't define h, so I just replaced it with gcf (the current figure). Your function didn't take in the directory name like you need (or make use of the directory name).

function FunctionName(DirectoryName)
  cd(DirectoryName)
  files = dir('*.txt');
  for i=1:length(files)
    data = load(files(i).name);
    filename=[files(i).name];
    plot(data);
    saveas(gcf,filename,'fig');
    close;
  end
end

[Baba]

the problem is when I type in FunctionName(DirectoryName)

i get an error:

??? Undefined function or variable 'DirectoryName'.

For DirectoryName I typed in a folder within the working directory which contains my text files