Problem with looping through Folder finding pattern

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B_Richardson
B_Richardson 2011-7-18
Hello everyone,
I am attempting to loop through a folder using this code:
files = dir(MyFolder);
Pattern = MyPattern % im searching for files that match a certain pattern
for i = 1 : numel(Myfolder) %loop through Myfolder
% this next line below is where the error is coming from
value = getfield(files,{i},'name') %iterate through each file in the structure, "files"
% i did this because I need a string to use in strfind below
if strfind(value,Pattern) %check to see if current file matches Pattern
f = fullfile(MyFolder,value) %construct fullpath
% do more stuff
end
end
Im not sure if this is the best approach, but the idea is to loop through MyFolder and construct a fullfile if a file matches pattern.
This is the error generated. It comes from getfield:
??? Index exceeds matrix dimensions.
Error in ==> getfield at 46
f = f(index{:});
Error in ==> UI>pushbutton2_Callback at 252
value = getfield(files,{i},'name')
Any advice on a better approach would be great.

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采纳的回答

Fangjun Jiang
Fangjun Jiang 2011-7-18
value=getfield(files(i),'name') or
value=files(i).name
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Fangjun Jiang
Fangjun Jiang 2011-7-18
That is probably true. But remember, all that "for i = 1 : numel(Myfolder)" statement does is to generate a vector i=1:70 since your folder string has 70 characters. If you happen to have 70 or more files in that folder, you won't have any problem at all (although it is still not right because the rest of the file names are not searched). But if you have less than 70 files, then files(70).name is nowhere to find. That is the error you got.
Fangjun Jiang
Fangjun Jiang 2011-7-18
to help, just type numel(MyFolder) and numel(files) in command window to find its value.

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Walter Roberson
Walter Roberson 2011-7-18
Also if the pattern is sufficiently simple you might be able to code it using wildcards in the dir() itself. The patterns accepted on Linux and MacOS systems are usually those expressible as pure regular expressions, which is often more than enough.
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Walter Roberson
Walter Roberson 2011-7-18
For example, in Unix-type systems you could match against
dir('2009-10-14 11-13-04_[RS]HA_[LR]L_S[123]_0006FinalData.mat')
That would overshoot a little in that it would match SHA_RL_S1 (for example) which is not one of the patterns in your list, but a fair bit of the time that would be "close enough".
In MS Windows, I do not know how finely it can be controlled, but I know you could use (e.g)
dir('2009-10-14 11-13-04_?HA_?L_S?_0006FinalData.mat')
each ? would match a single character.

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