Uigetfile - Is there a neater way of moving my files?

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10B 2015-9-28

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评论： 10B 2015-10-5

采纳的回答： Image Analyst

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Hello Community,

After my script has run I want to do a little housekeeping and save various .mat, .jpg and .fig files to a specific file (that I create with user input slightly earlier in the script). At the moment I create the new folder with this:

mkdir(input('Enter new folder name (same as img count): ', 's'))

then when its time to save the .mat, .jpg and .fig to this newly created folder I use this code:

[filename, pathname, filterindex] = uigetfile( ...
{  '*.mat','MAT-files (*.mat)'; ...
   '*.fig;*.fig','figures (*.fig)'; ...
   '*.jpg;*.jpg','Jpgs (*.jpg)'}, ...
   'Pick a file', ...
   'MultiSelect', 'on');

to manually select the relevant .mat, .jpg and .fig files from the dialogue box and basically drag and drop them in the newly created folder and then close the dialogue.

This doesn't seem like a very efficient way of doing this - but I haven't managed to work out another way.

Does anyone have any suggestions on how to improve this workflow?

Regards,

10B.

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Image Analyst 2015-9-28

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In your script, set a desired destination folder and use fullfile to save them directly so that there is no need to move them.

desiredFolder = 'c:\whatever';
baseFileName = 'myApp.mat';
fullFileName = fullfile(desiredFolder, baseFileName);

Then do whatever you already to to save or create these files. If you don't use a folder, then they just save to the current directory and you have to move them like you're doing (but don't want to do).

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Stephen23 2015-9-29

编辑：Stephen23 2015-9-29

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By "simply" changing the parentheses for square brackets you have completely changed the meaning of Guillaume's regular expression. The original regular expression should have checked if that particular sequence of characters precedes one or more digits, except Guillaume made a small mistake, a missing '<':

>> regexp('IMG_1234','(?=IMG_)\d+','match','once')
ans =
>> regexp('IMG_1234','(?<=IMG_)\d+','match','once')
ans = 1234

What you have now simply checks that one single character before one or more digits is not any of the ones in the brackets. This is basically a useless check, because that first character will be one of the digits themselves... so for your filenames it is practically equivalent to this:

>> regexp('IMG_1234','\d+','match','once')
ans = 1234

Learning how regular expressions are defined takes a lot of reading the documentation and plenty of practice. It is not just a "simple" replacement of parentheses with square brackets, because this actually changes the entire meaning of the regular expression.

This can help you define regular expressions, and see their effects:

http://www.mathworks.com/matlabcentral/fileexchange/48930-regular-expression-helper

Guillaume 2015-9-30

Yes, as Stephen has pointed out, my regular expression was simply missing a '<' (not sure how that came about, since I did test it with the '<' in place). Your regular expression with [] does not do what you want. It means:

[^....] match a single character that is not any of the character in the enclosed brackets

[^?=IMG_]... so match any character that is not ?, =, I, M, G or _

...\d+ followed by one or more digit.

The regular expression returns the whole match, that is the character matched by the [..] and the digits matched by \d+. So your expression will happily match A1234, 12, 1234, IMG_1234, but not IMG_1

In the case of IMG_1234, your regular expression go over I, rejects it because of the first rule, same for M, G and _. It then go over 1 and accepts it because it's not one of ?=IMG_. It then matches 234 with \d+. It can't match IMG_1 because after the 1 has matched the [...] there is no digit left to match the \d+. As you can see your regular expression only work by accident.

My (corrected) regular expression means:

(?<=...)... look behind whatever you match for the expression in the bracket, so

(?<=IMG_')... the match has to be preceded by IMG_

...\d+ the match is a sequence of one or more digit.

This will only match 'IMG_' followed by one or more digits, and nothing else.

Bjorn Gustavsson 2015-9-30

My suggestion is to scrap the regexp, you will sooner or later want to use the functionality on images that doesn't follow the current pattern (IMG_NNN.ext) and then it will break. Instead use the fileparts function - it will separate [the path-string and] the name and the extension regardless of what pattern it follows. Be lazy when possible.

10B 2015-10-5

Thanks Bjorn - I will have a look at the fileparts function. I was unaware of this previously.

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