Comments on: Advanced MATLAB: File name processing from directory listing

By: Yuri

Yuri — Tue, 13 Sep 2011 15:41:11 +0000

By the way, if someone need just a list of filenames, it can be done in several ways without for-loop.

namelist = ls('*.dat'); % as a char array
namelist = cellstr(ls('*.dat')); % as a cell array of strings
namelist = {files(:).name}'; % from dir output

By: Yuri

Yuri — Tue, 13 Sep 2011 15:16:35 +0000

Doug, a small correction. ‘*’ in regular expressions means 0 or more. It is ‘+’ that mean 1 or more. So if we have a file ‘data.dat’, it will also match your regexp returning empty string as a token.

By: KASA

KASA — Wed, 13 Apr 2011 19:13:19 +0000

Hello guys
Do you have any idea of how can I list files from the web site?
for example, I have many images that have this form 20110101_0000_c2_512.jpg to be processed the only thing changes is 20110101_THIS_c2_512.jpg and it has to be 4 digits start from 0000 to 2354
this is the website
http://sohowww.nascom.nasa.gov//data/REPROCESSING/Completed/2011/c2/20110101/
I want to list these files, just the image files.
your help is appreciated in advance

By: Doug

Doug — Thu, 25 Feb 2010 20:52:12 +0000

@Kaija,

Use {} not ()

Doug

By: Kaija

Kaija — Wed, 24 Feb 2010 09:21:19 +0000

I’m trying to get the number from my filename, and I’m doing exactly as shown in the video, but when I type ans(1) my answer is 1×1 cell.
Do you know what I’m doing wrong?

/Kaija

My filename is tpjp199202.mon and my commands are:

files=dir(‘*.mon’);
name=files(1).name;
regexp(name,’tpjp(\d*).mon’,'tokens’);
ans

ans =

{1×1 cell}

ans(1)

ans =

{1×1 cell}

By: Doug

Doug — Tue, 09 Sep 2008 15:35:40 +0000

Matt,

That is an excellent suggestion. I just posted it to our internal enhancement tracking database. You can make such requests more reliably by e-mailing support@mathworks.com

Thanks,
Doug

By: Doug

Doug — Tue, 09 Sep 2008 15:30:00 +0000

David,

Actually, I tend to do a little bit of both. It is hard to say when I work at the command line and then script and when I write a script and just keep running it as you add to it.

Doug

By: matt fig

matt fig — Tue, 09 Sep 2008 15:28:47 +0000

Off topic, but David’s reply made me think about an enhancement I would like to see. Imagine scrolling up through the command history, either through the editor or by using the up arrow. When you came across a command that caused an error, it would be in red font. Boy that would make life simpler when looking through several similar commands, some of which didn’t work.

By: david

david — Tue, 09 Sep 2008 15:08:34 +0000

nice. just a thought:
rather than trying ideas in the command window, one idea is to do this using the editor in cell mode. that way, when you’ve figured out the right syntax, you almost have a finished script. this also saves scrolling through the command history for the correct version of each command which after trial-and-error often look similar to versions that don’t quite work

regards,
david