Comments on: A new look for connected component labeling in R2009a – Part 3

By: Steve

Steve — Fri, 24 Jul 2009 00:31:09 +0000

Sven—Glad to hear it’s working for you. For those cases when you need L, you might consider consider computing it with L = labelmatrix(bwconncomp(BW)). That way you’ll get L with a more memory efficient data type.

And I’ll make a note to ask the M-Lint team if they can refine the pattern detection so the message won’t be issued if L is used elsewhere in your code.

By: Sven

Sven — Tue, 21 Jul 2009 00:18:46 +0000

I am probably one of the target audiences for this change, and yes, I’d say at least 50% of the time I calculate L, it’s simply to send to regionprops.
When I first upgraded to 2009, I encountered the M-Lint message during an instance where I actually wanted to keep the L matrix. I remember being a little confused about the message – mostly because I was used to the old method. Therefore, I left things as they were, and accepted that my once ‘all green’ functions had some specs of ‘lint-orange’ in them.
When my data sets grew and I started getting out of memory errors however, I was thankful that the seed was planted by the M-lint messages, so it didn’t take much time to fully understand the new usage, and just browse through my functions updating where necessary.
Now, my more data-rich (ie, larger) data sets can be processed without memory errors.
Thanks for the update!

Cheers,
Sven.

By: Ken Orr

Ken Orr — Mon, 20 Jul 2009 16:53:41 +0000

M-Lint is a wonderful thing! We have a whole bunch more articles on M-Lint over at the Desktop blog: Click for more information Finding the right M-Lint message Sharing your M-Lint settings -Ken