Matlab

Using an image mask as a filter for video processing
I am trying to measure the change in area of an object for a neurophysiology assay. Currently, I load a video, crop it, apply a rgb filter to the frames of interest and pass that information onto bwlabel. I use bwlabel and regionprops to calculate the change in area for each frame, saving the data as a vector providing... 12 Jul 2010 20:43

Diagonal matrix recognition
I have a large square band matrix, which I can create as a banded matrix myself. In essence I can create a matrix like: 1 6 11 2 7 12 3 8 13 4 9 14 2 7 12 which represents something like: 6 0 13 0 0 0 7 ... 7 Jul 2010 17:52

3D cylinder generation
Hi, Is there a simple way of generating a solid 3D cylinder with given radius 'r' and height 'h' . I want to build the cylinder and then orient it in 5 different orientations by tilting the axis at different angles. (say 0, 30,45,60,90). Abhinav ... 8 Jul 2010 04:48

semi-transparent image or scatterplot
"Michael Robbins" <michael.robbins(a)us.cibc.com> wrote in message <eeb9f64.1(a)WebX.raydaftYaTP>... ...You should search the newsgroup before posting I know this is an old post, but many people are still having this problem (I have searched through all of the discussions I could find on this topic and did not find a... 11 Jul 2010 12:39

Reassign values
Thanks for the reply! That didn't quite do what I wanted though. y(b) =/= 9 always B= (9,9) 56 (10,9) 56 (11,9) 40 (12,9) 47 .... (9,10) 56 (10,10) 42 (11,10) 35 .... (288,400) 4 (396,400) 10 (397,400) 52 (398,400) 99 (399,400... 6 Jul 2010 18:55

Large fonts and axis labels
I'm probably missing something simple here, but I'm having a problem fitting axis labels with large fonts (24) into a figure frame that's anything less than full page. With the default-sized figure window my axis labels, especially the right-hand y label (I'm using plotyy), get cut off. I'm saving my figures as .ep... 10 Jul 2010 08:21

Is it possible to vectorize this?
I would like to ask you if it is possible to vectorise folowing process: I have a matrix A and a second matrix of indexes (idx) idx = 36 55 23 29 30 37 37 45 12 27 48 59 ........ I want to perform some calculation on A based on indexes idx and put the result... 7 Jul 2010 15:40

Reassign values
"Jacob Mick" <jam7w2DELETETHISTEXT(a)mail.missouri.edu> wrote in message <i108eu$jhc$1(a)fred.mathworks.com>... I have two matrices. A= 1x400 9,10,12,etc... B= 400x400 val = (9,9)=56 (10,9)=53 (12,9)=2, etc... How would I output a matrix C that is like B, except with the order of A, i.e. ... 6 Jul 2010 18:55

deaingl with dates stored as 'double' integers
Hello, I am trying to read date values from some array but of little/no avail. (this may seem trivial, but i just started using matlab 2 weeks ago) I have a huge array called 'ddmmyy' (210345x1) which contains different dates stored as double integers. e.g. ddmmyy(1) = 070403 which is 7th April 2003. My objec... 6 Jul 2010 18:55

Reassign values
I have two matrices. A= 1x400 9,10,12,etc... B= 400x400 val = (9,9)=56 (10,9)=53 (12,9)=2, etc... How would I output a matrix C that is like B, except with the order of A, i.e. C=(1,1)=56 (2,1)=53 (3,10)=2, etc... I've tried looking everywhere for help, it seems like there's a simple solution I'm ov... 6 Jul 2010 18:55