Math Forum / Math Software / MATLAB / July 2008

I have a question concerning colormaps.
I want to draw on a black and white image a green perimeter.
To do so, I thought I would take the black and white image
(each pixel being mapped for a gray(256) colormap), change

I have an image that has multiple triangular regions, and I
know the coordinates of vertices to those triangles with the
help of delaunay function.
How can I extract all the pixels located inside those

I try to demonstrate the aliasing effect on wav files, is
this correct? I don't know how aliasing sounds like...
[data,fs,nBits]=wavread('filename.wav');
gr=size(data);

I want to an array that is inside a cell array empty
let us say we have a, which is a cell array , I want to make
the array in the postion a(3,3) empty ((this means contains
nothing, so that when apply the function isempty the answer

Is there some function in matlab that plots the basis function only for a
B-spline and not the B-spline itself?

I have some data like
1
2
3

  I am looking for a structured quadrilateral mesh
generator for polygon domains (preferably arbitrary
domains). Most codes always use triangles. Is there a way to
merge the triangles into quadrilaterals? Please help me.

I encountered a very strang problem and I hope you can help me.
I developed an application with MATLAB 2007B, and one part of this
application is to plot a figure, and its structure is as the
following:

I'm using MATLAB with the CMU driver for my Firewire AVT
Guppy Camera.
When I use the hardware trigger of the camera, I get a
warning when I use the getdata command.

I am writing a simulink program using S-function. In that
program, I am reading vector from mat file that I need to
compare against real time data at every sample time. And,
also I want to do some calculation between real time data

I'm looking for a way to display a simple progress monitor
by outputting text to the command window.
Currently the only way I've found of doing this is like so:
for n = 1:N

i have to take  two images of a curve from orthogonal
directions.
than digitise the 2d data and use them to generate 3d curve.
the curve is very random ( so cannot be interpolated by the

I have a function that returns a vector v1, I can do the following:
size(v1)
ans =
          1        1001

I have: a vector of latitude (call it lat is 31x1), a vector
of longitude (1x58), and my data (call it data 31x58). It is
in spherical grid. I need to translate my coordinate system
into cartesian grid. This requires translating coordinates

Hi I have written some rather length code for optimisation
using genetic algorithms but it is very slow at running
which is limiting its use. I have made attempts to
vectorise it, but hit brick walls with regards to some of