Math Forum / Math Software / MATLAB / April 2008

I tried generating exponential random numbers using the
following two methods and I am getting significantly
different results. (I am using this as the first step in
generating normal random numbers and the normal random

I've just tested matlab on a "just arrived" DELL Precision
M4300. The graphic card is an NVIDIA Quadro FX360M.
I run the matlab bench and I got ***extremely bad 3D
performances*** on both Matlab 6.5 and 2007b. When the

i have some lines drawn on axes using the standard 'plot'
function.  now i want to use 'patch' to overlay a
transparent shading _over_ the lines at a certain point such
that it shades (and somewhat obscures) the lines underneath.

I am trying to get a mex file from a fortran90 file, and I
can't. I am using Matlab2007a, Intel Fortran Compiler 9.1
and Visual Studio 2005.
Just as a first attempt, I tried to get mex file from

i need to convert the entire matlab programme into C++ .

I would like to convert c code into matlab to be used in a student
project.
Is there any converter, which I could use?
flo

Does Matlab have a function to geometrically scale a matrix?  Say you
have a 1x3 matrix [1 2 3].  Is there a function to scale it to a 1x4
matrix: [1 1.67 2.33 3].
Many thanks in advance,

i have got the source code for edge detection and
segmentation from this site but as i have to work on the
image so i need help to convert image to array so that i can
use these source codes by interfacing all the modules.

I am trying to classify my data with using GMM (in
Statistic toolbox) but results are not good. I wrote this
code given below.
...

How can I get the 8 or 24 bit representation of pixel
values of an image?

i want to convert negative value to +ve value
-7, -5 etc to always + values

Hello, I'm trying to write a gui that displays a preview
from a camera.  Inside one figure, I instantiate a new axes
(with its parent property set to the figure its inside), and
then want instantiate a new image with its parent set to the

i want to declare a matrix of n*m size

I have some code that combines different graphs etc. I want to save as
*.png-files. I save with this command:
       print(gcf, '-dpng', 'filename' )
I realised that since I'm going to squeeze for 4 graphs in one A4-

i need to import several files mixed with text / numeric data, in which
the # columns is unknown, therefor i use the importdata function.
Which works fine as long there is number at the end of line. But i also
have some files which contain only text, then the importdata func