Math Forum / Math Software / MATLAB / July 2008

I am trying to make an intercom type application where Voice is
recorded on CompA, sent over UDP to CompB, and played back on CompB in
real time with a slight delay.
I am recording my voice using wavrecord, then sending that data to

Hi, I need to find all possible solutions of the equation
a^2+b^2+c^2+d^2=1, the values of the variables (a/b/c/d)
will be within the range -1 to +1. It would be nice if
anyone please help in this regard. Thanks a lot in advance.

how to return the index of positive row?
For example,
A = [1 2 -3; 4 5 6; 7 9 -8];
I expect a function returenpositive(A) = 2;

Hi all,
may i know how do i assign to a series of variables?
for example i tried :
for k=1:100

between 0 & 1, and has a specified mean and standard
deviation. (Soemthing like a amplitude varying duty cycle

I like to define funcions (f(w)) so that the smallest
frequency is on the left and the largest is on the right.
So when I use fft to fourier transform this fucion I have to
do it like this:

I have written a class using the 'handle' parent class. I
understand that the default behaivior for derived classes
of this type is that when a copy is made (using the copy
constructor):

There's got to be a simple way to do this. Suppose you have
A and B, with
size(A) = [N 1]
size(B) = [1 T]

I am a beginner in matlab and i seriously need some help.
MY PROBLEM:
 I have a grayscale image(1024 X 1280) of a pyrovalve(a
valve used in rocket engines, looks like a small piston

I want to generate a non-uniform distribution (or random
numbers )whose value varies between 0 & 1, and has a
specified mean and standard deviation. (Soemthing like a
amplitude varying duty cycle varying pulse train with some

I am trying to use the low-level matlab HDF5 functions to create a
extendible dataset. I am mostly converting the code from the
"Introduction to HDF5" (in the section on Extendible Datasets) guide
found at the website: <http://hdf.ncsa.uiuc.edu/HDF5/>

I have a problem with some Fortran mex-files.
On our Linux x86-64 cluster (which runs Matlab R2006b), I
can run mex-files which seem to return sensible results.
However, when I quit the Matlab session using the "exit"

I've just started using MatLab R2007a Student Version on Mac OS X (Tiger) and I
have problems with plots. This code produces very bad looking labels on the
axis (on screen and when printing):
x = [0:10];

I want to be able to view images in a figure window as i update them.
If I run the script:
figure(1)
im=rgb2gray(imread('http://192.168.1.30/goform/video'));

Hi - I'm a newbie so I apologize in advance.
I want to evaluate integrals like:
\int_D p(\vec(r)) exp(i\vec(r) \cdot \vec(q))d\vec(r)
where D is some 3D domain, i.e., its a 3D Fourier transform.