Math Forum / Math Software / MATLAB / July 2008

I am interfacing port to generate clock via parallel port. Is there any fucntion in C which can introduce a given delay . I remember in TURBO C++ 3.0, there was a function delay(milliseconds) in file 'DOS.H'

I have to improve an already existing MATLAB code. To give
you the general idea of the code, there is an electrical
network which has 18 switches. Using GA, the program tests
several topologies (combination of open and closed

I have to plot an ellipsoid in a 3d visualization on matlab.
the code is very simple:
a_x=2;
a_y=3;

I have a MATLAB Bar Plot question for the group. I'm generating a bar
plot using the following command in MATLAB:
bar(data);
where 'data' is a 3x4 matrix that looks like this:

run as follows:
%%%%%%%
syms q0 q1 p1 s A V0 x rou;
F=ilaplace(V0/(s+A)*exp(-rou*s*x/(q0/s+(q1/p1-q0)/

I need to compute the Hessian to find standard errors for
an MLE.  However, there are some boundary constraints that
cannot be violated in computing the finite differences.  
John D'Errico's Derivest Suite has very nice tools for

I wrote a C++ Mex file and it compiles without any errors
and warnings. When I try to call the function, Matlab closes
automatically. I debugged with MS Visual Studio 2005 and the
function was able to return to Matlab with correct answers.

i have a matrix with numbers of -1 and 1 i want to switch
them, in communication i.e. map them using the binary shift
keying at the receiver side. I should get 1 for 1 and -1
should equal 0. I have written the for loop but what seems

does rand in matlab only applicable for numbers?
What can I do if I want to randomise the files?
for examples:
wavread (file1);

I am having a problem on how to solve the equation out.
Suppose i am having a column vector:-
s=[3;-5]
when i attempt to apply non-integer power of 3/5 on the

I am trying to send/receive data between two computers running Matlab
with the tcpip object.
From what I can tell, there is no way to have Matlab "LISTEN" for the
other computer to open a TCP connection.

Suppose I use a loop to plot 5 figures (i.e, i=1:5). Now I want to
show the value of i in the title of each figure so that I can index
each figue (since different value of i represents different
variable ). But if I use title(' i '), it only shows i on top of each

i have a matrix with numbers of -1 and 1 i want to switch
them, in communication i.e. map them using the binary shift
keying at the receiver side. I should get 1 for 1 and -1
should equal 0. I have written the for loop but what seems

c is a 1000 x 3000 matrix and we have a need to set all elements < 0 to
0 hundreds of thousands of times in our program.  The profiler shows
that c(c<0) = 0 is a bottleneck.  We Mex'd the same code and it
seems to take 1/3 the time.

Dear friends;
I Prepare a Mathematical Model.The objective function  and
Constrains are linear.
Following matrices are created using Horzcat command in