Math Forum / Math Software / MATLAB / July 2008

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

I am a 2007b Matlab user. I have a set of categorical data
in form of 0 and 1.What type of Neural network can I use;
Should I make any transformation to my initial data since
they are clean;

I need to generate random numbers (between 0 and 100) with
a specified mean and a specified variance. Any ideas how to
get this?
Thanks

I wrote a function that needs 8 inputs.
In order to avoid confusion while calling the funtion I
would like to make a GUI that:
-pops out as soon as I call the function

I am beginner in MATLAB. I have many excel sheets where each
row represents pollutant concentration in a country while
columns represent years. The data aren't available for all
countries. I have 4 or 5 out of the 20 countries where the

I am plotting to sets of data into the same figure (2-
graphs) using the plotyy function. I have to find the
Correlation Coefficient between these two graphs. I have
used the following:

Hey all,
I have a group of uicontrols(~50) and sometimes also a few
java components, i'd like to store all their handles in one
array (to avoid having to always check if a second array of

Hi, I am trying to plot a real time graph based on input
from serial port.
The serial port outputs the data in the form of
000453000221000004 and so on which is the time lapse. I

I'm new to Matlab
I need to fit a surface to my observed data in order to
find a polynomial equation of the surface.
I have (x,y,z) data.

a= 80;
csvwrite(num2str(a), [2]);
the result = 80.dat
what can I do so that the file name can be 80_1?

This one has me going crazy... Can you guys think of a way
to vectorize this? The goal is to get B.
A = randint(N,T*(T+1)/2);
B = zeros(N,T);

I have rewritten this program to calculate En and Ep at
every single point.
After modifying the program,
even I have same problem

i have images of raisins of brown, yellow and green. I have
to sort that images in above colors. Each image having
single raisin. For that i have to write a Algorithm in
matlab. Please tell me how i can do this.