Math Forum / Math Software / MATLAB / July 2008

hi,
i am trying to find a 2D nonmonotonic interpolation.
my data is z(x,y), but again the x and the y are
nonmonotonic data.

Hello, im trying to create a 3 dimensional matrix to store
10 640x480 raster images. One set of these images i need
to apply thresholding to.
I first store the images into matrices the following way

I am loading a file of stock historical prices:
File fid is a list of (date, Price).
while fid
  tline = fgetl(fid);

Can anyone help me in vectorizing this code....
M & N are the boundaries.....
   for theta = 0:pi/180:2*pi;
       x = cent_x + radius*sin(theta);

Hey there,
I want to solve the following equation for "m". How can I
make MATLAB solve the problem? D1, D2 and A are given values.
0 = [exp(m*D1) - 1]/[1 - exp(-m*D2)] - A

I have a RTW model which runs as I want to. All I want to do is add an if block which when satisfied executes an exe file.
One way I thought of is to make a subsystem and add the following custom code c-code using the Model Source block:
#include <stdlib.h>
#include <process.h>

I've been doing a long-hours-run analysis in MATLAB in which
I used "sendmail" in several parts of the script with the
intention of having been informed about the process. It
worked superb till now.

Hi,
I'm writing a M-file s-function and I need to save an
object created in the 'setup' function in a Dwork vector to
use it in the 'Outputs' function.

Does anyone know how to turn a vector to a upper triangular
matrix?
For example, I have a vector [1 2 3 4 5 6 7 8 9 10],and
I want to turn it to a matrix

Hi, I'm having trouble trying to assign values to a 2D array
after having called mxCreateNumericArray.  I would normally
expect for the 2D array to be stored as a 1D array in column
order, but this doesn't seem to be what I'm seeing.  I've

is it possible to limit the callback function?
for example, the gui button can only be pressed for 10
times, then the callback function is not valid anymore after
10 times.

blok=[15 15];
size(r)=320 240;
fun=@(x) mean(x);
r=colfilt(double(r),blok,'sliding',fun);

Hey everyone!
So I'm trying to run a loop with regexp.  Here's the quick
program I wrote...
%---START PROGRAM---

For the sum of independend random gamma variables, I have used the exact formula of Moschopoulos (1984), which I have implemented in Matlab. The problem is that is doesn't work.
I know that the problem lies in the gamma(p+c), it approximate Inf to fast.
I don't know how to scale ...

I'm working with ksdensity sw module and I would like to
know how the width of the window is chosen; in particular,
I' working with Gaussian Kernel (the default option), I
think that the width depends on the number of samples, but