Math Forum / Math Software / MATLAB / July 2008

I have writen program similar to one given here.
it shows no error in the editor but when i run the program
it shows error, unable to understand why this error comes
and how to clear it.

I'm working with the R2008 version of matlab.
I have created a class (lets say classdef circle) and I want
to preallocate a vector of these 'circle object'. How can I
do that?

I was wondering if there is a way to search within
a matrix or multidimentional array (e.g 30x10).
This search would point out a value which has
repeated within the same column say 3 times

I want to find the solution to A*x=RHS
A=[5.742    -5.718    -0.022    793.04    -81.114    0
  0.2075    -0.2047    0    57.751    -36.543    6.7566
 -0.0032    0.208    -0.264    1.6    26.4    6.1764

Hello Matlab users,
I have questions on matrix operations and appreciate some
help.
First, I need to inverse an n by n symmetric matrix H,

I am attempting to use Matlab to output data to a
spreadsheet, and to simultaneously format that
spreadsheet.  To this end I have been using the
xlswritespec function, which I downloaded from the file

I have studied Sample Training Session in neural network toolbox.
Codes are:
load choles_all
%reset random number generator.  Otherwise, one gets different results

It could be possible to fill a 4D matrix with different 3D matrices?????
I'm trying to fill a 4D matrix with some 512x512xN matrices  where N can be 4,
8 or 16.
/  512x512x8   512x512x4   \

Another newbie question.  
How do I retain an array / variable / ... in the workspace
when it's created in a callback function of a GUI?
Thanks,

How to browse a matrix file and keep the content of it in a
memory.
if you have two matrixes

I'm reading a paper "Estimating Observation Functions in
Dynamical Systems using Unsupervised Regression" recently.
The authors claim that equation 7-9 in the paper can be
formulated as a generalize eigenvalue problem.

 I am still trying to solve a problem of removing NaN data
from my image created using geoshow. The NaN data is
visible as the lowest values from the colorbar. I changed
this to purple for better visualization:

1.  I have an n-dimension data.
2.  I could get the pdf of each one from each of their
histograms.
3.  Now I would like to get the joint pdf of the all the

I am trying to update the position of a camlight after using
rotate3d to rotate my patch data. The callback works if
rotate3d is off, but not while it is on. How can I make it
work while rotate3d is on so I don't have to turn off

when ever I try to execute the program below it gives the
following message:
--------
??? Attempted to access ev(1,3); index must be a positive