Math Forum / Math Software / MATLAB / July 2008

I am buying either the ATI 4870 or Nvidia 280 GTX. For 3D
animations, movie creations, etc under Matlab and Virtual
Reality toolbox, which video card gives the best
performance? Some softwares recommend using Nvidia cards

Hi! I'm attempting to animate a line of variable height
scrolling across my gui Axes, built using GUIDE. Right
now, for starters, I'm just trying to get a single line of
constant height to scroll across the screen, using the

I'm not sure which is the most efficient way and 'fastest'
that would deal with these issues.
Say you have:
M= a matrix of 5x3 =[x, y, z];

I am trying to create a matrix [MxN] for principle component analysis.
My problem is that my waveforms do not all have the same vector length
N, there is a difference of 15 to 100 data points. I am unsure what
type of algorithm to use, or how in general to adjust the waveforms to

I have very large tridiagonal positive matrices (dim > 10000)
for which I need to find all eigenvalues. Matlab eig/eigs
routines are desperately slow and memory consuming. Did
anybody solve a similar problem?

suppose i have a binary image(i.e), a circle.
where the solid shape is 1, others as 0.
I have found its boundaries
Is there a function in Matlab to find the coordinates of

I have 3D array 109x91x91 and I want to multiply
submatrices (109x91) of it with other matrices, along the
third dimension. This I can do easily but I cannot figure
out how I can keep the 3D structure of the array at the end.

I followed a couple of webinars on deploying matlab
applications and I'm particularly interested in displaying a
matlab plot in a webpage in a .NET framework (unfortunately
the only feature missing in my matlab installation is the

I have built an executable of a Matlab code we have that has
the top level m-file name of fset_gui.m...  The command used
to build the executable was simply "mcc -m fset_gui"..  The
executable works but there are a list of warnings that

I have a system of four algebraic equations with a total of 30
variables, 4 of them being independent variables.
This has to be solved symbolically, none of the variables have
explicit values.

Hey all,
   I created a gui the other day, i am trying to click a
button and have the com4 port initialize(my indicator is
connected here) and press another button to disconnect.  I

I am making a GUI with some plots and simulations. It is
possible to change paramters while the program is running
and see the changes on the plots.
I would also like to visualize things with animations.. Any

we are using the clampex software (part of the pclamp package,
molecular devices, formerly axon instruments) to aquire
electrophysiological data. We have recently upgraded to pclamp 10.0.
Before that I used the function import_abf, that I found in the file

I run a fmincon and got the following error message, but I
don't know how to interpret it:
Optimization terminated: first-order optimality measure less
than options.TolFun and maximum constraint violation is

Hi everybody again,
I have to understand and run a relatively complex
application (at least for me :-) ) made by many (about 100)
m-files, distributed on different subdirectories of the