Math Forum / Math Software / MATLAB / July 2008

Hi,
I am using the function anovan to do a multi-way anova. It
is clear how to do this when group factor is defined.
However, suppose my group factors are stored in a matrix A,

I am writing some OOP code in Matlab and I wonder if there
is any way to specific a function from the Matlab built-in
class.
The reason why I want to do this is because I want to be

How to find the average gray level of the histogram?

I was wondering if MATLAB was able to directly support TWAIN
image acquistion devices without creating a generic MATLAB
driver.
Thanks,

i have a base band frequency domain impulse response that i
need to transform to the time domain.
it is in the form of two vectors one containing the real
part and the other the imaginary one.

I finally solved my 3-D plotting problem from earlier. Now
the  down side is: the calculation takes about a day on my
2GHz, 2 GB DDR2 RAM machine. I guess it is due to all the
for loops in the calculation. I tried to vectorize the

I have been using a peak detection m file from
http://www.billauer.co.il/peakdet.html. The code is shown below.
Does anyone know if its possible to vectorise this function
as it currently uses for loops? and if it is, could you show

I think I have found an error in the documentation for FFT
(doc fft).  The line where the frequencies are computed
looks like this:
f = Fs/2*linspace(0,1,NFFT/2);

Is there any matlab program that I can input .txt files of
varying amplitude data plotted against time.  I need to
measure the amplitude of the peaks and determine the
baseline and maybe define a thresold.

Does any one by any chance know how to extract the
uncertainties associated with the parameters returned by the
fitting procedures in ezyfit? E.g. if one is fitting data to
a function such as y=k*x+b, then one would expect the result

I am trying to estimate GARCH(1,1) parameters (without
GARCH toolbox) using maximum likelihood methods and have
the following error:
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

I'm trying to arrange a struct, but can't seem to find a
good and quick way.
I'm using

I am trying to compile some mex files written in fortran,
and am getting the following error:
LIBCMTD.lib(toupper.obj) : fatal error LNK1112: module
machine type 'x64' conflicts with target machine type 'X86'

In my GUI if the user selects a checkbox there are two plots
that I need to show, whereas if the checkbox is not
selected, I want to show just one plot.
I placed one axes in GUIDE and when I had two plots I just

I have been writing a gui to deal with potentially dozens
of files at once.  I would like to save each of the plots
I generate automatically.  I have added what I believe are
the critical parts of the code below.  My problem is that