Math Forum / Math Software / MATLAB / July 2008

I have an m-function that uses persistent variables to store internal
states.  I'd like to be able to call multiple instances of this
function with their own internal persistent variables.  Is there an
expedient way to do this?  A possible but inelegant way would be just

Hi
I have a graph
x=[1 2 3 4 5 6 7 8 9 10];
y=[1 2 3 6 5 7 7 8 8 9];

I am new to Matlab, and I am wondering if someone here can
help me with scatter plots.  
I have some code that computes some energies, etc., and I
created a simple scatter plot of a dependent variable

I have two arrays:
A=[1, 2, 3, 4, 5]
B=[2, 4, 6, 7, 11]
I'd like to make a linear regression between A and B, but

I need to do something similar to this:
a=1;
b=zeros(1,5);
b(2:4)=a;

Is there a way to use the built in property inspector to
modify the properties of your own user-defined class objects?

Dear Matlab -
I am using Mac OS X 10.5.2 and am compiling my own MEX files. After
recompiling my MEX files (using a make file outside of Matlab), Matlab still
executes the first version of the code rather than the recompiled version.

Does anyone know if it is possible to extract data from
a .fig file, such as a .fig file containing a scatter plot
with 100,000 data points?
Thanks so much!

I have a license for MATLAB only and would like to create a
stand alone exe to run a time consuming program. I looked
online and found the mcc method but I don't have a license
for Matlab compiler. If I can't use mcc, can I create a

I have a set of microcontrollers for electrophysiology that
I would like to create a MATLAB GUI to control them from. I
know communication between a PC and the controller is
possible as the company has put out a crude program which

Hi, I'm trying to create an analog input object using analoginput. But the follow message always appears.
??? Undefined function or method 'analoginput' for input arguments of type 'char'.
Furthermore, when I type daqhwinfo,
??? Undefined function or variable 'daqhwinfo'.

I am trying to convolve a sine wave with a random signal.
Instead of using conv function, I am multiplying them in the
frequency domain and then taking the ifft. I have taken care
of the zero padding issue in the time domain. The problem is

Today morning I've just edited one of my GUIs, and after I
finished that I tried to use it, as normal. But this time I
couldn't. If I try to run a GUI (any of the GUIs, included
built in), I get error messages like this:

I am making a GUI and I want the user to be able to save a
uint8 array as a jpeg.  I want to prompt the user for a
directory/filename as in UIsave, but save the array as a
jpg.  Imwrite does exactly what I want, but is there a way

I have a matrix with 5 columns and n rows. I want to find
the minium number in column B before the numbers become
negative. Then I want to find the corresponding value in
the matrix in column D & E at the last positive number in