Math Forum / Math Software / MATLAB / July 2008

Dear reader,
I build a model in Simulink and would like to estimate
parameters based on measured data. I found the
tool "Simulink Parameter Estimation". In the help document,

Hi ppl!
Hi have the following code which meshes a circular section
defined by yours truly :)
The 16 points that i coded for the boundary must always be

I meet a great problem with my mex-code in Fortran. I don't think I've
made any error. however after compiling, matlab cannot find this mex-
function.
for example:

i was testing out cell arrays and did this:
x = [1;2;3;4;5;6;7]
y = [1;2;3;4]
z = [1;2;3;4;5]

I would like to create a matrix in which each column is a function of the
previous column.  It is probably easiest to describe what I would like to
do with the following code :
M  is 20 x 100 matrix

I would like to produce a plot composed to two components.
First, a usual surface plot (eg. surf(X,Y,Z) )
Second, I would like to have a line plotted on the X-Z plane
of the previous plot, but with a second Z-axis.

I am very new to Matlab and need some help editing acoustic
room impulse responses together in Matlab.
What I have is a 24 sets of 40 impulse responses in WAV
format. What I need to do is to take the early reflections

I am using the fopen command but ran into some syntax
difficulty;
i read in the file name from a text file like this:
id = fopen('D:\Files.txt')

I'm interested in using Markov chain Monte Carlo to generate variates
from the inverse-gamma distribution via Metropolis-Hasting algorithm.
Below is the code I typed but I feel that the results after running
seem inappropriate, i.e., histogram does not follow inverse-gamma pdf.

I am studying function "rstool" to learn how it does the
regression. As I use "edit rstool" to see the code, on line
202, it uses function endfit. But when I want to look into
this function, I couldn't get into it. I tried to type the

While reformatting some code, I discovered that Matlab
refuses to allow a counter variable to be part of a
structure.  I know this isn't something people should really
have any reason to do, but I couldn't find anything in the

Hi, I'm new to creating GUIs;  I wanted to know if it was
possible to create a pause button for my simulink  
simulation on a GUI.  How would I implement this code in my
GUI?  Thanks for all your help!

I'm trying to re-compile some legacy code on a new Mac Pro
running 10.5 (I don't think this is relevant).
Unfortunately, I can't even compile yprime.c.  Any thoughts?

Hi. I have a GUI that contains a plot, which I'm trying to
be able to save as a PDF at the click of a button. It isn't
working perfectly, however. A PDF is created with the
correct plot and all, but the position/size of the plot in

So I have a matrix A.
Elsewhere in my code I generate a vector x and vector y, for
example
x = [1 4 2]