Math Forum / Math Software / MATLAB / July 2008

If you can help with the following that would be very useful;
I have several interpolated surfaces of the same region, however they
are on slightly different grids (as the loess interpolation uses the
min and max of the data set) and so the X,Y positions vary. I want to

Hi, I'm pretty new to matlab and have only used really basic
aspects so far (mostly just graphing).  What I want to do
now is draw some density contours based on how many points
are plotted in an area of a graph.  I've been looking

I want to solve the parabolic equation for mass transport at
porous region for 1 dimensional. the problem is, im confuse
to set the initial and boundary condition for my system. my
system have 5 layer of porous region. Now, im try to solve

I want to use k-means algorithm to cluster about 500,000 points into
1000 clusters. Each point has a feature description of about 800
dimensions. I simply use the following command to do the clustering
but it runs very slowly and now I think maybe it will not finally

Hi, all:
I found a demo from Matlab at
http://www.mathworks.com/products/demos/image/cross_correlation/imreg.html
Simply, I copy all the code to command window, but it seems

Have some measured data points which should make up a
sinc-function.
How can I fit a a*sinc(b*x) to my data points?
Have understood how to estimate polynomials (which would be

I'm still learning Matlab and I was wondering if there is
better way of doing this specific task:
I want to transform an ordered row vector into a matrix in
which each row is a predetermined-sized partition of the

Hi, I have multiple text strings consisting of two words
separated with a "tab" looking something like below:
one    two
now how do you do to split this string to two separate

I have this data sample and plot it in Matlab. The data is collected
from some medical experiment of mice. In the previous analyzes, we
select the threshold manually(not very accurate). Now we are trying to
program to automatically select the threshold by computer, which will

I have a mixed wav file is consist of different voices. For
example, a person is speaking and at the same time, there is
playing a song on the background of speaker. I want to split
this two different voices from this wav file and i want to

I have two arrays (2D) and would like to copy some values from array2
to array1. The exact index location in both arrays are known. Can it
be done without using a for loop? Here is the simple version of the
code that I am using. Just need to do it without a for loop. Any help

I have a series of plots appearing in the figure window in
succession, after pre-determined intervals (decided by the
'pause' command).
Accompanying these plots, are sounds played aysnchronously

okay, so i don't know if this is new or if i've just been
working to long, but, i'm using R2006a V7.20 and it appears
that MatLab's default choice for normalizing the eigen
vectors of the general eigen value problem is to normalize

I have a CT scan of an image of bone.  I want to analyze the
outline of the bone.  I've tried to use bwtraceboundary and
imfill and both work.  
The problem is that due to quality issues the bone images in

I have an array of string values:
x=['test1' 'test2' 'test3']
When I refrence x(1) I get back a value of t. How do I get
MATLAB to return 'test1' when I type x(1)?