Math Forum / Math Software / MATLAB / July 2008

I have a model that I saved a previous version of for
backup purposes.  I made a few changes, such as adding a
PSK modulator rather than inputing the signal from the
MATLAB workspace.  I also added a few mask parameters to a

I am working of 3d representation of molecules and
encountered a problem.
I have 3 points in 3d:
X = (xi,xj,xk) Y = (yi,yj,yk) Z = (zi,zj,zk)

Is there a way to extract the line/curve of intersection
between two isosurfaces (or more generally two patches)?
This would function as a quick and dirty empirical solver
as well as adding the ability to highlight the intersection

I am having trouble loading a user defined colormap into a
gui I am working on.
I have saved the custom colormap, and can load it just
fine into the normal Matlab workspace.

I hope that all is well.
Can you help me with creating plots in Matlab?  I have
some data held in Matlab, and I would like to plot it
several ways.  For example, suppose I want to create

.. using either 'old' or 'new' (undocumented) syntax.
New:
 classdef mydatabase < database
 end

Im having some trouble with a compiled matlab program and a
timer.
heres my code.
function [outputArgs] = program(inputArgs)

Folks,
I am trying to create a 3d rectangle with rounded corners,
using patch command. So, i have like 404 points for defining
a plane most of them for creating the round smooth corners.

how we take using the matlab commands the y,cb,cr values
respectivelly  in 4:2:0   and 4:4:0   formats .
That means from a RGB Image I need the ycbcr image  in the
above formats.

The following is the code to find the area and internal
angles of a triangle.
function [area,an]=trian(x1,y1,x2,y2,x3,y3);
m=det([x1 x2 x3;y1 y2 y3;1 1 1]);

I am attempting to fit an arctan curve, as a background fit, to a set
of data.  I've read in the help manual how to fit polynomials and even
logarithmic functions, but cannot find anything on fitting an arctan
graph to data.  I was wondering if this is at all possible, and if so

I created a simple GUI with GUIDE. It includes a listbox
and a pushbutton. If I start the GUI every time the first
element of the listbox seems to be selected. It seems so
because the first element is marked blue.

[CLASS,ERR,POSTERIOR,LOGP,COEF] = CLASSIFY(...) returns
COEF, a structure array containing coefficients describing
the boundary between the regions separating each pair of
groups.  Each element COEF(I,J) contains information for

I have an N x 1 vector (A) and I would like to calculate sums of various
ranges of that vector.  The ranges to be summed are defined by an M x 2
matrix (B) which holds beginning and ending indexes into the vector (A).
For example the following data :

I have finally finished my program which imports all the
data needed from a 5000 line .txt file. it takes about 6.5
seconds to do one file!  I found the code metrics function
from the file exchange tool box.  I ran it and found that