Math Forum / Math Software / MATLAB / July 2008

I am trying to use a DLL from a C program.  Most of the
functions have Boolean outputs, but Matlab does not seem to
be able to handle the data types.  In the mfile generated
from the 'mfilename' option of loadlibrary, it lists 'error'

Did I misunderstand the use of field and structure?
Can someone point out my mistakes please.
%% PLAY AUDIO
function select_audio_Callback(hObject, eventdata, handles)

Dear friends,
when wavelet toolbox menus(wavemenu) run it doesn't show
the commands which run in the command window at the same
time.if there is a way to see the commands could you tell

I would like to make a function such that:
function [] = PullInVars(???????????)
and i want it to pull in all the variables from the main
function... is this possible?  there are 25 or so

Hello Group,
I have a strange problem: the debugger symbols in the Matlab text
editor have become invisible. The "red dot" break point glyph and the
"green arrow" program counter glyph no longer appear in the margin

I have several vector variables that range in size:
<480x1>, <244x1>,<267x1> and so on.  Instead of compileing
all of these variables into one 1 large matrix then saving;
is there a function that can do this without the

Anytime I do something with a figure, i get this error:
java.lang.NullPointerException
    at
com.mathworks.jmi.bean.MatlabBeanInterface.addCallback(MatlabBeanInterface.java:680)

   I am wondering if you can set the operating precision
in Matlab.  There is a function called single(var) which
sets the precision for var.  However, is there a way to
set it for all operations in Matlab?  I need to double

Suppose I have an [m,n] matrix. how do i get the (I,j)
index of the first cell in column j with a value > larger
than say x.

I have some problem about mex f90 source code (Compaqe Visual Fortran 6.6)
with Matlab 2007a. My code is contained with 15 modules which are related
each other. For example, I have module  1, 2 ,3 and 4. Mexfunction uses
subroutines in module1, 2 and 3 respectively, and module 3 ...

I am calling a lengthy C++ program(dll) from MATLAB with the
calllib function.  I would like to display a dialog box with
a progress bar that updates as the C++ program executes.
The length of time for the C++ program varies so I never

I am starting to use Fixed-Point Toolbox, within an Embedded
MATLAB Function. I noticed that, since M code does not
support type definitions for variables, the
ProductWordLength attribute in the terms of an equation (its

Solving a system of nonlinear equations
Hi all,
I have an algorithm that outputs 5 nonlinear equations with
x,y and z as unknowns. e.g. aX+bY+cZ=W

i'm the very beginner of MatLab and would like to rise
a one question bevor considering more effort to learn matlab.
It's going about figures witch are in other computer lanquages
being addressed as integer types, like in VB, without a

 I have been struggling to figure out how can I use a
numerical vector as a polynomial function and use it to
implement in quad().
Here is what I tried: