Matlab

Can ODE solve this?
I have a differential dI/dz which depends on I(t,z) and N(t,z). I(t,z) and N(t,z) are vectors with varying element values...ie. their initial conditions are also vectors. The ODE's only want conditions with single element vectors. Any suggestions to functions or methods for this problem? ... 15 Apr 2010 06:56

I want to create a m-file by command: edit filename. something wrong!
In past, I wanted to create a m-file by type command "edit filename". If filename is not exist, matlab would create it in automatic. Today, I use "edit mathworks.m" to create file, it tells me File 'mathworks.m' not found. How to solve? THS ... 14 Apr 2010 15:33

MATLAB and USB
I want to design a simple circuit which is interfaced to PC via USB. Say, for an instance a group of LED's, and I wan't to switch on/off each LED via MATLAB? Is it possible...please help me.......... ... 14 Apr 2010 13:18

sisotool doesn't cancel pole-zeros combinations?
I just read this and want to know if it's true, "If you look at the transfer function closely, you will notice that there is a pole-zero cancellation at the origin Matlab does not automatically cancel the pole and zero. As a result, it can cause confusion in the root locus plot, so it is best to eliminate it now." ... 16 Apr 2010 20:40

Watermark extraction query
clear all pack all close all; clc; i = imread('cameraman.tif'); imshow(i),title('original image'); x = im2double(i); ir = reshape(x,1,(256*256)); k =0.0002; %scaling factor watermark1 = [ 0 0 1 1 1 1 0 0, %original watermark 0 1 0 0 0 0 1 0, 0 0 0 0 0 0 0 0, 1 0 1 0 0 0 0 1, 1 0 1 0 0 0 0 1, 1 0 1 1 1 1... 15 Apr 2010 18:05

Simulink: How can I get fraction length from best precision fixed-point?
Hello, I have a fixed-point Simulink model where I use constant blocks. The constant blocks output data type is fixed-point with best precision scaling. What I want to do is to read the data type of the signal from the Matlab workspace. When I use the get_param command I get the following: get_param('my_model... 16 Apr 2010 17:19

Fminsearch X0 interval
Hello, I have an issue, I have an fminsearch function but I need to input more that one value, that is done, but as I run the function X0 goes out of bound: x0=13.0e-3:0.1e-3:13.5e-3 options =optimset('Display','iter','MaxIter',100,'MaxFunEvals',40,'OutputFcn',@outfun) [y,fval,exitflag,output]=fminsearch(@(... 14 Apr 2010 13:18

xlswrite to merged cells
I have a cell array that I want to write to a cell in Excel, say 'E1'. However, for publishing purposes, this cell is merged with cells 'B1:H1'. When I write the array, it is written 7 times (to 'B1' ... 'H1'). This does not matter for the cell 'E1', but it does for other rows below this with cells that aren't merge... 20 Apr 2010 15:54

Sendmail Error
I am having trouble with the Sendmail function. I get the following Error: ??? Error using ==> sendmail at 168 Exception reading response; sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to... 14 Apr 2010 12:08

Unwrap (or expand) a cell array.
Hi, I'm banging my head against the wall trying to find a one-liner for unwrapping a cell, i.e. if c is a cell, I want to know if I can call whatever c{:} calls directly. Thanks in advance, Nick ... 14 Apr 2010 12:08