Matlab

Multiplying row matrix elements
Hi all, I need any help on this. Suppose you have, A=[1 0 0;0 1 0;0 0 1]; B=[1 0 0 0 0 0 0;0 1 0 0 0 0 0;0 0 1 0 0 0 0]; and you need to get the product of each row element of matrix A by the corresponding row of matrix B, such as: C=[1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 ... 1 Jul 2010 05:35

need help with Mex file entry point is missing.
I know almost nothing about mex etc, but I need to use the SDPT3 optimization tool. I managed to install it yesterday and run the demo file sqptdemo.m, to check if it is working. However, now the problem occurs: " sqlpdemo Mex file entry point is missing. Please check the (case-sensitive) spelling of mexFunct... 30 Jun 2010 02:10

using symbolic toolbox
Hello, there. I have a problem in using matlab symbolic toolbox. Here is the question. Let's imagine that we want to have the abbreviate expression for the complex expression. For example, the complex expression is shown below. U=2*(a*x+b*y+2*c*z) + (a*x + 3*b*(y^2)) Here, all the variables (a, x, b, y, ... 4 Jul 2010 14:27

change the combination of multiple symbolic variables into one symbolic variable
If we want to use one symbolic expression co1, which is co1=a*x+b*y+c*z, in the complex expression such as U=-2*(a*x+b*y+c*z) + etc...., what should we do? (Here, a,x,b,y,c,z, etc are all symbolic variables.) There, I want to have the abbreviate expression for U as U=-2*co1 + etc... Thanks ... 29 Jun 2010 23:59

Realtime Windows Target causes Blue-Screen-Of-Death error
Hi friends, Regarding this problem, I found another detail: It seems that my computer can't handle any sampling rate smaller than 1 ms. With sampling rate 1 ms, sometimes I see the bluescreen, sometimes not. With sampling rates smaller than that, the computer just freezes and I need to force it to restart by press a... 30 Jun 2010 04:20

Integration - Singularity without reason
Hi all! I have a program in matlab which essentially should do following: P=1; syms x; for k=1:10 norm = quad(@(x)P.*(cos(m.*x)).^2, 0, pi/2); P = (P*(cos(m*x))^2)/norm; display(norm); end; But it is not working: ??? Undefined function or method 'isfinite' for input arguments of type 'sym'. Can someo... 29 Jun 2010 23:59

Looping in MEX vs Looping in Matlab
I have a mex function that operates on a vector. In matlab i call this function for 3600 columns in a matrix in a for loop. This takes about 40 seconds. In order to test moving the loop intto c I altered the mex function to run 3600 times (i call the mex function with only 1 column in the matrix, so I did not change th... 30 Jun 2010 03:15

How to use a popup menu value inside a function in a GUI?
Hi all, I'm building a GUI and I'm having an issue using a value from a popup menu inside a function. Any ideas why is not working? See below: function simple_gui hpopup = uicontrol('Style','popupmenu',... 'String',{'Cold','Hot'},... 'Position',[350,20,100,25],... 'Callback',{@popup_menu_Callbac... 30 Jun 2010 14:14

Matlab GUI uitable help
> I am having the same problem Fei is/did. I don't see 'the little yellow square with crosshairs icon' I see, and I am guessing she does too, an icon identical to the create table icon form guide. Though after guide had been open for a while those icons, and functionality, did change to what you are talking about. ... 29 Jun 2010 21:48

mmreader and DirectShow filters
I'm using MatLab 2010a on Windows 7 (x64), and trying to read in .m4v video files one frame at a time for processing. I understand mmreader uses DirectShow filters to process multimedia objects. I've installed ffdshow (64-bit) and check that it works on my video files via Media Player Classic (64-bit). Yet Ma... 29 Jun 2010 21:48