Matlab

Multi Dimensional Indexing
I was hoping someone could help me out. I'm happy enough (I think) with using something like R(R > 0) = 0; when I want to 'zero-out' all the positive elements of a vector. But how do I generalise this idea? To give a more specific example, suppose I have r = rand(4, 5, 6, 7); and I want to zero-out all t... 20 Apr 2010 15:57

PID controller using GA toolbox
Hi , I am using the GA toolbox to design a PID controller. In my fitness function I run a simulink model. The PID values are getting passed to the simulink model but for some of these values the simulation stops with the following error. "Derivative input 1 of 'ref_ctrl/Reformer/Subsystem2/Manifold Dynamics/Integ... 13 May 2010 12:41

How to extract different rows and columns from different images and then mixing them to form new matrix
hi every one i am doing face detection and for this working on an algorithm but stuck on a point that is. suppose i have a image and i convert the image into binary image and then sum the rows and columns the black areas shows the sum=0 where as the areas which are not black will shows some sum.now i want to extr... 18 Apr 2010 17:30

Video Extraction
I have a video with 300 frames but i want to extract first two and the 100th frame from that video sequence.Please help me with the code. ... 18 Apr 2010 17:30

train neural network in multiple sessions
i have a problem with huge dataset, when i train the neural network with nprtool it would give an "Out of memory" error i would ask if i can train the network partially ? ... 20 Apr 2010 15:54

need help guide ( maximize gui window) !!
If you have created a GUI using GUIDE, then in GUIDE, right click in the GUI you have created, select the 'GUI Optons...' button, click in the 'Resize behavior' dropdown box, then select 'Proportional' from the options. This activates the maximize button in the top right corner of the GUI and allows you to maximize the... 18 Apr 2010 16:23

color addition
Hello, Is it possible to do color addition in matlab. For example red+yellow=? ... 18 Apr 2010 16:23

randperm
Hi everyone, I have two matrices x=[12 1 9 6 87 43 11 98]; y=[32 44 4 5 6 7 14 11]; Say I want to randomly select a matrix z=[1 9 87 98] which is a subset of x. Also, I want the elements from y which have the same index as the elements selected from x i.e., t=[44 4 6 11]. I tried using randperm but the re... 18 Apr 2010 17:30

Adjust colorbar scale on quiver plots
Hello, I'm trying to create a quiver plot which has a representative data scale in the colorbar. At the moment the colorbar ranges from 0 to 260 but I wish to have it represent data values that range -140 to 120. I use freeze colors to overlay the original colormap (colmap) on each image as each has a slightly diffe... 18 Apr 2010 16:23

Import txt file with variable position of headerliners
Hi everyone, I am trying to import a txt file which has a variable number of rows separated by a blank line and a line with the variable names x and y. The first lines look like this: x y -0.5 0.00001778 -0.48 0.00001865 -0.46 0.00003412 ......more rows... 1.5 0.00454982 x ... 18 Apr 2010 16:23