Matlab

retain certain pixels in image
Hey! I am also new, but can't you use A=imread('...') and then B=A(1:5 1) Oder something like that (in a correct syntax.... ;-D) Cheers, William ... 7 May 2008 13:25

Displaying "some more" vectors...
Hello! I was just wondering if there are any tricks to display "large" amounts of vectordata in Matlab? I recently tried to use quiver3 on a dataset with 64000 datapoints for each x,y,v,u,v,w. It took ages to display one single Plot. In Tecplot360 I can rotate and zoom my dataset in real-time. Is this also possib... 7 May 2008 13:25

intensity mapping
Hey there, I'm trying to map a 2-dimensional plot in conjunction with color representing the intensity of a particular field position from a given origin. It would be great to put this on a physical world map, but I'd settle for a simple plot as a consolation. I'm offered the following vectors containing ... 7 May 2008 13:25

retain certain pixels in image
I'm new to image processing in MATLAB, so bear with me. =) Is there a way to retain parts of an image, say of size 5 pixels by 1 pixel? I've tried a number of different functions (mostly through trial and error) but can't seem to find a way. It's a colored image. Do I have to convert it to black and white or ... 7 May 2008 13:25

impulse response of halfband filter design
I am trying to use fdesign tools to have half band FIR filter design with the given example. Frequency response looks good but I had a hard time to get the impulse response displayed. Here is what have done: d = fdesign.halfband(.01, 80); designmethods(d); design(d,'equiripple'); d = Respons... 7 May 2008 15:04

load shared library on GLNXA64 computer
Dear all, I have received an external fortran library with matlab wrappers. It works fine on a linux32 bit architecture but on linux64 when loadlib.m tries to load the library it checks for PCWIN|GLNX86 otherwise it issues a warning: "Warning: Shared libraries are not supported on this platform. Functions that d... 7 May 2008 15:53

Solving Ax=b for large sparse matrix(1e+6 X 1e+5) and cholinc failure
This matrix is now posted at: http://www.cise.ufl.edu/research/sparse/matrices/Rucci/Rucci1.html ... 7 May 2008 11:47

dialog/message box with time out function
I can't find a solution to my problem, but maybe I am just looking for the wrong keywords? I need to have questdlg and msgbox in a time-limited version: After a couple of minutes (or whatever) the box (or dialog) should be closed automatically (with default answer). Is there anything like that available? ... 7 May 2008 13:25

Wish List Item - Different Extension for GUIDE figure templates
I use GUIDE to create GUI layouts, then share data between functions using getappdata/setappdata using the figure handle If I accidentally hit CTRL-S while the GUI is the active window, I end up saving the contents of the plots, controls, and appdata in the fig file that is associated with the GUI. Every time I... 7 May 2008 11:47

How do you hold the legend with the figure?
I'm trying to plot multiple sets of data and am trying to find a way to add on to the legend rather than simply replacing it. For example: x=[0,1,2,3,4,5,6,7,8,9,10]; y=[0,1,4,9,16,25,36,49,64,81,100]; p1=plot(x,x); legend([p1], '1') hold on p2=plot(x,y); ????? At this point I'm not sure what to do. I w... 7 May 2008 10:08