Matlab

problem related to for loop
i have a function abc=XYZ(N,k,R,eta); for example... its gives p=N*R^eta/k; q=N^eta/k*r; now k, R and eta are constant. N=[10 20 30 40]; for i=1:4 abc=XYZ(N(i),1,8,4); O(i)=p; S(i)=q; plot(N(i),S(i),'*') hold on; axis([0 250 199 200]) grid on; subplot(2,1,2) plot(N(i),O(i),'*') axis([2... 8 Jul 2010 09:08

MATLAB speed up
Hi, I run my own matlab code which contains 'for' loop and 'tsearchn' function. It works well, but the speed is too slow. I want to speed up my process without fixing my code. I use Dual core 2.13GHz cpu. first, I use Dual core 2.13GHz cpu. Is there any function to use dual core cpu at the same time?? In o... 8 Jul 2010 19:12

Selecting values in a vector, based on index of another vector
Hi Everyone, Suppose I have a vector of firm ID's (a sub selection of the entire population) firm_id_selection = [1 3 4] and I have another vector of firm prices for each firm in a population (in this case there are 5 firms in the population): firm_prices_all = [10.25 11.00 9.75 22.50 10.99] QUESTION: Ho... 8 Jul 2010 11:22

best fit sphere and finding its center
hi, i have (X,Y,Z) coordinates of a GPS receiver mounted on a telescope.which apparently forms half of a sphere.as GPS data are not 100% precise thus i cant get accurate surface of the half sphere. therefore i need to fit the points on the sphere. how do i get the best fit sphere and center of it. regards taaj ... 8 Jul 2010 09:08

help on ga tool in matlab
I'm using Matlab GA tool for my Research on feature selection. as i run the tool each time i get different set of features. is this correct? is there any connection between ROC curve and accuracy as i use lssvm in matlab? ... 8 Jul 2010 06:57

Question: GrayGomatrix Offset paramenter explaination??
"Do " <ngockhanh0302(a)yahoo.com> wrote in message <hqhko3$ie0$1(a)fred.mathworks.com>... Can anybody answer my question please? I really need to understand this crazy thing. Set the GrayLimits to [0 8] and check out the glcm ... 8 Jul 2010 05:53

Load time series in matlab matrix
Hello, I have a problem, that i don't how will be solved. I must load time series data in matlab matrix. The data are sampled at 5 hz, and there is a reference time t0. my idea is to use the reference time to calculate the position of the first sample: N2=(z2.sec+z2.mn*60+z2.hr*3600)/z2.tau where N2 is the po... 15 Jul 2010 10:56

z-transform on pixel data
Hi everyone, In the following code I am trying to divide an image into 8*8 blocks and then in each block I am treating every row as a sequence of samples in order to find its z-transform. The resulting data is processed through several stages and then we take IZT. Pls let me know how I can take the z-tranform of eac... 8 Jul 2010 04:48

problem with opening MatLab editor
Whenever i try to open an m-file in MatLab editor, i get the following error message in 'cmd'. 'emcs' is not recognized as an internal or external command, operable program or batch file. Does anybody know how to fix this? ... 8 Jul 2010 06:57

Drawing n random numbers from vector without replacement
Hi Everyone, Suppose I wish to draw 2 numbers at random without replacement from vector A A = [1 2 3 4 5 6 7 8 9 10] Which command will let me do this in Matlab? Best, Ulrik. ... 8 Jul 2010 06:57