Matlab

Recover positions in a vector\
Hi I want to recover the original position of element example A = [3; 4; 5; 6; 7; 8] B = [true;false;true;false;true;true] C = [2; 3; 4] A is the original matrix. B is the element that are taken from A, i.e. temp = A(B,:) = 3 5 7 8 C is the position of some desired element in B, i... 6 Mar 2010 02:07

polygon simplification
how to reduce the points in polygon ... 6 Mar 2010 10:44

How do you read time data from xls files?
Example: I created an xls file 'times.xls' which contains only: 10:30:40 01:56:04 12:26:44 xlsread gave me this: 0.4380 0.0806 0.5186 What does that mean? I know there's a linear equation (y = ax + b) that can representate them.... but... how does it work? ... 5 Mar 2010 22:54

large matrices
Hello, I have a problem associated with the size of my matrix, which needs to be in 3D for 12000 given coordinates.. when i try to run my code, I get an error saying "Maximum variable size allowed by the program is exceeded." What can I do? Thank you! A ... 6 Mar 2010 19:34

Getting rid of this for loop
Hi Folks, I have the following problem which i solve using for loop, but it is very slow that it is defeating the purpose of my whole implementation :( so your help is highly appreciated I have a 4 vectors "Labels" of values 1 and -1 size mx1 "weights" has weights (random numbers)for ... 8 Mar 2010 13:02

uniform grid on two points
I need to create a uniform mesh grid (2D) out of these two coordinates and it should be 5 by 5 feet, mesh grid cell is square : x y 1. 853630.85 14784881.97 2. 855017.29 14783988.55 Can you please tell me which matlab function can do the above. ... 5 Mar 2010 17:20

chaning a part of cell arrays
Hi I have the following three arrays: A{1}='abc_12341'; A{2}='abc_21313'; A{3}='abc_13511'; Here, I'd like to change abc to def. How can I do this without using "for..."? I tried this but not wored: A{:}(1:3)='def'; Thanks! ... 5 Mar 2010 17:20

MATLAB Programming of Multiple regression
Hi!.. I am having a hard time doing a program regarding Multiple regression,wherein the user is prompt to input the independent variable(x1,x2,x3,...xn)as well as the dependent variable y. I can only do it with 2 independent variable,but I can't function it anymore if I try having three and more independent vari... 5 Mar 2010 18:28

Help! Multiple regression specifying different functional forms
Hi all, I am trying to develop a multiple regression model for a dataset. I want to specify different functional forms for certain explanatory variables in my model, such that I could have something like the following: Y = p1*x + exp(p2*x2) + p3*x3 + p4 where x and x3 have linear responses on Y but x2 has an e... 5 Mar 2010 17:20

Out Of Memory error
How can i avoid Out Of memory error when learning Multi-layer perceptron having 39 inputs and 80762 feature vectors.? ... 5 Mar 2010 17:20