Matlab

PORTALLOC PROBLEMS
I am trying to do a portfolio optimization with real data from yahoo finance. The portalloc function doesn't seems to work. I tried with different assets. It always says : ??? Error using ==> portalloc at 199 Unable to compute indifference curve tangency portfolio. ... 23 Jul 2010 15:49

precisions problems with conhulln
Hello everyone, I am using the convhulln function in order to approximate the price of an American option. There's a hole program between the use of convhulln and the final output, which is the price of the option, but the thing is, when I vary the value of one parameter of m y function, the price explodes (values... 17 Jul 2010 17:24

Fair comparison between time domain equalizer and OFDM
Hi All So far I have worked on time domain equalizers such as LE and DFE. Recently I have started to work on OFDM systems. And I am trying to compare the performance for Proakis channel B which is three tap channel. First system: map the info bits to BPSK, pass the symbols through channel, add noise. The chann... 16 Jul 2010 13:13

DWT 3Dplot
Hello everyone: I am trying to do a wavelet analysis using DWT. Is there anyway, I can do a 3Dplot for coefficients of DWT. I have done 3Dplot for CWT. Forgive me if it is dumb question. ... 16 Jul 2010 13:13

duplicate index vector update
Hi all, Does anyone know a quick way to do something like a([2,2,2])=a([2,2,2])+1; and get a(2)==3 (assuming it was initially 0) as opposed to a(2)==1. Sorry if this is an FAQ but my search of the archive didn't come up with the answer. Brad ... 16 Jul 2010 14:20

variable size inputs/outputs
Dear all, I built a simulink model where I used an embedded matlab block in order to integrate an algorithm. The input and output of this block have variable size. If I run it, simulink doesn't give me errors or warning either if I set the input and the output of this block as if they have variable size or if I don't... 16 Jul 2010 12:06

PCA dimensionality reduction / component identifications
Hi everybody, I have a question regarding the reduction of dimensions with pca (princomp command in Matalb). The reduction itself is not the problem, but I could not figure out, how to indentify the original features, that are actually important components and the one that are not important. Small example: I crea... 21 Jul 2010 01:35

kmeans error message
Hello all, I have the following problem with kmeans. When I use it , I get the error ??? Undefined function or method 'kmeans' for input arguments of type 'double'. Even if I run the the following example in the Help of K-Means Clustering I get the error: load kmeansdata; dx3 = kmeans(X,3,'distance','city... 16 Jul 2010 14:20

remove row if contains NaN
"Sean " <sean.dewolski(a)nospamplease.umit.maine.edu> wrote in message <i1pr40$470$1(a)fred.mathworks.com>... "Natalie Sin Hwee " <sin.ng09(a)imperial.ac.uk> wrote in message <i1pqh4$pmj$1(a)fred.mathworks.com>... Dear Mathworks users ^^ I have a matrix of 800x2 1 NaN 1 NaN 1 NaN 1 NaN ... 16 Jul 2010 15:27

image processing
How can I make my own 'Rotate 3D' in GUI ... 16 Jul 2010 12:06