Matlab

help using ode15i
Hello I have a stiff system of ODEs where one of the equations is implicit. I am using ode15i to try to solve the system of equations. I have been getting the following warning: "Warning: Matrix is singular, close to singular or badly scaled. Results may be inaccurate. RCOND = NaN. In ode15i at 353" ... 21 Sep 2009 18:01

Phase shift in Simulink
Hello All, I am using simulink to generate phase noise. Basically I have a since wave generator and want to introduce phase noise to this. Surprisingly I haven't found a phase shifter block in simulink. I even didnt find an Allpass filter. One other related issue I have is to generate a constant 90 degree phase sh... 21 Sep 2009 20:19

Implementing FIR filters with exponential roll off
Hello all, I'm trying to design a linear phase FIR filter to a certain set of specifications, in a manner similar to the function firpm, yet subtly different. Instead of linearly interpolating between the frequency/amplitude points as firpm does, I require specific exponential slopes between them (e.g 6db/oct). ... 22 Sep 2009 14:03

how to create a zoom out plot within a plot
hello everyone, i try to plot a figure with a zoom out plot within the figure. the codes are show at the bellow, the problem is, the axes for the zoom out plot doesnt change as the limits given in the code. can anyone help me please! many thanks nan %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% clear all close all cell_... 21 Sep 2009 06:39

In an assignment A(I) = B, the number of elements in B and I must be the same.
m=5; z=1:m; x=1:(m+1); x(1)=0; for k=1:m x(k+1)= k*(1/m); z(k)=((x*(k))+(x*(k+1)))/2; end sum(z); ??? In an assignment A(I) = B, the number of elements in B and I must be the same. I get a weird msg but i dont see where i went wrong can anyone help me out. ... 21 Sep 2009 04:28

In an assignment A(I) = B, the number of elements in B and I must be the same.
m=5; z=1:m; x=1:(m+1); x(1)=0; for k=1:m x(k+1)= k*(1/m); z(k)=((x*(k))+(x*(k+1)))/2; end sum(z); ??? In an assignment A(I) = B, the number of elements in B and I must be the same. I get a weird msg but i dont see where i went wrong can anyone help me out. ... 20 Sep 2009 17:23

QPSK demodulator
Here are all type of modulations here: http://www.mathworks.com/matlabcentral/fileexchange/14410 ... 19 Sep 2009 04:59

brighten
Hi everyone! I'm facing a problem using brighten function in matlab which provides me to darken or lighter a colormap. load flujet image(X) colormap(jet) Here is a colormap. I don't know in fact how I can use function brighten to my colormap. I look in : help brighten But I cannot figure out h... 20 Sep 2009 03:00

Mutual Information Calculation
Can anyone direct me to a routine to calculate mutual information between two time series? There is one posted on the MATLAB repository, but it uses mex files and I cannot see what the code is actually doing. Thanks, ... 19 Sep 2009 15:54

using fftn and ifftn to compute distribution of multivariate Student's t
I would like to compute the distribution of X_1 + ... + X_T, where each X_t is IID multivariate Student's t(nu,Mu,Sigma), or just MVT (nu). If f is their pdf, I wish to do this by: (a) computing phi = F(f), the FFT of f; and (b) computing f_T = F^{-1}(phi^T), the IFFT of phi^T. I have two conceptual question... 18 Sep 2009 21:16