Matlab

solve systems of nonlinear equations
In my previous post, I used fsolve. It seems that sometime the root converges to negative values, which do not make physical sense in the problem I am working on. So if I constraint the roots to be positive, does this mean that I have to use fmincon instead of fsolve? Thanks a lot ... 14 Jun 2010 11:45

rotate a matrix with dimension m,n,p. (image the density of a3D box)
andy zhu wrote: "andy zhu" <chenhui.zhu(a)colorado.edu> wrote in message <hutn30$jto$1(a)fred.mathworks.com>... Dear ALL I have a 3-D space, there are m, n, p points along x, y, z respectively. at each (x,y,z), there is an density, I(x,y,z). Physically, it is like a density map inside a 3-D... 11 Jun 2010 18:08

reshape a vector , split a vector
Dear Jose! noise = 1 1 1 1 0 0 0 1 1 1 1 1 0 0 0 1 1 1 0 0 0 1 1 1 1 1 1 1 round(length(noise)/3)=9 x=reshape(noise(1:27),9,[]) x = 1 1 0 1 1 0 1 ... 11 Jun 2010 18:08

help with ramp signal generator in buck converter's control
I have a buck converter circuit designed in simulink. Everything is working fine, except that with the ramp signal generator. In Simulation>>Configuration Parameters>>Solver, there are two options to be fixed: 1) Type: Fixed State 2)Solver: Discrete (Not continuous type) But with these options selected the rest of the... 14 Jun 2010 12:52

Sprintf with cell arrays
Hi all, I'm running into trouble using sprintf to display data when I have a cell array of strings. For an example, let's say I have: a = {'one' 'two' 'three'}; b = [1 2 3]; I'd like my output to say: one = 1 two = 2 three = 3 but when I try: sprintf('%s = %d\n', a, b) It gives me an error abo... 12 Jun 2010 09:20

reshape a vector , split a vector
Hello to everyone, i have got this vector and i want to split it in blocks 0f 3 elements: noise = 1 1 1 1 0 0 0 1 1 1 1 1 0 0 0 1 1 1 0 0 0 1 1 1 1 1 1 1 round(length(noise)/3)=9 x=reshape(noise(1... 11 Jun 2010 18:08

real time analog input and output
hello, i'm trying to get a code which will continuously sample an analog input (microphone) and then output the sample to a speaker. i'm trying to do it using 2 TimerFcn, one for the input and one for the output, but only one of them is working (the last). i also tried doing it with one timer function but i keep get... 11 Jun 2010 18:08

convert into adjacency matrix
"us " <us(a)neurol.unizh.ch> wrote in message <griqqh$4ah$1(a)fred.mathworks.com>... "Marat" I have a set of points (obtained using another tool) which I need to represent in the form of an adjacency matrix so that I can view the connectivity between these points. For e.g. 5 2 6 9 4 7 3 3 1 6 2 5 8 4 ... 11 Jun 2010 18:08

GUI appearance speed
Hi, I'd like to accelerate appearance of my GUI on screen. Now it takes about 3 sec on my computer (desktop) and about 5-6 sec on another (notebook). My GUI consists of 3 dozens panels with controls and I turn on only those which I need (in OpeningFcn). During the first appearance I can see that panels are show... 12 Jun 2010 14:52

Coordinate transformation - cylindrical to cartesian
hi, Recently i have problem in plotting a function. here it is E_i = (E_x, E_y,E_z), components of a vector in Cartesian. Each of the component is a function of cylindrical coordinates, ie.,E_i is 3-d matrx . I want to plot these components in Cartesian planes - XZ,YZ. I could get XY from pol2cart command. Can any o... 11 Jun 2010 17:00