Matlab

How do is the calculation done? MatLab gives two different values HIGH IMPORTANCE
Hi, I've got matlab to generate a equation of polynomial. a = 0.0015 -0.1084 3.8509 -35.1232 which is of order 3 i.e. 0.0015*x^3 - 0.1084*x^2 + 3.8509*x - 35.1232 when I type on matlab: polyval (a,19.13) the answer is: 9.4393 x being the value of 19.13, But when I compute the value on... 21 Feb 2010 23:49

Hilbert Transform Question of Instantaneous Frequency with code and figures
I've a very simple signal, and heard people are using Hilbert Transform to detect the instantaneous frequency (Fi). I'm new to Hilbert, and this is my first attempt. Why there are negative values shown in the plot. The Fi of the signal apparently to be 22.5Hz, which I suppose is: Sig = sin(A)+sin(B) = sin((A+B)/... 24 Feb 2010 13:07

Image processing despeckle algorithm?
Hi, I'm new to Matlab and I am wondering if anyone can recommend a basic algorithm or program for removing speckles from an image grabbed from a video? I found enhancement methods in image processing demos, but nothing that will search for and remove small speckles of noise. Many Thanks, Shaz ... 21 Feb 2010 12:37

what does x2 = "1:.1:5;" mean URGENT
Hi, If x = [1 2 3 4 5]; and I write x2 = "1:.1:5;" what does x2 equal to... I do not understand why you put 1:.1:5 Thanks ... 21 Feb 2010 09:15

PCA
Hi Alaa, i am Aditya .. for my final year class i need the source code for Face recognition using PCA in MATLAB.. my email id is dabbiru.aditya(a)gmail.com.. awaiting ur response.. "Alaa Tharwat" <engalaatharwat(a)hotmail.com> wrote in message <g056e0$lp$1(a)fred.mathworks.com>... Hi, all I'm Alaa from Egypt. I... 22 Feb 2010 04:09

quadruple integral
Hi. I have some difficulties to set a "m" function (I've just written a variant of triplequad.m) . Its aim is to solve a quadruple integral. Unfortunately when I try to pass it a 4 variables function: a=@(x,y,z,t) x+y+z+t; A=quad4(a,0,1,0,2,0,3,0,4) the script don't works: function Q = quad4(intfcn,xmin,x... 21 Feb 2010 08:09

quadruple integral function
Hi. I nave some difficulties to set a "m" function. Its aim is to solve a quadruple integral. Unfortunately when I try to pass it a 4 variables function: a=@(x,y,z,t) x+y+z+t; A=quad4(a,0,1,0,2,0,3,0,4) the script don't works: function Q = quad4(intfcn,xmin,xmax,ymin,ymax,zmin,zmax,tmin,tmax,tol,quadf,va... 21 Feb 2010 07:04

Java graphics in Matlab
Hi, I have a Matlab gui. It reads in data, and then it calls a function to create a Java Frame. Now, I have the frame appearing fine, the problem is when I try to draw anything onto it, I just get the error %%%%%%%%%%%%% ??? Attempt to reference field of non-structure array. Error in ==> show_manuscrip... 21 Feb 2010 13:45

how to find this curve length
Hi, I got 11 group of xyz values. X: 0mm Y: 235.69mm Z: 85.24mm X: 0mm Y: 267.97mm Z: 73.95mm X: 0mm Y: 291.67mm Z: 49.29mm X: 0mm Y: 303.98mm Z: 17.39mm X: 0mm Y: 305.59mm Z: -16.77mm X: 0mm Y: 302.03mm Z: -50.79mm X: 0mm Y: 285.44mm Z: -80.7mm X: 0mm Y: 257.99mm Z: -101.09mm ... 21 Feb 2010 05:59

resize array
"Young Ryu" <ryuyr77(a)gmail.com> wrote in message <hlq4rf$9vl$1(a)fred.mathworks.com>... Hi I have an array: A=rand(1000, 1000); I'd like to resize to 25% size (thus 250 by 250) using average. I usd resizem funciton, but it was quite slow. Could you recommend the fastest way to resize array? =============... 21 Feb 2010 03:50