Matlab

how can I get velocity and acceleration from angular position signal.
Hello everyone I would like to know the best Matlab function I could use in order to get velocity signal and acceleration acceleration from only the angular position signal. I kbnow that theres' methods like gradien, diff, but I don't get good results It's so important to use a function that could help me a velocity... 16 Jun 2010 06:40

Rewriting cursor data results in freeze. Please help!
Hi, I'm writing a program that will allow a user to plot a x vs. y text file and select a point on the plot using the cursor data function. The user then saves the cursor data to the workspace and can then open a new text file and see where the point they previously selected is on the new plot. This part is working p... 14 Jun 2010 11:45

find the wheel centre and radius in pixel
here is my wheel pic http://i47.tinypic.com/k06jib.jpg how can I find the centre and radius for the wheel(size of wheel) only the steel(what) part of wheel,not include tyre. I've been try to used the Detect circles with various radii in grayscale image via Hough Transform but not really work, can someone ple... 14 Jun 2010 11:45

find the wheel centre and radius in pixel
here is my wheel pic http://i47.tinypic.com/k06jib.jpg how can I find the centre and radius for the wheel(size of wheel) only the steel(what) part of wheel,not include tyre. I've been try to used the Detect circles with various radii in grayscale image via Hough Transform but not really work, can someone ple... 14 Jun 2010 10:38

find the wheel centre and radius in pixel
here is my wheel pic http://i47.tinypic.com/k06jib.jpg how can I find the centre and radius for the wheel(size of wheel) only the steel(what) part of wheel,not include tyre. I've been try to used the Detect circles with various radii in grayscale image via Hough Transform but not really work, can someone ple... 14 Jun 2010 10:38

set y-limits for new figure
Hi all, I have a problem when setting the y-limits for a new figure. I have made a gui with guide where I have an axes and some other stuff to plot things on that axes. The thing is that the user can interactively change the limits of the axes (that works fine by changing the xlim and ylim), but then there is the... 15 Jun 2010 03:15

Which LAPACK routines are _actually_ used (for A\B and B/A)
Hi there, is there a way to monitor which LAPACK routines are actually called when using the Matlab mldivide(A,B) and mrdivide(B,A) functions? I know that the documentations tells which routines are callled depending on the type and structure of A and B but i don't want to check all the matrices in advance to fi... 15 Jun 2010 06:30

Vector help, new to matlab!
I'm trying to differentiate sin(x) based on the iteration loop. But evertime i try to i get this error 'DOUBLE cannot convert the input expression into a double array' y=[]; syms x; f=sin(x); for i=1:7 % Taylor series of sin(x) y(i,:)=(-1)^i*(diff(f,i))/(2*i+1); end ... 14 Jun 2010 10:38

How to read serial port with real time windows target
Hello I have read somewhere in the forum that it is possible to read RS232 port real time with rtwt. In documentation it is mentioned that one can write custom blocks for this task but there is no example or explanation. Is there anyone accomplished this. ( I think Mr. Jan Houska wrote that it is possible in the ne... 15 Jun 2010 05:25

Computing 3D error ellipsoids
I know how to calculate a two-dimensional error ellipse from the covariance matrix of a 2D point - but little can be found on computing error ellipsoids in 3D space. Does anybody know how to calculate a three-dimensional error ellipsoid from a 3x3 covariance matrix? This is not really a MATLAB problem, but of course... 14 Jun 2010 08:24