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Feeds
Positive Roots of bessel functions.
Hi Javeria, here is a function besse0j to calculate the roots of J and J'. (at the origin, Jn(0) = 0 for n>0 but these zeros ar...
14 días hace | 0
Can we find derivative of bessel functions in matlab directly?
Hi Javeria, Here is a function that produces J'm(x) for integer m. function y = besseljd(n,x,opt) % derivative of bessel fu...
15 días hace | 0
solving system of equations
Hi Javeria, If it's not required to solve this in the way you mention, there is a better way. Assume that x2 is positive or ze...
22 días hace | 0
Why am I only getting the upper sideband when multiplying complex signals?
Hi Jared, You probably can't reproduce the result with a single operation. When you use the 'complex' option, the resulting wa...
alrededor de 1 mes hace | 0
The coefficients of a Hermite polynomial
Hi Magdy, For a change of pace, here is a function that calculates the coefficents of Hn by recursion. I didn't want to get in...
alrededor de 1 mes hace | 0
why mod(rref(A), 2) does not give the correct result?
Hi Lily, Although c is a linear combination of a and b mod 2, rref does not know anything about mod 2. rank([a b c]) ans = ...
alrededor de 2 meses hace | 0
| aceptada
how to determine the wavelengths of an fft of a non-dimensional sequence
Hi Andreas, For a fourier transform, time and frequency, or length and wave number, or [before-fourier-transform] independent v...
2 meses hace | 1
Can I get the integral formula using Matlab?
Hello Haya, The integral is very much defined for m=n. In that case you are integrating the function sin(n*x/2)^2*(x-pi)^2 w...
3 meses hace | 0
Is there any expert who knows how the SNR result in the RF Budget Analyzer is calculated? Why is it inconsistent with the value I calculated?
Hi ZW, It's good to work out things independently as you are doing. The available power is 0 dBm, i.e. 1 milliwatt = -30 dB wa...
3 meses hace | 1
| aceptada
Peak in probability distribution moves in normpdf when changing lower bound for input vector
Hi Chris, try x = 10e3:70e3; plot(x,normpdf(x,40e3,6e3)) The problem occurs because if you create y = f(x) and use plot(y), t...
3 meses hace | 2
| aceptada
Regarding grid generation using finite difference method (*code fixed)
Hello arxiv, It appears that what you want in the code is not new_x = x(n, m) + Delta_eta * ((pi/4) - y_xi)/(x_xi); but rath...
3 meses hace | 1
| aceptada
solve Lagrange eqs.
Hi Lorenzo, The sin(phi) factor in the denominator does not really matter, in the sense that if phi can be zero, then the parti...
3 meses hace | 0
How to remove a mirror tilt
Suppose the two mirrors, the source and the detector are as shown below. Assume the beam splitter does not have a wedge effect...
4 meses hace | 1
Remove ignored complex values from a plot
Hi Arne, Either you are getting complex numbers because of an error in the algebra that you coded up (I assume you have checked...
4 meses hace | 0
bessel funtion drawing problem part two
Hello Zeyuan, You are using the expression Y(nu,z) = (J(nu,z)*cos(nu*pi) - J(-nu,z))/sin(nu(z)) which does not work when nu i...
4 meses hace | 0
trouver un angle avec l'equation de trajectoire d'un projectile
The syms solutions are getting out of hand, which is not all that unusual. The kinematic equations evidently are for a projecti...
4 meses hace | 0
Plotting inverse Laplace transform
Hi SA Speculative answer: I don't believe that the function F is a likely candidate for a Laplace transform. What you have is...
4 meses hace | 0
| aceptada
Looking for linear system Ax=0 precision improvements
Hi vanni, My comment of March 4 discussed relative error calculations in solving for x in A*x = 0. (Some boring details are me...
4 meses hace | 1
Issue with Time-Domain Shifting Using Fourier Shift Property in MATLAB
Hi Jason, I believe the main issue here is that your time waveform has significant frequency content that exceeds the nyquist f...
5 meses hace | 0
Finding the points where Bessel functions are equivalent
Hi Matthew, If you scale this problem properly, the process is much clearer. And in this case, It also allows f...
5 meses hace | 1
| aceptada
Error in the diagonalization of the Hamiltonian of the Zeeman effect
Hi Sebastian, The best way would be to find four subspaces that are not coupled by the Hamiltonian when BF is included. That m...
5 meses hace | 0
What does cart2sph compute az,el,r or theta,phi,r
Hi William, it's az and el. [a b r] = cart2sph(0,1,0) a = 1.5708 b = 0 % elevation r = 1 [a b r] = cart2s...
5 meses hace | 1
| aceptada
Why is my matrix being multiplied by scientific notation?
Hi Valerie, Since the data has widely varying values, there usually has to be an overall scaling of some kind. That is what yo...
5 meses hace | 0
| aceptada
Write different super gaussian function with same fwhm but different order
Hi Hugo, There seems to be some confusion as to whether the constant that is used as the reference constant between various val...
5 meses hace | 0
| aceptada
Error in executing freqz command on LINUX server
Hi Neuling, If all else fails you could just write your own version. Something like function [H w] = freqz1(b,a,n); % parall...
6 meses hace | 0
| aceptada
problem using fplot for small arguments of spherical bessel functions
Hi Donaldo, As you probably know, the function works pretty well except for small values of r around the origin where you see a...
6 meses hace | 1
SVPWM abnormal current under inductive load
Hi Bahdir, I believe the effect is real and can't be 'solved'. When the loads are purely resitive, the current and voltage are...
6 meses hace | 0
Hello everyone, I have a question about numerical integration. The formula is shown below, where the integration path C_beta is a closed curve on the complex plane.
Hi MJ, The result depends on what goes on in the complex plane, so as an intro here are some plots of the angle of functions f(...
7 meses hace | 0
How do I apply a gravitational gradient to this code? (particles in elastic collision)
Hi Alex If you don't need the details of the actual trajectory, the method is pretty simple. Modeling the asteroid as a sphere...
7 meses hace | 0
How do I find the equation of points on a spline curve?
Hi Aiden, you have to remember that for each section of the spline, the polynomial is local to that section, i.e. the argument ...
7 meses hace | 0
