David Goodmanson

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Answered
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...

5 dagen ago | 1

Answered
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...

24 dagen ago | 0

Answered
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...

ongeveer een maand ago | 1

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Answered
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...

ongeveer een maand ago | 2

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Answered
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...

ongeveer een maand ago | 1

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Answered
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...

ongeveer een maand ago | 0

Answered
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...

ongeveer 2 maanden ago | 1

Answered
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...

ongeveer 2 maanden ago | 0

Answered
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...

ongeveer 2 maanden ago | 0

Answered
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...

ongeveer 2 maanden ago | 0

Answered
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...

ongeveer 2 maanden ago | 0

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Answered
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...

2 maanden ago | 1

Answered
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...

3 maanden ago | 0

Answered
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...

3 maanden ago | 1

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Answered
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...

3 maanden ago | 0

Answered
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...

3 maanden ago | 1

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Answered
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...

3 maanden ago | 0

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Answered
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...

3 maanden ago | 0

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Answered
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...

4 maanden ago | 0

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Answered
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...

4 maanden ago | 1

Answered
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...

4 maanden ago | 0

Answered
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(...

4 maanden ago | 0

Answered
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...

5 maanden ago | 0

Answered
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 ...

5 maanden ago | 0

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When I use ode45 to solve a state space equation, the solution will be diverge. Interestingly, if I set the ma (which I've overstriked) to zero, the result will be converge.
Hi Z^2, It's not easy to say for sure without seeing the actual model, but I think there is a decent chance that your C matrix ...

5 maanden ago | 0

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Answered
Finding the Analytical Equation q(t) for an RLC Circuit Using Given V(t) Data
Hi Trais, The exact solution for q(t) involves integrating the voltage for times less than t. Let w = sqrt(-R^2/4L^2 + 1/LC) ...

5 maanden ago | 0

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Answered
Inverse fft doesn't match analytical formulation
Hi SW, There is a sign error in your transform pair, which should be 1/w^2 <--> -|x|/2 not 1/w^2 <--> |x|/2 As has been n...

5 maanden ago | 1

Answered
why the voltage across a resistor with two different input DC source is the avg of the two different input DC voltage
Hi RAM, The 1 ohm resistor is quite a bit larger than the two .01 ohm resistors so in a first approximation the 1 ohm resistor ...

6 maanden ago | 0

Answered
INTEGARTION OF BESSELH function
Hi george, I don't know what the values of your parameters are, but it appears that the problem with Escat is that besselh(0,2...

6 maanden ago | 0

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Answered
No feasible solution found
Hi Preston, It seems likely that this is a planar structure with the diagonal elements having length sqrt(2). (If all th...

6 maanden ago | 0