David Goodmanson

Last seen: Today | Con actividad desde 2012

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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...

6 días hace | 1

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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...

8 días hace | 2

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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...

15 días hace | 1

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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...

18 días hace | 0

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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...

22 días hace | 1

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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...

23 días hace | 0

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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...

23 días hace | 0

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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...

29 días hace | 0

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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...

alrededor de 1 mes hace | 0

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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...

alrededor de 2 meses hace | 1

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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...

alrededor de 2 meses hace | 0

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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...

alrededor de 2 meses hace | 1

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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...

2 meses hace | 0

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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...

2 meses hace | 1

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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...

2 meses hace | 0

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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...

2 meses hace | 0

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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...

3 meses hace | 0

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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...

3 meses hace | 1

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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...

3 meses hace | 0

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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 meses hace | 0

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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...

4 meses hace | 0

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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 ...

4 meses hace | 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 ...

4 meses hace | 0

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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) ...

4 meses hace | 0

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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 meses hace | 1

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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 ...

5 meses hace | 0

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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...

5 meses hace | 0

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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 meses hace | 0

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2D Fourier transform- problems with the shift
Hi nathan, It is a bit more inconvenent but you can reconstruct using a shifted grid as you did. I kept that method in in the ...

6 meses hace | 0

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How to find indices of resampled values from the indices of the original values?
Hello Mibang, Rather than snew = resample(s,fsnew,fs) I think it's safer to use [snew tnew] = resample(s,t,fsnew) because t...

6 meses hace | 1

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