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David Goodmanson


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Respondida
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...

4 días 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...

8 días hace | 1

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Respondida
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...

12 días 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...

14 días hace | 0

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Respondida
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...

21 días 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...

26 días 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...

alrededor de 1 mes 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...

alrededor de 1 mes 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...

alrededor de 2 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(...

alrededor de 2 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...

2 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 ...

3 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 ...

3 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) ...

3 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...

3 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 ...

3 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...

3 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...

4 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 ...

4 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...

4 meses hace | 1

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fft and ifft of signal seem to cause time reversal
Hi sgreess, I'm guessing your input signal is a column vector. In that case the command spectra = spectra' by Matlab conven...

4 meses hace | 0

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How to fit this model with a Weibull distribution?
Hi MIchele, One possibility is that you are not fitting the correct statistical function to the data. The algebraic expression...

5 meses hace | 0

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Problem with integration: there is a pole on a contour
Hi SB You can use the principal value for the integration,which is defined as (1/2) * [ (integral with path on one side of the...

6 meses hace | 1

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Generalised solution to a n-order system of equations
HI Aden, Here is a method that produces, within 4.5 %, the experimental value a_1 = 2.518. The equation is (for simplicty n-1 ...

6 meses hace | 1

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Solve more complex problems in matlab
HI OF, y(x) = (m-2)x^2 -3mx + (m+2) The domain of m where the two roots have opposite sign is a numerical question and I think...

6 meses hace | 0

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How can I scale and plot the graph according to the formula I use?
Hi Zaref, One thing for sure about eq.(19) in the attachment is that eps0 can't be in the numerator. eps_m is dimensionless (a...

6 meses hace | 0

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Plotting Complex Functions.
Hello Sudharsana, Do you mean f(t) = exp(-ar/(twC))*exp(-ai/(twC)) or f(t) = exp(-ar/(twC))*exp(-i*ai/(twC)) ...

6 meses hace | 0

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How to apply orientation constraints between two rigid bodies
Hi Aiden, because of the parallelism there are only two degrees of freedom here (assuming that one pivot point is the hole nea...

7 meses hace | 1

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How to generate white noise signal from a given PSD?
One can just create the desired waveform that has psd = S0 without resorting to S/N. The example below has a crazy large unphys...

7 meses hace | 0

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How can I replace the upper off diagonal(super diagonal) and lower off diagonal(sub diagonal) of a matrix?
Hello Olawale m = rand(5,5) m1 = diag(m,1) % original upper diagonal a = [2 3 4 5]' % new upper diagonal elements mn...

7 meses hace | 1

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