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David Goodmanson


David Goodmanson

Last seen: Today Active since 2012

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Answered
I'm trying to get code to show the increase of density from the center outward.
Hi Matthew, you could try a cutaway view (which doesn't represent the sphere as a solid) n = 40; r0 = 5; [x y z] = sphere(n...

3 dagar ago | 0

Answered
Plotting the profile of an airfoil generated by random NACA numbers.
Hello Keaton, I changed the line TT0 = string(:,3:4) to TT0 = string(:,3) since the program does not run otherwise. ...

3 dagar ago | 0

Answered
Antipodal and Unipolar Analytical Curve
Hello James, For the analytical part, you get an exact match for the curves by replacing Pb_antipodal_analytical = erfc(sqrt(2...

3 dagar ago | 0

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Answered
Total Least squares error help. I tried a couple different things here, but i'm not exactly sure how to do a total least squares error. The numbers aren't making sense to me.
Hi Rian, the problem is that b is a column vector, but predictionvalues is a row vector. Using predictionvalues = m([0, 1, 2,...

12 dagar ago | 1

Answered
pearsrnd and pearspdf are not coherent for the Pearson IV distribution?
Hello Marco, It appears that you are implicating the pearson rand function here, but I believe the real culprit is the pearson ...

14 dagar ago | 1

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Answered
Problem with damping constant affecting displacement in a mass system displacement system
Hi Daneil, I don't see any signs that your calculation is incorrect, although in some cases you may have to run the calculation...

19 dagar ago | 0

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Answered
Interpolation schemes that produce positive second derivatives of the interpolant
Hi SW, Here is one way to go about it. The data has 10 closely spaced points and one well separated point x(11). Fit the firs...

ungefär en månad ago | 0

Answered
3D Fourier Series fftn?
Hi sbr Absolutely this is a 3d fourier series. The reason that the normalization 1/8*LxLyLz does not depend on grid size is th...

ungefär en månad ago | 0

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Answered
Finding nice color bar limits automatically
Hi William, It looks like you want to move from the limits you have to some with fewer significant figures such as 1 or 2. Her...

ungefär en månad ago | 0

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Answered
What are the point locations for EHfields() function output?
Hi XC, I don't have the antenna toolbox but there are definite indications that they are using the sphere command. Sphere has ...

ungefär en månad ago | 0

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Answered
Antenna Element Calibration File Size Calculation
Hi John, assuming the required memory is the product of those four factors, then if these are 64 bit floating point real number...

ungefär en månad ago | 0

Answered
Reciprocity mismatch using geodetic2aer and aer2geodetic
Hi Leonardo, There is no reason for the reciprocity you mentioned to hold true. This has to be the case since the aer coodinat...

ungefär en månad ago | 0

Answered
Can I assign vectors with different number of rows per-column to a matrix?
Hi Abdallah, Cell arrays are very versatile but they are also on the slow side. Depending on what you are doing, that may not ...

ungefär 2 månader ago | 0

Answered
How do I solve this ODE system where there exists derivatives in both sides?
Hi Arda, These two equations are of the form p' Jxx - r' Jxz = f(...) where ... = p,q,r,J,J,M,M (a bunch of known stu...

ungefär 2 månader ago | 0

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Answered
How can I create randomly scattered points between two circles?
(At Adam's suggestion I moved my previous comment to this answer) What tells the tale is the differential area element in the (...

ungefär 2 månader ago | 3

Answered
Hi, everyone! I have a question about generating random meshgrid.
Hello yc, If you are willing to make an approximation to the area of each grid quadrilateral then I think there is a reasonably...

2 månader ago | 0

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Answered
Voltage peaks after opening of a contactor in an inductive circuit
Hello Ivan, I'm not sure how you obtain 17.5kV from 500A and 50ns, and 50ns seems really fast if the contactor is mechanical, b...

2 månader ago | 0

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Answered
How to perform a coordinate transformation in a function?
Hi Kovacs Here is one way. Clearly x^2 + t^2 = xi^2 by inspection, so that factor, which is common to both terms, can be sav...

2 månader ago | 1

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Answered
How can I write "StruveL function" in matlab?
Hello Shreen, Here are two ways although you will need the symbolics toolbox for the first one. I used benign values for z and...

3 månader ago | 0

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Answered
This code runs except the graph and results are incredibly wrong
Hi Connor, The reason your code is going to 10^26 is that you are missing an important factor on the last line of rk4, which is...

3 månader ago | 0

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Answered
How to find the max Phase lead provided by a Compensator?
Hi Gidel, It's not a single command and it's numeric, but is w = 0:.001:10; maxangle = (180/pi)*max(angle((i*w+1)./(i*w+3))) ...

3 månader ago | 1

Answered
impedance matching single stub
Hi Moza, You have most of it, but you need to add a step and change a sign error. The section terminated by R and C, I called ...

3 månader ago | 0

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Answered
11 kV phase to phase voltage, what is the value of phase to ground voltage?
Hi N^2 I believe the result should be Vgnd = 11000/sqrt(3) = 6351 V. However, if the 11000V is RMS, and the voltage to ground ...

3 månader ago | 0

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5 equations, 5 unknowns using fsolve; with scientific variables
Hi Kaushal, looks like 6 eqns 6 unknowns not 5. All of your unknowns appear in the numerators of the given expressions and no...

3 månader ago | 0

Answered
Finding Coefficients for the particular solution
Hi Tashanda, let u and v be 2x1 vectors with the coefficient of cos as first element, coefficient of sine as second element, an...

4 månader ago | 0

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Answered
Power Spectrum estimate using pwelch function
Hi Matthew, I don't think there is an issue here, exactly. pxx_hamming1 is the default psd for pwelch. If you take pxx_hammin...

5 månader ago | 1

Answered
Does MATLAB considers poles while COMPLEX integrating a function?
Hi simran, Yes, the 2F1 expression does consider the pole, as you can see by the fact that the expression gets large as z appoa...

5 månader ago | 1

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Answered
making a 4 x 3 matrix with elements from a 3x7 matrix
Hi Brandon, m1 = rand(3,7) m2 = m1(:,[1 3 4 5]).' m1 = 0.0357 0.6787 0.3922 0.7060 0.0462 0.6948 0...

5 månader ago | 0

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Answered
why FFT result and IFFT result has diffrent in very small value? how to avoid this to increase precission?
Hi nirwana, This is totally normal behavior, just computation being computation. Matlab uses double precision arithmetic with ...

6 månader ago | 0

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Answered
Finding positive-, negative- and zero-sequence components in Matlab
Hi Ygor, I believe the problem is that you are going too soon to real values for Ua,Ub,Uc. In Ua = ((exp(1i.*w1.*t)+exp(-1i.*...

6 månader ago | 1

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