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David Goodmanson


David Goodmanson

Last seen: Today Aktiv seit 2012

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  • 36 Month Streak
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Beantwortet
Multiplication of submatrices of a matrix
Hi Laura, if I interpret this correctly, you have n rows (I'll use small letters mostly) of the form Anew = [c c*b1 c c*b2 ...

10 Tage vor | 0

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Beantwortet
matrix inverse results different between r2023b and 2021b
Hi QL. you called both the inverse matrices '2021b' so I called the first one F and the second one S (and the orginal matrix is...

12 Tage vor | 0

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Beantwortet
How do I get rid of these weird lines in the surf plot?
Hello Max, It appears that the GetRectGrid function creates points whose order is imcompatible with the reshape functions that ...

15 Tage vor | 1

| akzeptiert

Beantwortet
Error in ode45 solution
Hello PS, Assuming the following (before variables get changed around) tv_jk = tv_kj, for all j,k all real de...

22 Tage vor | 0

Beantwortet
reproduces the audio signal after sampling!!!
Hello Vu & Paul, < I took a brief look at the Vaidyanathan.paper and although the decimation process seems clear enough, the 'i...

30 Tage vor | 1

Beantwortet
Matlab got this wrong: Limit as n goes to infinity: (1+(i/n))^(n^2). Matlab says it's exp(2), which is wrong. Pls confirm.
Hi Moses, not every expression has a limit, or should. That's the case here, as anyone can check. For large n the function zi...

etwa ein Monat vor | 1

Beantwortet
Is there a way to create a lot of graphs for a 4D matrix without coding for a ton of individual graphs?
Hi Kitt, Here is one approach. In the example you are using imagsc plots instead of e.g. 1d plots of some state quantity vs. t...

etwa 2 Monate vor | 1

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Beantwortet
How can I calculate the integral of associate LegendreP(1,n,theta)*cos(theta)^2 ?
Hello Se, First of all I think you probably mean the integral of P(1,n,cos(theta))*cos(theta)^2 which is what makes sense whe...

etwa 2 Monate vor | 0

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Beantwortet
How to solve swallowtail integral
Hello YM, You won't be able to solve this as a closed form function of X,Y,Z but you can find the integral for given values of ...

etwa 2 Monate vor | 0

Beantwortet
Trying to ubderstand the power distribution in fft plot
Hello Yogesh, The fact that all the abs(peaks)^2 add up to the expected total is just Parseval's theorem and has really nothing...

etwa 2 Monate vor | 1

Beantwortet
How to interpret the amplitude of impulse() results
Hi HG, the large ampltude of the impulse response is correct. (has the original question been edited?) This has to be the cas...

etwa 2 Monate vor | 0

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Beantwortet
Find intersections of two sin wave function
Hello ZH The symbol f is a bit overused in your example, but if you have two functions g1 = A*sin(2*pi*f1*t +phi).^2 g2 = A*...

etwa 2 Monate vor | 0

Beantwortet
Struggling to decide the sampling frequency for this fft plot
Hi Yogesh, If the time array has spacing delt (which you denote by dt) and the frequency array has spacing delf, then for an N-...

2 Monate vor | 0

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Beantwortet
Why is my 3D Projectile Trajectory not being calculated properly?
Hi Abeljohn, I think the only real issue here is trying to view the trajectory in plot3, If you let the ground be the xy plane...

2 Monate vor | 1

Beantwortet
When this code is executed, 36 separate windows will open. I want the result to be displayed in a window.
Hi Babr, I think this is basically what is intended, taking the plot out of the for loop. close all; clear; clc N = 2048; ...

2 Monate vor | 0

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Beantwortet
Why do the limits of the following two equations have opposite signs? (MATLAB R2024a Update 1 _20240418)
Hello dq, I think the behaviour is reasonably clear. The first example is limit((1-(-1)^n)/n, n, 0) = -pi*i. If you look at ...

2 Monate vor | 0

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Beantwortet
Issue in getting correct probabilities for Landau Zener Problem
Hello Aryaman, I believe your step sizes are too large, but the first issue is, in the for loop you define a=v*t(i)/2; but then...

3 Monate vor | 0

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Beantwortet
periodic angular acceleration of mechabism
Hi Alberto, (modified once more) If you apply a constant torque tau and advance the angle of the crank by an angle u, then you...

3 Monate vor | 0

Beantwortet
What does the period in line 20 ( after v)represent and why is it needed
Hi Bob, f is a vector with 1000 elements and consequently, so is the denominator. The dot allows matlab to divide each of the ...

3 Monate vor | 0

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Beantwortet
Fixed-step size: why doesn't the Nyquist-Shannon sampling theorem work?
Hello Zahara, The Nyquist theorem gives you the bare minimum number of points to describe the oscillation. More points are bet...

3 Monate vor | 0

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Beantwortet
caculate confidence interval from customized pdf
Hello SX, Ordinarily to find the cdfs you would have to use numerical integration. In this case for the normal distributions, ...

3 Monate vor | 1

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Beantwortet
Helmholtz problem in circular disk
Hi Athanasios, the problem is with the table of zeros of the bessel functions. Counting starts with the first nonzero value, s...

3 Monate vor | 1

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Beantwortet
How can it be that my continuous relative phase exceeds 360 degrees?
Hello Suuz, There is nothing inherently wrong with a phase angle of more than 360 degrees. In fact such a phase can be valuabl...

3 Monate vor | 0

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Symbolic derivative in a sum
Hello OG, If you know d/dp G for the elements of G, you can use d/dp G^-1 = -G^-1 (d/dp G) G^-1 which is all right numericall...

3 Monate vor | 0

Beantwortet
Solving complex linear equations with conjugate operations
Hello SB, Any way you look at it you have four independent unknown quantities, but there is some choice of their form. For the...

4 Monate vor | 0

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Beantwortet
Confusing THD value for a Signal without Harmonics
Hi weinan, MODIFIED The thd process widens the peaks, as shown by the plot produced when you invoke thd. When the frequency i...

4 Monate vor | 1

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Beantwortet
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...

4 Monate vor | 0

Beantwortet
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. ...

4 Monate vor | 0

Beantwortet
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...

4 Monate vor | 0

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Beantwortet
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,...

4 Monate vor | 1

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