David Goodmanson
David Goodmanson
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Contribute at least one answer each month for 36 consecutive months
Awarded to David Goodmanson on 02 Nov 2022
Accept 2 answers given by other contributors
Awarded to David Goodmanson on 15 Feb 2022
Answer 10 questions that were unanswered for more than 30 days
Awarded to David Goodmanson on 28 Jun 2021
Reach 1500 reputation points
Awarded to David Goodmanson on 21 May 2019
100 of your answers have been accepted
Awarded to David Goodmanson on 21 Jul 2017
Provide your first answer ever to someone else's question
Awarded to David Goodmanson on 20 Jul 2017
Solve a problem for the first time
Awarded to David Goodmanson on 19 Dec 2012
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回答済み
How change two columns with 5 rows to a single row?
Hi Bajdar, xy = [x; y]; z = xy(:)' i.e. concatenate x and y vertically, read that matrix out columnwise, then take the transp...
How change two columns with 5 rows to a single row?
Hi Bajdar, xy = [x; y]; z = xy(:)' i.e. concatenate x and y vertically, read that matrix out columnwise, then take the transp...
約16時間 前 | 0
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Hi, I am applying findpeaks function to find the peaks of an oscilloscope signal but in the peak plot graph it is automatically changing the x-label with a large difference.
Hi Rikita, if you use findpeaks(y,x) where x is the x axis (linear or log scale) whose min and max match the oscilloscope trace ...
Hi, I am applying findpeaks function to find the peaks of an oscilloscope signal but in the peak plot graph it is automatically changing the x-label with a large difference.
Hi Rikita, if you use findpeaks(y,x) where x is the x axis (linear or log scale) whose min and max match the oscilloscope trace ...
17日 前 | 0
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Why such a fuss with ndgrid and meshgrid issues?
Hi Kristoffer, I totally agree that Mathworks should use nonsquare examples in the documentation for meshgrid, ndgrid, surf etc...
Why such a fuss with ndgrid and meshgrid issues?
Hi Kristoffer, I totally agree that Mathworks should use nonsquare examples in the documentation for meshgrid, ndgrid, surf etc...
22日 前 | 1
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How do I find the phase for a periodic cos wave using fft?
Hi Noam, here is a version using time and frequency in the usual manner. A couple of ponts here. If you construct a grid as y...
How do I find the phase for a periodic cos wave using fft?
Hi Noam, here is a version using time and frequency in the usual manner. A couple of ponts here. If you construct a grid as y...
28日 前 | 0
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how to write the right code to measure the elapsed time of this method d1 = diag(1./diag(A))
Hi Amna, A common way to do this is with tic and toc. So: a = rand(1e4,1e4); tic b = diag(1./diag(a)); toc Elapsed time...
how to write the right code to measure the elapsed time of this method d1 = diag(1./diag(A))
Hi Amna, A common way to do this is with tic and toc. So: a = rand(1e4,1e4); tic b = diag(1./diag(a)); toc Elapsed time...
約1ヶ月 前 | 0
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using polyval with one of the polynomials of a spline obtained with the unmkpp command, the results do not overlap! Why?
Hello TH,. spline polynomials are local to the secgment in question starting from x = 0, so if an interval is, for example 3 to...
using polyval with one of the polynomials of a spline obtained with the unmkpp command, the results do not overlap! Why?
Hello TH,. spline polynomials are local to the secgment in question starting from x = 0, so if an interval is, for example 3 to...
約1ヶ月 前 | 1
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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 ...
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 ...
約1ヶ月 前 | 0
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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...
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...
約2ヶ月 前 | 0
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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 ...
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 ...
約2ヶ月 前 | 1
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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...
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...
約2ヶ月 前 | 0
回答済み
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...
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...
2ヶ月 前 | 1
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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...
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...
2ヶ月 前 | 1
回答済み
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...
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...
3ヶ月 前 | 1
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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...
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...
3ヶ月 前 | 0
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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 ...
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 ...
3ヶ月 前 | 0
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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...
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...
3ヶ月 前 | 1
回答済み
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...
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...
3ヶ月 前 | 0
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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*...
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*...
3ヶ月 前 | 0
回答済み
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-...
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-...
3ヶ月 前 | 0
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回答済み
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...
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...
3ヶ月 前 | 1
回答済み
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; ...
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; ...
3ヶ月 前 | 0
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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 ...
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 ...
3ヶ月 前 | 0
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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...
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...
4ヶ月 前 | 0
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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...
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...
4ヶ月 前 | 0
回答済み
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 ...
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 ...
4ヶ月 前 | 0
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回答済み
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...
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...
4ヶ月 前 | 0
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回答済み
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, ...
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, ...
4ヶ月 前 | 1
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回答済み
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...
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...
4ヶ月 前 | 1
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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...
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...
4ヶ月 前 | 0
回答済み
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...
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...
4ヶ月 前 | 0
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