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David Goodmanson


Last seen: Today |  自 2012 起处于活动状态

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已回答
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...

13 days 前 | 0

已回答
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 ...

18 days 前 | 0

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已回答
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...

25 days 前 | 1

已回答
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...

27 days 前 | 0

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已回答
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...

2 months 前 | 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...

2 months 前 | 1

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已回答
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 ...

2 months 前 | 1

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已回答
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...

3 months 前 | 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...

3 months 前 | 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)) ...

3 months 前 | 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...

3 months 前 | 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...

3 months 前 | 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...

3 months 前 | 1

已回答
double and triple integral for a complex function. I coded but did not get any output
Hi Orpita, Here is a way to at least reduce the dimension of the integral from 5d to 3d. First of all, the quantity (x+1/2) se...

4 months 前 | 0

已回答
Logarithmic trendline equation of data
Hello Cem, As has been mentioned you can use the curve fitting toolbox for this job, but if you don't have it you can try a sim...

4 months 前 | 0

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已回答
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...

4 months 前 | 0

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已回答
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 ...

4 months 前 | 0

已回答
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...

5 months 前 | 1

已回答
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...

5 months 前 | 0

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已回答
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...

5 months 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...

5 months 前 | 1

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已回答
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 ...

5 months 前 | 0

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已回答
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...

5 months 前 | 0

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已回答
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 ...

5 months 前 | 1

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已回答
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...

6 months 前 | 0

已回答
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...

6 months 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...

6 months 前 | 1

已回答
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...

7 months 前 | 1

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已回答
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...

7 months 前 | 0

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已回答
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 ...

7 months 前 | 0

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