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David Goodmanson


David Goodmanson

545 2012 年以降の合計貢献数

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Getting a smooth curve instead of two linear functions
Hi Arber, This can be done reasonably well by a hyperola whose asymptotes are the two lines in question. The hyperbola of cour...

約7時間 前 | 1

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eigs bug for 0 as lowest eigenvalue in parts of the matlab versions
Hi pl, 2018b does not list 'sa' as an option for eigs, so I am speculating that that 'sa' is legacy. However, compariing 'sa' t...

3日 前 | 0

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Reduce the computional time to calculate the mutilplying two matrixes
Hi Thu, try % N = 1000; % M = 200; Q00 = reshape(Q0,N,N*M); ff = reshape(w'*Q00,N,M)'; This is approximately four times f...

3日 前 | 1

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sine fit in matlab vs closed-form expressions (linear least squares)
Hi Thales, Before doing the least squares calculation it makes sense to try the less ambitious result of finding the right ampl...

4日 前 | 2

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Replace vector of idexes with values from another vector corresponding to those indexes
Hi Nate, c = b(a) gets it done. a becomes an index vector into the elements of b.

4日 前 | 1

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Division problems wiht matrix, calculation error
Hi Eduardo, It's quite likely that two of the displayed values for LineInf and LineSup are not what you think they are. The va...

4日 前 | 0

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Audio fft shape is too strange.
Hi eunbae, The code is pretty close. The fft of a real signal has positive and negative frequencies, and what you are seeing a...

5日 前 | 1

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Is It possible create a function that, given an equation, finds the value of the (x) so the two members are equal?
Hi Gianmarco, the two equations aren't coupled, and using fzero on Mp^2 seems to work. In the first equation I multiplied by b...

13日 前 | 0

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Defining derivatives in ode45
Hello sina, If you turn the diagram around by 180 degrees and then let Ca <--> Cb, you get exactly the same diagram that you st...

15日 前 | 1

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3d Hemisphere transformation Problem from A to 90 degrees in Z axis to B direction
Hi Musa, In the figure you don't say which axis is which, but I will assume +x axis out of the page toward the viewer, +y axis ...

15日 前 | 1

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Binomial simulation decreasing error
Hello LD Using M in place of your i, the binornd(M,p*ones(1,N)) creates N draws from a particular binomial distribution. Thi...

24日 前 | 1

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power of blackbody radiation
HI rabindra, The expression has a problem at the first point, lambda = 0. But I1 is so tiny near the origin that you can safel...

28日 前 | 0

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Phase shift - different results with pi/2 and 1.570796326
Hi Buli, Although I don't have simulink, I think it is reasonably clear what is going on. I will assume here that -pi/2 is the...

約1ヶ月 前 | 2

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to find the root of quantum transcendental equation
Hi pl, The boundary condition K*cot((KR) = -k (denoted by bc1 below) is for a wave function that is proportional to sin(KR) in ...

約1ヶ月 前 | 0

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Solving inequalities without Symbolic Math Toolbox
Hi Andrik, I'm not sure why you are calling these equations 'inequalities', but if you are looking for a numerical solution to ...

約1ヶ月 前 | 0

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Circularly exclude elements.
Hi Abhijit, try x = 1:n; x(mod([k-1 k+1]-1,n)+1) = []

約1ヶ月 前 | 1

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1st element of the 'Amplitude' of a fft function
Hi NIma, As you point out, signal_FFT(1) is the sum of all the X values (or the mean if you divide by the number of points in X...

約2ヶ月 前 | 1

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Select which legend entries to use depending on data set plotted
Hi Henry, A simple way to do this is, when a trace does not exist, substitute it with nan(1,n) or nan(n,1), keeping the array t...

約2ヶ月 前 | 0

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How to plot a numerical integral using the trapezoidal method
Hi Mahdi, I believe your units are correct, although dividing by D gives normalized conductivity and not absolute conductivity....

約2ヶ月 前 | 0

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FFT and IFFT: Random Phases
Hi Nycholas, Assuming signal is real and of length n, n even, then Y(1) is for frequency 0, the DC contribution, and it's real...

2ヶ月 前 | 0

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Difference between x*(1e-n1) == x/(1en2)??
Hi Rob, The difference comes down to rounding of the very last digit in binary representation. It's interesting to use 'format...

2ヶ月 前 | 1

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In the "ex_simrf_adc", there is a 50 Ohm connection with the voltage of 0.1 micro Volt input and it is converted to -142 dBm input and I am not able to get the exact power calculation. Could you please show me?
Hi Charles, I don't have simulink, but to convert from Vrms to dBm, dBm = 10*log10(Vrms.^2/50) + 30; Here Vrms.^2/50 is the p...

2ヶ月 前 | 0

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problem of pdepe!
Hi Junyi, When you made the change, the flux went down by a factor of 1/pi^2. That's fine, but one of your boundary conditions...

2ヶ月 前 | 0

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how do i plot sin(2pi*3t) * sin(2pi*15t)
Hi Jesus, what they are saying is % .* for element-by-element multiplication y=sin(2*pi*3*t).*sin(2*pi*15*t);

2ヶ月 前 | 0

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My matlab plot is blank when I plot
Hi Henry, In the definition of H1, use ./ instead of / so you get term-by-term division. To spot the error, one straighforwa...

2ヶ月 前 | 1

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Determine the maxima and minima of the function
Hi Maria, for a fumction f(x), fminbnd determines the value of x where the minimum occurs. You would have found p09xmax if you...

2ヶ月 前 | 0

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Using find between two points
Hi Darpan, try it with just one & sign. && is for scalar comparisons, and you have a vector on each side.

2ヶ月 前 | 1

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Help to approximate this integral...
Hi M^2, I am assuming that y(t) is strictly monotonic increasing or decreasing so that the inverse exists. It's good if the y ...

3ヶ月 前 | 0

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Why pca on my matrix gives the first number in latent matrix greater than one?
Hi Penny, Is there a reason that you think that a matrix of all ones and zeros can't have a latent value greater than 1? Here ...

3ヶ月 前 | 1

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Finding miminum and maximum of function f(x)
Hi Faris, In 1d I assume you had y = f(x) with an x vector of length n, so its index is 1:n. Then [ymax ind] = max(y) xmax =...

3ヶ月 前 | 1

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