Answered
Differentiate with Respect to Derivative
Hello Mitra, what version of Matlab are you running? Running your code in 2021b gives D1 = m*diff(x(t), t) as desir...

6 months ago | 1

Answered
Huge difference between the result of fft function Matlab and analytical Fourier transform of the same function
Hi ST, Your frequency grid runs from -5 to 5, which for an fft is -fs/2 to fs/2 (fs being the sampling frequency), so fs = ...

6 months ago | 0

Answered
Plotting the theoretical maximum possible efficiency of a heat engine
Hi Aidan, It's possible to fix up the for loop, but easier and much more in the spirit of Matlab to do this with vectors. Tl1=...

7 months ago | 0

Answered
Compute wave energy converter power output using power matrix
Hi Ross, For the matrices SWH and T02, which I will call S and T, do they already meet the condition S contains integers from ...

7 months ago | 0

Answered
Finding PSD from Autocorrelation, FFT, Periodogram and Pwelch
Hello YK, Since you are using ffts, the appropriate correlation is going to be circular correlation. This can be done by using...

7 months ago | 1

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Answered
is there any method to apply the for loop in this, I caN't see any pattern please help in this
Hi Sahil, This can be done by for loop but it is maybe better to do the whole thing with index manipulation. In the written-ou...

7 months ago | 0

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Answered
How can I show Electric Potential due to a Dipole as a 3D surface?
Hi Luca, Since you can't show the values of the potential at every point in the 3d space, this is most commonly done by showing...

7 months ago | 0

Answered
What is the equation used for taylor window function 'taylorwin'
Hi Palguna, The equations are in the attachment. rect(t) is a rectagle function, = 1 for -1/2<= t <= 1/2, 0 otherwise. That's...

7 months ago | 2

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Answered
Explanation for a function within xcorr
Hi big, rather than puzzle this out in place, it seemed easier to look at the output of the function for the first hundred valu...

7 months ago | 0

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Answered
Got wrong normal vector
Hi AC, You were quite right in your suspicions of the 3d plot, which looks fishy. You might call this a configuration control ...

7 months ago | 0

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Answered
fft vs nufft- scaling
Hi Nathan, In the fft case you are dividing by N = 1500 and multiplying by 2. For nufft you aren't doing that. Hence the fact...

8 months ago | 0

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Answered
Why I got the dominant frequency as 1/time when I running fft?
Hi CS, here is an example, first with 800 points, then 400 points. The frequency scale is constructed differently in each one ...

8 months ago | 0

Answered
finding the orthogonal vectors for a series of vectors
Hi Pouya, Here is another method, somewhat related to Bruno's a = 2*rand(1000,3)-1; m1 = tril(ones(3,3)) -triu(ones(3,3)) ...

8 months ago | 1

Answered
spline for corner object
HI Mehri, try sorting by angle around a point in the center: x0 = 350; y0 = 325; theta = atan2(y-y0,x-x0); [~,ind] = sort(t...

8 months ago | 1

Answered
I want to solve this couple differential where the dot represent the derivative with respect to t/tp, where tp = 30E-9, is my code for solving this is correct? ?
Hi Sahil, Since the constants are all of order 10^-3 to 10^3 or so, it's evident that normalized units are in play. So you hav...

8 months ago | 0

Answered
Write a vectorial function from a scalar function
Hi Giuseppi, it looks like you intend, in this case, f = @(z,y) z.^2 + y^2 Here .^ gives the element-by-element square of z, ...

8 months ago | 0

Answered
What is the use case for ifft's trailing zero padding? Why is that the default?
Hi Kevin. Zeropaddinig has consequences. It also has its uses, but sometimes the results are unexpected. First of all, whatev...

8 months ago | 1

Answered
Why is it giving me undefined function for the slope field?
Hello Brenda, As an alternative to figuring out how to get that code up and running, or as a comparison, you can run your own c...

8 months ago | 0

Answered
How to code this quadratic minimization problem subject to a linear constraint?
Hi Armando/Bianca Suppose lambda is a 1x3 row vector. The code below is based on the fact that the solution abc (which is the ...

9 months ago | 0

Answered
Interpolation of the values of points on the surface created by convex hull
Hi Jose/Nima, Suppose you have a triangle with vertex points p1, p2, p3, each of those defined by a column vector of their x,y,...

9 months ago | 0

Answered
generate white gaussian noise
Hi HL, Since white gaussian noise is just random draws from a normal distribution, you don't really need some toolbox or other,...

9 months ago | 0

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Answered
Signal compensation of Time signal via FFT and cable loss frequency spectrum
Hi Michael, Although the Nyquist frequency is N/(2*delta_t), you have to consider both positive and negative frequencies. Assu...

9 months ago | 0

Answered
calculation code of PSD using fft
Hi DK, Since you are after power spectral density, and not the spectrum of the linear quantity fft(x), this means the square of...

9 months ago | 0

Answered
precision of double variables
Hi Arda, you pretty much answered the question by mentioning precision. Most floating point numbers are not represented exactl...

9 months ago | 1

Answered
My code is giving only one solution to a function although there are two solutions, what can I do to get all the solutions?
Hi JN, syms x; assume(x,'positive') and proceed as before for the second one. It is not a great idea to use 'roots' as the n...

9 months ago | 1

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Answered
plotting T-U diagram using XSteam
Hi Aldan, the code is running through all the values, but it's not saving any of them. You need to do something like m = 220;...

9 months ago | 1

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Answered
I want to highlight the curve of intersection of the sphare and the plane x+y+z=0 by a thick blue curve. How to do that?
Hi Atom, Your code doesn't work because if you multiply out X2^2 + Y2^2 + Z2^2, you don't get R^2. So that arc is not on the s...

9 months ago | 0

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Answered
How can I change this explicit method code to the implicit method code?
Hi MC I am not sure what is meant by 'implicit method', and while numerical methods are good, there is also the exact expressio...

10 months ago | 0

Answered
How to plot the magnitude and the phase of this function f(1/z)=(0.5 + 000i)*z^(−1 )+ (0.2500 − 0.4330i)*z^(−2) + (−0.2500 − 0.4330i)*z^(−3)?
Hello Aisha, technically this equation should read f(z)=(0.5 + 000i)*z.^(−1 )+ (0.2500 − 0.4330i)*z.^(−2) + (−0.2500 − 0.4330i...

10 months ago | 0

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Answered
How to Plot Ramsey Phase Plane
HI ec, There are a couple of issues here. First, the cdot expression lacks a dot, should be k.^(alpha-1). Second, the grid ...

10 months ago | 0

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