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**Content Feed**

Would you tell me the code for Fisher Pearson skewness?

Hi Chris, y = rand(1,100); % some data m = mean(y); n = numel(y); scalc = (sum((y-m).^3)/n)/var(y,1)^(3/2) s = skewness...

5 days ago | 0

| accepted

Why doesn't the kurtosis function work properly for complex numbers?

Hi Guillem, Both the standard deviation and the variance (std and var) work correctly for complex argument, so kurtosis appears...

5 days ago | 1

| accepted

SIR model with recovered individuals may lose their immunity and become reinfected with the disease. But came with a failure about integration tolerances

Hi Julian, I have doubts about the equations, because with dq(1) = -S as you have, the equations are equivalent to S = -beta*S...

6 days ago | 0

what does the positive and negative values concave mean?.

Hello Aisha, You are looking at a polynomial function of z, with two roots as you stated. To see what is going on, it helps to...

6 days ago | 0

| accepted

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...

14 days ago | 1

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 = ...

15 days ago | 0

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=...

20 days ago | 0

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 ...

20 days ago | 0

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...

22 days ago | 0

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...

28 days ago | 0

| accepted

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...

30 days ago | 0

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...

1 month ago | 2

| accepted

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...

1 month ago | 0

| accepted

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 ...

1 month ago | 0

| accepted

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...

2 months ago | 0

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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 ...

2 months ago | 0

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)) ...

2 months ago | 1

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...

2 months ago | 1

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...

2 months ago | 0

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, ...

2 months ago | 0

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...

2 months ago | 1

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...

3 months ago | 0

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 ...

3 months ago | 0

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,...

3 months ago | 0

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,...

3 months ago | 0

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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...

3 months ago | 0

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...

3 months ago | 0

precision of double variables

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

3 months ago | 1

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...

3 months ago | 1

| accepted

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;...

3 months ago | 1

| accepted