回答済み
Fast Fourier Transform Issue
Hi Anas, suppose you have N = 1000 points over an interval of one second. The time array is t = (0:999)/1000. [see note below]...

約5年前 | 0

| 採用済み

回答済み
LOG PEARSON TYPE III distribution
Hi Raj, MODIFIED Since the pearson type iii is a gamma distribution with a shifted and scaled variable, that means you can use...

5年以上前 | 0

回答済み
real data FFT and reconstruction - frequency base issues
Hi Vmat. I believe that with 'rec' you may be confusing the time and frequency domains. The code below uses rec for the time d...

5年以上前 | 0

回答済み
How to Solve sytem of 7 equations with 6 unknown variables? How to combine any two equations? equations and variables given belowRequest for help
Hello Vijaya, This is an overdetermined set of linear equations of the form M*x = b and can be solved in the least squares sens...

5年以上前 | 0

| 採用済み

回答済み
Running out of memory selecting parts of a large sparse matrix
Hi Benjamin, I believe this works as required. This example is 4e5 x 4e5, with 99.99% zeros. On my pc it takes 3 sec to make ...

5年以上前 | 0

回答済み
How can integrate and differentiate spherical Bessel functions in Matlab
Hello MB, [1] Dimensionally, k can't be wavelength. Maybe you meant the wave number, 2pi / lambda. [2] The integrand increas...

5年以上前 | 0

回答済み
Zeros and ones vector
Hi Fieke, My previous effort answered the wrong question (the code for that is under the dashed line below). You want a matrix...

5年以上前 | 0

回答済み
How to produce frequency vector corresponding to FFT() samples?
Hi Samuel, In the code you borrowed, t is just a time array so that you can create a function of time. The t array starts at 0...

5年以上前 | 0

| 採用済み

回答済み
Amplitude of FFT is not correct
Hi Meikel, You are multiplying your signal times a window, which reduces the signal amplitude. That has to have a significant ...

5年以上前 | 0

| 採用済み

回答済み
Inverse fourier transform is not regenerating original signal amplitudes
Hi Sebastian, You appear to be treating fs in somewhat casual fashion. If fs = 1e5, then for a 1 sec pulse duration the number...

5年以上前 | 0

| 採用済み

回答済み
How to vectorize the following code for matrix insertion?
Hi Jordan, Here is one method. Whether or not it is faster than the for loop method is another question. The code does exactl...

5年以上前 | 2

回答済み
How to obtain the exact value of wavelength from a 2D FFT amplitude vs wavenumber plot like it is obtainable from 1D FFT amplitude vs wavenumber plot?
Hello SB, I am speculating that the issue is the offset from the correct frequencies in the fequency domain plot. The culprit ...

5年以上前 | 1

| 採用済み

回答済み
Why is the radiation pattern does not show the required steering angle?
Hi ZW, In the code below, the key line is s = s + exp((-1j*k*d*(i-1).*sin(angle_1rad(th))) +1j*AF(i)); %equation for field w...

5年以上前 | 0

| 採用済み

回答済み
Why do these two codes give different covariance matrices?
Hi Sadiq, cov subtracts mean from each column of S, and also divides by (size(S,1) -1). Also S and S' have to be multiplied in...

5年以上前 | 0

回答済み
Mean of the rand function goes against theory
Hi Tarek, the reason that you don't see 0.5 is that you are taking a finite number of samples, 1024, from the distribution. Du...

5年以上前 | 1

| 採用済み

回答済み
How can I find an orthogonal vector?
Hello Sue, use null of the transpose of p: syms a p=[1;-a;0] n = null(p.') n = [ a, 0] [ 1, 0] [ 0, 1] and each col...

5年以上前 | 2

| 採用済み

回答済み
Generation of a basis vector following a constraint.
Hi Vira, The for loops that you did are a good approach, but like you say this will become impractical as the length of the vec...

5年以上前 | 0

| 採用済み

回答済み
Output of Deconv function Matlab
Hi Aleem, [1 -4] does not divide evenly into [1 -3 -52] so there is a remainder: [a b] = deconv([1 -3 -52],[1 -4]) % b is t...

5年以上前 | 0

回答済み
how to create new cumulative frequency array from two existing arrays
Hi BW, mu = 50 sigma = 10 Y = normrnd(mu, sigma, 1,1000); v = linspace(1,1000, 1000); a = cumsum(Y<=v)

5年以上前 | 0

回答済み
Ode45 with 3 non-linear equations
Hi Ahmed, it might be a good idea to go back to the original derivation for this system. Instead of that, you can rewrite this...

5年以上前 | 0

回答済み
High Resolution fft2 image
The nested for loops use the same variable i, meaning that the outer one doesn't do anything except run through the inner one fi...

5年以上前 | 0

| 採用済み

回答済み
How can i solve the Error using erfc- Input must be real and full
Hello Siti, Although erfc does not take complex arguments as you know, the kummer U function is available and does take complex...

5年以上前 | 1

回答済み
Fitting impedance of simple randles circuit to Fourier transform formula
Hi F^2 I believe you are trying to fit an incorrect magnitude, which can of course lead to nonsense. The correct expression is...

5年以上前 | 0

回答済み
Want to Get Plot To Have Contunuous Angles, Not Stay between -180 and +180 Degrees
Hi Jon, use unwrap(your_data,180) where 180 is just an example and can be anything smaller than the size of the jumps (but no...

5年以上前 | 1

| 採用済み

回答済み
Issue with getting correct FFT phase plot
Hello SB, the issue here is that the signal window is not the correct width to give the periodicity that you would like. Right...

5年以上前 | 0

| 採用済み

回答済み
Permutations of ordered set where only one object changes its position.
Hi Michael, no there is not. CBA is a permutation, and it cannot be made to fit the pattern.

5年以上前 | 0

| 採用済み

回答済み
ode23, ode45 acting weird - why?
Hi William, Very interesting behavior. Different look but still impressive when the span ends at 40.1. I think the reason may...

5年以上前 | 1

| 採用済み

回答済み
Equation for Fourier Series
Hi Romain, increasing the nomber of points is a good idea. I used t=0:0.01*10^(-6):6*10^(-6); but I believe there is also a ...

5年以上前 | 2

| 採用済み

回答済み
Symbolic solution by matching coefficients in trigonometric equation
Hello Gabriel, here is one way syms id iq x1 y1 th1 th2 eq1 = id*cos(th1) - iq*sin(th1) == 2*x1*cos(th1) - 2*y1*sin(th1) eq2...

5年以上前 | 0

回答済み
optimization using lagrange multipliers
Hi Lal, The problem is that you have V(x,y,z) = x*y*z as a function, but you do not define a fixed value for the volume. The ...

5年以上前 | 1

| 採用済み