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**Content Feed**

how to find the angle subtended from origin to the poles in complex plane?

Hello Muhammed, it's as easy as angle(65+65j) angle(65-65j) with each angle in radians subtended from the x axis, -pi < angl...

1 dag ago | 0

| accepted

Matlab and Fortran Precision Issue

Hello SA It's the constants. First of all for simplicity I commented out everythng not concerned with calculation of ORIGINAL_...

3 dagen ago | 0

| accepted

How do you inverse fourier transform 2D data only in one direction?

Hi Gabrielle, I'm not exactly sure what is meant by 'in the x direction' but it sounds like dimension 2. Anyway, ifft(Y,[],2)...

7 dagen ago | 0

| accepted

Principal Component Analysis: difference between V matrix from SVD decomposition and coef from pca?

Hello Jessica, The set of column vectors that define V in svd, or define coeff in pca, can differ from each other by a factor o...

9 dagen ago | 0

extract roll pitch yaw rotation angles from 3D transform

Hello "AT" fwiw, here is a version of finding three rotation angles th1,th2,th3 from a 3d rotation matrix defined below. Ang...

9 dagen ago | 0

my question is what is wrong with my code, the results should be in the first picture not the second.

Hi jana, the problem is that the if statements if mod(row,2)==0 && mod(col,2) ==1 && col>=3 % (b) and i...

18 dagen ago | 0

| accepted

My solver is giving extremely large numbers for a straight forward system of linear equations, what's wrong?

Hi John, What the solver is trying to tell you is that a solution does not exist for this problem, or more correctly it exists ...

18 dagen ago | 1

Finding Argument of Bessel Function (1st Kind) to Return Known Solution

Hello 1:5, syms r ex = 5; R = 160; F = besselj(0,(2.405*r)/(R + ex)); Ratio = 0.3005; q = F == Ratio; vpasolve(q,r,[0 ...

22 dagen ago | 0

| accepted

Multiplication of sparse matrix and a normal matrix

Hi Amit, sum(S)' where the result is still sparse, or full(sum(S)') if you want a regular vector at that point.

23 dagen ago | 0

How to find the best fit curve as a vertical scaling of another curve?

Hi SojM, Suppose you have points x,y for the function f(x), where x and y are column vectors. And suppose the red points are t...

28 dagen ago | 0

| accepted

Solving a system of 4 equations to find the cosine directions from stress matrix and principle stress

Hi Trevor, After taking the terms involving sigma over to the right hand side, the equations are just the eigenvalue equation w...

29 dagen ago | 0

| accepted

How can i use the ifft() function properly?

Hi Andres, Shifting a function in time by t0 produces a factor of exp(2 pi i f t0) in the frequency domain. In this case it's ...

ongeveer een maand ago | 1

| accepted

inverse Fourier transform without error problem

Hi MO, It turns out that the variable m is positive in most of its range, but is negative for the array elements >> [min(find(...

ongeveer een maand ago | 1

| accepted

why the number of point of sfft and istft is different、

Hi neal, The documentation for stft says that if you want the number of sample points to be unaffected, then if length of the ...

ongeveer een maand ago | 1

| accepted

How to solve hyperbolic equation with ratio?

Hi L^2, It never hurts to make a plot. Assume for the moment that z >1. Calling the right hand side of the equation f(x), the...

ongeveer 2 maanden ago | 0

Request for help computing convolution of random variables via fft

Hi Jeff, It's nice to see a contribution of mine from almost four years ago come up, as just one of many people who have made c...

ongeveer 2 maanden ago | 1

| accepted

How to do multiple functions or subroutines in one .m file

Hi Collin Here is a quick example. Functions must go at the very end of the script, and each function must have an 'end' state...

ongeveer 2 maanden ago | 1

spline interpolation of angular data

Hi mukesh, The regular cubic spline is using angle as the independent variable to define x and y parametrically in the usual wa...

ongeveer 2 maanden ago | 0

Change the hot colormap so that the default value of 1 is white

Hi Matthew, The 'hot' colormap has white at one end of its scale and almost-black at the other. Suppose you successfully chang...

ongeveer 2 maanden ago | 0

finding Annihilator matrix on the left for a matrix

HI Waqar, The matlab function null(A) creates a matrix such that A*null(A) = 0. But you want the matrix F to multiply A on the...

2 maanden ago | 1

CDF of VOn Mises distribution

HI Aep, This is straight numerical integration and provides the cdf at 1e6 equally spaced points in theta, from -pi to pi. k...

2 maanden ago | 0

How can I calculate in MATLAB-the electric field due to a time varying magentic field for a simple geometry?

Hello MC, From the plot it is not that easy to see what is going on since the two field colors are similar. Could you post a s...

2 maanden ago | 0

How to make a colorbar with single color with varying intensity?

Hi Subhodh, I agree with Bjorn that it's possible to get caught up in this, and it is going to take some work to make something...

2 maanden ago | 0

Computation of the bandwidth of a spectrum in wavelength domain

Hi Ikechi, the problem is basically that there are not enouch points to work with. lambda = lambdaaxis; lambda_range = (lambd...

3 maanden ago | 0

| accepted

How to calculate permutation powers

Hi lilly, Since the 1:n in the first row is just along for the ride, you don't have to carry it along in the calculation; you c...

3 maanden ago | 0

Does pwelch function adopt already the correction factor due to the window?

hello sy, At this point I believe that the documentation is misleading in that it appears to imply Power/unit_frequency but the...

3 maanden ago | 1

| accepted

How do I define this integral function?

Hello LT, fun1 = @(x) x.^2 q1 = @(x) integral(fun1,0,4) q2 = integral(fun1,0,4) q1 = function_handle with value: ...

3 maanden ago | 0

| accepted

I am trying to solve for w using determinants

Hi Khaled, complex results do not seem right in this situation. M-M' ans = 0 0 0 0 % symmetric ...

3 maanden ago | 0

Help on trigonometric equation solution. Thanks a lot!

Hi Jack, Fortunately the solver is coming up with the correct angle, except for the 2*pi ambiguity. So, after the solver does ...

3 maanden ago | 0

| accepted

Calculation the integral of the exponential of a matrix

Hi raha, I think you can go with the following technique, which does integration, differentiation etc. at the eigenvalue level....

3 maanden ago | 0

| accepted