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**Content Feed**

How can I represent the sparse mass, damping and stiffness matrices in state space?

HI 'M', Suppose you have n positions and n corresponding velocities. Let the state space (column) vector be in the order y = ...

etwa 6 Stunden ago | 0

Adding matrices (to assemble global stiffness matrix)

Hi Ryan, here is an example. In the code below, a and b are the indices of the 4x4 submatrix of K that each stiffness submatri...

8 Tage ago | 0

| accepted

Wrong answer being given when adding whole numbers

Hello Matthew, this is happening because the image uses uint8 values (unsigned integer 8 bit), with a range of 0 to 2^8 -1 = 25...

8 Tage ago | 0

| accepted

How to calculate energy of the signal at a specific frequency after applying FFT

Hello Daniel, To get the desired result you have to be careful about the number of points, so that an exact number of oscillati...

12 Tage ago | 0

How to multiply each column in the matrix by different scientific notation values that should be imported from a txt file?

HI Gabrielle, MODIFIED Looks like you have constructing the 128x256 matrix of values covered. The code below converts S{1} to...

12 Tage ago | 0

| accepted

Using numerical methods to plot solution to first-order nonlinear differential equation

Hello Aleem, You are saying that the analytical solution is not relevant because it involves complex numbers, but that's not th...

13 Tage ago | 0

MATLAB determine if matrices are invertible or not

Hi SS P+Q ans = 9 9 2 13 0 0 3 4 -3 -3 6 1 1 1 2 6 det(P+Q) ans = ...

14 Tage ago | 1

Solve matrix series equation

Hi Ramesh, This is an overdetermined system, but if you define x as a 2x7 matrix of 2d coordinate values and X as a correspondi...

16 Tage ago | 0

interpreting frequency vs phase plot in fft

Hello JL, Since sin(2*pi*f*t) = ( e^(2*pi*i*f*t)-e^(-2*pi*i*f*t) )/(2i), (1) the sine signal has both positive and ...

18 Tage ago | 0

Why does the cscvn function of matlab have 4*2*(n-1) coefficients?

Hello Ashkan, factor of (n-1) because n points --> (n-1) intervals, and the polynomials are defined on the intervals factor o...

22 Tage ago | 0

Solving a transcendental equation

Hi Kubilay, Finding an algebraic solution for this equation in terms of lambda is not going to happen. But a numerical solutio...

27 Tage ago | 1

| accepted

How to use Poisson distribution?

Hi Jaya, You appear to be saying that you can't use a loop to increment through event times. For example, though, just before ...

29 Tage ago | 0

| accepted

I want to treat w as a constant

Hello HJ, try replacing the first line with syms y(x) w real in which case the result is ySol(x) = (exp(-x)*(sin(w*x) + w*c...

etwa ein Monat ago | 0

Setting a 3rd vector with specific angles to 2 other vectors

Hi Huseyin, The method you are using gets you into an iterative process of successive rotations about the x and z axis that eve...

etwa ein Monat ago | 0

| accepted

ODE system with 2 degrees of freedom

Hi Nader, you only need four variables, theta1, theta1dot, theta2, theta2dot (not six). Try function dydt = ODEsystem(t,y) k...

etwa ein Monat ago | 1

How to prove the positivity if this function?

Hi Andrea, What might constitute a proof using Matlab is a good question. If the answer to isAlways(y>=0) had come out as 1, w...

etwa ein Monat ago | 0

fixing of random number

Hi Irani, If I understand your question correctly, rng(1) Y = randi(10) rng('shuffle') node = randi(20) gives the same val...

etwa ein Monat ago | 0

| accepted

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...

etwa ein Monat 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_...

etwa 2 Monate 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)...

etwa 2 Monate 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...

etwa 2 Monate 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...

etwa 2 Monate 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...

2 Monate 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 ...

2 Monate 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 ...

2 Monate 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.

2 Monate 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...

2 Monate 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...

2 Monate 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 ...

3 Monate 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(...

3 Monate ago | 1

| accepted