Answered

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 ...

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 ...

2 días ago | 2

| accepted

Answered

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...

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...

6 días ago | 0

Answered

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 ...

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 ...

9 días ago | 1

| accepted

Answered

Problem in performing IFFT

Hi Susmita, A couple of things going on here. First, it's good to use more points. Use a lot more points. There is no need t...

Problem in performing IFFT

Hi Susmita, A couple of things going on here. First, it's good to use more points. Use a lot more points. There is no need t...

13 días ago | 0

| accepted

Answered

Obtaining the envelope of AM signal using hilbert transform

Hi Bernardo, I don't think there is much doubt that the effect is due to a DC offset in the signal. In your figure, both the r...

Obtaining the envelope of AM signal using hilbert transform

Hi Bernardo, I don't think there is much doubt that the effect is due to a DC offset in the signal. In your figure, both the r...

18 días ago | 2

Answered

Inserting new element after each element of an array

Hi Neeraj, not having the communications toolbox I used dec2bin instead, which gives a character array but it is basically the ...

Inserting new element after each element of an array

Hi Neeraj, not having the communications toolbox I used dec2bin instead, which gives a character array but it is basically the ...

19 días ago | 0

Answered

Difference of amplitude after FFT calculation

Hi SO, The y array consists of (supposedly) just one frequency, but aside from the scaling your plot shows spread-out frequency...

Difference of amplitude after FFT calculation

Hi SO, The y array consists of (supposedly) just one frequency, but aside from the scaling your plot shows spread-out frequency...

19 días ago | 0

| accepted

Answered

Natural Cubic Spline interpolation

Hi Bella, you can get the coefficients of the piecewise polynomials for each segment with pp = interp1(x,y,'spline','pp') or ...

Natural Cubic Spline interpolation

Hi Bella, you can get the coefficients of the piecewise polynomials for each segment with pp = interp1(x,y,'spline','pp') or ...

25 días ago | 0

Answered

solving simultaneous equations of fourth order PDE in MATLAB

Hello Devansh Since you have boundary conditions at both x=0 and x=L you can use bvp4c to solve this. But I believe you have t...

solving simultaneous equations of fourth order PDE in MATLAB

Hello Devansh Since you have boundary conditions at both x=0 and x=L you can use bvp4c to solve this. But I believe you have t...

27 días ago | 0

Answered

the final result of laplace transform still contain laplace function?

Hello ZH Matlab doesn't know if taoc is positive or negative. If taoc is negative, the calculation can't really be done. Tha...

the final result of laplace transform still contain laplace function?

Hello ZH Matlab doesn't know if taoc is positive or negative. If taoc is negative, the calculation can't really be done. Tha...

alrededor de 1 mes ago | 1

Answered

Help With ODEs Solver(ode45)

Hi Ahmed, repeating the plot command every time in the nested for loops is not helping, For a smaller case (I didn't want to w...

Help With ODEs Solver(ode45)

Hi Ahmed, repeating the plot command every time in the nested for loops is not helping, For a smaller case (I didn't want to w...

alrededor de 1 mes ago | 1

| accepted

Answered

Symbolic differentiation of Bessel functions is incorrect

Hi Sam, There is really nothing going on. Both of those identities are correct, as you can check numerically. There are sever...

Symbolic differentiation of Bessel functions is incorrect

Hi Sam, There is really nothing going on. Both of those identities are correct, as you can check numerically. There are sever...

alrededor de 1 mes ago | 0

| accepted

Answered

Permutation matrix P in the qr function

Hello Gabriele, I don't think you can conclude anything about the columns of A. That's because the usual qr decomposition is u...

Permutation matrix P in the qr function

Hello Gabriele, I don't think you can conclude anything about the columns of A. That's because the usual qr decomposition is u...

alrededor de 1 mes ago | 0

| accepted

Answered

Antenna radiation pattern rotation

Hi Marina, Since you are using surf, I am going to assume that you have three matrices x,y,z, each of size m x n, appropriate t...

Antenna radiation pattern rotation

Hi Marina, Since you are using surf, I am going to assume that you have three matrices x,y,z, each of size m x n, appropriate t...

alrededor de 1 mes ago | 1

| accepted

Answered

How to create an average of 2 lines on a single graph

Hi Charley since the second half of the distance array has exactly the same values as the first half (only reversed), you can u...

How to create an average of 2 lines on a single graph

Hi Charley since the second half of the distance array has exactly the same values as the first half (only reversed), you can u...

alrededor de 1 mes ago | 0

Answered

Euler Angles from Rotation Matrix

Hi Gregory, If you mean you want the form of the rotation martrix in terms of alpha,beta,gamma, that's just syms a b g R1 = [...

Euler Angles from Rotation Matrix

Hi Gregory, If you mean you want the form of the rotation martrix in terms of alpha,beta,gamma, that's just syms a b g R1 = [...

alrededor de 1 mes ago | 1

| accepted

Answered

roots of the complex equation with one variables

Hello Varun, Your code gives for solutions b = 30.857 - 175.74i -94.032 - 211.56i 70.398 - 342.7...

roots of the complex equation with one variables

Hello Varun, Your code gives for solutions b = 30.857 - 175.74i -94.032 - 211.56i 70.398 - 342.7...

alrededor de 1 mes ago | 0

Answered

multiple r values for multiple theta values

Hi Allan For an element-by-element calculation, use ./ and .* rather than / and * theta=[pi,3,2.8,2.5,2,pi/2,1.3,1.0,0.75...

multiple r values for multiple theta values

Hi Allan For an element-by-element calculation, use ./ and .* rather than / and * theta=[pi,3,2.8,2.5,2,pi/2,1.3,1.0,0.75...

alrededor de 1 mes ago | 1

Answered

Modifying 'Bessel second-order ordinary differential equation' in matlab library.

Hi K^2, Picking kr as the argument, take a look at J(kr) and do the differentiations on d^2/dr^2 J(kr) + (1/r) d/dr(J(kr). Ta...

Modifying 'Bessel second-order ordinary differential equation' in matlab library.

Hi K^2, Picking kr as the argument, take a look at J(kr) and do the differentiations on d^2/dr^2 J(kr) + (1/r) d/dr(J(kr). Ta...

alrededor de 1 mes ago | 0

| accepted

Answered

solving a system of 2nd order 2 ODE: output vector length not matching the initial condition vector length

Hi yosri, the reason this is happening is that the expression for dy/dt has four elements, but one of them contains diff(y(4)) ...

solving a system of 2nd order 2 ODE: output vector length not matching the initial condition vector length

Hi yosri, the reason this is happening is that the expression for dy/dt has four elements, but one of them contains diff(y(4)) ...

alrededor de 1 mes ago | 0

Answered

Create a vector field

Hi ALvaro, The code below sets P=Q=0 to make the spacial dependence more clear. Rather than meshgridding the 1d velocity vecto...

Create a vector field

Hi ALvaro, The code below sets P=Q=0 to make the spacial dependence more clear. Rather than meshgridding the 1d velocity vecto...

alrededor de 1 mes ago | 0

| accepted

Answered

how can i calculate z^2 distibution?

Hello JS By gaussian I assume you mean the normal distribution, mean 0, std deviation 'a' f(z) = N*exp(-(z/a)^2/2) with N =...

how can i calculate z^2 distibution?

Hello JS By gaussian I assume you mean the normal distribution, mean 0, std deviation 'a' f(z) = N*exp(-(z/a)^2/2) with N =...

alrededor de 1 mes ago | 0

| accepted

Answered

Solve function returns expression in terms of z

Hello Ashmika, You do have a symbolic solution for h, which goes to show that symbolic solutions are not always the ideal. The...

Solve function returns expression in terms of z

Hello Ashmika, You do have a symbolic solution for h, which goes to show that symbolic solutions are not always the ideal. The...

alrededor de 1 mes ago | 0

| accepted

Answered

How can I get randperm to return a permutation of a vector that has no entries at their original positions?

Hi Darcy, the methods I have seen here seem to involve trying randperm and rejecting the result if an element remains in the sa...

How can I get randperm to return a permutation of a vector that has no entries at their original positions?

Hi Darcy, the methods I have seen here seem to involve trying randperm and rejecting the result if an element remains in the sa...

alrededor de 1 mes ago | 0

Answered

Imaginary numbers when solving ode (ode15s)

Hello YF, whenever unexpected complex quantities start appearing, it's time to look for the usual suspects, which tend to be ei...

Imaginary numbers when solving ode (ode15s)

Hello YF, whenever unexpected complex quantities start appearing, it's time to look for the usual suspects, which tend to be ei...

alrededor de 2 meses ago | 0

| accepted

Answered

Q Factor is not same

Hello Abdullah be aware that what you are calling alpha is often called alpha/2, but I don't think that had anything to do with...

Q Factor is not same

Hello Abdullah be aware that what you are calling alpha is often called alpha/2, but I don't think that had anything to do with...

alrededor de 2 meses ago | 1

| accepted

Answered

How does nanstd function process complex numbers

Hi Luciano I'm not sure what you are referrng to with " nanstd(C) returns a complex matrix with dimentions equal to C and rea...

How does nanstd function process complex numbers

Hi Luciano I'm not sure what you are referrng to with " nanstd(C) returns a complex matrix with dimentions equal to C and rea...

alrededor de 2 meses ago | 0

Answered

Power calculation from Voltage and current waveforms

Hi Stefano, The biggest issue is that when using trapz, you have not taken into account the width of the time steps when doing ...

Power calculation from Voltage and current waveforms

Hi Stefano, The biggest issue is that when using trapz, you have not taken into account the width of the time steps when doing ...

alrededor de 2 meses ago | 0

Answered

FFT and Parseval's Theorem

Hi Chen, Here are a couple of ways. Since the time function fills up the entire time window (as opposed to being some kind of ...

FFT and Parseval's Theorem

Hi Chen, Here are a couple of ways. Since the time function fills up the entire time window (as opposed to being some kind of ...

alrededor de 2 meses ago | 1

Answered

In the sine wave source is the formula that links samples per period and sample time correct? It says: Samples per period = 2*pi / (Frequency * Sample time), but I believe it should be Samples per period = Sample time / Frequency.

Hello Ilaria, I believe it is neither of those. Rather it is what is in the PNG with the 2pi crossed out: samples/period = 1/...

In the sine wave source is the formula that links samples per period and sample time correct? It says: Samples per period = 2*pi / (Frequency * Sample time), but I believe it should be Samples per period = Sample time / Frequency.

Hello Ilaria, I believe it is neither of those. Rather it is what is in the PNG with the 2pi crossed out: samples/period = 1/...

alrededor de 2 meses ago | 0