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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...

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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...

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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...

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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...

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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...

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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...

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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.

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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...

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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 ...

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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...

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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 ...

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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...

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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...

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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 ...

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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...

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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 ...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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 = [...

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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...

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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...

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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...

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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)) ...

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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...

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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 =...

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