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Voltage peaks after opening of a contactor in an inductive circuit
Hello Ivan, I'm not sure how you obtain 17.5kV from 500A and 50ns, and 50ns seems really fast if the contactor is mechanical, b...

4ヶ月前 | 0

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How to perform a coordinate transformation in a function?
Hi Kovacs Here is one way. Clearly x^2 + t^2 = xi^2 by inspection, so that factor, which is common to both terms, can be sav...

4ヶ月前 | 1

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How can I write "StruveL function" in matlab?
Hello Shreen, Here are two ways although you will need the symbolics toolbox for the first one. I used benign values for z and...

5ヶ月前 | 0

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This code runs except the graph and results are incredibly wrong
Hi Connor, The reason your code is going to 10^26 is that you are missing an important factor on the last line of rk4, which is...

5ヶ月前 | 0

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How to find the max Phase lead provided by a Compensator?
Hi Gidel, It's not a single command and it's numeric, but is w = 0:.001:10; maxangle = (180/pi)*max(angle((i*w+1)./(i*w+3))) ...

5ヶ月前 | 1

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impedance matching single stub
Hi Moza, You have most of it, but you need to add a step and change a sign error. The section terminated by R and C, I called ...

5ヶ月前 | 0

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11 kV phase to phase voltage, what is the value of phase to ground voltage?
Hi N^2 I believe the result should be Vgnd = 11000/sqrt(3) = 6351 V. However, if the 11000V is RMS, and the voltage to ground ...

5ヶ月前 | 0

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5 equations, 5 unknowns using fsolve; with scientific variables
Hi Kaushal, looks like 6 eqns 6 unknowns not 5. All of your unknowns appear in the numerators of the given expressions and no...

5ヶ月前 | 0

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Finding Coefficients for the particular solution
Hi Tashanda, let u and v be 2x1 vectors with the coefficient of cos as first element, coefficient of sine as second element, an...

6ヶ月前 | 0

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Power Spectrum estimate using pwelch function
Hi Matthew, I don't think there is an issue here, exactly. pxx_hamming1 is the default psd for pwelch. If you take pxx_hammin...

7ヶ月前 | 1

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Does MATLAB considers poles while COMPLEX integrating a function?
Hi simran, Yes, the 2F1 expression does consider the pole, as you can see by the fact that the expression gets large as z appoa...

7ヶ月前 | 1

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making a 4 x 3 matrix with elements from a 3x7 matrix
Hi Brandon, m1 = rand(3,7) m2 = m1(:,[1 3 4 5]).' m1 = 0.0357 0.6787 0.3922 0.7060 0.0462 0.6948 0...

7ヶ月前 | 0

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why FFT result and IFFT result has diffrent in very small value? how to avoid this to increase precission?
Hi nirwana, This is totally normal behavior, just computation being computation. Matlab uses double precision arithmetic with ...

7ヶ月前 | 0

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Finding positive-, negative- and zero-sequence components in Matlab
Hi Ygor, I believe the problem is that you are going too soon to real values for Ua,Ub,Uc. In Ua = ((exp(1i.*w1.*t)+exp(-1i.*...

8ヶ月前 | 1

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How to solve such integrations on MATLAB?
Hi simran, for any general function f(z) and a set of points [z1, z2, z3 ...] that describes a path in the complex plane (not n...

8ヶ月前 | 0

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How to do LU factorization without permutation？ The lu() is with permutation.
Hi Alvin Certainly you can do the decomposition without permutation, just not with Matlab lu. (Why you might want to is a diff...

8ヶ月前 | 1

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Period of a Linear Congruential Random Number Generator
HI William. If you're still listening, then if you are only interested in the period and not all of the values of x along the w...

8ヶ月前 | 0

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Dot product of two vector
Hello Syazana syms c1 s1 n1 n2 n3 a1 a2 a3 real A = [c1 -s1 0; s1 c1 0; 0 0 1] A = [c1, -s1, 0] [s1, c1,...

8ヶ月前 | 0

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Solve the integral in the point where the function is singular
Hi Dimani, Leaving out the first '1 ' term that has no singularity and leaving off some constants, you are basically looking at...

8ヶ月前 | 0

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How to generate a noise which sums up as zero?
Hi Ananta, noise=randn(1,64)*sqrt(0.001)*240 noise = noise - mean(noise); if you subtract off the mean, then the new sum of t...

9ヶ月前 | 0

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Trying to use modified secant method to solve for a theta over different g values.
Hi Carson, let b = g*d^2/(2*v^2) % a distance then your equation (multiplied by -1) is b/cos^2 - d*tan - y = 0 plug in ...

9ヶ月前 | 0

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I require frequency response from transfer function = 1/(s^2+(b/m)*s+k/m) where b= 0.0011, k= 87.88 , m = 0.99 in matlab and i need freq in khz
Hi sia, there is not much need to do any detailed calculation when your starting point is what it is. This system has a small a...

9ヶ月前 | 0

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Difference between 2 orientations
Hello Jonathan, You have two 3x3 rotation matrices, each expressed in terms of euler angles, Rrpha(:,1:3) = [cp.*ch, -sp, cp...

10ヶ月前 | 0

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Can't tell if exprnd is working correctly
Hi Umberto, I believe the issue happens because you are plotting the cumulative variables D1 and D2. Once the difference D1-D2...

10ヶ月前 | 0

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Raising a large sparse matrix to a large power
Hi if you are operating on 'a particular vector' v then you do not have to iterate as in m = m*m % iterate to form ...

10ヶ月前 | 2

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I’m thinking of make a command to change Hankel matrix into x time series
Hi Ahmed, here is one way y = magic(5) n = size(y,2); x = zeros(1,2*n-1); x(1:2:end) = diag(y).'; x(2:2:end) = diag(y,1)...

10ヶ月前 | 0

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How to find the width of a peak where there is no actual data, just individual points?
Hi Alfredo, Usually your ydata would be the frequency domain version of a linear quantity such as voltage or displacement. Hal...

10ヶ月前 | 1

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why the simulation period is wrong about schrodinger equation in a harmonic potential
Hi Daniel, Nice animation. Looks like in your 'hamiltonian' function, the kinetic energy is missing a factor of 1/2. Changing...

10ヶ月前 | 0

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Units for Thermal PDE thermalProperties Function
Hi Simon, The heat conduction equation is dT/dt = alpha (d^2/dx^2+d^2/dy^2+d^2/dz^2) T where alpha, the thermal diffusivity, ...

10ヶ月前 | 0

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solve 4 equations with some unknown coefficients.
Hi Ahmad, If the answers don't have to match up with the paper, that makes things easier. I took four equations very similar t...

10ヶ月前 | 0