Answered

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...

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 månader ago | 1

| accepted

Answered

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...

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 månader ago | 0

| accepted

Answered

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...

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 månader ago | 0

| accepted

Answered

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))) ...

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 månader ago | 1

Answered

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 ...

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 månader ago | 0

| accepted

Answered

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 ...

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 månader ago | 0

Answered

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 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 månader ago | 0

Answered

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...

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 månader ago | 0

| accepted

Answered

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...

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...

6 månader ago | 1

Answered

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...

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 månader ago | 1

| accepted

Answered

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...

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 månader ago | 0

| accepted

Answered

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 ...

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 månader ago | 0

| accepted

Answered

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.*...

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 månader ago | 1

| accepted

Answered

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...

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 månader ago | 0

Answered

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...

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 månader ago | 1

Answered

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...

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 månader ago | 0

| accepted

Answered

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,...

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 månader ago | 0

| accepted

Answered

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...

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 månader ago | 0

Answered

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...

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 månader ago | 0

Answered

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 ...

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 månader ago | 0

Answered

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...

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 månader ago | 0

Answered

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...

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 månader ago | 0

Answered

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...

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 månader ago | 0

Answered

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 ...

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 månader ago | 2

Answered

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)...

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 månader ago | 0

Answered

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...

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 månader ago | 1

| accepted

Answered

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...

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 månader ago | 0

| accepted

Answered

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, ...

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 månader ago | 0

| accepted

Answered

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...

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 månader ago | 0

Answered

looking for convenient way to extract matrix from 1*n*n

Hi YL, A=zeros(5,5,5) B=squeeze(sum(A,1)); Squeeze removes all singleton dimensions.

looking for convenient way to extract matrix from 1*n*n

Hi YL, A=zeros(5,5,5) B=squeeze(sum(A,1)); Squeeze removes all singleton dimensions.

11 månader ago | 0