Answered

Antipodal and Unipolar Analytical Curve

Hello James, For the analytical part, you get an exact match for the curves by replacing Pb_antipodal_analytical = erfc(sqrt(2...

Antipodal and Unipolar Analytical Curve

Hello James, For the analytical part, you get an exact match for the curves by replacing Pb_antipodal_analytical = erfc(sqrt(2...

4 months ago | 0

| accepted

Answered

Total Least squares error help. I tried a couple different things here, but i'm not exactly sure how to do a total least squares error. The numbers aren't making sense to me.

Hi Rian, the problem is that b is a column vector, but predictionvalues is a row vector. Using predictionvalues = m([0, 1, 2,...

Total Least squares error help. I tried a couple different things here, but i'm not exactly sure how to do a total least squares error. The numbers aren't making sense to me.

Hi Rian, the problem is that b is a column vector, but predictionvalues is a row vector. Using predictionvalues = m([0, 1, 2,...

4 months ago | 1

Answered

pearsrnd and pearspdf are not coherent for the Pearson IV distribution?

Hello Marco, It appears that you are implicating the pearson rand function here, but I believe the real culprit is the pearson ...

pearsrnd and pearspdf are not coherent for the Pearson IV distribution?

Hello Marco, It appears that you are implicating the pearson rand function here, but I believe the real culprit is the pearson ...

4 months ago | 1

| accepted

Answered

Problem with damping constant affecting displacement in a mass system displacement system

Hi Daneil, I don't see any signs that your calculation is incorrect, although in some cases you may have to run the calculation...

Problem with damping constant affecting displacement in a mass system displacement system

Hi Daneil, I don't see any signs that your calculation is incorrect, although in some cases you may have to run the calculation...

5 months ago | 0

| accepted

Answered

Interpolation schemes that produce positive second derivatives of the interpolant

Hi SW, Here is one way to go about it. The data has 10 closely spaced points and one well separated point x(11). Fit the firs...

Interpolation schemes that produce positive second derivatives of the interpolant

Hi SW, Here is one way to go about it. The data has 10 closely spaced points and one well separated point x(11). Fit the firs...

5 months ago | 0

Answered

3D Fourier Series fftn?

Hi sbr Absolutely this is a 3d fourier series. The reason that the normalization 1/8*LxLyLz does not depend on grid size is th...

3D Fourier Series fftn?

Hi sbr Absolutely this is a 3d fourier series. The reason that the normalization 1/8*LxLyLz does not depend on grid size is th...

5 months ago | 0

| accepted

Answered

Finding nice color bar limits automatically

Hi William, It looks like you want to move from the limits you have to some with fewer significant figures such as 1 or 2. Her...

Finding nice color bar limits automatically

Hi William, It looks like you want to move from the limits you have to some with fewer significant figures such as 1 or 2. Her...

5 months ago | 0

| accepted

Answered

What are the point locations for EHfields() function output?

Hi XC, I don't have the antenna toolbox but there are definite indications that they are using the sphere command. Sphere has ...

What are the point locations for EHfields() function output?

Hi XC, I don't have the antenna toolbox but there are definite indications that they are using the sphere command. Sphere has ...

5 months ago | 0

| accepted

Answered

Antenna Element Calibration File Size Calculation

Hi John, assuming the required memory is the product of those four factors, then if these are 64 bit floating point real number...

Antenna Element Calibration File Size Calculation

Hi John, assuming the required memory is the product of those four factors, then if these are 64 bit floating point real number...

5 months ago | 0

Answered

Reciprocity mismatch using geodetic2aer and aer2geodetic

Hi Leonardo, There is no reason for the reciprocity you mentioned to hold true. This has to be the case since the aer coodinat...

Reciprocity mismatch using geodetic2aer and aer2geodetic

Hi Leonardo, There is no reason for the reciprocity you mentioned to hold true. This has to be the case since the aer coodinat...

5 months ago | 0

Answered

Can I assign vectors with different number of rows per-column to a matrix?

Hi Abdallah, Cell arrays are very versatile but they are also on the slow side. Depending on what you are doing, that may not ...

Can I assign vectors with different number of rows per-column to a matrix?

Hi Abdallah, Cell arrays are very versatile but they are also on the slow side. Depending on what you are doing, that may not ...

5 months ago | 0

Answered

How do I solve this ODE system where there exists derivatives in both sides?

Hi Arda, These two equations are of the form p' Jxx - r' Jxz = f(...) where ... = p,q,r,J,J,M,M (a bunch of known stu...

How do I solve this ODE system where there exists derivatives in both sides?

Hi Arda, These two equations are of the form p' Jxx - r' Jxz = f(...) where ... = p,q,r,J,J,M,M (a bunch of known stu...

6 months ago | 0

| accepted

Answered

How can I create randomly scattered points between two circles?

(At Adam's suggestion I moved my previous comment to this answer) What tells the tale is the differential area element in the (...

How can I create randomly scattered points between two circles?

(At Adam's suggestion I moved my previous comment to this answer) What tells the tale is the differential area element in the (...

6 months ago | 3

Answered

Hi, everyone! I have a question about generating random meshgrid.

Hello yc, If you are willing to make an approximation to the area of each grid quadrilateral then I think there is a reasonably...

Hi, everyone! I have a question about generating random meshgrid.

Hello yc, If you are willing to make an approximation to the area of each grid quadrilateral then I think there is a reasonably...

6 months ago | 0

| accepted

Answered

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...

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...

6 months ago | 0

| accepted

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...

6 months 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...

7 months 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...

7 months 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))) ...

7 months 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 ...

7 months 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 ...

7 months 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...

7 months 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...

8 months 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...

9 months 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...

9 months 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...

9 months 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 ...

9 months 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.*...

10 months 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...

10 months 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...

10 months ago | 1