Answered

Find the 5-point DFT of the sequence:

The code posted has a few issues. The second line is: >> u = sin(j) u = 0.0000e+00 + 1.1752e+00i >> whos u Name...

Find the 5-point DFT of the sequence:

The code posted has a few issues. The second line is: >> u = sin(j) u = 0.0000e+00 + 1.1752e+00i >> whos u Name...

1 month ago | 0

| accepted

Answered

Cannot compute Riccati solution for LQI controller

I'm not sure it's relevant, but should the fifth row of SYS.c be all zeros? I suspect the issue is with stabilizability of the ...

Cannot compute Riccati solution for LQI controller

I'm not sure it's relevant, but should the fifth row of SYS.c be all zeros? I suspect the issue is with stabilizability of the ...

1 month ago | 0

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Answered

How to solve a symbolic complex equation with real and imaginary parts?

I'm not sure what "change the paramters of the solve function" means. If a general apprach is desired, maybe something along the...

How to solve a symbolic complex equation with real and imaginary parts?

I'm not sure what "change the paramters of the solve function" means. If a general apprach is desired, maybe something along the...

1 month ago | 1

| accepted

Answered

Problem with integrating Sin to Cos

If you just want ode in terms of cos() >> ode = int(sin(n*x),x,0,pi/2) ode = (2*sin((pi*n)/4)^2)/n >> rewrite(ode,'...

Problem with integrating Sin to Cos

If you just want ode in terms of cos() >> ode = int(sin(n*x),x,0,pi/2) ode = (2*sin((pi*n)/4)^2)/n >> rewrite(ode,'...

1 month ago | 0

Answered

Simbolic simplification of trigonometric functions

How about this: >> simplify(f,500) ans = -(sin(x)*(- sin(x)^2 - c)^(1/2)*(sin(x)^2 - 1)^2)/(2*d^2)

Simbolic simplification of trigonometric functions

How about this: >> simplify(f,500) ans = -(sin(x)*(- sin(x)^2 - c)^(1/2)*(sin(x)^2 - 1)^2)/(2*d^2)

1 month ago | 1

| accepted

Answered

How to generate correlated samples from a single distribution? Each sample should be correlated with the previous.

I don't think the questionn is well posed. The question and the code make it sound like there is a single distribution and the s...

How to generate correlated samples from a single distribution? Each sample should be correlated with the previous.

I don't think the questionn is well posed. The question and the code make it sound like there is a single distribution and the s...

1 month ago | 0

Answered

how can i use symsum to make function with a variable apart from syms k?

This code works for the specified sequences. It would need to be modified if either x[n] or y[n] take on non-zero values for n <...

how can i use symsum to make function with a variable apart from syms k?

This code works for the specified sequences. It would need to be modified if either x[n] or y[n] take on non-zero values for n <...

1 month ago | 0

Answered

Problems with the controllability matrix.

ctrb() in the Control System Toolbox only accepts numeric inputs. If you have numeric values for the variables, you can substit...

Problems with the controllability matrix.

ctrb() in the Control System Toolbox only accepts numeric inputs. If you have numeric values for the variables, you can substit...

1 month ago | 0

| accepted

Answered

Making a transformation matrix in matrix format

You're not getting 4, 1 x 4 matrices. It just looks like that because of the formatting to the diplay. >> syms th d alph l A...

Making a transformation matrix in matrix format

You're not getting 4, 1 x 4 matrices. It just looks like that because of the formatting to the diplay. >> syms th d alph l A...

1 month ago | 0

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Answered

How to shift state space models by equilibrium points using ss and lsim?

The states, inputs, and outputs of Sys are all perturbations from the equilibrium solution. The intiial condition to lsim (x0) w...

How to shift state space models by equilibrium points using ss and lsim?

The states, inputs, and outputs of Sys are all perturbations from the equilibrium solution. The intiial condition to lsim (x0) w...

1 month ago | 0

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Answered

Differntial equations and Initial conditions

The initial conditions are set to represent the initial conditions of the system to be simulated. What other considerations migh...

Differntial equations and Initial conditions

The initial conditions are set to represent the initial conditions of the system to be simulated. What other considerations migh...

1 month ago | 0

| accepted

Answered

Matlab Code for DTFT to get frequency response

n, h, and w are all defined as row vectors and the * operator is trying to do matrix multiplication. But what you really want i...

Matlab Code for DTFT to get frequency response

n, h, and w are all defined as row vectors and the * operator is trying to do matrix multiplication. But what you really want i...

1 month ago | 0

Answered

Help with simplifying a complex symbolic expression

This code eliminates U_j0: [num,den]=numden(term1); newnum = combine(num,'log','IgnoreAnalyticConstraints',true); newterm1 = ...

Help with simplifying a complex symbolic expression

This code eliminates U_j0: [num,den]=numden(term1); newnum = combine(num,'log','IgnoreAnalyticConstraints',true); newterm1 = ...

1 month ago | 0

| accepted

Answered

Laplace Transform for ODE - RC Circuit

I think that last subs command is getting confused because q is defined as the solution of the ode. I'm not sure why that's a pr...

Laplace Transform for ODE - RC Circuit

I think that last subs command is getting confused because q is defined as the solution of the ode. I'm not sure why that's a pr...

1 month ago | 1

| accepted

Answered

Fourier Transformation of dirac comb

There is one too many points in the signal y. If you plot([y y]) and zoom in you'll see the pulse at sample 1001 immediately ...

Fourier Transformation of dirac comb

There is one too many points in the signal y. If you plot([y y]) and zoom in you'll see the pulse at sample 1001 immediately ...

2 months ago | 1

| accepted

Answered

Convert s in j*ω in a transfer function

No need to change anything in sys. It is a tf object and either freqresp() or bode() can evaluate sys at s = j*w doc freqresp ...

Convert s in j*ω in a transfer function

No need to change anything in sys. It is a tf object and either freqresp() or bode() can evaluate sys at s = j*w doc freqresp ...

2 months ago | 1

| accepted

Answered

How to find DTFT of given sequence in matlab

Assuming that y(n) = 0 for abs(n) > 5, there are are only three values of n for which y(n) is non-zero. Put those values of n an...

How to find DTFT of given sequence in matlab

Assuming that y(n) = 0 for abs(n) > 5, there are are only three values of n for which y(n) is non-zero. Put those values of n an...

2 months ago | 0

Answered

Printing out pi as a symbol in equations instead of the numerical value

If I understand the problem, it appears the idea is to define a function, an_Id, that can be used for both numerical evaluation ...

Printing out pi as a symbol in equations instead of the numerical value

If I understand the problem, it appears the idea is to define a function, an_Id, that can be used for both numerical evaluation ...

2 months ago | 0

Answered

probability - execution of an operation

If T has a normal distribution, then doc normcdf can be used to find the probability P(T < t)

probability - execution of an operation

If T has a normal distribution, then doc normcdf can be used to find the probability P(T < t)

2 months ago | 0

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Answered

Calculating and Plotting Weibull Distribution Function(wblpdf) with Cell Arrays

Here's an example that you might be able to adapt to your needs. >> params = {[1 2];[2 3];[3 4]}; % define cell array with par...

Calculating and Plotting Weibull Distribution Function(wblpdf) with Cell Arrays

Here's an example that you might be able to adapt to your needs. >> params = {[1 2];[2 3];[3 4]}; % define cell array with par...

2 months ago | 0

| accepted

Answered

I want to find where the root locus branches cross the y axis.

One option would be to use the return values of rlocus: [r,K]=rlocus(G1) to get a coarse idea of the value of K that results i...

I want to find where the root locus branches cross the y axis.

One option would be to use the return values of rlocus: [r,K]=rlocus(G1) to get a coarse idea of the value of K that results i...

2 months ago | 1

| accepted

Answered

Convert transfer function writing form

Maybe something like this: >> H = tf([15 25 1],[5 0 5],-1) H = 15 z^2 + 25 z + 1 ----------------- 5 z^2 + 5...

Convert transfer function writing form

Maybe something like this: >> H = tf([15 25 1],[5 0 5],-1) H = 15 z^2 + 25 z + 1 ----------------- 5 z^2 + 5...

2 months ago | 1

| accepted

Answered

Is it possible to manually connect the ABCD matrices to obtain the ss representation

Need to modify two lines of code as follows: clc; clear all; k = 1; m = 1; b = 1; A = [0 1; -k/m -b/m]; B = [0 1/m]'; C ...

Is it possible to manually connect the ABCD matrices to obtain the ss representation

Need to modify two lines of code as follows: clc; clear all; k = 1; m = 1; b = 1; A = [0 1; -k/m -b/m]; B = [0 1/m]'; C ...

2 months ago | 0

| accepted

Answered

c2d with 'impulse' method

I don't think you can use c2d() and get z/(z-1) with a sample time T = 0.1. In, short, the factor of 0.1 is needed to have the ...

c2d with 'impulse' method

I don't think you can use c2d() and get z/(z-1) with a sample time T = 0.1. In, short, the factor of 0.1 is needed to have the ...

2 months ago | 0

| accepted

Answered

Plotting a bode diagram without transfer function, using only magnitude and phase and frequency

You can use the data you have to make an frd model: doc frd Once you have the frd model you can make the bode plot using the b...

Plotting a bode diagram without transfer function, using only magnitude and phase and frequency

You can use the data you have to make an frd model: doc frd Once you have the frd model you can make the bode plot using the b...

2 months ago | 0

Answered

How to programmatically know if a block is a sink block?

I'm actually suprised that there's not an easier way to to do this. The BlockType is a read-only so checking: ismember(get_par...

How to programmatically know if a block is a sink block?

I'm actually suprised that there's not an easier way to to do this. The BlockType is a read-only so checking: ismember(get_par...

2 months ago | 0

Answered

Symsum function for basic electrical engineering calculations.

symsum() is a function in the Symbolic Math Toolbox and takes in symbolic inputs. If I understand that code correctly, all of th...

Symsum function for basic electrical engineering calculations.

symsum() is a function in the Symbolic Math Toolbox and takes in symbolic inputs. If I understand that code correctly, all of th...

2 months ago | 0

| accepted

Answered

How can I evaluate characteristic functions in MatLab?

The CF is the Fourier transform of the pdf. Approximate the pdf as a sum of line segments. Take the sum of the Fourier transfor...

How can I evaluate characteristic functions in MatLab?

The CF is the Fourier transform of the pdf. Approximate the pdf as a sum of line segments. Take the sum of the Fourier transfor...

2 months ago | 2

| accepted

Answered

Defined domain integral(convoulution) in simulink

Assuming h is constant and h >= 0 .... It seems like the model can be expressed as follows: wdot(t) = A*w(t) + B*u(t) z(t) = ...

Defined domain integral(convoulution) in simulink

Assuming h is constant and h >= 0 .... It seems like the model can be expressed as follows: wdot(t) = A*w(t) + B*u(t) z(t) = ...

2 months ago | 0

Answered

solving integral equation where the unknow is the upper limit

Assuming T and T0 are positive, it looks like there are two values of T that will satisfy the equation. Not sure why your code i...

solving integral equation where the unknow is the upper limit

Assuming T and T0 are positive, it looks like there are two values of T that will satisfy the equation. Not sure why your code i...

2 months ago | 0