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Paul


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188 total contributions since 2011

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Answered
why my plot is not correct?
If you're looking for a plot with odd symmetry, try: plot(x,nthroot(x,3)) % check doc nthroot for details

ongeveer 7 uur ago | 1

Answered
Display rotation matrix with s1, c1, etc. in place of sind(theta1), cosd(theta1), etc. respectively.
Use subs: >> doc subs >> syms theta1 s1 c1 >> A=[cos(theta1) sin(theta1);-sin(theta1) cos(theta1)] A = [ cos(theta1)...

ongeveer 22 uur ago | 0

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Answered
Why is the convolution so different from the analytical answer?
When approximating the continuous convolution with a discrete convoluton, the discrete convolution needs to be multilplied by dt...

1 dag ago | 1

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Answered
Plotting responses other than step responses to transfer function
Looks like an fplot() confusion issue. This code results in the expected plot: >> syms t; y(t) = ilaplace(1/s*poly2sym(T.Numera...

1 dag ago | 0

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...

3 dagen ago | 0

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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 ...

4 dagen 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...

5 dagen ago | 1

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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,'...

8 dagen 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)

8 dagen ago | 1

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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...

12 dagen 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 <...

12 dagen 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...

12 dagen ago | 0

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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...

12 dagen 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...

14 dagen 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...

14 dagen ago | 0

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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...

16 dagen 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 = ...

16 dagen ago | 0

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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...

18 dagen ago | 1

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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 ...

20 dagen ago | 1

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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 ...

20 dagen ago | 1

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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...

21 dagen 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 ...

22 dagen ago | 0

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

22 dagen 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...

28 dagen ago | 0

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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...

28 dagen ago | 1

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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...

28 dagen ago | 1

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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 ...

30 dagen ago | 0

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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 ...

30 dagen ago | 0

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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...

ongeveer een maand 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...

ongeveer een maand ago | 0

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