Answered
Discrete-time Simulink not matching Matlab Connect()
Hi John, Check this comment for an example that shows the same open loop system obtained from the combination of connect and ge...

2 months ago | 0

Answered
Do source blocks in Simulink have an implicit unit step function built into them?
For the top path: Y(s) = s/(s+1)*X(s) = 1/(s+1) * (s*X(s)) The differentation rule for the one-sided Laplace transform is: L(...

2 months ago | 1

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Answered
Find the 3D components-based row of an array that most closely matchs a given vector
I think the specific solution would depend on the figure of merit for defining "closeness" of two vectors. For example, if the ...

2 months ago | 0

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Why are subsystems highlighted in different color after simulation
Hi Neelabh, It looks like it might be due to Sample Time Colors. Go to Debug -> Information Overlays and see if the Sample Time...

2 months ago | 0

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Answered
Execute Matlab function in Simulink
You are correct. In Matlab, the code looks like this (actually making the call to moving_average2) t = 0:0.1:10; u = sin(t); ...

2 months ago | 0

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Answered
why am i getting the error "Incorrect number or types of inputs or outputs for function step."
Hi Salim Your code runs fine here. What version of Matlab are you using? I just changed the code to make separate plots intead...

2 months ago | 0

Answered
ifft convert frequency domain to time domain
Hi Angie, The input to ifft should cover all frequencies from 0 to Fs - df, where df is the frequency step. In this case, max(f...

2 months ago | 1

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Answered
How to automatically reinitialize the model workspace when Run Simulink model
Hi Steven, Model workspaces can be manipulated programatically In your workflow, create a model workspace object and use reloa...

2 months ago | 0

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Answered
Symbolic expressions with pi are displaying as decimals
Hi Nathaniel. Option 1: Always use sym(pi); in symbolic expressions. For example 5.13445677*sym(pi) If you use the numeric ...

2 months ago | 1

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Why does augw(P, W1, W2, W3) give a much lower order generalized plant when compared to the by hand construction?
Hi Vinh, The 'by-hand' construction is nearly certainly not what augw actually does. You can look at the augw code; maybe it wi...

3 months ago | 1

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Answered
How to use freqz to plot the frequency response from neg frequency to pos frequency
Use the third argument to freqz to specify the desired frequency points: f_sampling = 40e3; % sampling frquency f_pass = 10e3;...

3 months ago | 0

Answered
Need help substituting vector variables into symbolic expression
syms x y Option 1. Use a symbolic function z(x,y) = x + y z([1 2],[100 200]) Option 2. Symbolic expression, subs with a cell...

3 months ago | 0

Answered
Discrete Derivative block (Simulink) behaves differently than expected
Hi John, How did you get the yellow colors on the rate transition blocks on the signals coming out of those? If you turned on ...

3 months ago | 0

Answered
Matlab is not giving the correct z transform of - (n*a^n)*u[- n - 1];
In addition to what @VBBV said about a typo in the defintion of y[n], there are two other fundamental problem that needs to be a...

3 months ago | 1

Answered
Fourier transform of derivative expression with respect to time
Hi Erikan, I'm not clear what you're asking about how j*w should be calculated. It's just part of the expression. If you're as...

3 months ago | 0

Answered
What's the difference between two command?
That's the old, obsolete form of nyquist() that was used for state space models before the Control System Toolbox introduced lti...

3 months ago | 2

Question

What is the Distinction Between Answers and Discussions?
I just now discovered Discussions. Can anyone provide insight into the intended difference between Discussions and Answers and ...

3 months ago | 3 answers | 2

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answers

Answered
Given an LTI system with corresponding transfer matrix K(s), is there an easy way to specify K(w) where w=s+delta?
Hi Vinh, I think the substitution backward. It should go like this: K(s) = C * inv(s*I - A) * B + D w = s + delta -> s = w ...

3 months ago | 0

Answered
designfilt error in loop
In this messsage "Error in designfilt (line 189)," the "line 189" is refering to the line number in designfilt, not your code. ...

3 months ago | 0

Answered
Convert Quaternion to Euler angle extrinsically
Hi Frank, According to a comment in this answer, there appears to be no function in any toolbox that works with extrinsic Euler...

3 months ago | 0

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Why the Hilbert transform is not correct using the hilbert function in Matlab?
I think the issue is that the assertion that the "Hilbert transform of cos is sin" is not correct for this problem. According to...

3 months ago | 0

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How to do a Biquad (SOS) filtering
Hi Jay, I think it works like this if you want to cascade the filters together into a single, sos filter. %% Filter_1 h = fde...

3 months ago | 0

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Answered
Kalman filter for input estimation
The steady-state Kalman filter as implemented by kalman requires that the augmented realization be detectable, as opposed to mi...

3 months ago | 0

Answered
Discrete z to convert z^-1
z = zpk('z',-1); H = 0.0004773 * (z+0.9544)/ (z-0.9591) / (z-0.9064) H.Variable = 'z^-1'

3 months ago | 0

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Answered
Multiple Bandpass Filter Creation
fs = 16e3; %range = [50 8000]; CF1=linspace(50, 8000, 32) -50; CF2=linspace(50, 8000, 32) +50; Can't use the first and las...

3 months ago | 1

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Answered
Calculus Variational; code for finding the value of two constants for 2 values of the variable
Boundary conditions can be specified in the call to dsolve syms x(t) f = diff(x,t)^2+10*t*x eqn = functionalDerivative(f,x) ...

3 months ago | 2

Answered
Pole Placement Techniques Part 2
Hi MUHAMMAD, See some comments interspersed with the code below. clc; clear Here, we define the sysem in original form. % (1...

3 months ago | 0

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Answered
Structured H infinity synthesis can't find a controller that makes closed loop stable even with an asymptotically stable plant?
Hi Vinh, I'll say up front that I don't have a complete solution to your problem, but I have an observation that I'm pretty sur...

3 months ago | 1

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Answered
Regarding Pole Placement Techniques
A = [0 -83.33; 500 -10]; B = [166.67; 0]; C = [0 1]; D = 0; %Create state-space and convert to transfer function sys = ss(A...

3 months ago | 1

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Answered
phase jumps in dtft
n=-20:20; w=-2.5*pi:.01:2.5*pi; x1=zeros(size(n)); x1(n>=-2 & n<=2)=1; % x1(19:23)=1; Matlab doesn't have a function dtft. ...

3 months ago | 0