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...

1 month 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 ...

1 month ago | 1

Answered
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...

1 month 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;...

1 month 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...

1 month 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 ...

2 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...

2 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...

2 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...

2 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 ...

2 months ago | 3 answers | 2

3

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 ...

2 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. ...

2 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...

2 months ago | 0

Answered
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...

2 months ago | 0

Answered
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...

2 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...

2 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'

2 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...

2 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) ...

2 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...

2 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...

2 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...

2 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. ...

2 months ago | 0

Answered
How can I add two fft functions?
Hi Anagha A=1; t=0:0.001:0.1; Here, the sampling frquency is 1000 Hz ... but the frequency of x is 1046 Hz. Assuming x shoul...

2 months ago | 0

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Answered
Comparing Analog Butterworth vs Bessel Filters shows large differences in coefficients and filtered data.
Hi Xavier, For "an analog Butterworth" filter, the code would be (butter) % All frequency values are in Hz. Fs = 20000; % Sa...

2 months ago | 0

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Question


Why Does Format of Data Returned from readtable() Depend on Import Options that are Not VariableTypes?
Here is the file type text1.csv When read without options, the table output is as expected. t1 = readtable('text1.csv') But ...

2 months ago | 2 answers | 1

2

answers

Answered
Apply Filter to Signal
I think this is the correct way to generate the output signal fs = 16e3; t = 0:(1/fs):1; % not defined in question numFilts=...

2 months ago | 1

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Answered
LQI with time-delay system
Yes, if using a Pade apporoximant for the time delay, then the Q matrix will have to be expanded to include the additional state...

2 months ago | 0

Answered
Error in port widths or dimensions.
If it makes sense that the outputs of each Fuzzy Logic Controller is 3, then there is a problem at the the output of the highlig...

2 months ago | 0

Answered
I have logged a signal from simulink to workspace in timeseries format and got 317 samples of that signal. Can i increase the number of samples i get or the sampling rate?
More samples of the logged signal can be collected by settng the Sample Time of the To Workspsace block to whatever sample time ...

2 months ago | 0

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