Question

How to Solve a System of Equations for symfun Objects?
Suppose I have a system of equations: syms R E Y G eq1 = Y == G*E; eq2 = E == R-Y; Solve for Y and E in terms of R sol = so...

1 year ago | 2 answers | 0

2

answers

Answered
question about dely lines
One can attack this symbolically if the parameters in the problems aren't known. If they are, one can proceed numerically using ...

1 year ago | 0

Answered
How to use the diagonal symbol matrix？
Need to specify the vars explicitly if defined individually syms a1 a2 a3 A = diag([a1,a2,a3]) M = matlabFunction(2*A,'Vars',...

1 year ago | 1

| accepted

Answered
how can plot the region of convergence?
Since 2024a, radiusregion looks like a reasonable approach to get started. For example, suppose the region of convergence is 0....

1 year ago | 0

Answered
What is default Mu for Vehicle Body 3 DOF block?
As best I can tell, if the [mu_r, mu_f] vector is not specified externally, then the block uses the parameter specified in Nom...

1 year ago | 0

| accepted

Answered
Why the filter has no output?
The function filter is only applicable for a discrete-time filter, not an analog filter. If you want to simulate the output from...

1 year ago | 0

Question

Why Do digitalFilter Object Functions Ignore the Filter's SampleRate Property?
Design a low pass filter lpFilt = designfilt('lowpassiir','FilterOrder',8, ... 'PassbandFrequency',35e3,'PassbandRipp...

1 year ago | 1 answer | 0

1

answer

Answered
Unable to create Bode plot of H(s)=(s+10)/(s(s+5)^2)
As shown after the edit of @Walter Roberson, the code runs fine here. Do you see the same output after executing the following c...

1 year ago | 0

Answered
How can I make the following heatmap smoother while preserving the contours outlined by the green line?
If you don't need specific features of heatmap, perhaps a pcolor with shading would be useful load DataMe pcolor(flipud(TPP)),...

1 year ago | 0

Answered
In simulink, how can I make a parameter of a simulink block continuously updated during the simulation time by MATLAB function block?
Hi Yeonghoon, One option to try would be the Parameter Writer. Don't know if the particular block and block parameter in questi...

1 year ago | 0

| accepted

Answered
Why does this integral of a relatively well behaved function return NaN values?
Hi Ryan, I think that individual terms in the integrand blow up to inf when evaluating in double precision. u = 10^6; % unit c...

1 year ago | 1

| accepted

Answered
ECEF 6DOF block - integrator initial conditions
Hi Thomas, Are you referring to 6DOF ECEF (Quaternion)? What exactly do you mean by the "body rate integrator"? Are you loggin...

1 year ago | 0

Answered
Filter Z Transform Manipulation
Define a filiter in Signal Processing Toolbox (SPT) and plot the frequency response fc = 300; fs = 1000; [b,a] = butter(6,fc/...

1 year ago | 0

Answered
discontinuous differential equations using inverse z transform?
It appears the goal is to derive a difference equation from the corresponding, discrete-time, transfer function. Define the tra...

1 year ago | 0

Answered
Problem using variable='z^-1' in Z transform with Z^-1 format
When specifying a tf in with Variable='z', the num and den are interpreted as being coefficients of descending powers of z num=...

1 year ago | 0

Answered
How do you get a symbolic answer for this z transform in MATLAB
With the default symbolic preferences sympref('default'); We have heaviside(0),disp(char(ans)) So the discrete-time unit ste...

1 year ago | 0

Answered
How to convert state space to transfer function.
See this answer for how to represent the state space model in the Control Systems Toolbox.

1 year ago | 0

| accepted

Answered
How can I plot a correct fft of cosine wave?
The problem statement is to plot the Fourier Transform of a cosine (cos(2*pi*t)), but sampled with sample frequency of fs=12Hz. ...

1 year ago | 0

Answered
Adding 0 value place holders to string array
s= [ "0, 74, 46, 94" "7, 64, 8" "8, 50, 32, 70" "6, 43" "3, 55, 47"] c = count(s,",") s = arrayfun(@(s,c) join([s,repmat...

1 year ago | 0

| accepted

Discussion

Would a General Hold/Release Functionality be a Good Feature for the Symbolic Toolbox?
The int function in the Symbolic Toolbox has a hold/release functionality wherein the expression can be held to delay evaluation...

1 year ago | 1

Answered
Problem with ctrbf() and its answer
Check the doc page ctrbf to see how A_bar etc. are arranged in terms of the uncontrollable and controllable portions.

1 year ago | 0

Answered
Open loop stability: Bode - Pole zero plot mismatch
Use the open-loop system developed by @Arkadiy Turevskiy in this comment sys=zpk([2.4*10^9*j -2.4*10^9*j], [-0.0000001 -11.5*10...

1 year ago | 0

Answered
Complex variable substitution using Symbolic Toolbox no working as expected.
% Define symbolic variables syms R81 R79 R80 C37 C67 T z fs %complex syms w s % complex % Define the frequency-domain transfe...

1 year ago | 0

| accepted

Answered
How to get PD parameters
Hi Hasan, Let's take a look at the code. s = tf('s'); Gp = 2 / (0.2 * s + 1); %pump Gv = (2.2 * 10^-3) * 2; %valve Gt = 2...

1 year ago | 0

Answered
Inverse fft doesn't match analytical formulation
Let's take things one step at a time and see where they lead. If we have Continous-Time Fourier Transform (CTFT) F(w) = 1/w^2 ...

1 year ago | 1

Question

What are All of the Variables in the Workspace on Answers?
What are all of these and should they be here? whos In particular, having an empty double named 'i' is not good as that can sc...

1 year ago | 1 answer | 0

1

answer

Question

Why is Documentation Missing When Installed Locally?
I have the documentation installed locally, but I just noticed that doc can't find the documenation for the Statistics and Machi...

1 year ago | 1 answer | 0

1

answer

Answered
Gradient Vector for partial derivative seems backward for dfdx
Hi Kevin, It turns out that nDfy only gives the correct result because of the symmetry. xo = 0.8; yo = 0.2; h = 0.01; ...

1 year ago | 1

| accepted

Answered
PID Controller Design by Pole Assignment
Hi Bahadir, I'm not sure if the code is implementing what it should, but the reason the result is coming back with Ki = bres = ...

1 year ago | 1

| accepted

Answered
Step response of transfer function different in ODE45 than in 'step' and 'lsim'
Hi dikkemulle, The compensation is different between the two cases. For the ode45 implementation (ignoring v_desired for simp...

1 year ago | 1

| accepted