Beantwortet
location of second peaks in fft
Hi peter, The elements of the output of fft as implemented in Matlab correspond to angles around the unit circle. For an N-poin...

etwa 4 Jahre vor | 0

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integral of two added function can't be implemented
Hi Faisal, If the plot for the answer to Q4 is corret, then does the integration really need to start from -inf? However, I su...

etwa 4 Jahre vor | 0

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Symbolic dependency apparently sometimes gives wrong answers
Hi Mohammad, This works, at least for the examples cited in this comment. Haven't tested for anything but those examples. syms...

etwa 4 Jahre vor | 0

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how to find the area between sinx and sin2x with plot on range [0,pi] as from this code its giving negative area,?
Hi Aashay, After commenting out the code for pos and negArea that wouldn't run because y is not defined (and even if was define...

etwa 4 Jahre vor | 0

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Frage


Should ztrans Work Better when Using heaviside() ?
Recently ran across peculiar behavior with ztrans. Define some variables syms n integer syms T positive Set sympref so that ...

etwa 4 Jahre vor | 0 Antworten | 0

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how to make a sum of squares symbollically known to MATLAB for use in simplification
Hi Michael, simplify works for this case: syms a b c d x y z f = (a) * (b) * (c) * (1- x^2 - y^2 - z^2) * (d) assume(1 - x^...

etwa 4 Jahre vor | 0

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eigenvalue diagonalization in matlab
Does eig not provide the solution, assuming a solution exists?

etwa 4 Jahre vor | 0

Beantwortet
Measure Phase/Gain Margin from a different phase reference using margin()?
Hi Alex, I'd look at the problem as follows syms s T0 = sym(-97.74e3); % T0, the DC loop transmission f0 = sym(5); %...

etwa 4 Jahre vor | 0

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Beantwortet
How to get max of repeated values?
Can use splitapply C = [0.5000 0.5000 0.3000 1.0000 0.8000 0.3000 0.7000 0.7000 0.3000 0.4000 ...

etwa 4 Jahre vor | 0

Beantwortet
Getting Simulink compile-time error "Grid inputs must be vectors or the output of MESHGRID" even though I don't get that error when I try testing those lines in MATLAB
That's an odd error message insofar as interpn actually requires the the grid inputs to be the output of NDGRID (not MESHGRID) a...

etwa 4 Jahre vor | 0

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How to output a vector in MATLAB Function in Simulink?
One problem that I should have seen before is that this line [xdot_3,xdot_4] = Minv * [same stuff here]; should be temp = M_t...

etwa 4 Jahre vor | 0

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string extraction from a table
Age = [38;43;38;40;49;45;42;24;50;99]; Smoker = logical([1;0;1;0;1;1;1;0;0;1]); LastName = {'Brown_Howard';'Johnson';'Lee';'Di...

etwa 4 Jahre vor | 0

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Frage


Are Arithmetic Operations on a Cell Array of sym Objects Documented Behavior?
I inadvertently stumbled across this behavior: syms z H(z) = 1/(z+1) - 1/(z+2) c = children(H(z)) whos c c is a cell array ...

etwa 4 Jahre vor | 0 Antworten | 2

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Beantwortet
Simulink signal is double when it should be logical.
Hi Sam, Set the initial condition of the Delay block (or Unit Delay block, not sure which is being used) to false or true as de...

etwa 4 Jahre vor | 0

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Beantwortet
Displaying sum on plot
Use text rng(100) x = rand(10,1); % some data plot(x) text(1,.1,"Sum = " + string(sum(x))) Modify as needed

etwa 4 Jahre vor | 0

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Beantwortet
Graphing Fourier magnitude and phase spectra using fft, error: Array indices must be positive integers or logical values.
Hi Luke, At the line in question, we see that x(t) is non-integer numeric value, which can't be used to index into the array ff...

etwa 4 Jahre vor | 0

Beantwortet
matrix math problems , error in matrix size
Hard to say without without knowing anything about the data in the question. Based on the wording it should work as follows A =...

etwa 4 Jahre vor | 0

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Beantwortet
Creating a Closed loop transfer function of a model
Hi Jacob, Perhaps a clue is that the code doesn't use loop1 after it's computed. Once you have loop1, how does it relate to G2 ...

etwa 4 Jahre vor | 0

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Beantwortet
How to solve a non-linear system of differential equations?
Hi Pacao, The missing step is a call to odeToVectorField before the call to matlabFunction. Check that first doc page and then ...

etwa 4 Jahre vor | 0

Beantwortet
Systems with two different execution rates
Hi Samy, Are you intending to have one model reference the other via a Model block? If so, and if you have at least R2022a, I ...

etwa 4 Jahre vor | 1

Beantwortet
Calling the vectorized Matlab fcn from within Simulink
Use a Matlab Function block in the Simulink model and call your function from inside that block. If your function is not amenabl...

etwa 4 Jahre vor | 0

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Beantwortet
Generating numbers following a lognormal distribution within a specific interval
Hi Behrooz, Shouldn't the relationship be the log of the mean of samples is equal to mu + sigma^2/2 ? In any case, why would t...

etwa 4 Jahre vor | 0

Beantwortet
Inconsistency of the figure and value on the curve
Hi @M The equation for Dcdenominator is not properly vectorized. In one spot it uses /, which should be ./ % was % Dcdenom...

etwa 4 Jahre vor | 0

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Beantwortet
Problem using symbolic sinc?
We can get rid of the vertical asymptote with: syms x y w F A = 1; tau = 1; F = A*tau*sinc(w/(2*pi)*tau); figure fplot(abs...

etwa 4 Jahre vor | 0

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Beantwortet
Mixture of 2 salts + Dirac
Hi Adrielli, Why is Ain defined and then redefined? Is that correct? What is the role of the x and y variables in this problem...

etwa 4 Jahre vor | 1

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Beantwortet
How to create a transfer function with no simplification ?
I'm almost certain that this can't be done in the CST. If just wanted for display purposes you'd have to write your own code, bu...

etwa 4 Jahre vor | 1

Beantwortet
Discrete input signal and continuous transfer function
Not sure what the issue was with lsim without seeing the code. Is the transfer function contiuous time, e.g. a model of an anal...

etwa 4 Jahre vor | 0

Beantwortet
how to replace a symbolic variable with a real one after computation?
Use subs or symfun objects and covert to double are two options syms I3 I4 d = I3 + I4; double(subs(d,[I3 I4],[1.1 2.2])) d(...

etwa 4 Jahre vor | 0

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Beantwortet
sinc function doesnt work...
The code runs fine here. clear all close all clc T=0.1; A=1; tau=T/2; kmax=20; t0=tau/2; %% f0=1/T; t=(0:0.0001:1)*5*...

etwa 4 Jahre vor | 0

Beantwortet
Find source of stopped simulation in Simulink
Hi Stefan, If you use the sim command, then the output has some useful information. For example, I used a model with a Clock, f...

etwa 4 Jahre vor | 0

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