Paul

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Answered
IFFT results in wrong frequency
The inverse Discrete Fourier Transform, as implemented by ifft, maps a signal from discrete frequency to discrete time. Each ele...

12 hours ago | 0

Answered
How can I use the function coeffs() as the input to the function tf()?
Unless there are reasons to use syms other then to compute the polynomials, it's probably better and easier to avoid syms altoge...

1 day ago | 0

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Array of transfer function (nxn) when multplied with an array of constant nx1 give issue
Example matrices rng(100); A = rand(3); M = rand(3,1); s = tf('s'); T = inv(s*eye(3)-A) H = T*M Your are correct that each...

3 days ago | 1

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Question

Should mldivide Return a Solution for Square, Rank-Deficient, but Consistent Set of Linear Equations?
load lindata A and b define a linear system of equations Ax = b. A is 12 x 12 with rank rank(A) But the linear equations are...

4 days ago | 2 answers | 0

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answers

Answered
Solve equilibrium equations in MATLAB for a quadruped robot
Problem parameters W = [1; 1; 10]; x1=50;y1=31.65;z1=16.09; x2=sym(44.68);y2=sym(-27.26);z2=sym(-24.34); x3=-4.72;y3=-24.4;z...

4 days ago | 0

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How can I make the Nichols chart background grid more prominent when using Nicholsplot? (Too faint.)
You can change the linewidth of the grid lines plotoptions = nicholsoptions; plotoptions.GridColor = [0.0 0.0 0.0]; plotoptio...

7 days ago | 0

Question

Why Must the TimeZone be Specified for datetime when the Time Zone is Included in the DateString?
Suppose I have a date string fu = "Mon Mar 3 12:20:40 EST 2025" Converting to datetime causes an error because the TimeZone in...

8 days ago | 1 answer | 0

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answer

Answered
How to create a table with data from multiple tables using function or for loop
Hi Kristine, It will be easier to process if the date for each table is actually stored in the data structure itself, rather th...

9 days ago | 0

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Deconvolution creates new peaks
Hi Riccardo, It might be simpler to just use the twosided option of tfestimate Also, the input data is single, might want to c...

9 days ago | 2

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Answered
Issue with Time-Domain Shifting Using Fourier Shift Property in MATLAB
Hi Jason, I think the fundamental issue is that one shouldn't expect that Result = 0. Suppose we have a continuous time signal...

10 days ago | 0

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Model variable/jittered clock to sample a signal in Simulink - how does variable sample times work?
Because the Hit Scheduler can accept vector inputs, I suppose the simplest approach would be to create the jittered sample times...

16 days ago | 0

Answered
I am working on an assignment for class I can't figure out how to round the values in the table to two decimal places. Can anyone point out what I am missing?
It appears that formating numerics in a table is not same as the format used for display in the command window. Do you have to ...

25 days ago | 0

Question

How Can a sym Vector have Elements that are Vectors Themselves?
I ran the following code on 2024a syms x c1 c2 real m1c(x) = c2 + c1*x + heaviside(x - 4)*(3*x - 2)*(x - 4); This line causes...

25 days ago | 1 answer | 0

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Question

Simplify() Does Not Work with "All" Argument?
This is a bug? syms x c1 c2 real m1c(x) = heaviside(x-4)*(3*x-2)*(x-4) + c1*x + c2; simplify(diff(m1c(x),x),'All',true)

26 days ago | 0 answers | 0

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Answered
Matrix multiplication between an operation matrix, such as the rotation matrix, and a coordinate list.
y_rotation_matrix=@(theta) [cos(-theta) 0 sin(-theta);0 1 0;-sin(-theta) 0 cos(-theta)]; rng(100) coordinate_list=rand(10,3);...

27 days ago | 0

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Answered
Errors in the symbolic integration of the Dirac Delta function (bug?)
Hi Geoffrey, Not sure why there seems to be a problem with the antiderivative v1. You should consider reporting it as bug. I've...

28 days ago | 0

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Answered
Is it possible to 'interpolate' in FFT data?
Hi xd. Here is one way to think about this problem. Let c[n] = A*cos(w_0*n + phi) be the reference signal where -pi <= w_0 <= ...

1 month ago | 1

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Answered
Run an enabled and triggered subsystem only one time (single shot)
Does it really need be enabeld and triggered? Even if so, it should only run when triggered (and enabled), so if the trigger tr...

1 month ago | 0

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Answered
Designing an Output Zeroing Input for an LTI Discrete-Time System in MATLAB
Hi shokouhfeh, I did not go through all of the math. But I do see that the input is of the form u[k] = (-1.1)^k That magnitud...

1 month ago | 0

Answered
vpa, simplify, solve, etc don't fully simplify symbolic function.
l = 50; a = 10; W = 1200; syms Q(z); Q(z) = 1200 + 56*z - 2.5*z^2; R = - int(Q(z), [0 l]) + W; syms F1(z) F2(z) F3(z); F1...

1 month ago | 0

Answered
what is this block called
That is a Memory block.

1 month ago | 1

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Answered
Transfer function model from block diagram
The easiest way, IMO, is to use connect. Feel free to post back here if you still have questions after reading the doc page and ...

1 month ago | 0

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Answered
Help with MATLAB symbolic toolbox
Hi Scott, See below for solution % Set up symbolic variables syms t C1 C2 % Set up parameters K = 2.2167e+06; M = 45.96; ...

2 months ago | 0

Answered
fftshift implementation in Simulink
fftshift is extended to code generation. Assuming the data output from the FFT block is in linear order, you can call fftshift f...

2 months ago | 0

Answered
ECEF 6DOF block - position calculation
Hi Thomas, As far as I can tell, the translational equations in the Algorithms section of the documentation page 6DOF ECEF (Qua...

2 months ago | 0

Answered
Data extraction/split from table
Hi Daher, Start with findgroups identify the unique rows in the table and map each row to a unique row. T = readtable('art_fil...

2 months ago | 2

Answered
Does enu2ecefv make any assumptions about the ellipsoid?
Hi Eitan, See Vectors in 3-D Coordinate Systems for a brief explanation.

2 months ago | 0

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Answered
How to calculate only several frequency with FFT ?
If the desired frequenices are a subset of those that correspond to the DFT as computed by fft, I'd imagine in many cases there ...

2 months ago | 1

Answered
how to search parameter with specific name under the simulink system
Check out Simulink.findVars

2 months ago | 0

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Answered
possibility to create "Enbaled" subsystem
One option would be to create the subsystem as an Enabled subsystem and then control the enable port with a signal that you cont...

2 months ago | 0