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Paul


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Answered
Using subs() in a function when symbolic variables defined in another function
Making F into a symfun seems to work .... F = getJacobian valueF = someRandomFunc(F) function myJacobian = getJacobian() ...

environ 23 heures ago | 1

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Answered
impulse response ode45 help
Hi 9times6, Numerical integration schemes like ode45 don't really work for Dirac delta functions. One option is to compute the...

1 jour ago | 0

Answered
Help Making a Piecewise Function Periodic
HI Connor, Something like this? syms t real z(t) = piecewise(0 <= t <= 1,t, 1 < t <= 2.5, exp(-5*(t-1)),0); fplot(z(t),[-2 1...

2 jours ago | 1

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Answered
Creating a series of random numbers, where the next series is changed by a factor with the previous
Hi Lily, The code starts by allocating a 5 x 25 matrix, x. That's good. But then x is never used after that. Assuming that x i...

2 jours ago | 0

Answered
how to change the rise time of step input in simulink
A 1D Lookup Table seems like a good option.

3 jours ago | 0

Answered
How to calculate and sketch the Fourier Transform of a gaussian function?
Hi Steven What doesn't seem correct? The only issue I see is the calculation of Fv, modified below. x_fit_func = @(x) (exp(-p...

4 jours ago | 0

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Answered
how to code transfer function
There seems to be two questions in this Question. The first question is: How to plot the transfer function. For values of tau0 ...

4 jours ago | 0

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Answered
I want to know what is this block
I think it's a Display block. Right-click on it. There should be something in that menu that either identifies it directly or ca...

4 jours ago | 0

Answered
Don´t know how to perform IFFT considering my frequency.
Hi Andriy I would attack the problem this way, assuming throughout the original time-domain signal is real and the freq vector ...

6 jours ago | 0

Answered
Change exp from number to e
Use sym arguments to exp, otherwise it reverts to the base Matlab numerical function. syms c1 c2 y(x) f(x) y(x) = (exp(sym(2))...

6 jours ago | 1

Answered
Table - conditional maths and plots from variables
Check out splitapply

7 jours ago | 1

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Answered
How to write a for loop to iterate through subjects IDs and their associated reaction times and create histogram
Hi Rania, Check out the splitapply function and workflow. Example with an array, but I think you can make it work with a table ...

7 jours ago | 0

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Answered
How to fix the large and mad fractions when dealing with symbolic vars
In this expression syms a a * cos(pi/2) the cos() is evaluated numerically and the result converted to a sym to multiply with...

7 jours ago | 0

Answered
block diagonal matrix in the opposite diagonal
Here's one option a = rand(2); b = rand(2,3); A = blkdiag(a,b) D = oppblkdiag(a,b) function D = oppblkdiag(varargin) c...

7 jours ago | 1

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Question


Can a Dictionary Key be a char?
Playing with the new dictionary in 2022b and discovered that a char can't be used as the key (can use a string though) string.e...

8 jours ago | 3 answers | 0

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answers

Answered
underwater acoustic wave Signal to Noise Ratio (SNR)
At a minimum: SSs is still using log, probably should be log10 The equation coded for ns doesn't match the equation in the que...

8 jours ago | 1

Answered
Character Frequency of String
Using the new dictionary in 2022b and the on-point example from this blog post str = "SunnyDay"; chr = char(str); d = diction...

8 jours ago | 0

Answered
How to change constant block automatically and run automatically
Is your question, "How do I run the simulation for multiple values of firing angle and save the results of each simulation?" If...

8 jours ago | 0

Answered
How to get the output of a controller from MATLAB codes not simulink
I suggest using interconnection functions to build a single system model that has the control input to the plant as one of the o...

9 jours ago | 0

Answered
Deriving the transfer function from a data set that has magnitude,phase and omega
Hi George, I plotted the data and it looks like the data comes from a transfer function where the degree of the denominator is ...

10 jours ago | 0

Answered
How to subtract ?
Can do this in a loop B = 12; A = [0 1 2 3 4 5 6]; C = 0*A; C(1) = B(1) - A(1); for ii = 2:numel(A) C(ii) = C(ii-1) - ...

10 jours ago | 1

Answered
How can I have for loop show me each histogram it created rather then play it like a movie?
What happens if you put the command hold on after the figure(3) line?

12 jours ago | 1

Answered
discrete TF ""the order of the denominator must be greater than or equal to the order of the numerator""
Hi mahmoud. Q(z) can't be implemented in Simulink. If the model has another element, call it P(z), in series with Q(z), then t...

13 jours ago | 0

Question


Where is the Documentation for Indexing on the Left Hand Side of an Assignment?
I recently ran into something like this: x = [1 2 3]; x([1 2 1]) = [10 20 30] So it looks like the second index of 1 on the L...

14 jours ago | 1 answer | 0

1

answer

Answered
How can my code, which collects bad data with 'cellfun' and 'try, catch', be improved?
Have func() return a logical with true indicating the file is bad and false indicating the file is good. In this case we'd have...

14 jours ago | 0

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Answered
How to ROUND the elements of cell array?
% example data rng(100) child.x ={rand(1,3)}; format long child.x round(child.x{1},3)

14 jours ago | 0

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Answered
Avoid slprj folder and slxc files
Possibly can be done via Simulink preferences. Try this doc page, particularly the section on "Folders for Generated Files."

14 jours ago | 0

Answered
Functions only plotting out to x=5
fplot doesn't take t as the first argument as would have to be done for plot. Actually, I guess it can, but it's superfluous. In...

14 jours ago | 0

Answered
Huge difference between the result of fft function Matlab and analytical Fourier transform of the same function
Can't say for sure w/o seeing the code, but I supsect the fftshifted curve will be close to the blue curve if you mulitply the f...

15 jours ago | 0

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Answered
How should I plot the function (sqrt(1 + x) - 1) / x using the values x = 0.1, 0.01, 0.001, ..., 10^-20?
Hi Jackson, If you want x to from -1 to -20 you have to put the stride of -1 in the colon operator, otherwise it uses the defau...

15 jours ago | 0

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