# Paul

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**Content Feed**

Linear equations with three unknowns

Hi Ahmed, The problem in the Question is ill-defined becasue there are no values of (x,y,z) that satisfy all four equations. ...

1 día ago | 0

what is this simulink's block?

Double click on the block. The very top of the dialog window that opens should say "Block Parameters: BlockType" where BlockTyp...

1 día ago | 0

Problem in creating stimulink for a tranfer function

Can't be done. If the block in question is followed (or preceded) by another block of an LTI system, then you can combine them ...

1 día ago | 0

Creating a log probability plot for particle size distribution

Using same example data as above ... x1 = wblrnd(3,3,[500,1]); figure probplot('weibull',x1) grid set(gca,'XDir','reverse')...

2 días ago | 0

How to plot the convolution integral of two functions

Hi Anthony, When using conv to compute a convolution sum to approximate a convolution integral of two signals (not two integral...

2 días ago | 1

| accepted

Problem seen in discrete transfer function with varable z^-1, when calc ztrans of x(n)=n*u(n)

Code works exactly as advertised u = @(n) heaviside(n) ; % change function name syms n x(n)=n*u(n) X1=ztrans(x) [num, den...

6 días ago | 2

| accepted

convolution of signals using matlab

Hi Jiby, With respect to part b), you may want to consider: b) In linear systems analysis, we often use convolution to apply a...

8 días ago | 0

How to randomize simulation seed in simulink?

Hi Amr, When I first saw the question, I was quite surprised. To my uderstanding, the call to pearsrnd in the Matlab Function b...

9 días ago | 2

Convolution of a gaussian and an exponential

Are all of the parameters in the problem real? If so, then asserting them as such yields a simpler result. syms I0 E E0 s N0 a...

9 días ago | 0

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() ...

11 días ago | 1

| accepted

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...

12 días ago | 0

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...

12 días ago | 1

| accepted

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...

12 días ago | 0

how to change the rise time of step input in simulink

A 1D Lookup Table seems like a good option.

14 días ago | 0

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...

14 días ago | 0

| accepted

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 ...

14 días ago | 0

| accepted

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...

14 días ago | 1

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 ...

16 días ago | 0

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))...

17 días ago | 1

Table - conditional maths and plots from variables

Check out splitapply

17 días ago | 1

| accepted

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 ...

17 días ago | 0

| accepted

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...

17 días ago | 0

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...

17 días ago | 1

| accepted

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...

18 días ago | 3 answers | 0

### 3

answersunderwater 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...

19 días ago | 1

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...

19 días ago | 0

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...

19 días ago | 0

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...

19 días ago | 0

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 ...

20 días ago | 0

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) - ...

20 días ago | 1