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Birdman


Last seen: 3 days ago
1,205 total contributions since 2017

Someone who is interested in Mathematics, Control and Engineering. Also, music as a hobby.

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Answered
Derivate a function with two variable dependent of time
The following might help: syms r(t) theta(t) f(r,theta) f=r^2+0.2*cos(theta)-0.03 To take partial derivative, use functionalD...

25 days ago | 0

Answered
define tau in transfer function
The following might help: syms s t tau Cs=(1/s)*(1/(tau*s+1)); c(t,tau)=ilaplace(Cs) T=0:0.01:1; plot(T,c(T,0.1))

25 days ago | 0

Question


Capabilities of Building Standalone Simulation Applications in App Designer with Simulink Compiler
Hello everyone, For those who do not know, MATLAB released Simulink Compiler with 20a release which helps to build and deploy s...

26 days ago | 0 answers | 0

0

answers

Answered
How is derivative made in Matlab ?
syms v(t) v(t)=t.^3-6t.^2+7; a(t)=diff(v); result=a(3.5)

1 month ago | 0

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Answered
Replacing characters in a string
One example(use regexprep): s="Yao Ming"; regexprep(s,{'Y','M'},{'J','Q'})

2 months ago | 0

Answered
How to update a variable in a function after every 5 seconds?
Run the attached model and see the results. You can change the Ramp block's Slope value and store different numbers. Output of t...

2 months ago | 0

Answered
Function like "find" but for lines
B=reshape(A.',1,[]); C=(1:numel(A)).*(B~=0); C=C(C~=0)

2 months ago | 0

Answered
Matrix with numeric values
N=4 A=1:N; B=char(64+A) 'ABCD' B(1) 'A' B(2) 'B' . . and so on. Change N and observe the results.

2 months ago | 0

| accepted

Answered
Solving non linear 2nd order differential equation
Try this: clear syms t Y0= input('wave amplitude ') ; %Wave ampli...

2 months ago | 0

| accepted

Answered
y[n] = x[n] - x[n-1] x[n-2] I need to find a) Find the transfer function. b) Give the impulse response. d) Sketch the frequency respo
Try this: z=tf('z',0.001); Gz=1-z^-1+z^-2; %%transfer function Gs=d2c(Gz,'tustin') %%impulse response figure(1); impulse(...

2 months ago | 0

Answered
How can I remove identical cell entries containing small arrays
The following code should simply do the job for you: unique(cell2mat(connect_group),'rows') After this, you can regroup the ar...

2 months ago | 0

Answered
Simulink-Sawtooth Decrease Counter
Try the attached model. Note that I didn't use Pulse Generator or Detect Decrease or Sum or Memory block. The model is very simp...

2 months ago | 0

Answered
how can I do this in mat lab
syms u(t) x(t) h(t) u(t)=piecewise(t>=0,1,0); x(t)=cos(pi*t)*(u(t)-u(t-1)); h(t)=1.5*(u(t)-u(t-1.5)); %%plot t=0:0.001:5; ...

2 months ago | 0

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Answered
Plotting the derivative of an "switch-funktion"
You may use Symbolic Toolbox and its beauties for this case :) Here is the code: syms y1(t) y2(t) y3(t) y4(t) y1(t)=piecewise(...

2 months ago | 0

| accepted

Answered
How can i fix the error 'Index exceeds the number of array elements (51)'
You need to apply elementwise division: x = [0:0.1:5]; y = sin(x)./x; plot(x, y), xlabel('xi'), ylabel('Theta'), title('Solut...

2 months ago | 1

| accepted

Answered
How can I determine which values in vector X are NOT in vector Y?
Z=~ismember(x,y) It will return 0 0 0 which means every element in vector X are also in vector Y.

2 months ago | 0

Answered
plot signal of time domain
syms x(t) x(t)=sin(2*pi*0.1*t); t=0:0.001:10; plot(t,x(-2*t+3))

2 months ago | 0

Answered
how do i plot step response of a system using fourier transform?
If you are dealing with s domain, you need to use ilaplace. Try this: syms t; G = tf([1], [1 0.9 5]); [num,den] = tfdata(G); ...

2 months ago | 0

Answered
Matrix Loop Code Question
P_resultant=cumsum([400 -Loss]); P_resultant(1)=[]

2 months ago | 0

Answered
Covert cell array to array
Something like this? Array=cell2mat(CellArrar.')

2 months ago | 1

| accepted

Solved


Doubling elements in a vector
Given the vector A, return B in which all numbers in A are doubling. So for: A = [ 1 5 8 ] then B = [ 1 1 5 ...

2 months ago

Solved


Remove all the words that end with "ain"
Given the string s1, return the string s2 with the target characters removed. For example, given s1 = 'the main event' your ...

2 months ago

Answered
Plotting the solution to a system of second order differential equations
Is there a way I can generate a single plot instead of four plots, for example, the plot of θ(t) vs x(t)? Yes you can, with th...

2 months ago | 0

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Answered
Change detection using simulink
I tried to make a model for you, where I tried to build a signal based on your description. Please click on the Signal Builder b...

2 months ago | 0

Answered
Typing a long and complicated equation
syms y(t) eq=2*pi*(sqrt((y-44.56)/(-0.16))+1)*sqrt(1+((1)/(-0.32*((sqrt((y-44.56)/(-0.16))+1))+0.32))^2)

2 months ago | 0

| accepted

Answered
i have a problem with simulink when run simulation it's stop in 2%
Go to Configuration Parameters->Solver section and choose Fixed Step solver and its type as ode5. Then, set the sample time as 0...

2 months ago | 0

| accepted

Answered
Maximum and Minimum values of a field structure array
%find max and min population [Cmax,maxIdx]=max(AustralianStates.Population) [Cmin,minIdx]=min(AustralianStates.Population) %f...

2 months ago | 0

Answered
How to exclude certain rows and columns based on a column value?
Firstly, at your first line of code, you started checking from the beginning of a. Instead, you should be checking the 23rd colu...

2 months ago | 0

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Answered
Changing the values of an array with an if condition inside a for-loop
Maybe the following code will get you going: x = 10; y = 10; xo = [20 30 35 50 65]; yo = [13 25 35 38 45]; rho_r = sqrt((x-...

2 months ago | 1

Answered
Calling a derived value as legends in plot
After the loop, run the following line: legend(reshape(sprintf('%d',Zeta),numel(Zeta),1))

2 months ago | 0

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