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# Birdman

##### Last seen: 1 jour 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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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...

19 jours ago | 0

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))

19 jours 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...

19 jours ago | 0 answers | 0

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

28 jours ago | 0

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

environ 2 mois ago | 0

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...

environ 2 mois ago | 0

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

environ 2 mois ago | 0

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.

environ 2 mois ago | 0

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

environ 2 mois ago | 0

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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(...

environ 2 mois ago | 0

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...

environ 2 mois ago | 0

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...

environ 2 mois ago | 0

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; ...

environ 2 mois ago | 0

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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(...

environ 2 mois ago | 0

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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...

environ 2 mois ago | 1

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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.

environ 2 mois ago | 0

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))

environ 2 mois ago | 0

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); ...

environ 2 mois ago | 0

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

environ 2 mois ago | 0

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

environ 2 mois ago | 1

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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 ...

environ 2 mois 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 ...

environ 2 mois ago

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...

environ 2 mois ago | 0

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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...

environ 2 mois ago | 0

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)

environ 2 mois ago | 0

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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...

environ 2 mois ago | 0

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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...

environ 2 mois ago | 0

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...

environ 2 mois ago | 0

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