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# Birdman

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1,205 2017 이후 총 참여 횟수

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...

16일 전 | 0

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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))

16일 전 | 0

질문

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...

17일 전 | 답변 수: 0 | 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)

26일 전 | 0

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

약 2달 전 | 0

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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...

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

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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.

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

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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(...

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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...

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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...

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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; ...

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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(...

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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...

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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.

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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))

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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); ...

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

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

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해결됨

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 ...

약 2달 전

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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 ...

약 2달 전

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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...

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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...

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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)

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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...

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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...

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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...

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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-...

약 2달 전 | 1

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

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