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# Birdman

1,099 total contributions since 2017

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

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Question

TMS320F28379D: Code Generation Error while Using CLA Task Trigger block in Simulink
Hello, I am using Launchpad F28379D in Simulink. I have a problem while generating code for a CLA Task triggered subsystem whic...

1 month ago | 0 answers | 0

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Numerical Integration from -Inf to Inf
Try the symbolic approach and consider the problem as follows: syms x F(x)=x*(x+0.1)^2*exp(2*(x+0.1)^2*3^2)*exp(-x^2); After ...

2 months ago | 0

Helping solving two variables in an equation
Try the following: Kt=[12 -1; -1 3]; I=[1 0;0 1]; lambda1=2.8902; w1=1.7001; V1=sym('V1',[2 1]); eqn=((Kt-lambda1*I)*V1)==...

2 months ago | 1

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Error when compiling with CLA on TI C2000 MCU in Simulink. Can't find "cla_header.h"
How did you solve this problem?

2 months ago | 0

Looping a matrix to find determinant
Following way can be a starting point: A=randi([1 5],8267,4);%%random data for i=1:max(size(A))-3 DetVal(i)=det(A(i:i+3,1...

10 months ago | 0

How to extract two equal maximum values at different index
index=find(A==max(A)) This should give you the indexes.

10 months ago | 0

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Question

Strange behavior of diff function with symbolic variables
Hello everyone, There is a strange behavior that I encountered while using diff function with symbolic variables, not functions...

11 months ago | 1 answer | 0

### 1

Assign different value of step response to a transfer function at different time intervals
You can do it with a Signal Builder. I attached the Simulink model. Take a look.

12 months ago | 0

how to plot constant gain with bode
To plot Bode of constant, define it as a transfer function but in the following way: Gs=tf(R1/(R1+R2),1); bode(Gs);

12 months ago | 0

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How to write time dependent exponential with simple Simulink blocks
Try this attached model.

12 months ago | 0

"solve " function returns inaccurate solutions
Try this: syms x assume(x,'real'); solx=vpasolve(x-sqrt(x+1)-sqrt(x-1)==0,x) or syms x assume(x,'real'); solx=vpa(solve(x...

12 months ago | 0

matching from multiple arrays
One way: Result=double(ref & (ref==a{1} | ref==a{2} | ref==a{3}))

12 months ago | 0

Just wondering how to I plot these functions into Matlab?
Try this: syms x(t) h(t) x(t)=piecewise(t>=-1 & t<=1,1,t<-1 | t>1,0) h(t)=rectangularPulse((t-1)/4) t=-5:0.01:5; ...

1 year ago | 0

How to construct a vector from specific elements in a matrix
B=[A(1,2);A(2,3);A(3,1)]

1 year ago | 1

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differentiation for a function
syms y(x) diff(diff(y,x)==x-y^2)

1 year ago | 0

How to delay a boolean signal by an amount of time?
Simply, use a *Delay* block. See the attached pictures for details.

1 year ago | 0

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I can I do logical indexing on a column
Is it possible for a value to be smaller than -8 and greater than 8 at the same time? Check your logical operator. You need _OR_...

1 year ago | 0

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Simulink write to array index
Of course it can be done. Check the attached files.

1 year ago | 1

NEED HELP IN MATLAB GUI FOR FOLLOWING CODE
Check the attached zip file. In screenshot, you will see how to enter x and y vectors and you will see that you obtain the resul...

1 year ago | 0

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Can I get the formula from the result value?
You may use *Curve Fitting Toolbox* for adapting formula(or function let's say) for your input and output values. There are seve...

1 year ago | 0

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I have a row vector consisting of 200 engine speeds. I want to feed one value at a time into an alternator block. How do I do it?
Use *From Workspace* block. Define your data at your workspace, and also define a time vector. These two vectors should be nx1, ...

1 year ago | 0

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Stuck with symbolic variables
You need to also convert your numerical array into *symbolic* so that things will be possible. For instance: c=sym(c) c(...

1 year ago | 0

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function [CM KG]=STtosi(In,Ib) It is not working
Since you did not mention why the function is not working, it may have two reasons: - Firstly, you need to save your function...

1 year ago | 0

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Why do I receive an error message about output arguments for my Embedded MATLAB Function in Simulink?
Simulink wants to know the initial value and size of your output at the very beginning of the simulation. Therefore, add D=0...

1 year ago | 0

Summing the diagonal of a matrix "the other way"?
This can be done as follows: res=[sum(diag(fliplr(A),3)) sum(diag(fliplr(A),2)) sum(diag(fliplr(A),1)) sum(diag(fliplr(A)))]...

1 year ago | 1

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Error states 'Subscript indices must either be real positive integers or logicals' when trying to complete this for loop?
You can not subscript *element zero* of an array. Change your for loop to for i = 1:numel(range) Ti_in(i) = Ti_in -((I...

1 year ago | 0

can anybody help me with the error?
Make sure that _TrainFeature_ (I assume it is a function) is located in your current working directory.

1 year ago | 0

How do I perform Partial differential equation by Simulink?
You can't. Only numerical derivatives with respect to time can be calculated in Simulink.

1 year ago | 0

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What does 'y:' stand for in plot command?
It means a _dotted yellow line_. For that, you may check the documentation of *plot* command. That third input argument decides ...

1 year ago | 0

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