matlab piece wise function
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write a matlab code that plots the following piece wise function f(t) = ( 3t^2 +5 t>0)and f(t)=(-e^t + 5t <0 )
4 个评论
Rik
2019-6-3
Seems like a clear description of your homework. What is your question?
madhan ravi
2019-6-3
What have you tried so far?
JONATHAN KATHUZA
2019-6-3
编辑：Rik
2019-6-3
darova
2019-6-3
Is there something we can help you? What is the question?
回答（1 个）
Rik
2019-6-3
That is a good idea of solving your problem. There is one thing you're forgetting in your logic: to trim the parts you don't need in the third case. The solution to that is logical indexing, which is a good idea in the first place.
There is some code missing (because I'm not making your homework for you), but these parts should get you where you need to be.
a=-3;b=4;
if a>=b
error('invalid inputs')
end
t=a:0.01:b;
L=___
y=zeros(size(t));
y(~L)= -exp(t(~L))+5;
y(L)=3*(t(L).^2)+5;
But there is an even better solution: you can put your piecewise function in a single anonymous function and let fplot handle your problems. I'm using different conditions and functions as an example here, but you shouldn't have any trouble adapting it to your own problem.
f1=@(t)-exp(t);%function 1
f2=@(t) cos(t*5);%function 2
cond=@(t) sin(t*15)>0;%when this condition is true, set f2 to 0
f=@(t) f1(t).*cond(t) + f2(t).*~cond(t);
fplot(f,[a b])
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2019-6-3
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