how to integrate a graph

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MSP
MSP 2017-3-29
回答： KSSV 2017-3-30
A function is given for a definite interval. Infact exact problem coding is not required.The solution must be general.
  1. f(x)=x^2;0<x<5
  2. f(x)=x;5<x<8
Now how to integrate this and plot this I came up with
syms x
c=int(x^2)
then using heaviside function I could plot e.g c.*heaviside(t)-c.*heaviside(t-5);first part
But how do you convert the sym to matlab variable again
Help is higlhy appreciated

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采纳的回答

KSSV
KSSV 2017-3-30
syms x
f = x^2 ;
% integration
c = int(f) ;
% plot
xx = linspace(0,5) ;
plot(xx,double(subs(c,xx)))

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