how to define an integral function

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Saeid
Saeid 2018-9-6
评论： Aishwarya Kasarla 2023-4-1
I want to define a function in the integral form
f(x)=integral(g(z), z=0, z=x)
as an example:
for which I wrote:
fun = @(z) z^2+3*z-1;
x=linspace(0,1,100);
y = integral(fun,0,@(x) x)
plot(x,y)
But Matlab returned the following error:
Error using integral (line 85)
A and B must be floating-point scalars.
Error in IntegralFunction (line 8)
y = integral(fun,0,@(x) x)
Is it possible at all to do this in Matlab?

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采纳的回答

Torsten
Torsten 2018-9-6
fun=@(z)z.^2+3*z-1;
F=@(x)integral(fun,0,x);
F(10)
  5 个评论
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Saeid
Saeid 2018-9-7
I tried the following format but it didn't work:
tspan = [0 5];
y0 = 0;
[t,y] = ode45(@(t,y) DYDT(t,y) , tspan, y0);
plot(t,y,'-o')
function dydt=DYDT(t,y)
fun=@(z)z.^2+3*z-1;
dydt=@(y)integral(fun,0,y)
end
Aishwarya Kasarla
Aishwarya Kasarla 2023-4-1
Hey, I am also stuck with the same proble, did you find the solution? Can you please help me out with this?

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