Using integral to define a function

So I'm trying to define a function which has an integral inside.
Below is a simplified version of the function with the same error message: Unrecognized function or variable 'E'.
What I don't get is since variable E goes away after integral, shouldn't there be no reason for me to define it?
Also, how could this problem be resolved?
Thanks in advance.
result(0)
function test_integral = result(V)
test_integral = integral( @temp, E, -1, 1);
function tempf = temp(E)
tempf = E.*V;
end
end

 采纳的回答

Remove the E from the integral() call, as it is not required.
Refer to the documentation of integral to know more about the syntax of the function.
result(2)
ans = -1.1102e-16
result(4)
ans = -2.2204e-16
result(6)
ans = -3.3307e-16
function test_integral = result(V)
test_integral = integral(@temp, -1, 1);
function tempf = temp(E)
tempf = E.*V;
end
end

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