Not enough input arguments error/ int command/ integral calculation
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Efrat Hazan Elimelech
on 15 Dec 2022
Commented: Efrat Hazan Elimelech
on 16 Dec 2022
Hi,
I'm trying to calculate very simple integral, and don't understand why I get this error..
Aside from practical help I'd like to understand why this error shows up.
The script is:
integral_1=int(int_1,x1,0,pi/2);
integral_2=int(int_2,x2,0,3);
function f1=int_1(x1)
f1=8+4.*cos(x1);
end
function f2=int_2(x2)
f2=1-exp(-x2);
end
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Accepted Answer
Bora Eryilmaz
on 15 Dec 2022
Edited: Bora Eryilmaz
on 15 Dec 2022
Use the integral command, not int. The integral command does numerical integration. The int command is for symbolic integration. Also use "@" in front of the function names to pass their function handles to the integral function.
integral_1=integral(@int_1,0,pi/2)
integral_2=integral(@int_2,0,3)
function f1 = int_1(x1)
f1 = 8+4.*cos(x1);
end
function f2 = int_2(x2)
f2 = 1-exp(-x2);
end
More Answers (1)
Cris LaPierre
on 15 Dec 2022
Edited: Cris LaPierre
on 15 Dec 2022
int is for symbolic integration. See Bora's answer if you want to perform numerical integration.
The error is because of how you have defined your integration functions. The integration function can't have inputs. It is probably easier if you define your functions as symbolic functions. You also need to declare your integrabtion variables as symbolic.
syms x1 x2
int_1(x1) = 8+4.*cos(x1);
int_2(x2) = 1-exp(-x2);
integral_1=int(int_1,x1,0,pi/2)
integral_2=int(int_2,x2,0,3)
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