Numeircal integral with external function and external parameter
6 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I would like to calculate an integral whereas the integrand is a separate external function. Consider as an example that I have in my main script:
N=5;
I = integral(fn,0,Inf,'RelTol',1e-8,'AbsTol',1e-13)
Where N is a parameter of the integrand that appears in the separate function named: fn.m that has the following form:
function FUN= fn(x)
FUN=@(x) (x.^N).*exp(-x).*sin(x)
end
But when I do this I see the following error:
Undefined function or variable 'N'.
How can I help Matlab take this external parameter into the integrand function?
0 commentaires
Réponse acceptée
madhan ravi
le 12 Jan 2019
Modifié(e) : madhan ravi
le 12 Jan 2019
EDITED
N = 5;
F = fn(x,N); % function call
I = integral(F,0,Inf,'RelTol',1e-8,'AbsTol',1e-13)
function FUN = fn(x,N) % function definition
FUN = @(x) (x.^N).*exp(-x).*sin(x);
end
Gives:
I =
-15.0000
7 commentaires
Walter Roberson
le 13 Jan 2019
function f3=FF3(x)
f3(1)=integral(fint1(x(1),x(2)),0,1)-2.333
f3(2)=integral(fint2(x(1),x(2)),0,pi)
end
function FUN1= fint1(x1,x2)
FUN1=@(y) x1*y.^2+x2
end
function FUN2= fint2(x1,x2)
FUN2=@(y) x1*sin(x2*y)
end
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Numerical Integration and Differentiation dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!