I want to integrate a function
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i want to integrate this function used quad function but giving error
kindly resolve
2 Comments
Walter Roberson
on 28 Dec 2021
Your code is
function Ix = f(x)
global Lz cr2 n1 n2
%wq = x.*x *cr2/(2 * Lz*Lz);
wq = x;
f5 = fbjnn(x,n1,n2);
Ix = (x.^3).*f5;
end
We do not have values for those global variables, and we do not have your fbjnn function, so we are not able to test the code.
What error message is given?
Answers (5)
reshma nesargi
on 28 Dec 2021
1 Comment
Torsten
on 28 Dec 2021
Edited: Torsten
on 28 Dec 2021
z and k are incompatible in size.
That's why I asked whether fbjnn can deal with vector input. This shows: it can't.
Use "integral" instead of "quad" and call it with the option 'ArrayValued',true :
Ix = quad('f',0,100); -> Ix = integral(@f,0,100,'ArrayValued',true);
Iz = quad('fun',0,100); -> Iz = integral(@fun,0,100,'ArrayValued',true);
reshma nesargi
on 28 Dec 2021
1 Comment
Walter Roberson
on 29 Dec 2021
'ArrayValued',true is a "name/value pair" that should be written exactly as Torsten showed.
Walter Roberson
on 29 Dec 2021
global Lz cr2 n1 n2
Uh-oh... caution time.
Lz = 1*10^-06;
cr2 = (hc * c)/(ec * b);
Okay, the globals Lz and cr2 are defined.
for i = 0:1:20
t(i+1)=i;
bkt=kB*t(i+1);
Ix = integral(@f, 0, 100, 'arrayvalued', true)
Okay, what does f do?
function Ix = f(x)
global Lz cr2 n1 n2
%wq = x.*x *cr2/(2 * Lz*Lz);
wq = x;
f5 = fbjnn(x,n1,n2);
Ix = (x.^3).*f5;
end
... f uses the global variables n1 and n2 that are not defined.
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