MATLAB: Integration using quad(@thefun,a,b)

integrationquad

I have the following function
    function AW1= AW_int()
    ASqr=aSqrSum();
    BSqr=bSqrSum();
    C=CSum();
    delta2=(ASqr.*BSqr)-(C.^2);
    delta=delta2.^(1/2);
    AW1=delta./ASqr;
    format long e
    delta2;
    delta;
    %delta2; delta; 
    AW1;
    end
Using the following functions for ASqr, BSqr and C
    function ASqr =aSqrSum(x,N)
N=[1000 10000 100000];
x=[0.9 0.99 0.999 0.9999];
ASqr = zeros(length(N), length(x));
for ii = 1:length(N)
    for n = 0:N(ii)-1
       ASqr(ii,:) = ASqr(ii,:) + (x.^(2*n));
    end
end
    function C = CSum(x,N)
N=[1000 10000 100000];
x=[0.9 0.99 0.999 0.9999];
C = zeros(length(N), length(x));
for ii = 1:length(N)
    for n = 0:N(ii)-1
       C(ii,:) = C(ii,:) + (n.*x.^(2.*(n)-1)) ;
    end
end
format long e
C;
end
format long e
ASqr;
end
    function BSqr =bSqrSum(x,N)
N=[1000 10000 100000];
x=[0.9 0.99 0.999 0.9999];
BSqr = zeros(length(N), length(x));
for ii = 1:length(N)
    for n = 0:N(ii)-1
       BSqr(ii,:) = BSqr(ii,:) + ((n.^2).*x.^(2.*(n)-2));
    end
end
format long e
BSqr;
end
When i try to integrate the function AW_int using
    Q = quad(@AW_int,0,0.9999)
The following error is returned:
    Error using AW_int
Too many input arguments.
   Error in quad (line 72)
y = f(x, varargin{:});
Would anyone be able to help me fix this? As I have tried a few different things but the same error is still be returned.
Thanks

Best Answer

Your AW_int function doesn’t take any input arguments:
function AW1= AW_int()
Also, you are not passing any arguments to these functions within AW_int, so they will likely throw a similar error when AW_int executes:
    ASqr=aSqrSum();
    BSqr=bSqrSum();
    C=CSum();
They all require x and N as inputs, so pass those to AW_int and then to the other functions.
Related Question