Error taking inverse of a matrix

Hi,

I am receiving the error, "Subscript indices must either be real positive integers or logicals", when I attempt to take the inverse of a matrix. Can somebody please help me? Here is my code:

C = xlsread('OP_data.xlsx'); D = C;
y = log(C(:,3));
D(any(C==0,2),:)=[]; y(any(C==0,2),:)=[];
X = [ones(size(D,1),1),log(D(:,5)),log(D(:,6))];
Beta = inv(X'*X)*(X'*y);

Any help would be greatly appreciated!

[Roger Stafford]

Somewhere in your system there may be a variable with the name 'inv', which causes matlab to misinterpret your line "Beta = inv(X'*X)*(X'*y);". Try doing a

   whos

to see if 'inv' shows up.