Question

I have an array of size 9 b and i am attempting at assigning values into it.

r=a(7)+u*(b(8))+v*(b(9))
b(7)=r

I get that r is indeed a 1X1 value but yet for b(7)=r i still get:

Error in ==> myFunction at 37
    b(7)=r

In an assignment  A(I) = B, the number of elements in B and
I must be the same.

The following is the code of myFunction (the for loop with % is what i would have liked to work)

function b=myFunction(u,v,a)
    b(8)=0;
    b(9)=0
    r=a(7)+u*(b(8))+v*(b(9));
    size(a)
    size(b)
    size(r)
    b(7)=r
    r=a(6)+u*b(6+1)+v*b(6+2);
    b(6)=r;
    b(5)=a(5)+u*b(5+1)+v*b(5+2);
    b(4)=a(4)+u*b(4+1)+v*b(4+2);
    b(3)=a(3)+u*b(3+1)+v*b(3+2);
    b(2)=a(2)+u*b(2+1)+v*b(2+2);
    b(1)=a(1)+u*b(1+1)+v*b(1+2);
    %for i=7:-1:1
    %    b(i)=a(i)+u*b(i+1)+v*b(i+2);
    %end
end

Answer 1

I can not reproduce your problem. The code below works for me. Are you calling myFunction() with scalar u and v?

function myTestFunction()

a = 1:7;
u = 3;
v = 4;
b = myFunction(u,v,a)

end

function b=myFunction(u,v,a)
    b(8)=0;
    b(9)=0
%     r=a(7)+u*(b(8))+v*(b(9));
%     size(a)
%     size(b)
%     size(r)
%     b(7)=r
%     r=a(6)+u*b(6+1)+v*b(6+2);
%     b(6)=r;
%     b(5)=a(5)+u*b(5+1)+v*b(5+2);
%     b(4)=a(4)+u*b(4+1)+v*b(4+2);
%     b(3)=a(3)+u*b(3+1)+v*b(3+2);
%     b(2)=a(2)+u*b(2+1)+v*b(2+2);
%     b(1)=a(1)+u*b(1+1)+v*b(1+2);
    for i=7:-1:1
       b(i)=a(i)+u*b(i+1)+v*b(i+2);
    end
end

with the following output

b =

     0     0     0     0     0     0     0     0     0


b =

  Columns 1 through 8

       29128        7281        1821         454         114          27           7           0

  Column 9

           0