Why do I get an error'Undefined function or variable 'i'' do we need to define i.

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...
if(from<to)
    for i=from:1:to
        if(i==2)
            %translating and shifting basis:
            tempvector=shiftbasis(1,2,yaw,tilt,wing,cone)*(tempvector-tower);
        end
        if(i==3)
            %translating and shifting basis:
            tempvector=shiftbasis(2,3,yaw,tilt,wing,cone)*(tempvector-nacelle);
        end
        if (i==4)
            %shifting basis:
            tempvector=shiftbasis(3,4,yaw,tilt,wing,cone)*tempvector;
        end
    end
else
%If the transformation is from a high index to a lower:
if(from>to)
    fori=from-1:-1:to
        if(i==1)
         %shifting basis and translating:
          tempvector=(shiftbasis(2,1,yaw,tilt,wing,cone)*tempvector)+tower;
    end
  ...