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Question: Illegal use of a formal parameter

Question:Illegal use of a formal parameter

abbeykabir 85 Maple 18
July 16 2015
1

Please, I have an error message which says Error, (in eul) illegal use of a formal parameter. I can't find the cause of the error. I got the result I wanted if i remove these lines eul := proc(x,y) , return yt: , end proc: and

yv := eul(x,y); that is if I consider the for..loop alone.

fxy := proc(x,y)
  return x/y;
end proc:

a := 0:
b := 1:
N := 10:
h := evalf((b-a)/N):
x := 0:
y := -2:
yt := Vector(3):

eul := proc(x,y)
    for j from 1 to 3 do
          y[j]:= y + h*fxy(x,y):
          x:= 0 + j*h:
          y := y[j]:
          yt[j] := y:
    end do:
    return yt:
end proc:
yv := eul(x,y);

 
 
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