parse error message. "Parse error at '<='. usage might be invalid syntax"

This code:

i=0;

for i <= 3

[X,Y,t] = meshgrid(0:2,0:2,0:i);

U = X;

V = t.^2;

quiver(X,Y,U,V);

i+1;

end

gives the error message: "Parse error at '<='. usage might be invalid syntax". I don't know why this would be invalid syntax.

Answer 1

[Fangjun Jiang]

Looks like it needs to be "while i<=3"