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## problem using quad function

**From**: |
trinka |

**Subject**: |
problem using quad function |

**Date**: |
Fri, 10 Jun 2011 14:53:33 -0700 (PDT) |

Hello,
I am an unexpert Octave user, so sorry if my post may look naive.
I am trying to integrate a quite complex function but I will give you a
simplified example:
http://octave.1599824.n4.nabble.com/file/n3589475/formula.png
Where H is the Heaviside step function.
I have prepared this script:
….
function y = heaviside (x)
y =ceil(sign(x)/2);
endfunction
L=2;
V(1)=10;
V(2)=20;
….
qtot=0.
for j=1:nlayer,
function y = fun (x)
y =heaviside(x-V(j));
endfunction
q=quad("fun",0,L)
qtot=q+qtot;
end
but I get the following error message “’V’ undefined near line 20’.
Do you have any hint?
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**problem using quad function**,
*trinka* **<=**