# Undefined function or variable 'p1x'.

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Daniel Wurster on 16 Jun 2019
Commented: Daniel Wurster on 16 Jun 2019
I know, another "undefined function or variable ...." question, but i read through the other answers and still dont know whats wrong here.
I took a self written c programm and tried to put it into matlab code:
function [ab, la] = linepoint (p1x, p1y, p2x, p2y, p3x, p3y)
%%
la = sqrt((p2x-p1x)^2 + (p2y-p1y)^2);
%%Intitialize
d1 = p2x - p1x;
d2 = p2y - p1y;
er = sqrt(d1*d1+d2*d2);
u = (((p3x - p1x) * (p2x - p1x)) + ((p3y - p1y) * (p2y - p1y)))/(er*er);
if lt(u,0)
false;
else
p4x = p1x + u*(p2x-p1x);
p4y = p1y + u*(p2y-p1y);
ab = sqrt((p4x-p3x)^2 + (p4y-p3y)^2);
end
Clicking on run i get: Undefined function or variable 'p1x'.
What have i done wrong here? I c-code p1x is an integer type and no error occures.

Walter Roberson on 16 Jun 2019
Your code requires six inputs. When you click on Run, you are providing zero inputs. Where are you expecting it to get the value of p1x from when you click on Run ?
Daniel Wurster on 16 Jun 2019