Undefined function or variable 'p1x'.

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.

Answer 1

[Walter Roberson]

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]

you're right. My bad :-(