MATLAB: Collinearity code not working

collinearityhomework

Question: mylinecheck(a,b,c,d,e,f) which takes six inputs: [30 pts] a,b,c,d,e,f: Real numbers. You may assume that a,c,e are all nonequal. Does: Checks if the three points (a, b), (c, d) and (e, f) all lie on the same line. How you do this is up to you but I suggest trying to find a really quick way. Quick ways exist! You’ll almost certainly need an if statement. Returns: 1 if they do and 0 if they don’t
Code:
if true
  % code
end
function mylinecheck(a,b,c,d,e,f)
p1 (a,b);
p2 (c,d);
p3 (e,f);
end
function tf = collinear2(p1,p2,p3)
m = slope(p1,p2);
b = intercept(p1,p2);
if ~isfinite(m)
if (p3(1)==p1(1))
tf = true;
else
tf = false;
end
else
tf = (m*p3(1)+b) == p3(2);
end
end
function m = slope(p1,p2)
m = (p2(2)-p1(2))/(p2(1)-p1(1));
end
function b = intercept(p1,p2)
m = slope(p1,p2);
b = -p1(2)+m*p1(1);
end
Test file:
format long;
a=mylinecheck(0,0,2,2,5,5)
Error: Error using mylinecheck Too many output arguments.
Error in Test (line 2) a=mylinecheck(0,0,2,2,5,5)

Best Answer

See if changing the first line of your function to:
function g = mylinecheck(a,b,c,d,e,f)
and then assign ‘g’ (or whatever variable you want it to return) somewhere in your code as well. (The output argument and the variable you want the function to return must have the same name.) It is not obvious what you want your function to return, but it should also not be the same name as one of your input arguments (for example, (a,b,c,d,e,f)). That causes confusion at the very least, and could throw an error.
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