Undefined function 'sind' for input arguments of type 'char'.

Guys I'm having a problem i don't know what is the cause. I was asked to determine what kind of triangle if its in 3d. The part in else always gives me error i dont know why can someone help This is my code

p=input('What is the point system of first point ','s')

if strcmpi(p,'RCS')== 1

    p1=input('coordinates ');

elseif strcmpi(p,'CCS')== 1

    p1=input('coordinates ');

    p1=([p1(1)*cosd(p1(2)), p1(1)*sind(p1(2)),p1(3)]);

else

    p1=('coordinates ');

    p1=([p1(1)*sind(p1(2))*cosd(p1(3)),p1(1)*sind(p1(2))*sind(p1(3)),p1(1)*cosd(p1(2))])
end

Answer 1

[David Goodmanson]

Christian, on the third line before the end you need p1 = input('coordinates')