Hello ! I have a stupid question. When i run this function i see this error: "rototranslation" requires more input arguments to run. Why?

function [ F ] = rototranslation( x)
%UNTITLED3 Summary of this function goes here
%   Detailed explanation goes here
% x1=beta
% x2=gamma
% x3=x
% x4=y
% x5=z
% x6=alpha

global b1f b2f b3f
global b1 b2 b3

R= [sin(x(1))*cos(x(2))   cos(x(6))*sin(x(2))-sin(x(6))*cos(x(1))*cos(x(2))   sin(x(6))*sin(x(2))-cos(x(6))*cos(x(1))*cos(x(2));
    sin(x(1))*sin(x(2))  cos(x(6))*cos(x(2))-sin(x(2))*sin(x(6))*cos(x(1))  -sin(x(6))*cos(x(2))-cos(x(6))*cos(x(1))*sin(x(2));
    cos(x(1))   sin(x(6))*sin(x(1))   cos(x(6))*sin(x(1))]
p=[x(3); x(4); x(5)];
b1s=R*b1f+p;
b2s=R*b2f+p;
b3s=R*b3f+p;
b4s=R*b3f+p;

F(1)=b1s(1)-b1(1);
F(2)=b1s(2)-b1(2);
F(3)=b1s(3)-b1(3);
F(4)=b2s(1)-b2(1);
F(5)=b2s(2)-b2(2);
F(6)=b2s(3)-b2(3);
F(7)=b3s(1)-b3(1);
F(8)=b3s(2)-b3(2);
F(9)=b3s(3)-b3(3);
end

Answer 1

[Geoff Hayes]

Alessandro - how are you calling this function? If you don't supply any input parameters and so call the function (from the Command Window) like

 rototranslation

then you will observe the error

 Error using rototranslation (line 14)
 Not enough input arguments.

because I am not passing any input parameters.

Look at the function signature (the first line of the rototranslation.m)

 function [ F ] = rototranslation( x)

There is a single input parameter named x which you must pass into this function. Examining the code, this input should be an array of six elements. For example,

 x = randi(42,1,6);
 F = rototranslation(x);

(Naturally, the global variables will have to be well defined though you may want to revisit the use of these globals.)

Answer 2

[Star Strider]

You cannot run your function from the Command Line or a script just by typing its name. You have to provide an argument to it.

So to use it, you have to call it as:

x = [ ... SIX-ELEMENT VECTOR ... ];
F = rototranslation(x);

and if the function is written correctly, you will have your result in the ‘F’ variable.