Undefined function or Variable while calling function.

Program works fine by itself, but when I call it to another m file the error below occurs.

Command Window :

Undefined function or variable 'ang'.

Error in Degree_to_NorthAZM (line 26)
DTNA =[ang min sec];

Editor :

function [DTNA] = Degree_to_NorthAZM(angle, Direction)

% This function converts angle = [Degree Minute Second] into North AZM

% Direction 1, 2, 3 and 4 are respectively NW, NE, SE and SW

if Direction == 1

      ang = 359 - angle(1,1);
      min = 59 - angle(1,2);
      sec = 60 - angle(1,3);

elseif Direction == 2

      ang = angle(1,1);
      min = angle(1,2);
      sec = angle(1,3);

elseif Direction == 3

      ang = 179 - angle(1,1);
      min = 59 - angle(1,2);
      sec = 60 - angle(1,3);

elseif Direction == 4

      ang = 180 + angle(1,1);
      min = angle(1,2);
      sec = angle(1,3);

end % End of If else loop

DTNA =[ang min sec]; % Function output

end % End of Function

[Walter Roberson]

How are you invoking the function? And which item is it complaining does not exist?

Question: what happens if Direction is not one of those four values? What happens if Direction is a vector of those values?

[Ashikul Yousuf]

Variable 'ang'. The Direction has to be one of those 4.

[Walter Roberson]

Please give an example of how you are invoking the function.

[Ashikul Yousuf]

angle = input('Please enter bearing [Degrees Minute Second]');

Direction = input('Please enter 1,2,3 or 4 to NW NE SE SW','s');

   % Function call to convert Angle and direction to North AZM

      DTNA = Degree_to_NorthAZM(angle, Direction)

[Ashikul Yousuf]

I found the issue.

Direction = input('Please enter 1,2,3 or 4 to NW NE SE SW','s');

Direction isn't defined as string in the function. Thanks for the quick replies.

[Walter Roberson]

Yes, that would do it.