SSS Triangle functions, need output help

Question

Kyle 2011-4-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/6059-sss-triangle-functions-need-output-help

回答： Aqsa Saleem 2021-6-1

My function is outputting ang1, ang2, and ang3 in addition to my fprintf statements, why? and how to i fix it? Question asks for my to calculate it the triangle is valid by checking the area.

function [ang1 ang2 ang3 ] = triangle(s1,s2,s3)
%TRIANGLE calculates the degrees of all angles given the length of all
%sides.;
s1=input('Please input side 1: ');
s2=input('Please input side 2: ');
s3=input('Please input side 3: ');
s=(s1+s2+s3)/(2);
Area=sqrt(s*(s-s1)*(s-s2)*(s-s3));
if Area > 0
ang1=acosd((s2^2 + s3^2 - s1^2)/(2*s2*s3));
ang2=acosd((s3^2 + s1^2 - s2^2)/(2*s3*s1));
ang3=acosd((s1^2 + s2^2 - s3^2)/(2*s1*s2));
    fprintf('The angle opposite side 1 is %.2f deg\n',ang1);
    fprintf('The angle opposite side 2 is %.2f deg\n',ang2);
    fprintf('The angle opposite side 3 is %.2f deg\n',ang3);
elseif Area >= 0
    fprintf('The 3 sides do NOT form an open triangle!\n');
end
end

I'm also having a problem with triangle inputs (1,2,3), it says the correct thing but outputs an error with it

Error in ==> triangle at 5
s1=input('Please input side 1: ');
??? Output argument "ang1" (and maybe others) not
assigned during call to "P:\triangle.m>triangle".

do the input statements need to be outside the function?

FINAL SOLUTION:

function [ang1 ang2 ang3]=triangle(s1,s2,s3)
%TRIANGLE calculates the degrees of all angles given the length of all
%sides.;
ang1=acosd((s2^2 + s3^2 - s1^2)/(2*s2*s3));
ang2=acosd((s3^2 + s1^2 - s2^2)/(2*s3*s1));
ang3=acosd((s1^2 + s2^2 - s3^2)/(2*s1*s2));
end
   %Test_triangle
  s1=input('Please input side 1: ');
  s2=input('Please input side 2: ');
  s3=input('Please input side 3: ');
  s=((s1+s2+s3)/(2));
  Area=sqrt(s*(s-s1)*(s-s2)*(s-s3));
  if Area > 0
        [ang1 ang2 ang3]=triangle(s1,s2,s3);
        fprintf('The angle opposite side 1 is %.2f deg.\n',ang1);
        fprintf('The angle opposite side 2 is %.2f deg.\n',ang2);
        fprintf('The angle opposite side 3 is %.2f deg.\n',ang3);
  elseif Area <= 0
        fprintf('The 3 sides do NOT form an open triangle!\n');
  end

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Answer 1

Chirag Gupta 2011-4-22

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在 MATLAB Online 中打开

This is because your function defines them as output arguments

function [ang1 ang2 ang3 ] = triangle(s1,s2,s3)

MATLAB expects 3 outputs as defined by ang1,ang2 and ang3. Thats why you get the error.

If you don't want the outputs, just define the function as:

function triangle(s1,s2,s3)

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Chirag Gupta 2011-4-22

similarly if you don't want to supply inputs to the function you don't need to pass them as input args

function triangle()

% ......

s1 = input

etc

Kyle 2011-4-23

I found out what was wrong, i miss read the question. I needed to create the function and then a test program to run it. My mistake. Thanks for the help.

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