SSS Triangle functions, need output help

2011 4 22
3 个回答
回答已采纳
更新时间：2021 6 1
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0 个投票

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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 采纳的回答

Chirag Gupta
Chirag Gupta 2011-4-22

0 个投票

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
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
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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更多回答（2 个）

Walter Roberson
Walter Roberson 2011-4-22

0 个投票

You only define ang1, ang2, and ang3 if Area > 0. What happens if the Area is not greater than 0 ?

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Kyle
Kyle 2011-4-22
Oh,typo.
Area <=0
fprintf('The 3 sides do NOT form an open triangle!\n');
But i dont understand how i can define the equations for ang1 ang 2 and ang3 without causing it to output them separate from the fprintf statements.

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Aqsa Saleem
Aqsa Saleem 2021-6-1

0 个投票

given triangle with sides a,b,c write a program to find whether it is an isosceles triangle in MATLAB programing

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