I need some assistance with my function program?

Question

Aaron 2012-7-22

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关闭： MATLAB Answer Bot 2021-8-20

I'm not sure where my mistakes are. The following is my main program:

a = input('Enter value for side a: ');  
if a <= 0                           
      disp('Not a valid input! Side "a" must be greater than zero.');break; 
end
b = input('Enter value for side b: ');    
if b <= 0                                 
      disp('Not a valid input! Side "b" must be greater than zero.');break;   
end
c = input('Enter value for side c: ');   
if c <= 0                                 
      disp('Not a valid input! Side "c" must be greater than zero.');break;   
end                                     
if a > b+c                              
      fprintf('\n');                      
      disp('Error: Side "a" must be less than the sum of sides b & c.');break;  
elseif b > a+c                          
      fprintf('\n');                      
      disp('Error: Side "b" must be less than the sum of sides a & c.');break;
elseif c > a+b                          
      fprintf('\n');                      
      disp('Error: Side "c" must be less than the sum of sides a & b.');break;
end
fprintf('\n');                          
[Angle_A,Angle_B,Angle_C] = angle_calc(a,b,c) % This is the correct name of my function program

My function program is:

function [law_cosines] = angle_calc (side_A,side_B,side_C)
angle_A = acosd((b^2+c^2-a^2)/(2*b*c)); 
angle_B = acosd((a^2+c^2-b^2)/(2*a*c)); 
angle_C = acosd((a^2+b^2-c^2)/(2*a*b));

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Answer 1

Image Analyst 2012-7-22

2
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https://ww2.mathworks.cn/matlabcentral/answers/44248-i-need-some-assistance-with-my-function-program#answer_54262

在 MATLAB Online 中打开

Your "function program" needs to look like this:

function [angle_A, angle_B, angle_C] = angle_calc (a, b, c)
angle_A = acosd((b^2+c^2-a^2)/(2*b*c)); 
angle_B = acosd((a^2+c^2-b^2)/(2*a*c)); 
angle_C = acosd((a^2+b^2-c^2)/(2*a*b));

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Answer 2

Walter Roberson 2012-7-22

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/44248-i-need-some-assistance-with-my-function-program#answer_54259

在 MATLAB Online 中打开

Your line

function [law_cosines] = angle_calc (side_A,side_B,side_C)

should be

function [angle_A, angle_B, angle_C] = angle_calc (side_A,side_B,side_C)

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Image Analyst 2012-7-22

Well because he didn't list the actual error (like Jan noted) I actually had to copy and paste, fix it up a little, and run it to find out the error. This should have been discovered immediately by Aaron, particularly if he knew how to use the debugger (which is always faster than debugging via Answers postings).

Aaron 2012-7-22