How to create a function with multiple calculations

Question

Oskar 2017-12-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/373185-how-to-create-a-function-with-multiple-calculations

评论： Tony 2022-8-24

I have matlab code with 3 different calculations and I am unsure how to put it into a function (I want to solve the code using a function rather than have the calculations embedded in the code.)

a = sqrt((x1-x2)^2+(y1-y2)^2);
b = sqrt((x2-x3)^2+(y2-y3)^2);
c = sqrt((x1-x3)^2+(y1-y3)^2);
s=(a+b+c)/2;
k=sqrt(s.*(s-a).*(s-b).*(s-c));

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Answer 1

YT 2017-12-15

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https://ww2.mathworks.cn/matlabcentral/answers/373185-how-to-create-a-function-with-multiple-calculations#answer_296468

编辑：YT 2017-12-15

在 MATLAB Online 中打开

So I think you're looking for something like this

function [k] = myawesomefunction(x1,x2,x3,y1,y2,y3)
%MYAWESOMEFUNCTION with 6 input arguments x1, x2, x3, y1, y2, y3 and 1
%output argument k
   a = sqrt((x1-x2)^2+(y1-y2)^2); b = sqrt((x2-x3)^2+(y2-y3)^2); c = sqrt((x1-x3)^2+(y1-y3)^2);
   s=(a+b+c)/2;
   k=sqrt(s.*(s-a).*(s-b).*(s-c));
end

If you also want the other variables a, b, c and s, you can just change it to this

function [a, b, c, s, k] = myawesomefunction(x1,x2,x3,y1,y2,y3)

You need to save the file with the same name as you gave the function, so in this case save it as 'myawesomefunction.m'

You can call your function in your main file like so:

myoutputK = myawesomefunction(12,23,45,56,78,91); %if you only have 1 output argument
[outputA,outputB,outputC,ouputS,outputK] = myawesomefunction(12,23,45,56,78,91); %if you have more than 1 output

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mahroo shiranzaei 2021-10-29

Hello and thanks for the great explanation.

Tony 2022-8-24

but if you are using myawesomefunction as a function from file in the problem-based Optimize live editor, outputB/outputC/outputS/outputK will not be considered in the problem. How to overcome this issue if I really would like to combine all my constraints in one function file?

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Answer 2

James Tursa 2017-12-15

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https://ww2.mathworks.cn/matlabcentral/answers/373185-how-to-create-a-function-with-multiple-calculations#answer_296467

编辑：James Tursa 2017-12-15

在 MATLAB Online 中打开

Create a file called triangle_area.m on your path (e.g. in your working directory) and inside that function have this code:

% Put a description of the function here with purpose, syntax, etc.
function k = triangle_area(x1,y1,x2,y2,x3,y3)
% insert your calculation code here
end

You might consider changing your side distance formulas so they are vectorized for arrays of x1, y1, etc. E.g.,

a = sqrt((x1-x2).^2+(y1-y2).^2);

etc.