Combining multiple functions within one script

Question

Brooks Nelson 2017-2-19

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https://ww2.mathworks.cn/matlabcentral/answers/325839-combining-multiple-functions-within-one-script

评论： Image Analyst 2024-5-16

I have three functions I would like to put into one script. What would be the correct steps to do so. here are the following functions I have written.

function [] = gravitationalForce(m1,m2,d)
%{m1 = mass 1, m2 = mass 2, d = distance%}
G = 6.672 * 10^11;
syms F
F = (G*m1*m2/(d^2));
display(F)
end
function [] = velocityCalc(u,a,s)
%{u = velocity,a = acceleration,s = distance traveled%}
disp('V^2 =')
v = (u^2 + (2*a*s));
disp(v)
end
function [] = distanceTraveled(u,a,t)
%{u = velocity,a = acceleration,t = time%}
syms s
s = (u*t)+1/2*a*t^2;
display(s)
end

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Walter Roberson 2022-2-3

How are you invoking the function, and what is the complete error message?

Kazi Newaz 2022-2-3

extremely sorry to have bothered you, it was an issue with me not having the path set up right, now it is working, thank you so much for the solution

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Answer 1

Mohammad Askari 2018-6-30

15
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编辑：Mohammad Askari 2019-11-18

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Another approach is to create a class with static methods with all your sub-functions. Save the following code as ALLFUNCS.m

classdef ALLFUNCS
    methods(Static)
          function result = SumElements(a,b,c)
              result = a + b + c;
          end
          function [prod,div] = MultiplyDivide(v1,v2,v3)
              prod = v1 * v2 * v3;
              div  = v1 / v2 / v3;
          end
    end
end

Then you can simply call the sub-functions like this:

s = ALLFUNCS.SumElements(3,4,5);
[p,d] = ALLFUNCS.MultiplyDivide(8,3,5);

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leanne dong 2020-4-2

this method does not seem to work for case where a function depends on the previous one.

Any suggestions?

Mohammad Askari 2020-4-3

编辑：Mohammad Askari 2021-10-31

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@leanne dong, it actually does. In the example below, the first function calls the other one. Is this what you are looking for?

classdef ALLFUNCS
    methods(Static)
        
          function result = SumElements(a,b,c)
              result = a + b + c;
              string = ALLFUNCS.IsGreaterThanZero(result);
              disp(['the answer is greater than zero: ',string]);
          end
          
          function str = IsGreaterThanZero(value)
              if value > 0
                  str = 'true';
              else
                  str = 'false';
              end
          end
          
    end
end

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Answer 2

Anders Bergåker 2017-10-26

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Well, I find this limitation incredibly annoying so I use a workaround with the sfunc command. The first function takes the function you actually want to call as an argument. I've found this workaround ages ago, it might have some drawbacks I'm unaware of since I'm not an Matlab expert.

Put all this code in an .m file, eg. myLib.m which then will act as a function library. The call to use a specific function would then be:

myLib('distanceTraveled', u, a, t)

It work fine with returnvalues as well. Examaple of myLib.m:

function varargout = sfunc(varargin)
   [varargout{1:nargout}] = feval(varargin{:});
end
function [] = gravitationalForce(m1,m2,d)
...
end
function [] = velocityCalc(u,a,s)
...
end
function [] = distanceTraveled(u,a,t)
...
end

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Marcel 2024-5-15

Works fantastic and is elegant. Thanks!

Image Analyst 2024-5-16

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You could also comment out the function(s) with %{ and %}.

For example:

%{
function out = MyFunction(in)
out = 2 * in;
end
%}

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Answer 3

Image Analyst 2017-2-19

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You can do that but velocityCalc() and distanceTraveled() would only be available/seen to functions within the same file. If they need to be used by other m-files, you'd have to have them in separate files, unless they were a class. I've done this so I know it works. If you had a class with those functions in it, then any file could call any of those functions as a static method of the class.

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Answer 4

John D'Errico 2017-2-19

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编辑：John D'Errico 2017-2-19

If your goal is to use those function independently, then they need to be saved as separate m-files, NOT in one large file. While it would indeed be possible to do that in theory, you would need to learn a fair amount about function handles to do so. As well, you would need to call a main function, then having it return function handles for each sub-function that you might call in the future.

If you are somehow thinking of having an actual script that also has a mainline, but with functions defined within, that is not possible. Scripts cannot also contain function definitions, except for the case of function handles created in one line.

Simple save each function as an independent m-file.