Defining inputs for subfunctions

Question

Stephen 2011-12-8

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/23448-defining-inputs-for-subfunctions

Hey,

I'm writing some code that involves using set inputs (that I want to be able to change easily) in multiple subfunctions.

Take the following example;

    function [ output_args ] = Untitled2( input_args )
  clc;
x=0:0.01:5;
plot(f(x),x,g(x),x)
end
function [f_value]=f(x)
speed=6;
f_value=0.5.*speed.*x;
end
function [g_value]=g(x)
speed=6;
g_value=(x.^2)./speed;
end

How would I go about being able to define speed only once and it being 'called up' by any and every subfunction that uses it? I tried looking into nesting but got utterly confused :/ Is there a simple way to do this?

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Answer 1

Walter Roberson 2011-12-8

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/23448-defining-inputs-for-subfunctions#answer_30778

在 MATLAB Online 中打开

function [ output_args ] = Untitled2( input_args )
    speed = 6;
    function [f_value]=f(x)
      f_value=0.5.*speed.*x;
    end
    function [g_value]=g(x)
      g_value=(x.^2)./speed;
    end
    x=0:0.01:5;
    plot(f(x),x,g(x),x)
  end

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Walter Roberson 2011-12-8

Yes. But it is important that the variable to be shared be defined before you define the nested functions that use the variable.

Stephen 2011-12-8

Haha, yeah I'd literally just found that. Was trying to impliment it in my own code and was getting very confused why it wouldn't run as I couldn't see anything wrong with it. Then I had a brainwave and moved my variable to the start of my code and it worked a treat :)

Thank you very much for the help :)

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