# Why can't I put two equations in one function file?

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Rachel Dawn 2018 年 2 月 28 日
コメント済み: the cyclist 2020 年 5 月 1 日
function a,b=myfunction(x)
a= @(x) 5-5*exp((1/3)*x) + (16- x^2)^(1/2)
b= @(x) (-5/3)*exp((1/3)*x) - (16- x^2)^(-1/2)
I basically want this function to give me f(x) value (equation listed next to a), and I want it to give me the f'(x) value (equation listed next to b).
Why is it that I can't have my input value go into two separate equations and come out as two outputs?
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I know that I can create a function file f(x) with equation '5x^2 + 10' and then create its derivative function file:
function result= fd(x)
f(x)
result=10x;
and it will print out both values that I want (f(x) and f'(x)). But, do I really have to make two files for these two equations instead of just grouping them in one file?

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### 回答 (1 件)

the cyclist 2018 年 2 月 28 日

It's just a simple syntax error. Try
function [a,b]=myfunction(x)
Note the square brackets around the outputs. You will get two outputs from this function.
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the cyclist 2020 年 5 月 1 日
It's still the same syntax. You will get outputs that are scalars or matrices.

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