运行包含功能定义的八度脚本文件

发布于 2025-01-30 16:03:56 字数 454 浏览 3 评论 0 原文

我有一个非常新的八度问题。
在Octave控制台中运行此代码正常：

function fibo = recfibo(n)
  if ( n < 2 )
    fibo = n;
  else
    fibo = recfibo(n-1) + recfibo(n-2);
  endif
endfunction
disp(recfibo(5))

通过将此代码插入为 file.m 的外部文件中，并通过 octave file.m 执行它。：

警告：功能名称'recfibo'不同意函数文件名 '/users/admin/google drive/file.m' 错误：'n'未定义附近的第2列第8列错误：从第2列第3行的八度

我应该如何解决此特定问题？

原文

I've a very newbie octave question.
Running this code in octave console is working fine:

function fibo = recfibo(n)
  if ( n < 2 )
    fibo = n;
  else
    fibo = recfibo(n-1) + recfibo(n-2);
  endif
endfunction
disp(recfibo(5))

By inserting this code in an external file named for example file.m, and executing it through octave file.m an error occurs:

warning: function name 'recfibo' does not agree with function filename
'/Users/admin/Google Drive/file.m'
error: 'n' undefined near line 2 column 8 error: called from
octave at line 2 column 3

How should I resolve this particular problem?

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困倦 2025-02-06 16:03:56

添加 1; 作为文件的第一行：

1;

function fibo = recfibo(n)
  if ( n < 2 )
    fibo = n;
  else
    fibo = recfibo(n-1) + recfibo(n-2);
  endif
endfunction

disp(recfibo(5))

以函数定义开头的任何M文件是函数M文件，而不是脚本M文件。通过向顶部添加毫无意义的语句，您可以将其变成脚本。

在MATLAB中（从最近出现）中，脚本M文件可以在脚本末尾定义函数。在那里，您将 disp 行放在文件的顶部，并在末尾将函数块放置，而没有任何脚本行。但是，八度需要在使用它们之前定义函数，因此必须在使用该函数的脚本行之前。八度允许在MATLAB引入该功能之前的脚本文件中的函数定义，因此它们的实现与MATLAB的功能不兼容。

Add 1; as the first line of the file:

1;

function fibo = recfibo(n)
  if ( n < 2 )
    fibo = n;
  else
    fibo = recfibo(n-1) + recfibo(n-2);
  endif
endfunction

disp(recfibo(5))

Any M-file that starts with a function definition is a function M-file, not a script M-file. By adding a meaningless statement to the top, you turn it into a script.

In MATLAB (since fairly recently), a script M-file can define functions at the end of the script. There you'd put the disp line at the top of the file, and have the function block at the end, without any script lines after it. However, Octave requires functions to be defined before you use them, hence it has to come before the script line that uses the function. Octave allowed the definition of functions within a script file before MATLAB introduced that feature, hence their implementation is not compatible with that of MATLAB.

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回首观望 2025-02-06 16:03:56

如@crisluengo提供的答案所述，您已经创建了一个函数文件，而不是脚本文件，并且对其进行处理 在八度中 不同。因为它是一个函数文件octave通过调用其定义的 no gram>和 nargout = 0 的函数来执行它。因此，您将遇到一个错误，即 n 不确定。

另一个问题是函数名称'recfibo'不同意函数文件名'file'。在这种情况下，八度在内部将函数的名称更改为功能文件的名称，以便将名称更改为'file'。因此，八度函数本身会忘记原始功能名称，不幸的是，该函数无法递归地调用自己！

我喜欢@crisluengo的答案，但我认为使用函数文件而不是脚本文件的愚蠢和优选的方法是 emansey ，尽管脚本文件解决方案是 onlylly 在先前的八倍版本中起作用的解决方案八度3.x）。

您可以将代码更改为：

function file
    disp(recfibo(5))
endfunction
function fibo = recfibo(n)
    if ( n < 2 )
        fibo = n;
    else
        fibo = recfibo(n-1) + recfibo(n-2);
    endif
endfunction

As stated in the answer provided by @CrisLuengo here you have created a function file instead of a script file and they are treated differently in Octave. Because it is a function file Octave executes it by calling the function it defines with no arguments and nargout = 0. So you will get an error that n is undefined.

Another problem is that the function name 'recfibo' does not agree with function filename 'file'. In such cases Octave internally changes the name of the function to the name of the function file so the name is changed to 'file'. Therefor Octave and the function itself will forget the original function name and unfortunately the function cannot call itself recursively!

I like the @CrisLuengo 's answer but I think the more idiomatic and preferable way is always using function files instead of script files, though the script file solution is the only solution that works in previous Octave versions (Octave 3.X).

You can change your code to:

function file
    disp(recfibo(5))
endfunction
function fibo = recfibo(n)
    if ( n < 2 )
        fibo = n;
    else
        fibo = recfibo(n-1) + recfibo(n-2);
    endif
endfunction

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