首先，built-in 函数是不公开的，其次，built-in 函数并非是用我们熟知的matlab语言写的，所以，即使给你了，你也未必能看懂。matlab 最初是在两个高效的底层矩阵计算包 LINPACK 和 EISPACK 上发展出来的，这两个包的升级版本叫做 LAPACK （关于这些的介绍，你可以参考：http://www.mathworks.com/company
... porates-lapack.html）。能写出这些包并且对其维护的人都是全球顶尖编程高手，他们不仅要求编程牛逼，还要精通线性代数和矩阵运算。所以，一般人根本不可能接触到matlab这些底层的东西。曾经有很多matlab爱好者向mathworks 询问并索要过built-in函数源代码，都被拒绝了，他们收到的回复是：
You can read and edit the source code for M-file functions that ship with
MATLAB; the only way to read and edit the built-in functions like FFT is to
get a job with The MathWorks. We don't distribute the built-in source code
for MATLAB.
--
Steve Lord
You can read and edit the source code for M-file functions that ship with
MATLAB; the only way to read and edit the built-in functions like FFT is to
get a job with The MathWorks. We don't distribute the built-in source code
for MATLAB.
--
Steve Lord
