matlab中组间设置block,.m文件如何变成simulink中可以调用的block

我就用的是S-Function函数，会报错是：Output returned by S-function 'pink_noise_s2' in 'xahrng_sim/S-Function1' during flag=3 call must be a real vector of length 1。

我现在写的程序是如下：求高手帮我debug啊，着急中！

function [sys,x0,str,ts] = sfuntmpl(t,x,u,flag)

%SFUNTMPL General M-file S-function template

%   With M-file S-functions, you can define you own ordinary differential

%   equations (ODEs), discrete system equations, and/or just about

%   any type of algorithm to be used within a Simulink block diagram.

%

%   The general form of an M-File S-function syntax is:

%       [SYS,X0,STR,TS] = SFUNC(T,X,U,FLAG,P1,...,Pn)

%

%   What is returned by SFUNC at a given point in time, T, depends on the

%   value of the FLAG, the current state vector, X, and the current

%   input vector, U.

%

%   F