不知道怎么让下面的MATLAB程序输出结果了，很无语，请帮助

beachsun

function s=subim(f,4,4,2,2)
%SUBIM Extracts a subimage,s,from a given image,f.
, O2 ]/ g/ W8 j+ f: m9 k%The subimage is of size m-by-n,and the coordinates
1 \0 ^; J# r3 o( v" w& b. \  P%of its top,left corner are(rx,cy).
s=zeros(m,n);
# r- Y1 u! i7 N9 Z) u8 V$ urowhigh=rx+m-1;
colhigh=cy+n-1;
3 L6 J+ y, v: G, bxcount=0;
# W1 [* C' @' D: {0 u2 H# \for r=rx:rowhigh
xcount=xcount+1;
ycount=0;
, s4 x, ~, Z9 q6 w5 zfor c=cy:colhigh
% W5 r6 s" v$ u( uycount=ycount+1;
( Z( M" Z* i) k% Qs(xcount,ycount)=f(r,c);
' ~" m5 X* s" q4 y# Uend
9 {- t9 ]7 J. v, x  c4 yend

beachsun

自己给自己打个气