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)
- p- p7 g+ p/ u%SUBIM Extracts a subimage,s,from a given image,f.
: g) K/ P! g3 E- v%The subimage is of size m-by-n,and the coordinates
& I, l5 W# y: P, y  c%of its top,left corner are(rx,cy).
s=zeros(m,n);
3 d/ F- c3 j# v4 c+ F+ prowhigh=rx+m-1;
colhigh=cy+n-1;
/ a  Q/ Q' o; b/ H2 i  s& O: ^xcount=0;
# M9 T7 i$ @  P7 q1 Xfor r=rx:rowhigh
% b" V( \3 ~1 I/ N) x  \. `  Xxcount=xcount+1;
ycount=0;
( U0 ?. }3 F; p$ l- D+ Vfor c=cy:colhigh
- L: `, _  J  D* e- s* C! L4 m4 h) yycount=ycount+1;
- H( X* J$ c4 f2 ~6 v9 _9 k( [s(xcount,ycount)=f(r,c);
end
end
$ G$ ]7 ?/ u4 g! C9 p+ A

beachsun

自己给自己打个气