【SAS中文论坛FTP站】SAS 9.3的下载方法 [推广有奖]

1331楼

readxiaoshuo 发表于 2012-12-14 16:29:49

还有效吗？

1332楼

ll1735 发表于 2012-12-14 21:11:40

dasdasdasdasdasdasd

1333楼

gongxun817 发表于 2012-12-15 07:56:42

谢谢！！

1334楼

pertain

发表于 2012-12-15 10:20:18

proc iml;
/* For an explanation of how to construct an iterated function system in SAS, see
http://blogs.sas.com/content/iml ... nsleys-fern-in-sas/
*/
/* Each row is a 2x2 linear transformation */
/* Christmas tree */
L = {0.03  0    0 0.1,
   0.85  0.00  0.00 0.85,
   0.8 0.00  0.00 0.8,
   0.2  -0.08  0.15 0.22,
-0.2 0.08  0.15 0.22,
   0.25 -0.1 0.12 0.25,
-0.2 0.1 0.12 0.2};
/* ... and each row is a translation vector */
B = {0 0,
   0 1.5,
   0 1.5,
   0 0.85,
   0 0.85,
   0 0.3,
   0 0.4 };
prob = { 0.02 0.6 0.1 0.07 0.07 0.07 0.07};
L = L`; B = B`; /* For convenience, transpose the L and B matrices */

/* Iterate the discrete stochastic map */
N = 1e5;       /* number of iterations */
x = j(2,N); k = j(N,1);
x[,1] = {0, 2}; /* initial point */
call randgen(k, "Table", prob); /* values 1-7 */

do i = 2 to N;
x[,i] = shape(L[,k], 2)*x[,i-1] + B[,k]; /* iterate */
end;

/* Plot the iteration history */
y = x`;
create IFS from y[c={"x" "y"}]; append from y; close IFS;
quit;

/* basic IFS Christmas Tree */
ods graphics / width=200px height=400px;
proc sgplot data=IFS;
  title "SAS Christmas Tree";
  scatter x=x y=y / markerattrs=(size=1 color=ForestGreen);
  yaxis display=none;
  xaxis display=none;
run;