程序:
for(i in 1:5){
s<-sample(ddt[1, ],8, replace=T)
print(s)}
输出结果:
X150 X280 X50 X280.1 X190 X150.1 X270 X230
A1_40 4.365 0.625 0.875 0.625 4.315 4.365 2.335 3.415
X200 X150 X150.1 X230 X30 X90 X150.2 X230.1
A1_40 4.515 4.365 4.365 3.415 0.795 1.565 4.365 3.415
X240 X220 X250 X10 X330 X140 X270 X300
A1_40 3.705 3.425 3.195 0.445 0.485 2.355 2.335 0.485
X130 X90 X220 X40 X270 X40.1 X170 X140
A1_40 2.245 1.565 3.425 0.705 2.335 0.705 4.715 2.355
X90 X350 X330 X310 X350.1 X20 X230 X210
A1_40 1.565 0.565 0.485 0.475 0.565 0.565 3.415 4.235
s里只有最后一次抽样的值:
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