程序如下:
gen zo cyl p0 0 0 0 p1 1 0 0 p2 0 2 0 p3 0 0 1 size 4 5 4
gen zo reflect norm 1 0 0
gen zo reflect norm 0 0 1
model mohr
prop b 1.19e10 sh 1.1e10
prop coh 2.72e5 fric 44 ten 2e5
fix x y z range y -.1 .1
fix x y z range y 1.9 2.1
ini yvel 1e-7 range y -.1 .1
ini yvel -1e-7 range y 1.9 2.1
ini pp 1e5
hist gp ydisp 0 0 0
hist zo syy 0 1 0
hist zo syy 1 0 0
step 3000
plot his -2 -3 vs 1
其中的yvel 及最后一句命令语句是什么意思