我编的程序如下turtles-own [energy]8 C$ X" V, V4 O: ?4 N6 e8 H
to setup
& z6 |1 f- }0 f+ n/ ^; U0 N/ H! W, H8 X clear-all
5 w. S- \2 k3 j9 X setup-patches
0 N# `2 S- v9 {' W6 _# L create-turtles 100% h Z/ S# _0 }/ `% J! h4 D
do-plots: y( C& s) y2 y" C
ask turtles [ setxy random-xcor random-ycor ]5 N9 p% h2 ~: c; m/ h. ^) X
end
7 V7 h! v( l) |# D# v5 uto go
' z0 w. B; T H( I; f$ x move-turtles
9 N4 \" X6 L/ _ K+ q# Y# ^ eat-grass D$ U5 q! C) v7 G) F
reproduce4 [& A. I; V6 W5 [# h/ G
check-death
+ Y, q+ F2 o9 {8 z; d3 M' ^ regrow-grass2 f0 o' Z) g. ^ ~7 ^
do-plots. Q7 [7 t) f6 e& `# ^
end' \- j- G+ O% X1 @
to move-turtles$ a, O" d+ O' h* [
ask turtles [
1 I( @) A: K6 b+ Z' Q6 {$ Z7 J5 j right random 360$ ?1 b" U' S8 s4 P ]: K- k
forward 1
8 \/ L5 O9 k/ Y1 I( b set energy energy - 1# h! B# D7 [) C4 S' i0 j/ M: l: r
]! C n3 t. \% _2 g5 R
end2 c# s/ h1 y+ N; h7 r9 H& Y4 {
to setup-patches
/ j1 H9 p: b9 r) ^# B ask patches [ set pcolor green ]3 \ J/ L7 l/ j; w* P( j
end
. e2 i+ `8 _& {7 q! vto setup-turtles0 B5 _( P- n* L, C5 f& V
create-turtles 100; u1 z( P1 f4 J( `" u, U
ask turtles [ setxy random-xcor random-ycor ]
3 U5 X! F' c: ?) I1 s% w' Iend0 Q5 k7 `3 A! f, p# o( b( R
to eat-grass% A8 L) ~6 {/ d6 }# _
ask turtles [
, s/ Y* i+ L, i0 g- ]1 n if pcolor = green [) M9 S) g; y+ P1 ?# S. G0 m N. [. l- F
set pcolor black6 q" f. b. k$ Q: W9 R; z* v* a
set energy (energy + 10)/ H3 W& n7 O4 z+ c/ P- Q& C+ x" t
]' ^3 y9 I2 \1 f/ D2 w
ifelse show-energy?1 i" m4 ~3 i4 H8 m( T5 n
[ set label energy ]" I: P, }0 r) e( k% X( r
[ set label "" ]
2 J; x: r* _3 `5 W ]
0 Q# z! n' {3 Oend
" o( W5 i2 x; ito reproduce
* x+ @. k$ d1 Y8 S ask turtles [
# f2 m" n) w7 }" Z9 `9 ~ if energy > 50 [
; h# B0 \8 W4 y, I( v set energy energy - 50
* c* ^: O' h& q. Z% r) z hatch 1 [ set energy 50 ]$ T7 R( c! o4 h- }0 g
]5 L7 B( q- [6 W' ~1 u- J
]
: n# V: g$ d/ B0 ?8 uend' E2 ^) h/ r' l1 G6 m
to check-death$ ?! h8 {- T- N: |* ?
ask turtles [
t7 Q: R, n( K) V4 _- U* V9 n if energy <= 0 [ die ]( a% S. e! I4 W! I7 \/ k
]) O% m, b& R8 a! |3 i
end
& V% s5 N3 c* ?to regrow-grass
' Q: v+ g9 Z* `9 } ask patches [
% N) |$ E& L( c- \1 t* L6 B D if random 100 < 3 [ set pcolor green ]/ @% I6 @6 i4 l/ Y& T- y
]
1 k) z4 j2 J) c( |end
# p' W: F7 V# A( G7 lto do-plots3 N4 |) H; [. Z# V- f# Q0 d; H
set-current-plot "Totals"
' o \ o( n3 S! N set-current-plot-pen "turtles"( `! H7 v- w, h# A! @4 V# N
plot count turtles3 R6 }; P! i1 k5 n9 U7 k X) D2 r
set-current-plot-pen "grass"
+ m6 w: R$ S; Y3 N9 `) B& m plot count patches with [pcolor = green]
7 C' b5 k/ l1 Y4 O9 N' [end% {& {$ {( _2 i. v
可是运行时提示no such plot: "Totals"
7 U3 y! l$ W: E7 werror while observer running SET-CURRENT-PLOT# x/ S/ w: P' c0 R( m
called by procedure DO-PLOTS
/ z9 N" Z0 Y0 ~+ D0 Z; I& M# ?% L called by procedure SETUP) r; g0 K( f( M V
called by 按钮 'setup'/ i* b) t7 o6 P. @- g
求大神解答啊 |