我编的程序如下turtles-own [energy]
: F, F$ w6 ]: F) y6 T5 mto setup
7 J- \' C( D6 I+ x clear-all
* K7 d0 y- B& ?2 z! a0 K# K& J setup-patches
) K6 \8 q: \8 G: d create-turtles 100
/ M+ ~ ^* T# _ do-plots0 r4 `( g" Z( y$ J1 ?' Y
ask turtles [ setxy random-xcor random-ycor ]! K6 K3 x) h' K' b9 c* P
end
; {; h: K7 |$ G; w# v# P, }7 ~1 Hto go
" F2 _$ |3 N: s+ l2 Y: C& [' s move-turtles1 l$ c' K+ k+ m: ~
eat-grass) R5 R4 W, a# ^8 h$ c% c/ p
reproduce
O. r' i M* F1 ^- ^3 t% n check-death
5 I# T5 C5 M, v; m# G( u regrow-grass$ c; f0 E2 m$ j
do-plots
4 i/ y, t+ t4 T5 b: b7 o8 ]- ^- Oend5 T9 o. m* R) }8 Y% q7 [& l) b
to move-turtles7 s* V* o; E6 m; S! w p3 T' n* p
ask turtles [
2 ^ `) o- j9 Q) o' U right random 360
; s7 [, A5 R& K* ?3 [" { forward 14 J' v* q0 B: i' [! O" ]
set energy energy - 1# i8 f) h( x( ~8 P! w4 {8 L( D& E
]
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to setup-patches2 y: R d; J9 m) s& }
ask patches [ set pcolor green ] V" B* t" h8 s' n& U
end
4 ~+ x5 d& l; S: x! {5 q2 oto setup-turtles+ j, {4 h K$ j* F
create-turtles 100* h( o' m* h* C% L" r* N
ask turtles [ setxy random-xcor random-ycor ]0 L7 `8 k' K8 c7 O1 L/ O- M2 E* N
end1 g! P; F* @7 e: J N
to eat-grass1 ]: B- c1 [) z7 I0 S
ask turtles [" ?. Q( H" h! g% E7 `+ r& {
if pcolor = green [
" s9 J- D, r4 g$ e/ v set pcolor black
7 C% q. Y; [4 s- @" [ set energy (energy + 10)* n; ?$ d$ j* G: ^# T* z0 w
]
3 N) [: C: p7 Y; p2 S ifelse show-energy?$ S4 @* f* C+ [8 y$ @! w0 Q2 x/ ~8 ^
[ set label energy ]" {7 R+ O( X. m8 A! e+ D; k
[ set label "" ]# w* h$ n2 t& D7 Z5 j& _" r
]
# _/ _3 d, @5 I- c9 `- f+ h$ v6 w, w9 Eend
6 p$ a3 P: q( o7 {: u9 }* mto reproduce
1 a& J4 @& K8 g& a ask turtles [
+ t k' {7 M/ M5 ~* z3 ^, A$ } if energy > 50 [" @9 B6 c- Y4 J2 s6 E
set energy energy - 50( G/ H: h2 Y$ ^7 Y4 A
hatch 1 [ set energy 50 ]
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end
; X. {8 [& o' @# ]* M, C$ Ito check-death
8 A% @+ M6 w: n ask turtles [/ K( f$ e4 b) s- x" C8 O g. [
if energy <= 0 [ die ]
0 w( n" A3 O5 \9 @$ c+ i- g+ |/ V1 q ]
[- M1 G! W5 i7 xend# T$ k! F a$ Y
to regrow-grass
' f0 i; T, Q" \! N' T6 F: t# e ask patches [
y7 h5 a" a9 `/ D: [ if random 100 < 3 [ set pcolor green ]
5 X }: [6 h1 x) U6 D* Q0 G. b, i7 u ]
9 T: C7 P7 m% h5 X' Hend
7 i6 B. x% e/ T8 q2 ato do-plots
0 p0 `1 `2 j! P9 v3 M5 i8 t8 _$ M set-current-plot "Totals"
G% Z C* j. Z! i set-current-plot-pen "turtles"* v! U; e/ Z/ D; A- M9 c, y
plot count turtles
+ L+ V3 S6 B) |. d/ ?! A set-current-plot-pen "grass"
* N% {$ E! G: H/ ~9 g8 q+ @# R plot count patches with [pcolor = green]
5 i9 C5 e; o1 j) g* j3 E. r# Eend5 ]4 r/ f/ q% Z: u8 \- a
可是运行时提示no such plot: "Totals"
( Y, i5 h, w) Z7 u0 h/ Xerror while observer running SET-CURRENT-PLOT, o: _" I4 A. F. ?
called by procedure DO-PLOTS
& ^. F' d- W4 R/ S+ g' s called by procedure SETUP
3 w1 t* }- c9 ?2 H, n8 e. [+ X called by 按钮 'setup'
1 L7 b3 \* a6 K$ k0 i' n y求大神解答啊 |