我编的程序如下turtles-own [energy]0 B% `3 p* c ]5 |1 j9 F
to setup
- M. @) h& b- J2 y2 H clear-all
* |- i+ O/ `% ?4 G setup-patches4 I1 u5 c) s* c0 A' P; q
create-turtles 100
5 ^, h/ k% V' ^, }3 k, k do-plots
! Z1 m9 N2 C; v" z2 f3 Y3 T9 W0 g ask turtles [ setxy random-xcor random-ycor ]# A8 a7 c+ k/ d" P
end
* G0 f; ^9 e& {2 O+ kto go5 g" F9 E$ r7 [9 ?' t7 x* F
move-turtles
8 }' x; F2 o/ l8 d; ? b eat-grass
/ u; A3 e% D) ]3 n4 C reproduce0 S3 \, z* P4 J4 Q# @/ D
check-death
( L" _9 O; W: s% [+ j: X: D# V regrow-grass
0 I! k2 N0 n2 _2 ^/ A* m do-plots- c' m) y5 W/ u* {8 o( M
end8 v& Y- e7 f6 c' R# a( _% W; F
to move-turtles
( Q8 f' e' s* n7 T4 V ask turtles [# y3 t: o% C* [" ?, r2 z8 j
right random 360
2 w- i7 Y( i. i5 _, L2 k+ |5 h forward 1# R- L% @9 _+ Y3 j/ O' p4 y F, h
set energy energy - 1
- a+ Q; ~' l8 w+ R ]
. c0 m) t5 b% A$ Y3 Hend
# `! h9 v1 S7 _' t- oto setup-patches$ G) K/ _' S, R, U/ K. Q- h
ask patches [ set pcolor green ]( P/ A" `# I' D: \
end# ^6 Z; ^, p! y9 m
to setup-turtles
% E1 D% D( {6 [; J! Y create-turtles 100! t' ?+ V+ R' n7 d8 v/ t
ask turtles [ setxy random-xcor random-ycor ] @( a- c: q6 N/ }8 [
end4 |) A; E# d& v: \1 u: Y+ _: x5 z5 l
to eat-grass
& [6 ?# r* E/ q8 Z) g; @ ask turtles [- `- ]& i3 ^# E0 v1 s$ l% x4 }
if pcolor = green [ x) a* i9 J! q1 w% I/ i9 v: Y
set pcolor black
5 X/ L- P: M @' W" q. K! Z set energy (energy + 10), W5 W, q7 C Y- I6 K9 x! n4 v
]% [- w9 a8 @8 \4 U
ifelse show-energy?
/ j" X3 x6 o2 S% t9 D; y6 K [ set label energy ]6 e+ e6 _! k+ R& G
[ set label "" ]% M& d) Q( s0 Z9 M: X% m8 G
]0 f9 J" X6 h, O; [/ ~
end7 K9 Q; l8 h! Q9 X: P# Y7 @
to reproduce
% I1 a/ Q! U8 T d: N0 @5 G- A0 v ask turtles [. t5 e; A0 y- m7 @5 [
if energy > 50 [
+ }: F2 s' z' X; Y1 f }# y set energy energy - 50
- h/ @ b/ t' U. W! x, e7 B. l: t hatch 1 [ set energy 50 ]
; {# K. `4 Q$ j; q* \& ~ ]( a) }: E# x! A+ m! Z
]- |7 z3 K, M9 d. a
end' Z" h2 a, y# ~- {/ ?6 a
to check-death, I" v) S5 z. D1 B/ W( Z' s7 |
ask turtles [4 r$ b5 N0 \7 O4 h+ n
if energy <= 0 [ die ]
/ b; D9 E) X" H3 X/ W ]
5 R: g" a# V+ h4 {2 m) Gend: }. }4 I3 V5 O" W L, G7 }* k
to regrow-grass
( u* R- \9 k: d+ n ask patches [ j' v& k: J# X
if random 100 < 3 [ set pcolor green ]; W& C! |$ M& E& o8 E, U
]3 I" l, f: ~* _* H' f3 _. ^
end- G, W3 ^: y, P3 v/ D4 P" Q4 R: @6 s
to do-plots7 \* z! M+ C" {5 \7 T
set-current-plot "Totals"
, ^& g& z/ G: H$ p" q0 q" _" L set-current-plot-pen "turtles"
3 b; a5 ]4 Z- b2 _ plot count turtles
) K/ m2 z- o! |; v$ n5 n6 R% g7 O set-current-plot-pen "grass"# X+ {+ _9 z3 P/ r/ w* R
plot count patches with [pcolor = green]
/ G4 X$ V! X: M Q, k$ F ?end; a' Z# i9 O! Y9 d
可是运行时提示no such plot: "Totals"
$ i) K* L" _1 g* z! Aerror while observer running SET-CURRENT-PLOT2 V0 g. [/ S4 v$ V4 D
called by procedure DO-PLOTS
# @: M& Z5 r; R8 {( ` X called by procedure SETUP; s" }# C& ]/ P \5 F! E. L' B! h! {7 j
called by 按钮 'setup'
7 V+ S: \( m6 f! a求大神解答啊 |