我编的程序如下turtles-own [energy]
, I! H5 g. o: a2 v4 J. lto setup
/ a* U) f' F' q clear-all
* \9 S+ J: S' F5 c setup-patches+ o& L5 l1 r( D( X
create-turtles 100; c* d. q/ h3 ^3 h. m d( u
do-plots
! [6 @ ?. D9 {4 J- d ask turtles [ setxy random-xcor random-ycor ]; q7 P2 Q/ K. d' [
end: V- W, A W# `3 W& C# Q: M: ~
to go7 a: j" F C) u. a: _$ L6 a
move-turtles3 y A% H3 e9 B2 I6 L P) g3 b2 H
eat-grass
7 p9 h; V% B! F1 U3 [ reproduce# q; @ z% @" j# G+ a& n
check-death
# c4 y- J: m/ I/ D. z. a* j/ m regrow-grass4 R, @' y$ C8 i& Y) G4 \( V9 b
do-plots
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to move-turtles
0 G4 K' n O" \1 p, }/ h) O ask turtles [2 @. o' X" }+ F3 }
right random 360, S4 y v8 C! h
forward 15 D6 V9 \% y" h7 ?
set energy energy - 1
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end! h3 U3 V; i& K6 x
to setup-patches" |$ @4 W; O2 X4 L/ x( D5 `& J h
ask patches [ set pcolor green ]
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to setup-turtles3 \! O2 S1 I- c' {- {9 ^2 D9 }
create-turtles 100; j2 a3 t/ H/ h s" j
ask turtles [ setxy random-xcor random-ycor ]' Y7 {# V- G* a1 \
end; J. _+ Z& _0 D" Q8 @' \ _4 x1 g
to eat-grass
4 d8 a& i* p! q5 A; G ask turtles [7 Q1 z- x! t! {) v" j* _5 |
if pcolor = green [0 V0 L, s2 Q& e0 ~- j# l
set pcolor black
" Z' _6 b- L' p6 G set energy (energy + 10)& [6 e4 k1 y" L L/ R9 L" V
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ifelse show-energy?+ X3 C# Z6 h( B
[ set label energy ]& z5 e) [% T* K* A
[ set label "" ]
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end
% i! W; |, I3 q6 Pto reproduce, c. u; g% c5 }: V
ask turtles [
M. G$ s, V6 Q( k' u" X& d" [ if energy > 50 [3 o9 ~* i8 u$ z2 V
set energy energy - 50
/ x; d" k, _* n( e hatch 1 [ set energy 50 ]
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to check-death
5 o# x: f) p' s: o9 c/ O$ | ask turtles [
2 e5 u2 o" |, e+ P( Q& K3 N1 @; }! M if energy <= 0 [ die ]
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( i$ H% C9 w G6 Xend. Q/ x: t. D: T9 w
to regrow-grass6 u3 T4 f" }, f. ` v
ask patches [7 J0 f+ u% p+ C$ }, {
if random 100 < 3 [ set pcolor green ]- F5 {4 m# O0 i& ?1 z: n, j
]
0 x9 P v. L+ T7 pend
$ }4 W8 h8 u& ~; L. m2 gto do-plots
1 R, N5 L$ i+ A' Q3 r/ C! M set-current-plot "Totals"$ p+ y/ y7 l4 S. q
set-current-plot-pen "turtles": C8 i; g, ~- n) T, v4 p( x( K
plot count turtles
8 w& C% m6 G1 t% S9 H set-current-plot-pen "grass"
4 S3 K0 R/ E* y4 L1 } plot count patches with [pcolor = green]# o* T" a; p' j3 {, j. \8 _- P
end
; U! G& B3 s0 Y: j可是运行时提示no such plot: "Totals"5 O K$ [9 [5 s* ^3 K- ~0 M. z
error while observer running SET-CURRENT-PLOT
" m1 d% A/ [+ y1 o* [ called by procedure DO-PLOTS' {* ?& q9 v4 a' f
called by procedure SETUP
1 F$ D! R& W6 B+ o( w called by 按钮 'setup'5 q& d, A8 y0 u, H4 U
求大神解答啊 |