我编的程序如下turtles-own [energy]
" `3 |; L0 t) X! e, ?to setup& h9 z$ W4 b, D( J; C8 p) e
clear-all
; K. J2 e& ~: t" Z, c setup-patches
0 f! Y( ^& G1 j9 | g6 y) q6 E5 E3 Y create-turtles 100# O* ?. R& H- ?3 G+ W
do-plots
7 |1 Q9 J% W7 k# v; L" s# C ask turtles [ setxy random-xcor random-ycor ]. D8 I3 l) `, `4 T
end
7 V' }1 q# ]& `9 F! q' H1 sto go& @( [ n {4 Z. C
move-turtles
1 A7 A4 H4 F! t( L( Y1 S eat-grass
" a6 M- b' c& M/ m5 G reproduce
* x' C7 O8 I; S check-death
# K& B2 V, m W8 V- P9 t regrow-grass" N, `( f$ f9 d- A
do-plots
$ H/ r+ c5 L. }* w% q, V( fend
1 K- S, Q) v0 r; P! T+ [to move-turtles% |4 i' B1 r7 _) I! b+ c
ask turtles [
5 \* i* t: q- H- E! d: q! [, q' P4 ^ right random 360' @) c q P$ t
forward 1
) n5 o! }4 x' x) F0 y* A2 ]0 l set energy energy - 1
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$ Z8 }. k4 M. x5 }end" ^5 `' d/ u2 b' v# g( [
to setup-patches
2 K1 l3 e; j0 V* L, D1 A U) a6 J* { ask patches [ set pcolor green ]
9 `8 S/ c) m% T2 Bend
" j! N5 B4 x' ?0 w0 H$ I+ Qto setup-turtles
0 y) D3 B# d+ }3 l create-turtles 100) x1 F4 M; D! k. j
ask turtles [ setxy random-xcor random-ycor ]
( o/ T6 W+ z+ w5 `" U& _; y! Hend
* n1 c, R; X! f$ [5 P" ?$ B0 W% ]to eat-grass
+ U# B( ~4 f. ^0 ~ ask turtles [# h8 a% U3 G% G8 w. a$ P
if pcolor = green [0 h+ L5 Q" `7 |% C9 b) _
set pcolor black! v+ p' C3 G7 h) d* {& g
set energy (energy + 10)
?3 l; ~+ S+ Q9 b' @ ]
' ^# W9 t! k9 ~# m4 G ifelse show-energy?. s. F3 v5 J3 x' L8 T7 H
[ set label energy ] m q% M3 k/ c+ A: N% N
[ set label "" ]
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end
% k, I2 R# y9 J3 Z) t1 i$ S/ l+ x- ^to reproduce
$ d. |- K. @4 H" a/ `9 o3 |$ K; z ask turtles [$ n6 j ~- v4 i- I3 ]6 b2 C
if energy > 50 [
7 J, l9 ?8 j! |$ w7 _ set energy energy - 50
* C5 n3 \6 \5 j6 s hatch 1 [ set energy 50 ]" g4 g$ J& X3 q, X* u
]! E" k: w. ]0 v9 n" H
]
* l7 m: ~) i$ \' Yend
* q) B$ C$ ]" r [# a% h; Pto check-death
, c5 `, a% J7 N' R7 h! p+ n ask turtles [
8 k3 a6 S: `7 i( ~7 E if energy <= 0 [ die ]! ^( S# W% K9 _5 x" V
]
, Z. g$ E% |9 s/ Tend0 @9 X& R: h. e* N/ ]4 o
to regrow-grass
0 F! t- z% U7 z( E1 i7 H( ~3 X ask patches [2 h8 E- ?1 \, |8 V; W: X2 D, e
if random 100 < 3 [ set pcolor green ]$ `# v+ o% A' u
]
' F$ }6 O, D Jend
4 R' k( X `, O7 g! ~: o4 R9 Bto do-plots8 U* z4 A& L+ T
set-current-plot "Totals"# {" [" _5 d+ k1 q
set-current-plot-pen "turtles"
+ q0 m8 n1 O) u plot count turtles
4 H& e. [& s y" e+ i$ \ p+ v# j4 }! N set-current-plot-pen "grass"
, p5 ?* V7 ]9 n/ [ plot count patches with [pcolor = green]4 i/ ^3 G- [3 c7 n. ?2 p
end
) L5 D8 p9 _# F, \0 |, D0 U4 h% x可是运行时提示no such plot: "Totals"# G3 Z2 R7 n; H7 d! P! y) G& {, J
error while observer running SET-CURRENT-PLOT+ E0 s6 \7 Q- W8 g- {
called by procedure DO-PLOTS
& t/ {" h' K3 p) g called by procedure SETUP0 m# p k+ O! U, [6 ?
called by 按钮 'setup'4 Z1 U1 {! c/ A) n9 r
求大神解答啊 |