我编的程序如下turtles-own [energy]7 w6 k. n/ O6 ^$ N0 {; B# N \
to setup+ c: o0 ^$ f0 x( V
clear-all
9 ?/ N" t3 L _& F8 n. o setup-patches0 c& `2 N4 ^; n' W5 G3 y
create-turtles 100
( ~+ {4 I6 x6 P, q% c7 W do-plots8 A A9 L3 g7 ^4 C4 `# O3 d' d* v
ask turtles [ setxy random-xcor random-ycor ]
- L4 ~8 s7 J2 c& D5 h/ j# oend
$ Z8 ^# t* n2 g6 E0 m2 gto go) P/ t* ^2 l1 y
move-turtles4 A+ F6 c$ W, p: Z7 q7 q. P
eat-grass3 f( N% `: M* ?) }4 Y
reproduce1 }9 n' E& f! }
check-death$ y8 V5 G2 P* N: W1 `' p
regrow-grass& |/ X( G" h# |' L I0 y
do-plots
" L8 t: B& e1 r l- Jend
- A: a: k$ ], z# ]: |) H: L" hto move-turtles4 `' @' L4 Z+ m- E* X7 ?0 a+ T
ask turtles [; l5 K" ~ j0 f# R6 V% _
right random 360! c$ Y T0 z; |; {
forward 1; ]$ f8 {+ |( w$ Q
set energy energy - 1( G* F$ M. O2 a* i4 F1 `
]
+ ^7 R5 l1 s" Z9 ~, ~4 _% Rend
+ v' F: _! O) |5 f- ~to setup-patches
i& s6 k% V9 C1 l ask patches [ set pcolor green ]- m4 f8 B2 q) T3 @2 [0 Q
end8 Z, k" ^: J- @; _* @
to setup-turtles& B6 C- y! N F2 L8 |1 _
create-turtles 1008 c+ z! `2 a2 u- p C5 O2 ] m
ask turtles [ setxy random-xcor random-ycor ]- w& K& o* C {9 }( f
end5 M- H6 W8 r1 Q% w
to eat-grass) h, U* C" C& }# O$ |: T7 _" G
ask turtles [
_7 K) X) Z. e if pcolor = green [
1 X5 d+ Z$ t' A6 K: N2 J6 k set pcolor black, U' X5 c6 `6 `& p x
set energy (energy + 10)) i: \7 \( V% K3 M
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ifelse show-energy?
* ]2 D( g3 P; | [ set label energy ]3 H; w& v6 m. F* B
[ set label "" ]
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end
3 Y" @9 x' Q+ u9 D0 J" x# uto reproduce& x& u6 P6 H4 [* \
ask turtles [
" w" O: K9 \4 ~2 E# K6 u6 T if energy > 50 [8 c( x1 v; Q; c
set energy energy - 50
. ~, ?+ z& J, G% F7 x+ G hatch 1 [ set energy 50 ]" @# d, c* G$ X- }3 f4 Q/ Z
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end
. ~0 U& S+ A! f8 \" G! Gto check-death# V* a6 `! }, t, r8 Z
ask turtles [& z3 G( N/ Z, |: `" [) ^- {) N. v
if energy <= 0 [ die ]
7 ]2 k% Z' h$ m) p: x% S' e ]
: b0 C" F5 a, H; D/ X1 Tend
& V) Z$ U. y5 Q9 a( Q. a- `to regrow-grass
* f2 F3 \5 P; ~, P6 h0 U+ X4 @ ask patches [
. o9 T! v2 \& V& p if random 100 < 3 [ set pcolor green ]* C3 ~& Y' \' {. X
]" U+ W) k7 T) z/ o/ O3 D; h
end
3 H' [9 \' i# X; K9 {4 [8 Lto do-plots2 f7 ]# g4 c, T% v5 _: S
set-current-plot "Totals"
! f$ L+ a, J& u set-current-plot-pen "turtles": e8 N, U% K: O* O
plot count turtles
$ J8 ^ ^" F4 j5 J! Y; ] ]& Q0 W set-current-plot-pen "grass"2 q$ X* h9 a3 d
plot count patches with [pcolor = green]* }. X5 Q) w+ b' Z9 z/ |
end+ f+ b+ F! e; A8 E
可是运行时提示no such plot: "Totals"! `, |+ j) b2 R) I& z7 D
error while observer running SET-CURRENT-PLOT
6 r% D# }, c! g1 O% [9 L called by procedure DO-PLOTS
8 Y$ d/ g* G# z" X5 f" ` Z called by procedure SETUP d4 u+ u6 S/ [# J! d
called by 按钮 'setup'
% Y7 {6 v+ U# e: J4 P/ d$ _求大神解答啊 |