我编的程序如下turtles-own [energy]
8 `; P+ U/ p% t$ Hto setup- d1 S& V0 }, ~4 J
clear-all4 N5 M+ q0 u4 k8 d, n5 e* z0 c
setup-patches
3 U- L% s- H0 h. v create-turtles 1009 f; A0 S1 V' q
do-plots+ h( b$ `8 s6 ]
ask turtles [ setxy random-xcor random-ycor ]
8 ?( R( J+ N r3 \+ `5 _end1 C- g3 {, C( b/ t, b
to go5 {1 a$ h) A E* M t
move-turtles
6 ~- t8 u/ z; n N! T' n. S7 r5 Q eat-grass
1 a" Y o0 t7 t reproduce
4 g" {. Y2 |/ n4 A+ u0 z check-death3 |. V! q5 e, E2 A( E6 F2 S% x* `
regrow-grass2 X9 ]3 f# g+ g, ?- T6 t
do-plots2 p3 P4 H2 r x, G
end
4 w) q; u5 E) Dto move-turtles
0 K- V `5 J3 k# U' u' F' G ask turtles [1 `, }8 |( \( A& s' x" ]) C
right random 360+ ^0 s2 I& W6 V$ v
forward 1, P q0 k, E1 D4 ^1 F$ b, B" v
set energy energy - 1
; `0 c& v Z3 Z# r ]
! l9 P: ~( J! j' tend
1 C6 E# v! h$ |to setup-patches
) W: j3 b9 M+ w3 f$ v6 U1 }0 S$ | ask patches [ set pcolor green ]
0 t/ F5 a9 f4 jend
8 P1 l; [- a0 C: O) a0 _6 _to setup-turtles
" s0 B% O, `( s/ v3 f create-turtles 100% q" G7 c8 W/ f$ V7 s8 |% n* Q: k! G' x8 V
ask turtles [ setxy random-xcor random-ycor ]5 X' z, e* H/ _, @8 `" P5 x( u
end
1 q+ ?. v- e; c. s6 f6 ito eat-grass
) H4 @$ \" T) Q3 L( {3 h ask turtles [
2 |9 m: R, ]' z4 s if pcolor = green [
3 t* T& X) C* r6 {2 P set pcolor black
' D! _3 S5 f) _: R$ B0 g set energy (energy + 10)
. \5 O; O* E: Z ]
- e \" L- t2 d' S3 i ifelse show-energy?
4 }4 m3 P- M: } [ set label energy ]% A: i; d8 i$ v5 g# l1 Q
[ set label "" ]
$ Y0 R' F4 |! ? ]$ u+ e% ~3 N, n4 n
end
1 y# P# X: }8 g0 W4 M4 ato reproduce
9 a6 Z- D& x! H7 F ask turtles [
' s7 w& t I4 k' s$ b7 l. T5 w D if energy > 50 [
# o1 y7 q! @; Z/ ^ set energy energy - 50
7 `8 u7 g2 Q9 Q hatch 1 [ set energy 50 ]
) M7 C! K( X+ ^8 K+ g ] ]) V3 b$ ~/ @6 {9 _
]
\! m, ^/ p9 G- j: ?# Dend1 l$ }3 T6 F" g4 ?: C1 m2 p1 @
to check-death
2 ]- ^- B0 K8 Q3 H! C% x5 @ ask turtles [
0 Q5 H8 Y# T6 Z' \, c8 _; x if energy <= 0 [ die ]
- q- k2 ?! k o3 } ]! |! `; g2 p0 a0 ^) @- @
end
7 W5 C) Z4 z: p7 w/ mto regrow-grass
* A* p% {! ~) `7 N ask patches [7 d/ ^9 Y7 S+ f% M) F/ U
if random 100 < 3 [ set pcolor green ]+ O6 E+ y0 `6 v1 l- q# c
]8 d* O$ M Y/ v3 j" I
end# i6 j( y9 o+ }, ^8 m, d
to do-plots
1 r3 X8 V/ c* d5 i K/ O set-current-plot "Totals"
- z8 @2 p$ ?' Z- d/ K2 A8 p% ^* d: u set-current-plot-pen "turtles"4 n6 m: V7 V8 S/ A* _" S6 v* P
plot count turtles; a- x1 u0 R# a& h3 F
set-current-plot-pen "grass"
/ D" N0 D5 v2 H: z6 | H plot count patches with [pcolor = green]
+ [* X. q, _: Z5 Jend! X( B7 h. a$ C' j9 N
可是运行时提示no such plot: "Totals"
& z# M7 F: }* z% n5 S% Ierror while observer running SET-CURRENT-PLOT
/ i0 X* d' ]# l# U }6 ?! q4 k called by procedure DO-PLOTS/ q( q! D8 X: z1 v3 {
called by procedure SETUP
% u8 U$ q6 G; ]7 }2 U called by 按钮 'setup'" j0 ^7 W5 c- n; J5 q2 X5 {( n& f
求大神解答啊 |