我编的程序如下turtles-own [energy]
9 s6 ^" z7 E, F7 Oto setup
! ^5 L. y" H, |6 d$ @ clear-all
( ? W. y" k3 Z# d; p- z0 L2 ~ setup-patches
/ y( d* i+ Q% t& [$ } create-turtles 100
3 j1 N* j& B7 h! l do-plots
+ }7 a: y8 B+ J$ V! D- A3 p! e0 U7 k ask turtles [ setxy random-xcor random-ycor ]: X" A4 ~+ Z/ ~
end1 ^5 e& P( Q# Y+ G7 P
to go% Z. F% a7 ]" Q5 D! M
move-turtles V7 e( }$ D8 M* W* ^
eat-grass
* T, S& k+ L! V: _4 Z5 c( p reproduce
; I* r" n4 L+ X check-death' f! `- p4 r- x5 F8 ?" ]
regrow-grass: Y/ P0 {; R& P
do-plots m) n. \' b: p& X" c% d
end( O' c# I9 x1 ~ Q0 x# a6 [/ J
to move-turtles
2 f3 ?& `, Z) W: D ask turtles [: O8 d$ d# K0 s: e
right random 360
' O$ \9 O/ B A7 m X forward 1
+ _! h: A6 p7 T6 J* E% I+ S set energy energy - 1
8 F% Z3 _2 T. E2 a ]
+ k) a! v8 h) b" M1 h) |! |end
1 f( |6 e6 R* \; k$ tto setup-patches( M5 Y4 D1 T6 _' H% c& z! [ q- K
ask patches [ set pcolor green ]1 @. j+ ~9 p$ }1 W+ R/ o; h! b
end
' ~& k+ t6 a s+ U: o2 j6 ^to setup-turtles
/ V. P4 _! {+ G2 M' t" W- ~ create-turtles 1001 s, Y, k1 \$ U6 ^6 I
ask turtles [ setxy random-xcor random-ycor ]) @ f; D6 m* J+ x
end
( i' v/ y7 b" a3 Q8 N7 _; ?to eat-grass
+ v! I/ Z$ w- a, o6 S& J ask turtles [9 Y4 P& y) O" X* O* j6 f' s; \, O
if pcolor = green [
- W* k8 C3 f# U* `5 C set pcolor black/ d# p$ s% S/ L# Q4 P8 T
set energy (energy + 10)1 b0 z7 g- p4 {" S5 K9 b
]; y" @8 e$ Z0 q) |' p
ifelse show-energy?
% q" E ?" n3 h( i( u [ set label energy ]
s. g+ M3 k0 }. j [ set label "" ]$ V! L3 F5 r' a2 ?' u' j
]
9 ?- k$ I4 @4 }- `end* p+ l1 ?) X+ ?; C4 B9 M
to reproduce
o5 |2 X4 @8 P2 x Q ask turtles [
" k0 g. b# U4 k( T3 l if energy > 50 [
( T+ h: U- A8 ^3 ^5 W- H4 c set energy energy - 50$ |5 x# @. }" B6 j
hatch 1 [ set energy 50 ]
$ o+ y0 z7 s& O ]; f0 u8 L1 x: T4 P
]' q# F3 U7 V! k. M5 ?4 m7 ?
end( F( g5 O- A# k. j2 [
to check-death$ I V7 ?1 E6 y e
ask turtles [% `6 R6 N5 N4 \- W) z' m% `: g
if energy <= 0 [ die ]
$ j" x8 L, \) @2 [, d8 ^) N ] m9 \% f0 `7 O# B6 r/ c0 [
end
$ y% T7 C2 L0 S$ X; }5 V6 K9 rto regrow-grass
" w6 D: W. o( f& q7 l ask patches [
1 I. }. N2 W# d, }+ _ V: N- ? if random 100 < 3 [ set pcolor green ]$ U& ?5 Z- q5 c1 x& d
]
& j; h% D9 S/ L) B- p6 Pend
6 c" f: t+ G' Y! M, jto do-plots
0 y# j c: C& J; S3 G set-current-plot "Totals"
& x: A% m i8 { x set-current-plot-pen "turtles"
* u3 w+ I" `( }; ~& M _9 r$ ] plot count turtles: F1 b# {4 R @
set-current-plot-pen "grass"- z2 A/ M0 f5 z$ X/ o# m! O; B& r
plot count patches with [pcolor = green]& {! q* M! Z! f0 _0 [; f
end7 w }6 Y( b: M9 ^* T
可是运行时提示no such plot: "Totals"
2 Z! ?' |4 l" |; @5 Berror while observer running SET-CURRENT-PLOT
! H$ G2 x g8 H5 Y' Y% t0 M; F called by procedure DO-PLOTS
! H( q4 a4 K7 P/ A called by procedure SETUP; ]$ q2 F k' ~7 U( d( b5 N2 I. {
called by 按钮 'setup'. F$ G& \% o! h& p! @' m
求大神解答啊 |