我编的程序如下turtles-own [energy]
& V- i1 H& e& b# W0 x4 X9 Q# mto setup" E4 i* D: q+ {- N5 a
clear-all
5 _5 c5 F% p( M8 G setup-patches% u. N' O+ v4 W7 G* T) I( R
create-turtles 100
) v2 e4 ~4 _! Z K do-plots
& p4 F! d* f/ P/ k ask turtles [ setxy random-xcor random-ycor ]* x- h1 J$ t5 f$ s3 L
end
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move-turtles& s8 Y# C6 Z" H6 U" ^+ O/ U' F
eat-grass
5 s5 n! w3 @4 n& X" w: R- y2 A& f- h+ n reproduce& ?, o% p0 _6 G6 ?
check-death
$ c: N7 j9 p: s- Y) j6 z regrow-grass
4 J: h9 y' @ n8 b1 r do-plots5 u8 I* c7 k9 e2 ? B, c
end- n7 M, @' \5 y7 V f! U2 j
to move-turtles: N6 Y* ^: t1 r' _. C! S
ask turtles [
6 z; Y) a' b: g2 ? right random 3608 B- [' M* T8 n5 f) H' v
forward 1
+ L: s R5 {( P1 [ set energy energy - 1, t' d5 u9 w: o
]
4 X6 B$ W+ m" s K/ aend; A3 [" k' ]2 e7 }% m7 ~" V$ B, w3 `
to setup-patches2 M/ I* P2 _2 o+ w7 F9 \; P# T8 h
ask patches [ set pcolor green ]
: \3 R+ D0 `! d! Cend
/ y) D/ k% H- k" yto setup-turtles
8 q# R8 L( U5 L. B; r3 e) y create-turtles 100
5 E; M- B5 W+ p$ w3 m X1 c7 i6 Y ask turtles [ setxy random-xcor random-ycor ]
+ w% \8 u" Y* @( Aend
: p- d0 _) @, qto eat-grass
, b7 U# E8 z5 _% a# a0 { ask turtles [
1 I4 X( s$ O |. I% @3 w if pcolor = green [! b8 w+ @, u6 i- h" x" M
set pcolor black$ y6 }+ L$ Y' |6 U* f. ^; a
set energy (energy + 10)1 S- e9 i' [" n( i/ L+ {) ^6 f
]: p2 j- h3 d/ Y$ M" k
ifelse show-energy?
$ C3 G+ v& T' p# U [ set label energy ]
+ z3 @/ V1 |/ ~# r [ set label "" ] Z& a+ o3 A5 m$ G
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end, v0 L7 G8 f& c. y; F0 Z$ ?, V- H
to reproduce! |0 u- O* O4 T+ ?
ask turtles [/ l& I/ ?* T6 R) C. E) E
if energy > 50 [- }" U/ j \9 M( p4 }& D0 f
set energy energy - 50
' Y! X) v2 d( z8 u hatch 1 [ set energy 50 ]
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end4 k! i+ f. M" g8 w( h8 L* b
to check-death4 f4 h1 \( x3 A$ v! z* k+ M
ask turtles [) `5 p6 i8 h- o7 h. W' v: k+ U
if energy <= 0 [ die ]
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) V0 j$ x) D- K& w O6 Yend, D: h _ b& j4 z8 z, D, B
to regrow-grass
G7 t& B. p# ?, L7 a/ o: a ask patches [
: H1 u5 w" @/ D' T* y if random 100 < 3 [ set pcolor green ]) N/ h9 J; [$ @3 v5 i5 p
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end
6 n, w8 ?* Q1 s- h$ ?0 zto do-plots. ^& o: D/ E; I4 }: s. Z1 Q
set-current-plot "Totals"
* H# \4 R) R- L( r( E. N4 C set-current-plot-pen "turtles"
0 ]$ s. \2 @% B9 h plot count turtles+ P0 Q: H7 Q; Q% v
set-current-plot-pen "grass"
0 N+ d& o0 @9 T plot count patches with [pcolor = green]
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可是运行时提示no such plot: "Totals"
' I( o o3 A! r- W/ Eerror while observer running SET-CURRENT-PLOT$ S" K4 G9 {* L" l
called by procedure DO-PLOTS
% c5 ?0 B6 L, z1 K5 C3 w/ P called by procedure SETUP
+ U2 \' x" i8 ~" `/ U called by 按钮 'setup'
_: M' b. w1 s$ v* E求大神解答啊 |