我编的程序如下turtles-own [energy]# u X! O- } W9 C, M1 {$ Q
to setup
5 E* l$ N3 P0 `- o# F& S" t clear-all* ~! j- Z2 C* t# i4 b$ B
setup-patches
9 Q1 g! z% x; d$ F7 F! ?4 T5 y, X create-turtles 100. ^& B) ~3 r. {9 c
do-plots
7 ~( Y9 ]1 O0 v ask turtles [ setxy random-xcor random-ycor ]
" B6 F0 R2 j0 h. _+ A/ lend
3 `7 \3 U# T. E) U6 Z8 a1 S( s: Oto go
8 S k9 O+ I) I( `, I7 [* M# a7 o move-turtles7 \; R2 A r; ]% a- v5 `
eat-grass
4 A7 {1 M, X# `: e, N! K/ S reproduce5 x7 ?9 {7 i5 T2 C
check-death# U! j# T; d! V3 ~; {$ {6 H$ H- E8 p
regrow-grass* u9 d0 |, i* r3 U5 T& i
do-plots; a! [ G; O) b9 g/ P9 Y/ }" K) _
end
; k" s8 f/ f/ n( m0 `" E* kto move-turtles. }' W3 F" S6 q
ask turtles [
o1 T t' X8 P right random 360& \! s' k: G3 R$ R0 z6 H8 w+ E. J
forward 1
$ J; x! n/ r0 P+ I1 _, v set energy energy - 1 H2 {, ]5 F! G
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end* r! c: Z7 h) b, M' s& \
to setup-patches8 Y# [) h, }' _( \3 R) M1 j6 S5 A) P3 _5 a
ask patches [ set pcolor green ]
9 f( K! B- {! @4 d) x6 z" ~end
- L. r% l; l8 I# R! W7 ]" P4 X) kto setup-turtles
" B$ |3 v( T8 M0 X create-turtles 100" F; ?4 t* A% r0 J
ask turtles [ setxy random-xcor random-ycor ]
: j$ s- o% N& p# s+ \end
# F W& X9 p( k1 p& z( {3 s: N Jto eat-grass
8 z7 s4 ~0 H- f) e* W7 e9 B# o ask turtles [9 q# ?& R7 W! K4 k
if pcolor = green [
* v1 r q4 J& M+ @+ H$ J set pcolor black
7 d) ]* y/ l& H. Q. }' V set energy (energy + 10)
* k) Z& o# v% e+ D, X ]2 ]& s/ y7 u) i3 } }$ O- H
ifelse show-energy?
8 M$ F' H+ r7 g9 b8 i) r8 x/ p1 ? [ set label energy ]* f$ V9 t$ n7 e* g% K+ [' L; ?
[ set label "" ]
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end. ^7 B2 q2 l+ ]
to reproduce
: B$ p$ j4 Y! J8 C8 u: A. ~ ask turtles [
# L: L' M; f' N+ ~$ \ if energy > 50 [) n% j3 R! i1 x4 T6 |& v' c
set energy energy - 50
7 u$ d. L6 {8 z4 o3 N0 g* B hatch 1 [ set energy 50 ]
6 F5 W- M; q5 j. H. t# n ]
- c0 i; E7 x& B0 q; F/ U( P, t( H ]
9 k2 e* {0 }# ]0 eend
% f2 Q$ F& O, O! f5 E; Bto check-death
6 O! _6 u) t, n3 g8 K ask turtles [
4 J& k0 V' s( p2 T! | if energy <= 0 [ die ]
" ]5 j* Y; k Q- n4 f' \, S+ o. Q ]+ s0 }! I* ]$ o- {
end( I k% ]2 L3 c3 d4 S, c& r
to regrow-grass3 T( Z% v; T; F9 E$ Y* ?4 L9 K
ask patches [" L8 ~0 t4 G7 z6 g, h! i
if random 100 < 3 [ set pcolor green ]
7 `. l6 q4 ]& b ]
5 w1 H3 O; \( h8 yend- O% ^# D. Q2 k% K
to do-plots* X7 Q9 v. B* y0 O0 g; d5 Q
set-current-plot "Totals"
9 A" b% P Y9 N8 O3 f set-current-plot-pen "turtles"
\; u, m! n* t; b plot count turtles! d- s ]' o* k# c
set-current-plot-pen "grass"
/ Y# Y2 f- t# b( J5 x; Q/ k plot count patches with [pcolor = green]
! G$ ?6 G1 c2 R) S& Uend
8 k, ~- E& V {可是运行时提示no such plot: "Totals": ]1 d. D7 J; S+ k; K
error while observer running SET-CURRENT-PLOT
: j4 t$ e9 Y$ k" H { called by procedure DO-PLOTS
" l+ S: Z' T$ b4 _1 r called by procedure SETUP3 S8 D8 q( L) P/ f) t( a, W; y
called by 按钮 'setup'8 d1 O- @1 r% G. E
求大神解答啊 |