我编的程序如下turtles-own [energy]
+ V% v0 F6 C2 G) {4 bto setup
" K4 `0 r# E* G( g* b5 a6 c clear-all
1 r9 }3 X: i$ \& _ setup-patches. U* ?$ D- H! b3 f
create-turtles 100
! }; N# i( q2 `1 i, m, {, v8 U do-plots
4 R$ m, a# t) A/ D8 t E4 f' g. r ask turtles [ setxy random-xcor random-ycor ]9 K6 l8 F* L# K$ L/ n) L
end
5 Y. a) f# b7 I& x" ^1 @# jto go: _/ _! y% u6 @; {
move-turtles( p- Y1 U- C: N$ c( U6 u
eat-grass
9 G* \% e/ R3 ]4 Q+ n- a. ? reproduce
) w# \% r& B# T* L check-death+ @& `; b. B0 ?
regrow-grass( e% N4 ~3 q+ l5 T# g
do-plots
0 K0 M2 Q7 i% L# Q O, V; J) Pend* f% |# A- J- F# g* }! ^( a' F
to move-turtles1 \* y" [) a E8 M- [
ask turtles [3 p; ^) D) i3 G
right random 360
. p* Z& f2 T" P0 N" `, a9 T2 c forward 1
8 E$ [: H) K' H9 L0 s; v set energy energy - 1
3 t1 V: A4 t& E) j4 n* Y3 w* t& Y ]5 H- W. @7 P; s$ t$ z
end8 i) T4 `$ Y1 @4 c; m$ p q
to setup-patches
+ \7 q7 \2 h5 ~! ~" T T ask patches [ set pcolor green ]
+ b. U* P' l# P, s" W. `end0 y2 H: ^3 S7 F' y9 d
to setup-turtles4 Q+ z3 w3 k/ J$ s% `4 H& d, o
create-turtles 100( j4 s+ j( v# I* l
ask turtles [ setxy random-xcor random-ycor ] z' S" z" n9 [2 X! O7 s8 { Y+ D
end, i; P b6 K. X
to eat-grass
' d6 q0 `4 T, p: ^ ask turtles [% \/ I8 g. g9 M( v
if pcolor = green [
/ q! K1 u# @5 F! X* E% U0 d set pcolor black$ Z2 F8 S) y1 r! K( [# y# [
set energy (energy + 10)
- U/ \; K \) ] ] `( _0 t; @# G$ A
ifelse show-energy?
8 x4 z" J, s, Y) W0 W [ set label energy ]
8 X$ Q7 s( i2 M e [ set label "" ]
* E' d) ]" c# g( H* u ]
" O, U! o; r+ F; Z; v! _end
% p0 g* [. J9 x) o& w ~to reproduce, Z2 W# ]# X. v+ X+ c0 u" x6 j* U
ask turtles [
b1 F& ^# D e; ^3 s+ a if energy > 50 [4 n/ `( L' |9 \; R0 ^/ L9 C
set energy energy - 507 {# f; x! N2 N. D) k
hatch 1 [ set energy 50 ]
: D& M+ h6 e, N1 e ], C2 W2 d+ @8 }# v# r
]. l/ W) Y4 N% ?+ ~; I# k) `$ @
end% q. K5 T' B% H) Y3 v, g2 o
to check-death, z8 o+ q; X3 y8 x' D9 F$ y: p1 f1 W
ask turtles [
! b8 E0 `2 y. Z7 s- a6 n if energy <= 0 [ die ]3 e; R, W" B f& b* a4 D& H$ A
]
* D7 A ^: M% yend9 b9 G8 \, r* m; n3 M7 _
to regrow-grass$ a, c0 x0 c/ j `' n3 r0 Z
ask patches [' t3 T E2 {0 |/ |) b/ f
if random 100 < 3 [ set pcolor green ]! a$ P0 x. ]& b
]* ^! K; S% [/ i7 D2 w
end
( g/ e1 V8 j8 Uto do-plots
9 V' f+ S8 s: A7 |6 N7 o4 I+ S set-current-plot "Totals"
8 V( t4 E8 h4 \9 E set-current-plot-pen "turtles"& }/ f1 F6 {- Z
plot count turtles1 v5 X; I6 h2 j4 c, P
set-current-plot-pen "grass"& I. W h1 T3 E+ A
plot count patches with [pcolor = green]
0 M& Y3 ?; v( S7 \, U+ ~% p0 h) yend
& Y' {- j% U1 p. g2 _: D$ @8 O- j可是运行时提示no such plot: "Totals"
8 L" ?2 x! p8 ?( e) Ferror while observer running SET-CURRENT-PLOT+ H3 A0 m- ^1 y4 R5 F0 `- S0 f
called by procedure DO-PLOTS
, i& O+ b0 P( b5 a V, M" B- d called by procedure SETUP
' B8 e) i; w2 T3 c) q+ _9 u, f" A- R5 F3 n called by 按钮 'setup'! [/ K$ }' ^* x* s
求大神解答啊 |