我编的程序如下turtles-own [energy]+ U0 l% j7 x/ P- j' A# J
to setup
% |- |* z9 W' L5 f- W. C& S0 _ clear-all% b8 t, {, ` ] R& S( p# L- W
setup-patches! K% A: k2 |6 U6 @
create-turtles 100
1 U1 k: [6 p+ A( @ do-plots f" q0 r( |8 R* \
ask turtles [ setxy random-xcor random-ycor ]7 k6 C4 R3 A' }$ f" o, [( v! p( ^# J
end2 v( j- G T5 x( d
to go
* V. I6 s$ k9 ]3 H move-turtles
; _ c$ [! P2 g8 a9 E eat-grass! x0 z& d# P2 s* ?1 m6 V1 Y
reproduce# g, Z1 b7 p% l6 u" E/ u# b
check-death. c0 u9 \( q( R
regrow-grass
: J& b' R/ g) v: J( `' w do-plots
) p# R7 J5 V/ s7 K M( C5 Qend
, {6 p/ i3 f6 bto move-turtles
) g: X7 H. _8 S6 C ask turtles [
, k3 I g8 n4 |5 ]- M; `& M right random 360
3 H2 H/ Z+ D6 f0 }0 a! d0 B6 W forward 16 R1 y: L% @ q( F
set energy energy - 1$ L( L0 d s5 ]+ n
]
2 t3 ~9 x5 w, K+ Gend
4 C9 u& z4 P( V# f/ `1 @# Qto setup-patches
; N1 D# I i" x0 K( u- V. e+ V. O ask patches [ set pcolor green ]
& z/ y# O$ ?. `9 K: }+ bend
& `6 A2 |" `9 J" @. l* Kto setup-turtles6 ]# K( P9 U1 I) k: e
create-turtles 100
6 h3 S: ^# }* R7 b ask turtles [ setxy random-xcor random-ycor ]6 _% G% I% f" B
end
/ x/ }7 k" E% q, u9 u9 ]to eat-grass M Z! h; l: C. R' r& x% R
ask turtles [
0 W, _7 B2 v" [ if pcolor = green [
, p! h2 t, b) d! c set pcolor black* n* C' @" f5 f9 h, m
set energy (energy + 10)
' \6 O0 k% v0 D3 V2 H7 _ ]3 H& C5 f. ~1 g! j/ k9 h8 {
ifelse show-energy?/ K' C* [: c- j3 A6 ?' z/ S
[ set label energy ]
V1 p# x. q; ]5 A* ?9 h! z [ set label "" ]
' Z+ Q4 G `, s& e; v9 }' X0 m" G# D ]
5 A2 O3 z+ v( y2 }0 V) e% [' vend
E2 p2 H$ f* y) P3 ito reproduce
) a# w5 l' j8 L ask turtles [
- i$ v ` W( Z. \: Z if energy > 50 [' D5 }& P) @! W/ [; l
set energy energy - 50
1 u) M4 N$ Y+ G) F hatch 1 [ set energy 50 ]5 A! y- X6 I: ~, ~
]/ D7 [- E) ]& P: _7 x. \: U F
]
4 C6 m0 r# M; z0 J/ Wend/ l( p1 G1 I1 B$ P; T; P
to check-death/ [4 q5 m. o+ A8 \
ask turtles [
; i3 g, R! U0 W# }' t if energy <= 0 [ die ]
% x& }; @1 Y9 J ]
% D" M0 p7 b+ p) V! ?: [) r5 ]end
9 n; K* y1 H U" z0 pto regrow-grass
! o u7 k4 i$ R3 f) C ask patches [
0 s% v0 m4 j; \7 V7 [( y if random 100 < 3 [ set pcolor green ]% x) u( g% b3 p* l7 h
]
0 d2 p$ g: V7 v( d9 k+ rend
2 J, G8 D+ ^) `. U- Qto do-plots" H& A0 i1 {2 P+ m1 J
set-current-plot "Totals"7 E4 a" q/ h" S4 B9 M# j
set-current-plot-pen "turtles"0 w6 S' k; l' @0 {2 E% r: a
plot count turtles1 \3 s" b$ w- v) T* v# x7 s9 r/ I
set-current-plot-pen "grass"" Z/ D+ G+ b& _9 n$ S9 ^% K
plot count patches with [pcolor = green]
" F( U# Q, J) Cend) h! H9 h8 g9 v
可是运行时提示no such plot: "Totals"
6 }, o7 r9 Q" ~* k+ u: m$ {; Xerror while observer running SET-CURRENT-PLOT
8 I. {: p3 \3 l' P4 X called by procedure DO-PLOTS
+ ^0 T, G1 D" S8 q3 _# ^" z$ Z called by procedure SETUP
1 o* a0 _$ t& n( R" W called by 按钮 'setup'$ e/ ~3 y' ^- |2 S! }3 x
求大神解答啊 |