我编的程序如下turtles-own [energy]* `& n4 L3 O# c/ n' z7 Q3 n+ S
to setup3 U9 k3 k# K5 F
clear-all
, C1 m" G2 ]9 v5 }! v setup-patches
) d9 A9 L6 j) ^: H. v5 ~7 | create-turtles 100: [/ e& i# @7 j6 b/ [$ ?& b
do-plots
. E: d0 {8 t, @# E" f8 v9 j ask turtles [ setxy random-xcor random-ycor ]( H" p+ j% f7 U2 B9 O
end% f. F4 K2 }% I! x4 s5 }3 p
to go
+ d; n5 ?% v. i move-turtles
0 W. x/ ?: P R: G eat-grass
; M! z, N2 [1 F% j( ` reproduce
+ ?2 R( z. s' r x check-death3 Z/ P ~! W( b
regrow-grass' \+ }6 p0 b j4 }
do-plots
6 ~/ A8 z0 v: w+ I. A! D7 v; o Mend
$ l6 ?4 r5 L2 b; pto move-turtles
) v# k$ g/ _, {6 x& j ask turtles [
. T9 R! A4 B% y/ ?1 h. k right random 360
. r4 p# F7 v( l. z forward 1
" S4 y$ F( C& I" }5 f, I set energy energy - 1
& J" R0 U+ i+ N' V: e# ? ]
+ ~ X, x- F gend" V; w. x+ F1 \( r2 ~ h
to setup-patches& i. U5 i5 u7 ?
ask patches [ set pcolor green ]; @& C5 y1 M! V$ f a' c6 A% J$ ~
end: A3 s F3 l" g7 {) v9 b e
to setup-turtles
( s# C" ~/ Y! H+ J5 P create-turtles 100 k1 [6 D5 d' C X
ask turtles [ setxy random-xcor random-ycor ]. R0 _5 w! L, m# e; [
end
% l$ e7 f: Z$ n8 d% Wto eat-grass. z0 ]* y. ], |% J
ask turtles [
" t n# g6 \$ I# n# Y if pcolor = green [
1 B1 b$ Z: i& R set pcolor black
' \9 \4 k1 d8 r: W! i& `6 h1 W set energy (energy + 10)
* D4 d! O2 F; c' e' W, V0 t" B ]: P6 I7 _) A# p: L Y
ifelse show-energy?
0 q# W9 m c+ ^' n5 T" O' A [ set label energy ]
! W5 Q% X+ z4 }0 j N [ set label "" ]3 z6 B$ t; U! N- m
]
" P4 { F9 I5 @6 n8 n# bend
9 g9 s7 c7 ?' X; u) [to reproduce( U( S/ g% @$ o. C2 W3 j$ r
ask turtles [
w7 P* @2 n! {6 e1 r4 n if energy > 50 [
6 r4 \6 w# n& j/ c$ Z: z& Q set energy energy - 50
8 L, X6 |" ^, J1 C hatch 1 [ set energy 50 ] E0 c) j+ w; x9 i- t; a
]
( Y1 p: A! c' B- J; r ]
, m. U \) v6 p8 I' Bend
. L. W* i- c2 M/ \( F! ]& eto check-death
3 D: Q" Z E& @) L! x b" Z5 ~ ask turtles [* C6 c* N. A. [& M# B% Y: w* Y
if energy <= 0 [ die ]
5 r0 `& T/ R. O t c& @ ]7 Q7 t2 t4 ?% b
end- L% g5 ~0 [. C* m$ G
to regrow-grass
4 T$ [2 x; M% ^" A* ` ask patches [
7 p6 ?/ `3 ^3 k0 y if random 100 < 3 [ set pcolor green ]
) g8 _2 `1 f1 S! ?- {9 d/ s2 D ]. z) C+ Y \( [( ]
end
4 X7 a7 r& `' Y+ k' i5 P% X# Bto do-plots5 Q; m/ b j0 C3 }' P1 J( {
set-current-plot "Totals"
9 D1 n% t2 {1 F2 q/ i- r9 C* } set-current-plot-pen "turtles"
3 W+ g; V6 X- B' ?& A/ I6 B plot count turtles
# B1 m& @- |& \ set-current-plot-pen "grass"
7 K5 v# e- M3 @+ A y0 F" U: U5 `( i plot count patches with [pcolor = green]( r% k6 ` |' g
end* S4 i: S5 b+ D4 Y" w
可是运行时提示no such plot: "Totals"
* |! T1 u# T; u/ j: g9 d7 x' k" berror while observer running SET-CURRENT-PLOT
8 H# l% D+ t4 @5 D* j& s called by procedure DO-PLOTS+ [; A( K: ?3 V+ D
called by procedure SETUP
8 ^/ o2 @. u2 [ called by 按钮 'setup'2 n! o: n! @/ \& ], c
求大神解答啊 |