我编的程序如下turtles-own [energy]) O0 k4 |7 _& K
to setup. j' W9 ], h* `9 Z8 l" G9 B1 H
clear-all# `3 d- n6 U( e. Q# ~: @; D" ^
setup-patches
' M# A& W* I8 I/ G create-turtles 100
. @5 s" b$ ]4 y, } do-plots
8 w" D6 a$ w! F$ w3 y, X ask turtles [ setxy random-xcor random-ycor ]) `. [. ^3 N7 v/ [
end+ a- |( b4 O% h/ ^
to go; h% I- B( \' f, X$ j& @3 r
move-turtles! k9 x5 C, |2 X
eat-grass
+ ^% E/ c9 W6 M, k, o reproduce
/ d9 }$ {$ e' R1 x& d check-death
5 v1 j( m: @8 |7 T regrow-grass
1 F3 r9 r& F i3 x z8 ? do-plots K# u# E. `8 T0 W r0 h* T0 u" n. q
end" E7 y7 y2 R# g
to move-turtles% o9 @+ B" A/ _" F7 A. u
ask turtles [0 @% j, d0 U9 [% b* [& i
right random 360) F! T* e1 {! b
forward 14 \* U5 b+ Q$ G9 n9 v# S
set energy energy - 1+ w4 b2 A1 j$ r! B
]
* F- Z4 ]2 `! R8 } ~end
$ e& D5 G! ~4 S0 L+ W: p) fto setup-patches
3 D8 `: G0 L! y, ^ ask patches [ set pcolor green ]+ I F2 @$ n4 \+ ]" B
end) ], W' H! f5 q% S2 j
to setup-turtles
) x# z5 f# u. f! H# m( L- u, J" l* a create-turtles 1005 R" M, _. ~) ]2 F& h( s" e
ask turtles [ setxy random-xcor random-ycor ]
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to eat-grass
$ [% Q+ S7 C6 o! ]/ q3 K y ask turtles [
& Q. J5 I% h0 s if pcolor = green [
, }4 m7 j0 d$ E set pcolor black" k( n9 k8 I H6 _/ w, Y+ z# w
set energy (energy + 10)/ E% W8 p, z) U- f' \9 {$ m
]
- F# v8 N- `4 D2 \. w5 G ifelse show-energy?9 U% C% x8 j# U, ?2 W$ u
[ set label energy ]
! T4 G* }+ F ]; W [ set label "" ]0 L9 [3 {- f# `* B+ N7 f
]
. a% Z2 m5 A: c3 _: j! P% S) S0 dend
8 N! g( D9 {5 O1 Bto reproduce7 a( u) b/ j7 x! [* ]% ~& Q6 ?& W/ o
ask turtles [# d% H, J' R- c: e6 q$ N
if energy > 50 [
) W0 e/ E9 X1 f* K* y set energy energy - 50
7 x9 L0 |- d5 _7 G hatch 1 [ set energy 50 ]
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end
; C2 r6 M) B; J: r! ~! b$ Y! _to check-death* l; I' ? c8 m" p8 `+ E5 S" U3 P
ask turtles [
: V2 o7 e4 O' }$ E6 z8 z if energy <= 0 [ die ]
# S, k& J3 L, K' t# o! W# {' A w+ Y ]
/ A4 k3 y* {' f" C5 S) k; f6 ~, cend0 p0 O, W$ G3 i' x
to regrow-grass
% Z# L4 x3 p: [' w. p ask patches [4 X& A% d/ h, L* L, R
if random 100 < 3 [ set pcolor green ]
` @- y1 f: @( v0 n, |* N ]
$ {% N! ~& A. h& Tend. k# v9 X1 H/ [$ h( ^! ^
to do-plots
1 T0 i/ n M, E. ~7 Y/ R set-current-plot "Totals"
7 y1 D4 Q) [/ F set-current-plot-pen "turtles"4 v: k8 `& T. M# [+ G
plot count turtles! c9 n7 o4 J2 l; Y9 Z& v: a
set-current-plot-pen "grass"
, r* [1 s- L% {) y) ^& a% ` plot count patches with [pcolor = green]
( s9 y$ F! u( Z' V- G9 Rend5 K1 b. o( y2 I% I9 `
可是运行时提示no such plot: "Totals"; E- j3 G3 ]9 Q/ V u
error while observer running SET-CURRENT-PLOT- Y& e1 Y- O$ a/ r; N$ E: I
called by procedure DO-PLOTS
+ k' i! o( A4 w- B0 c# u! Z9 M called by procedure SETUP5 r0 b6 w, T6 K: g6 K
called by 按钮 'setup'
5 b" l4 t/ V7 Y' a求大神解答啊 |