我编的程序如下turtles-own [energy]) _: r/ I8 A9 N" Q- H2 S
to setup, l! j" ?0 m- n9 |
clear-all
- {! `; o4 U7 |" h- j* |2 d setup-patches+ M/ C3 W; ~7 H+ U
create-turtles 100
" ]' M" v( O" z; t7 [& D N do-plots
. [. }6 c$ @4 Y* _# C ask turtles [ setxy random-xcor random-ycor ]
1 \- t" h' E4 I/ }end
# v I' K* G8 \$ V, cto go1 U) x( \3 l! r' U9 g
move-turtles
8 ?! z7 V R+ ?, v. b3 K eat-grass
7 c" A- y6 R0 D4 G reproduce
2 v3 M3 d7 f$ l* e check-death
9 X# m' B1 \" W& { regrow-grass
* s7 w4 U) `. @ do-plots
z% w1 u7 b- V2 R) O5 gend
* Q, u. X- r$ jto move-turtles
4 ]! k, j% v7 K( }6 D# ~6 \3 r ask turtles [/ p6 v) y5 |+ D# e3 `3 }; J! _
right random 360: h! D& N }7 f- x& v4 y5 j/ `
forward 1
: d3 R' @: m+ i7 [/ Z: { set energy energy - 1: t+ S! g2 d! Y/ G* x: T4 y/ j. P
]
z8 f" X+ h+ Y r- B/ U- ~1 pend
( H v7 Q$ A9 D; dto setup-patches. }" z2 ?$ ^8 a% f9 F5 ^8 c$ K
ask patches [ set pcolor green ]
/ a2 I2 M5 j, d) m0 hend
0 D" g) l8 c- J4 E* bto setup-turtles
# c, D# A/ ~9 c" E/ R create-turtles 100
0 p( V9 I& I' x. R$ f N( s ask turtles [ setxy random-xcor random-ycor ]
: {& C0 _+ X+ T# mend
! c% h) [& `$ Q# T: q0 |& Ito eat-grass
/ f' S2 \. [ P4 c0 x ask turtles [
* U Q& J8 E4 L2 e! G* Q- w if pcolor = green [
% v9 T0 R0 F( O+ b set pcolor black9 d; u& o% G* }- o- O
set energy (energy + 10)+ Q$ i2 v2 } K
]8 ^0 `2 i4 s- K" ?* z& G
ifelse show-energy?
9 O" L" V' x0 V% c) U/ f8 o' O5 e [ set label energy ]
0 n/ c5 Z' [0 p [ set label "" ]
7 l0 ~6 V7 Y* q* h P' k- S+ D ]6 b7 S+ U. g2 R9 `: c L
end, Q8 w" W% ~, }0 @* b
to reproduce
9 M& Z5 k: b9 Q+ ] ask turtles [
1 M$ r6 R9 x" b if energy > 50 [5 k% D+ {' l$ E4 T$ X+ h3 T$ }9 Z: _
set energy energy - 50
; r8 J1 ]3 }! K3 N hatch 1 [ set energy 50 ]
$ _2 H) x/ l; y8 O, w" O ]
( G8 V$ D/ v# p, ]; [+ l8 @/ O ]3 y/ @, v; r% H8 @
end. ?8 i2 g2 Z7 Q0 q8 I o
to check-death& [- f3 T, ^- j4 C
ask turtles [' j2 {; z/ H# h+ `) {
if energy <= 0 [ die ]& H# L6 Z: @, i/ V' Z) h
]
3 W4 D6 {4 A2 t0 S2 a9 T" @end6 Z" t6 x ?1 X9 Z0 V" F2 Y R* ^
to regrow-grass
* e8 O, u" Z. H( @2 H# Y ask patches [. n. f5 s" t" e4 T `3 E1 q1 R
if random 100 < 3 [ set pcolor green ]
& y; N3 D4 P" `* u% n+ d ]
! N# x' m/ q+ v' Cend+ b; h8 S1 U* D; c7 n
to do-plots( e" U4 M; [# \
set-current-plot "Totals"% Y/ B0 P2 C$ G$ P$ a6 o( f
set-current-plot-pen "turtles"
1 T* v6 B3 X$ m a( K7 Z1 `- k plot count turtles
: Y8 q* Z$ B8 j set-current-plot-pen "grass"
1 w" P# [8 R: U/ h7 b plot count patches with [pcolor = green]& g9 \& l# ]. A w1 ? k
end8 i% J/ N8 }5 G4 ^
可是运行时提示no such plot: "Totals"
: D' P; {6 J* i K% K3 a$ Werror while observer running SET-CURRENT-PLOT
( Y3 C( ]+ G+ k$ y& V3 [ called by procedure DO-PLOTS6 v" {* T& M. q5 ]
called by procedure SETUP
& i' i5 S5 D: c' `1 E called by 按钮 'setup'; v k' q/ F2 Z4 a7 f
求大神解答啊 |