我编的程序如下turtles-own [energy]
) A8 @( I6 C! V, L* @to setup
2 E, \4 G( l+ o, e% G! Y5 O clear-all
% z S7 }% I) d& W$ p$ d setup-patches
. W' Y M+ O1 T9 w4 d, `0 M create-turtles 1003 _) X' E6 u R% W
do-plots, Z# v; ]! w/ q/ e$ \
ask turtles [ setxy random-xcor random-ycor ]
0 e& Z7 A0 N8 Y7 k5 a& x5 P# [& O. j. pend
3 x! l% P! p0 ~3 Sto go
) I+ R: v7 D8 W$ q6 { move-turtles
7 P# e! r& L9 ~3 |, J9 W# _ eat-grass/ M! y" B' H; i Q3 y( G
reproduce4 e5 `% g0 s6 u0 }6 q7 l- E, ^
check-death
- C2 g- d, G; T) ]% f4 l8 o* B regrow-grass
4 b( U# x2 {2 m9 W/ P% X do-plots* E i; `+ a# g5 _7 x# A* v
end2 S' x( e c1 G6 x" ^5 L3 R! V- v" u
to move-turtles/ [; T# }( R2 O! a. r4 c: P8 \# `
ask turtles [% P! ]$ s' W: g" I( M/ \
right random 3600 e7 Z5 F9 A) t3 p" g6 b7 i b
forward 1
5 i$ I+ h/ Q$ U: u+ x- x set energy energy - 1) V) q$ ^1 p6 F8 R
]$ ]. }0 _( L$ y# ]. z
end* _* p, D4 m/ X0 ]. y; i
to setup-patches- M0 @# S) r O4 D. A6 G
ask patches [ set pcolor green ]. b: ~* C6 t; J& t
end$ k: u+ J, v& _! M
to setup-turtles
5 D9 s& g6 f. ]7 @9 @; R create-turtles 100
. B0 E2 o3 E+ W# ] ask turtles [ setxy random-xcor random-ycor ]
7 g- B8 p/ ]' T+ A8 s" O6 U- nend! R( d! v/ X" I0 h6 S3 }
to eat-grass
& y5 |$ g4 P0 l. P( J w Y' V0 F* s9 ` ask turtles [
7 h: |2 J* r7 m if pcolor = green [
8 m2 x' ^+ N% K2 z5 P ~& R* Q! X% D set pcolor black) T3 q2 Y, } e9 `- t) l3 W0 d' n& T+ F
set energy (energy + 10), }7 T: E( i( [: q+ C9 T# @0 k
]
- }; A) o3 L2 A$ M0 f: j! d/ j ifelse show-energy?: ?+ O4 O( H9 i% u4 _6 p
[ set label energy ]
' D" f4 j, x [% c; D/ N8 f [ set label "" ]
( [8 y& [/ [4 ?' P8 @# \) Y ]* e& Q8 l6 K2 R: ~
end
* N, t3 V" {# n' Tto reproduce
- U7 H& e+ t0 a/ \0 C; N ask turtles [1 b( D- f4 s6 J8 h* X1 I, Q* H8 q
if energy > 50 [3 {1 u4 c3 H9 i4 C9 W
set energy energy - 50
7 D" Q4 x- n) @. q- @, y, b hatch 1 [ set energy 50 ]
8 V; G* C( @' N4 t1 A D* g+ { ]
7 o- p9 R% |) i) t" o% t/ u; J+ |* F) y ]5 F0 ` b9 \: m" M
end( n/ c. i, K1 [9 J% b5 [
to check-death
3 P6 w. M- X7 S8 K ask turtles [
* ?4 K2 s9 O9 y. S; b$ Q if energy <= 0 [ die ]4 O) E$ u" _ ?' F* h) e
]8 ]" q- R: D1 i+ ~# K2 w) @
end
, S6 A; i' U2 `" ~( a mto regrow-grass0 G2 ?; c' c9 v
ask patches [
! Y4 F. W$ S) Y1 ? if random 100 < 3 [ set pcolor green ]
3 L' X) y' @! u3 L) Z* { ]
6 ^; D8 a6 r8 H& {. S+ c; G. I- ]5 Uend4 |! Q( Y, Z7 Y0 F; Q
to do-plots3 B, p3 j/ z2 q4 J
set-current-plot "Totals"6 `( s0 E% w0 o
set-current-plot-pen "turtles"5 \, E j3 k. b% i
plot count turtles# W. l* b# ?9 M* S4 d' b8 A
set-current-plot-pen "grass"# ]( m& C; t4 V* h B# B9 y
plot count patches with [pcolor = green]
6 {' ~5 k: J! o; rend7 C( w# j- f$ q8 b6 x, Y& \& c
可是运行时提示no such plot: "Totals"
8 M$ [3 p) {4 l) werror while observer running SET-CURRENT-PLOT
( t2 b. V( j- f) x; z" N called by procedure DO-PLOTS
' }! \4 c# t1 e; j9 [6 F6 F called by procedure SETUP
: r; A6 K+ F* Z3 w$ e$ |+ ? called by 按钮 'setup'( Y3 `# Z' K$ _" [, E& v
求大神解答啊 |