我编的程序如下turtles-own [energy]/ S: ]6 Z' x$ [; U6 R1 k: l8 n
to setup5 r9 Q1 k, \ u7 v( T0 g
clear-all
# N0 W' [* P* a, k4 d6 n* P setup-patches6 A- ?& A0 J* V' x ?' H
create-turtles 100
' e5 y* k$ k V: k do-plots
3 ]# V5 y$ ?0 S* [& Q) ]! m7 S ask turtles [ setxy random-xcor random-ycor ]3 }: T: A8 t h, n+ R* Q) N
end
2 ?1 h+ Z# |2 y* ^2 ~5 ~to go. S V- b# `( f# X% T
move-turtles j. i1 P7 s, {* b, N: K
eat-grass' o/ s- w+ o8 K2 f0 m
reproduce
: Y! F" N9 H, x9 h check-death
5 W% }" V& s& O9 n+ ]- C$ _6 p regrow-grass+ j# Q8 y- t8 [* q+ B, i% n. S
do-plots3 P( o$ U; i, K7 m2 Y
end+ g. |+ f0 y2 w; U6 q
to move-turtles
% D; U+ A w! E1 L5 R8 m( s ask turtles [
' F1 F! A1 U0 g right random 3607 U2 X0 z6 G6 v( b1 u& K7 X5 m
forward 1& ?& [% d& u/ T T! C E g
set energy energy - 1- Q3 k0 Y1 S. w3 X; c# \
]
, r4 y- h8 t, ^end
- P* W( ?( B9 R+ eto setup-patches+ x0 l% j5 j9 f y
ask patches [ set pcolor green ]- ^8 o8 \- Q6 I% q- o
end
( M( U# F- _3 }# T! m. i& mto setup-turtles
# s) x$ N2 {7 X+ j. [, a create-turtles 100
4 p q# i) b5 B6 o0 w( J ask turtles [ setxy random-xcor random-ycor ]
$ s. d8 `' Z9 l/ `8 [! iend8 d0 T5 l% l! V+ S( p i
to eat-grass5 E! S% Y9 \! u1 v5 P
ask turtles [# c4 D [& J; O/ d$ Y2 {. U
if pcolor = green [
9 c+ B. f- A( R9 ~ set pcolor black
1 [$ V; {- s6 A( ?) E set energy (energy + 10)# W4 p; n9 D* b" O, G2 p
]4 ^3 Y( J! N+ |6 g) [, _5 g
ifelse show-energy?* Y: D" p: p4 s J6 ~
[ set label energy ]
5 C- E8 S( S; V [ set label "" ]
* _) ]5 w( h# I# L T ]
" Z: O; p8 ^8 f8 q# h# iend
' q0 q) w9 E9 y' {4 ]+ d, uto reproduce
# Y% }, w( h. t) { C6 s ask turtles [7 f3 V: F4 C) p1 ]3 e
if energy > 50 [
; N4 s* V( i) n4 T z2 M& R5 i set energy energy - 50) H1 M; X3 f; t9 d3 s' K! w1 C
hatch 1 [ set energy 50 ]
* j5 t1 E6 l2 l! |3 A9 a. } ]/ T+ y2 n1 x8 F7 _
]
3 P" h+ C6 d% ?end% U5 ]2 `. i" g1 U- Q7 B* \9 Q
to check-death
3 B( h1 K7 z" u ask turtles [
. S; R" g( l% I1 k& v; E if energy <= 0 [ die ]7 U# ~& |% v/ w4 \6 H
]* p9 o% J- C3 q
end
5 _1 h# I0 x, F/ ^3 u: |to regrow-grass
% Q( A$ B- j( x7 n& S; t ^ ask patches [, q- K2 u" \" v m1 M
if random 100 < 3 [ set pcolor green ]; o8 O4 l$ @6 D8 \* w; g
]
O% U) D# |* }$ B7 }: a& \( Uend8 g- F+ S9 w: ]1 \1 M2 s
to do-plots5 C( t" d" N. I* r& L& t) ~
set-current-plot "Totals"& D, C1 P0 ?2 T0 K; N* B# `0 _
set-current-plot-pen "turtles"3 p" O t0 m$ ] T
plot count turtles
* ^0 f: n" n/ y0 ~ set-current-plot-pen "grass"3 L2 C! A$ E; ]3 _4 \' ~
plot count patches with [pcolor = green]) |7 o0 f1 V- d9 `" P9 U
end" q" J, o: P& U# Y' }
可是运行时提示no such plot: "Totals" }6 T( w7 g+ R" Q( \
error while observer running SET-CURRENT-PLOT
# W, F u( u/ k; _ called by procedure DO-PLOTS
* s; `$ d/ Q# b0 z9 d" O+ G called by procedure SETUP ]$ J# M5 k- x$ ]
called by 按钮 'setup'
; N: ~4 N6 U5 [! }: }# G2 L4 C" c* m求大神解答啊 |