我编的程序如下turtles-own [energy]5 M: |# B) u' c' E% u: a
to setup
1 ?7 h, h' Z: b5 Q0 n% m4 B clear-all* D4 S0 ?& u7 z0 l# P$ b7 \
setup-patches1 V+ Z+ L# L' N- X& X1 s
create-turtles 100
) z2 Z f* G2 j do-plots
0 S% a: _: x) w* n1 A2 o5 g7 j ask turtles [ setxy random-xcor random-ycor ]
/ J8 L5 `5 V5 D1 o/ qend K/ }6 d* H. R1 j0 n1 q8 ]' b
to go
( p2 D, ~' {& K move-turtles5 c) e: s3 x, t: J2 t6 V+ w+ r* P
eat-grass
1 c! ~+ |1 x3 i1 j; p4 q/ l" v8 z reproduce- u! y0 e* {: Q, V. Q! f
check-death# c* _( c8 S" [
regrow-grass
* g3 A; L1 K K9 S2 N b* e; k do-plots1 z; C- B, b$ w# U7 n# v
end
# G* [( P6 U5 H5 [4 ]+ R! Gto move-turtles8 O) R$ l$ P" _
ask turtles [
% G" M U4 |) u right random 3607 v9 |, }/ \) h3 R9 E7 ^! U
forward 1! J$ N7 |9 _4 E, [/ {
set energy energy - 1% |1 I. T, { o' T# Q
]
3 z U1 W B* Y) S3 Qend
8 k- ?/ A+ ]% h' ]. j$ k& J( F: Dto setup-patches
! Y$ E9 a% ?: q9 ^ ask patches [ set pcolor green ]
# ^4 t! ]; a' E; q5 O5 j Send
3 H4 d" ~1 G- m* _# e$ I5 Hto setup-turtles; T6 h X" l0 c& C1 U! B# \
create-turtles 100
3 L0 r; }5 f- E P ask turtles [ setxy random-xcor random-ycor ]
; L( i3 O+ a; E' A. a6 j" Iend, F3 e+ g/ i' |8 o+ ~- `
to eat-grass- }' k* E1 d4 A; ~; g2 w
ask turtles [% e. y/ X5 D1 A6 H8 {
if pcolor = green [
' Z0 q$ c8 |6 U' r% w% {5 G set pcolor black& V# y8 ]! j4 r! H' n3 {0 L
set energy (energy + 10)
$ @% ?! i) V3 y& O ]
5 h- \/ m1 j8 C) D& { ifelse show-energy?4 `- e: y2 ^* m, Z7 m
[ set label energy ]
% h, y) z& ~. n$ f [ set label "" ]
* e8 H, U. G* f ]
8 y! u) t% Q, S* U; Cend
( r# G: j. W. t& tto reproduce
; ~. x7 ^! b$ a ask turtles [
, m0 @1 [& F3 D if energy > 50 [, P( Z1 ]. G3 P/ s" s, h9 z; z
set energy energy - 50
8 H7 _: u% c4 R, @ hatch 1 [ set energy 50 ]' U$ J6 n0 O9 o- ~2 S1 B
]! F' v0 C3 w. S& s5 S D: r
]8 s$ O" J. I" a' m$ f
end
2 F' g9 I3 f! Vto check-death
y" f% H9 O+ S; N0 H ask turtles [; L8 e2 j p% w) d
if energy <= 0 [ die ]
9 h0 a/ Q. Y+ [) @0 Q! `$ y" C% \8 V ]7 B, Z# O5 o5 c: ]# e
end$ i- \* h: g- R) r2 @* X( |
to regrow-grass
3 Q' A$ r# ^( t( W+ ]& e ask patches [+ E4 j* V( d, i5 G
if random 100 < 3 [ set pcolor green ]# w; P! k5 E ?0 }
]
3 P9 o, X) g5 H& z% fend5 V7 b* j! d' ^) {/ g# G! J; ?% ]
to do-plots
C2 A: L0 I- ] set-current-plot "Totals"
5 Y3 C6 n# E) a& X8 L5 r; M set-current-plot-pen "turtles"+ z" f2 s# T2 E& H, B' |1 z
plot count turtles
0 P; C. b/ V$ O' S( A3 { set-current-plot-pen "grass"
1 P2 P( P; u# b7 [# h5 |; W3 X plot count patches with [pcolor = green]
6 v- X( S2 B9 j+ U" p! jend
' m+ V3 T) Y4 ]* x* O可是运行时提示no such plot: "Totals"
7 T, U! C9 N# M+ b. [+ h6 `error while observer running SET-CURRENT-PLOT
+ R6 E/ E& k6 v/ i9 @7 s4 l1 z* R called by procedure DO-PLOTS0 l& S# K4 p$ t% T" a' N/ J5 @
called by procedure SETUP$ A/ i6 `5 B9 j3 n" b
called by 按钮 'setup'8 o- Z* g/ |2 I# a, z+ n$ j3 U2 M
求大神解答啊 |
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楼主
发表于 2013-5-29 00:25:38
