我编的程序如下turtles-own [energy], l% r" Q: t& f T% D" N; [$ l
to setup
7 S7 ]* }) {4 Z4 D! I! }/ B clear-all4 z; u6 X9 G$ [$ h- A1 S
setup-patches; ^% S1 b: Z# B# G) w4 c
create-turtles 100
4 `! J. [% A1 t% D# O do-plots, \0 t8 l$ t; g# c9 {% D6 n
ask turtles [ setxy random-xcor random-ycor ]/ r" s' ?9 S& X2 I, s- s# v1 u
end
( P! z7 x1 \1 fto go. P* u9 X$ y/ K' U
move-turtles
5 I3 {' I; {* Y3 } eat-grass
1 ?/ T. H/ c+ b8 i1 F- |1 m reproduce" N6 n: l2 L0 c8 u( I) @) W- A( o
check-death, \' h0 S l4 D7 _, \8 M
regrow-grass
' \' {0 C3 f# S" Q% B0 ` do-plots$ A2 A2 [1 d* k' _
end
7 o! h1 H# d0 ^$ c& t' m- Nto move-turtles
+ h& J9 V+ m5 d; v1 J1 j. a ask turtles [
$ l8 T: I% J0 z right random 360) e7 N' s) H; o% r7 {: N
forward 19 P/ n; e( O$ p# k) O0 d7 b
set energy energy - 1
3 D9 x( \' [7 l6 X ]
) P9 b' J# c- ^end! f+ p8 [7 t: a: y: i
to setup-patches* [8 Z6 }3 {& d) L E f
ask patches [ set pcolor green ]
9 A( M+ _# R3 z; I+ z0 G+ ^$ @7 kend
( e0 h4 a9 Q" ?* L: c8 x' Yto setup-turtles% U2 X# P" {9 o( Y3 d% ?
create-turtles 100( F! O; G( F4 V$ }$ T
ask turtles [ setxy random-xcor random-ycor ]" p) M8 t. s* I9 X
end
( N! t) C" [% Eto eat-grass
; n# S2 i& L3 P ask turtles [
0 r0 R, A( Q) q; a8 v) @& F if pcolor = green [6 `1 L7 L- q: T" O# [3 r
set pcolor black) |$ M( p5 z9 z ~8 y! D) v$ c: N
set energy (energy + 10): _5 N; J+ I, C& b) b
]; Q: M% x& j& ^4 J# y. j& c
ifelse show-energy?$ H4 d& d/ N! Z6 @0 h7 m
[ set label energy ]
! k- l' a# d3 m% ^3 G [ set label "" ]4 y0 g9 A3 a* {% O' z, E
]
) J1 o9 A F, _; E% y* kend
" t" k4 L7 x% A/ dto reproduce. T* Z: A( B; E+ z: ]0 G5 W' ^, i
ask turtles [
1 O2 T1 d! x8 n+ i( Y if energy > 50 [
6 X( X+ d6 ?- s. h: k# W: x set energy energy - 50
& N; A) s" u# q# B; d hatch 1 [ set energy 50 ]
) K E+ c8 ?. \+ a7 J/ U2 s ]
( ?* {+ T% P% B' s# ?1 z/ O ]$ s: u! m6 d. Y% t+ ^ ~
end
8 {3 ?8 i+ e# Bto check-death3 q- V8 c+ T( C( h
ask turtles [( A, V; d1 P' C6 [3 ]
if energy <= 0 [ die ]
+ h/ f2 q+ B& a7 S ]! v2 r' K& O) O8 u9 r: }
end
% B$ i$ T1 Q, i% ^ Jto regrow-grass
. Z; l# `: ~+ `1 u& O% e! M0 x; t ask patches [
4 T9 V# \) Y( Z! ? if random 100 < 3 [ set pcolor green ]" c$ v% B" ^! N# o w
]+ a( z/ Y3 r) A, z3 `9 Z
end: P* l; @2 h V
to do-plots
* _; b( X# A5 m; @" c; } set-current-plot "Totals"! k! @9 B1 P4 h
set-current-plot-pen "turtles"
/ e1 K* }% l( W4 d+ M' G plot count turtles. d) s }& R6 G+ f
set-current-plot-pen "grass"5 I; F9 v, g) S4 n7 ^
plot count patches with [pcolor = green]
" n0 |" a: x! N4 x- L1 vend
& e0 X5 D! J0 Y; p. e. g1 y可是运行时提示no such plot: "Totals"/ p& _0 b. @* B- a3 `
error while observer running SET-CURRENT-PLOT5 l3 l" A& o1 p5 ]( X* z
called by procedure DO-PLOTS
3 h2 L. S* V4 P8 w called by procedure SETUP5 {! O8 F+ f% X9 ]2 s. }0 X3 j
called by 按钮 'setup'. k- S, f9 n2 R
求大神解答啊 |
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楼主
发表于 2013-5-29 00:25:38
