我编的程序如下turtles-own [energy]
$ I) G K! N, I ?% Uto setup
) A/ P3 l4 q2 p" a clear-all* N8 N8 ~# f9 H/ T7 E- K: ~
setup-patches/ V. S3 _2 [" h$ A% H T2 ?
create-turtles 100
, V3 b: q# m! z& G+ [/ l do-plots
7 g5 N' S7 b E" x; U ask turtles [ setxy random-xcor random-ycor ]0 u: n' `! B' t3 p
end
1 G& ]3 [! C' a3 R, O; eto go
" }8 V+ t% h) G: J3 [ move-turtles
$ T( x$ c% u/ b9 r0 x eat-grass" f; q% i6 i. w; l) D
reproduce
2 Z5 W/ ~% ]4 s- W) r K check-death
( U4 w3 [9 q7 E regrow-grass7 p: U0 e% N7 a1 s X T4 v; L' K7 @
do-plots% U; Q: q, u9 |& ?( ?3 i# F. F
end
- l0 A& I/ t7 v+ G1 W7 Tto move-turtles4 N! a$ M# k7 I
ask turtles [
; g( |6 v* O# e5 b* H9 Y7 r5 ~ right random 360
7 j6 F2 u0 H, [: a* s; H forward 12 \- T0 g( C) t; ~: W9 p( X
set energy energy - 1
, M/ q% }5 V: `2 J4 E9 N" l" Z0 \9 ^ L9 q ]" ?$ ^& {- H6 n7 A5 E5 ^; X/ G% [+ z
end3 i2 R3 u H3 s
to setup-patches
' o' G, A* K3 ^ S# f5 U2 s1 R; y ask patches [ set pcolor green ]
; }2 b9 p+ s# q! R# v* c: w' mend
/ ?3 `0 g: s3 d, \to setup-turtles. l. ~1 q0 `6 U1 G! t
create-turtles 100$ A5 @" R" z6 g: m
ask turtles [ setxy random-xcor random-ycor ]
$ ?+ N; F" b2 U/ t( Lend6 V2 T' n# w$ N6 L8 ^3 r- Y
to eat-grass
1 a, M) q0 L* d8 K* T ask turtles [0 V1 r! }2 z2 a
if pcolor = green [
& ]4 s; c- N7 ~. A; \& ]% e set pcolor black
) ^; f3 m$ n3 n7 q" c, g0 g: ^ set energy (energy + 10)
% H. l1 p3 {/ G/ [9 ~9 e ]
' Z6 m, J8 J2 w( d) A8 D* T1 n: d ifelse show-energy?
. N- i2 {$ |- A [ set label energy ]
" o' A! m# w: |9 R& ^# \. I% U [ set label "" ]4 o3 u9 G# z1 y2 \7 O! x" J
]0 h5 ^. r& ^0 b3 h# h1 [& J
end
, {3 A0 ^' X2 q9 k/ Ato reproduce
z( D0 y# {8 ^; ?% `. N ask turtles [
4 ^0 ?. _! U" w" N6 f7 I if energy > 50 [6 z' T9 |# N+ k
set energy energy - 50
0 g ~* z" s' Q; n" Q9 o3 y! L: e hatch 1 [ set energy 50 ]4 k- p; G) ~- t' ^& \) D1 K
]0 u4 n. }! v, \+ I2 }
]
9 p9 V& C, v" f5 @. T9 Z& x5 ^end- r' l) d$ D, ~4 M' [6 `. k
to check-death
# A$ j& W. a" {2 f6 L V ask turtles [$ b. X& R N, `4 K# X: D: v
if energy <= 0 [ die ]
! P( r3 g" W. N ]
$ S* `6 V2 P) ~% rend+ f' r# B* |5 B+ p, z0 V4 t
to regrow-grass2 s8 ]/ }7 H' q) Y3 W
ask patches [
' ~9 E+ A9 x9 x if random 100 < 3 [ set pcolor green ]
8 W2 k" f" [0 r8 s# g, N0 v ]
2 ?* S9 P8 |5 yend" K ~9 @) W8 E. x, w* w/ p$ o
to do-plots& k' k- W0 k0 ^5 w# `6 E
set-current-plot "Totals"# v' U ~# k: j. w4 z: s% k
set-current-plot-pen "turtles"
4 u' {5 h; u6 W( d6 x+ n7 m1 b) K" C plot count turtles9 P" u1 S2 @/ Y
set-current-plot-pen "grass"
% @3 f- V5 K7 G5 D) U/ t' y% A; T plot count patches with [pcolor = green]9 _' k W+ @8 q1 ^: @
end
7 O6 l6 J4 f. g- Q2 h U7 u# _可是运行时提示no such plot: "Totals"
7 k# q+ M" x9 e. G% G. Eerror while observer running SET-CURRENT-PLOT* t. K, \# ]" g
called by procedure DO-PLOTS0 k; Z0 `5 P: X; c; B: m* \
called by procedure SETUP
" I8 n3 f7 u0 g/ A+ t6 o' Y3 c! O4 h7 G called by 按钮 'setup'
5 l. r* x8 E% G9 {求大神解答啊 |