我编的程序如下turtles-own [energy]' t$ f! S% o; V- _
to setup( E$ N6 j3 b# l; R8 K
clear-all; Z0 v9 [0 x4 o
setup-patches
% m L% q9 h) ]: O, v create-turtles 100
/ P- k6 q+ [$ ?6 q do-plots
4 {$ s$ \" p1 A$ t; c- I ask turtles [ setxy random-xcor random-ycor ]) V7 v8 i( b$ i3 a
end8 K. Q* ~, Y8 W
to go' W4 ^7 y: Q1 F+ \8 O+ L1 K
move-turtles
; h- n1 X* t" @1 K1 \! N eat-grass" ~" E, k/ A; n; M1 W3 Q& ~* i
reproduce3 H2 p% A4 _6 \% F/ e' ?4 z
check-death
& n1 k: {5 e8 p5 D2 g6 G regrow-grass6 B8 Y% i) R0 y, [. w7 a
do-plots2 j2 F1 p9 J3 ^3 q1 K: y6 z
end
. @+ m$ \* K9 Wto move-turtles
" i) t0 X5 p' t5 C f1 \1 D k ask turtles [* E$ Z: u# U, s: x6 w; w. g
right random 3602 O* x( X) L$ g; j5 b9 n' s& a
forward 1
, w; q3 U# m% x% o' @ set energy energy - 1! ^1 i; \8 H0 `7 F3 A( V" P2 B
]
* y5 H; Y6 E+ N3 U4 I8 m* Yend" t6 ~& f/ c6 @' |
to setup-patches
" U: l# B$ X9 q8 x( D, W ask patches [ set pcolor green ]
1 Z5 {1 J& J: ~6 o [6 Jend( O$ v% c6 w7 `3 w$ N
to setup-turtles
4 ]( k! C9 B8 i create-turtles 100
) R% B1 l' p/ }9 i* H6 ^* l ask turtles [ setxy random-xcor random-ycor ]
1 I3 q- D: g% R9 ]' Aend
& k d0 k; G5 S0 w& i" xto eat-grass
9 L" Z3 Z1 \; }1 g& V7 i- g ask turtles [& E5 |3 L" O4 Z8 Y- b* \! y( \3 W
if pcolor = green [) R- b; D+ m( v' J
set pcolor black
) T. v0 v1 T" B' D3 K, ` set energy (energy + 10)
: A2 D% q9 ^# G* g. d7 J; T/ d ]8 y) A' |1 c* i1 j+ y
ifelse show-energy?
: s6 z9 C/ A' x8 { [ set label energy ]
" s3 X0 o% ^ g* O [ set label "" ]+ P1 g' g( J4 E
]: @3 Z" {, X' n4 y8 |$ r
end i1 c T$ F; A, G: N9 }3 K
to reproduce
6 e. |" i: P, N8 R4 W ] ask turtles [7 T5 D5 v1 X- \
if energy > 50 [
( Y# j/ a, m+ K' a# M7 P set energy energy - 50
2 k' ]6 M$ P9 @) w; s hatch 1 [ set energy 50 ]
4 O y, ~6 t9 M: e/ L$ S; x" A ]
; l' P6 J9 O1 {, ` p ]$ d4 h' T ?7 ?( c
end
- t$ a, m2 ^* D2 jto check-death- p7 m$ F6 |* ^" P$ o- R" `4 C4 N% p
ask turtles [( ~9 I1 z* K; o+ u8 o+ f
if energy <= 0 [ die ]- j' G: V8 R) L' ?
]+ A" } N& E0 }) y
end
: m. e$ {& s' y' }/ nto regrow-grass
* W, o9 ?' u- W. V3 i3 \5 d ask patches [
% U) ?+ o: ^- q% a if random 100 < 3 [ set pcolor green ]4 V$ E$ M$ M9 A, g: E4 i
]
; h9 D* t ~; E) K4 ^end
7 _8 Z' j! n0 [1 K$ xto do-plots
/ @. n/ `# T9 }+ U. w* X3 m set-current-plot "Totals"
! j. ?* l, g0 O8 D f5 Z L set-current-plot-pen "turtles"
- \2 e+ s: W3 D* W( V plot count turtles' R+ H: x& l! z. r) S
set-current-plot-pen "grass"
$ e& V, a, E1 a( [5 u6 Q, | plot count patches with [pcolor = green]4 G, F6 u2 R' g1 E" S9 y
end/ k/ ~0 q. ]# m8 u7 H) k' C
可是运行时提示no such plot: "Totals"7 Q: o+ ]6 J0 m2 @
error while observer running SET-CURRENT-PLOT% b+ D* B( b8 e
called by procedure DO-PLOTS# i* f4 A% Y2 y: Y
called by procedure SETUP
3 Q; c. x: e1 T3 ^ called by 按钮 'setup'
1 z9 @ _; J; N0 p2 Q3 M0 X1 x求大神解答啊 |