我编的程序如下turtles-own [energy]/ D$ g( P8 [0 X$ r+ F) [
to setup
4 O7 e1 W9 D4 V- R0 D# H clear-all
0 I2 T$ k& K n- _$ E b) w3 Y6 ? setup-patches
: D6 b" U( r+ M# J, r7 @ create-turtles 100) r- J' C. k. r, O
do-plots
7 u1 C1 \* t a$ a: a. T ask turtles [ setxy random-xcor random-ycor ]( @! l: ]9 S& ~) ^6 F. U6 g
end5 @6 D8 y# o7 p& I: ?- q
to go
+ T# i2 p$ J6 n8 a move-turtles& ?7 U: c% Q1 E" Z' J: z
eat-grass, }9 U0 z9 P: C; A
reproduce! Z2 N' S% \! v7 ~. s
check-death
/ }3 R3 ~ M$ {/ R* i/ v9 Q" s regrow-grass, c* y7 [5 r2 c8 r. u7 q' S V
do-plots
7 z: n% o v( r) Uend
4 D$ ^7 q# _6 U: N5 Cto move-turtles. s- w. U ~( W" ?9 j" M8 v9 P* z
ask turtles [
: I f n/ r0 | M7 r6 i; ^ right random 360- |; S5 U3 r3 q. J
forward 1
' C$ L1 O( P- Y1 r, v1 O9 [* e set energy energy - 1
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end) O4 m: M1 _. { q& i
to setup-patches8 W. i9 `! k) g, c5 p$ w- @5 I7 _, \
ask patches [ set pcolor green ]
$ j& K& S6 N s% C5 ]7 Bend
, b+ t S- ?: D/ ~/ F) tto setup-turtles
! r1 t; M% q& e6 m) p% C create-turtles 100; [8 E! d w* y0 U( c
ask turtles [ setxy random-xcor random-ycor ]7 y4 ~+ {/ c3 z2 g- R5 G
end4 T# \) Z$ @, n# [" ~6 P
to eat-grass
7 x. P5 b) x- F# W& Y ask turtles [* s6 K. Z9 ?3 F6 s$ e) q' L H
if pcolor = green [* y* Y, g; d" p0 e6 \ N
set pcolor black
% Q: ^3 R7 [! i9 C2 I! L$ O set energy (energy + 10)! h; u( x5 W! J3 v( @ G
] c# `# G! u5 x) S9 E7 I
ifelse show-energy?
" w" D4 w# V; I/ `! Z6 b [ set label energy ]
' ?: G4 e" d" |% q p5 M0 P [ set label "" ]
! O7 I, {# e6 n' P0 _- `+ R ]
& J' v. @% f! i5 _6 G% yend
9 `$ j) Z0 I8 d' T7 \: lto reproduce
u2 R* ~! M. `# l, P ask turtles [
; w, m# o& V4 K+ J# ~3 H% M0 C if energy > 50 [
2 s. j+ X2 w% J& C. j set energy energy - 50: _; g2 L7 F1 n( Z2 ^& x
hatch 1 [ set energy 50 ]' V, T! a* l ~; z% y- N6 w
]
" R5 }( P$ t/ m) u ]
+ u: {( |4 v; t* d& J" m9 Aend
+ b3 U( x% W1 C) T' y% @3 X) Y2 Eto check-death6 I- C2 C6 W0 j) h. D
ask turtles [; z+ h; l5 }# p0 G9 M! H2 G
if energy <= 0 [ die ]
: Q% p6 j" i9 P2 e8 f ]
8 G- \0 _ O1 x9 E* S' J& eend( I2 o' d) F T2 d5 |2 v+ w4 `
to regrow-grass
) s' _1 q* _4 f4 u( P8 _ ask patches [
) V+ s4 H* c W+ c3 N' d: q0 g/ i if random 100 < 3 [ set pcolor green ]
0 |4 n% S) V3 _. F% {0 F ]0 B8 h2 @6 S$ `; g6 B% _" ~
end
& y9 f+ O3 A4 K2 j0 ?to do-plots: K! U3 @4 H% r. ^( ^- F
set-current-plot "Totals"
9 u7 i2 p! a- I$ }9 }3 u set-current-plot-pen "turtles"3 C8 Q) W& C v9 g) A* \
plot count turtles
2 d8 V- y x% g7 P/ ]5 s: J set-current-plot-pen "grass"
- T8 ?( O4 Y/ K3 B2 m plot count patches with [pcolor = green]3 t! b3 ?! A4 ]2 l1 F
end
' k$ B7 N, l+ n. Z$ B4 q# f+ x可是运行时提示no such plot: "Totals"9 V, T' T C/ p, |* e& Y+ v" K
error while observer running SET-CURRENT-PLOT+ C: ^* C/ Z0 ?" f" K
called by procedure DO-PLOTS
. J& G$ d [4 w0 f5 v2 @' Q8 c called by procedure SETUP
3 c( |9 H% ^) A7 Q* @3 P# C called by 按钮 'setup'
2 p x( d( u7 M$ u求大神解答啊 |