我编的程序如下turtles-own [energy]4 W; z) }. U2 L1 ^
to setup
$ }2 U% b/ d1 _9 Y6 K clear-all
8 c. f& \! P E5 N* e setup-patches* {5 K5 a# l1 _/ O, l$ y) k# @/ i. L
create-turtles 1000 f. c' r; p% I* S
do-plots: h" j& m( Y% `& l( k
ask turtles [ setxy random-xcor random-ycor ]7 o! i& Z" Z+ h7 U$ X
end o2 d/ m% g; P
to go
, j I2 F7 B) V0 O+ g move-turtles
; g: ?' E. K T8 |( B eat-grass
0 r* r5 H' h$ P7 r# w* @/ O reproduce
; _7 E5 l! k# z( b1 h3 m( F# r; _ check-death
- P) K! {: U* r7 ?- P- ]5 z regrow-grass2 r1 f8 I T4 ?# ]
do-plots: p) t, w" q% e( ~
end
4 u. N7 M4 g5 x/ `. i0 d. Oto move-turtles
0 o$ d X5 B+ s% E ask turtles [
9 i: Z/ ?( I3 n right random 360
. m7 \9 i8 l) v- j1 }; n- T forward 1' K% |) q: F. a0 r! B$ @- a" p
set energy energy - 1) k8 [- L1 k* M+ j" T
]7 Y$ @! O2 `9 K- {" S/ |9 \* o' w0 S
end
% c! h" C; a* t- ^% h' E, Bto setup-patches
8 ?$ _5 |: j: }! c9 z* b ask patches [ set pcolor green ]
! W9 ]% j+ j q6 ]6 Kend
+ m5 [, s; b3 ~& h j1 N: Vto setup-turtles4 v# ^* z8 D) X( z
create-turtles 100
# c* n- Y {# O: O3 J0 _ ask turtles [ setxy random-xcor random-ycor ]( M+ Y$ E7 q' o( r" {
end
/ ^4 Q- p) ?% A0 e! Fto eat-grass: C; S1 x) W2 n0 ^1 L' V- X$ B s0 Q- U
ask turtles [2 l; E" B d6 R* B4 R0 H5 I9 e
if pcolor = green [0 n, W/ U: U2 u' m# w+ ~4 [
set pcolor black: G: C4 C/ `) p; q
set energy (energy + 10)
, O/ n- w u% T4 G d5 O ]
, |1 x1 `- S& @' n ifelse show-energy?% }) Z6 k8 b6 k
[ set label energy ]- S6 U# r/ o+ \8 \
[ set label "" ]# |, L( m+ n. C
]
6 s: z- C' W0 C4 S1 @- tend3 P% K; g6 G# Q
to reproduce
, z6 f$ J; E3 @9 v2 b* E8 a ask turtles [8 E* v. k. ~4 c
if energy > 50 [
. `- D9 b4 L; k/ M! K5 D+ ^ set energy energy - 50
* `. Y5 K& v H5 b V9 ? hatch 1 [ set energy 50 ]
% I3 v/ E2 ]7 g) x8 W# R) L ]" g9 L& x4 g3 A% W1 n/ `
]
! A- `1 z! ]7 X+ J- {. Jend
. a) @# V- }2 T* w% n4 {to check-death* X O/ @1 f8 B& Y$ T
ask turtles [
3 ?0 D5 w1 @$ | if energy <= 0 [ die ]
: p! P! W' s, _" q } ]
6 [; O( @0 l' Yend& W: G0 \# c9 }3 \( P
to regrow-grass
9 r6 t7 f* @8 I! _9 z ask patches [
: A; l. p$ o$ W; X if random 100 < 3 [ set pcolor green ]
z0 U+ J0 X9 a! r ]
. p. O6 d- H- ^/ v4 Vend$ m/ N. `3 ?: d$ k4 G A
to do-plots
$ ?, S0 \& b. E# w, ~ set-current-plot "Totals"
6 r4 {5 V" g( w set-current-plot-pen "turtles"
2 F' t, T p6 _4 w3 }! X plot count turtles
+ ]1 S1 e0 r/ c% X) k( V. v set-current-plot-pen "grass"
7 [6 s: t" x/ z P, Z* ?7 k. O plot count patches with [pcolor = green]$ O. ^! G5 F& u/ w# R
end* c0 u( _9 {4 V( H: l# U6 ]" }
可是运行时提示no such plot: "Totals"/ m& W1 h) C3 Y9 F
error while observer running SET-CURRENT-PLOT, L" U! T% I1 A, c" e
called by procedure DO-PLOTS
/ ?3 {+ e' i( k called by procedure SETUP: Q; S" ~2 W& Z; _: Y
called by 按钮 'setup'
* v/ ]4 [$ O5 r& S求大神解答啊 |