我编的程序如下turtles-own [energy]
9 d# _6 {. h3 R) Y# Zto setup
3 y) C; o1 t: t+ B3 N5 X- l3 [- n! Y clear-all2 S/ J4 P) g/ [" L) ~! p* \+ x3 X% {
setup-patches; X% A. X6 `5 s! V# r
create-turtles 100
2 r! q! ^3 W1 Y$ F do-plots
5 w$ o" B3 z" |/ R, V1 p ask turtles [ setxy random-xcor random-ycor ]
" M7 `) A9 E' V4 ]- }+ t# Aend
( e {+ G& o; ]. Jto go
% i8 C) y" q" ?3 r move-turtles
6 U% d/ I7 f2 V6 R- X eat-grass
) ^" r0 A+ F6 v; O2 ~ r" D reproduce7 s9 W8 |* W) y( T$ [" r. Y
check-death
) k: H, O8 {0 |- o+ p regrow-grass% H* |7 Y6 i" Q6 S
do-plots& ?8 J5 U7 | T" i/ k5 v! `
end1 x$ x4 ?, K- r+ @
to move-turtles5 v+ ^ u y! ?1 f. k' A1 [
ask turtles [! F2 A) f9 |. K) r+ G) v2 U
right random 360
, H( F, R: y2 i forward 1
4 A4 h( ` {) x- [3 c2 ^3 s0 }6 B/ W set energy energy - 1' A, t) q5 ?7 a" m- B* n
]$ Y: A3 i# [1 L
end6 B) P5 E- {6 G, S6 ^2 W
to setup-patches
2 x1 h6 O. @+ x4 `. |7 L$ s$ p ask patches [ set pcolor green ]8 N5 @0 H- l7 ^
end
+ X; B& a: I8 W1 e7 h G: Ito setup-turtles# G$ N* R0 z+ l' l
create-turtles 1000 m @- i/ M x: ]* A
ask turtles [ setxy random-xcor random-ycor ]
4 B0 A% q; v, a% [% W# w6 @end5 _6 w- N% m3 `* t* L d
to eat-grass
1 V: e1 l& X( k% c- _7 M ask turtles [
1 h, H, _+ ]) ]$ M x/ h9 e if pcolor = green [
+ [- z# f6 G) o k set pcolor black
6 \- M1 R, o0 F: R set energy (energy + 10)
- G+ m4 ]. U& Y" L ]
( l A6 W! S7 ?& ^6 N% r ifelse show-energy?# O+ h' H Y' h! M% F! D9 T/ p
[ set label energy ], V& A+ [0 D, I
[ set label "" ]
( Z e* U6 H/ C0 _/ w; \. d ]/ L$ R2 w# P/ d' m. B
end
% P% V z% P' f! ?to reproduce
+ c- v4 ?6 O1 n; Q2 z4 \$ O ask turtles [
, n- e- B; B" c B1 S2 C5 c2 |, R+ s if energy > 50 [
9 S- ~* a1 Y. s( m7 J7 Y set energy energy - 50' R, ?' ^. L0 Y& Z2 `! G. p k
hatch 1 [ set energy 50 ]
2 E# @5 |0 X* Y& _+ Z0 r ]
" E# m" J* v& l1 p" n6 P ]4 t* ^) H, i- y: b
end
% K9 O; z: K5 Qto check-death
# g: D, n7 I+ ~9 @ ask turtles [
7 D0 ]. u2 {# v% p+ i2 f if energy <= 0 [ die ]
- p e/ ]; f( a% @3 a N9 A5 s( R8 w w ]
3 x* i$ t( V1 l6 q, l# C3 {" Mend
: c1 H7 T5 ^/ P. ^to regrow-grass, ^ y+ T5 r" z5 X, _
ask patches [
/ p/ ]3 y' N8 C7 w if random 100 < 3 [ set pcolor green ]& b2 l* C3 j" @2 X& K, z8 k2 F
]
" o- _0 R3 p9 i% {, ^end7 p S7 _6 e8 m7 W4 C
to do-plots, |& s* M- O" ?
set-current-plot "Totals"
2 o0 d: ~/ p# p4 O. n; I( T1 o set-current-plot-pen "turtles"
; a9 ]: H4 j" F. C plot count turtles* J- D5 k* W' G
set-current-plot-pen "grass"
6 ?7 ?) |1 h0 T6 w5 P1 X$ f plot count patches with [pcolor = green]9 s! C+ B# G. ~ `
end/ V6 w5 S0 n6 g6 A% E
可是运行时提示no such plot: "Totals"
& c$ e+ f" b7 aerror while observer running SET-CURRENT-PLOT
$ J7 [6 E! S6 C" b5 J0 A, i# f! L$ H called by procedure DO-PLOTS
& a6 g; c2 \1 X3 S( e+ Y called by procedure SETUP& X& w2 ]. D. X4 K* M( `" q
called by 按钮 'setup'
2 D3 U& J9 e4 l1 O I+ y求大神解答啊 |