我编的程序如下turtles-own [energy]2 F8 a! ~, E% s4 z [' A1 }! g8 J
to setup
5 u# n, d: B6 s3 Q- D clear-all% `/ u5 o3 U# C! R O
setup-patches
8 B6 o6 r! t& g) Q& C. l9 ^ create-turtles 100
8 G; N2 Q9 {6 q do-plots7 g- { q$ J+ G( X
ask turtles [ setxy random-xcor random-ycor ]
; Q" L- j' E ]2 e9 s% K2 g4 G1 Pend
6 e( J' u$ M# d- x! d9 Mto go
: E; \! D9 Y( i move-turtles
9 d/ M6 V6 ?7 d0 L- T eat-grass
' g) d; n0 t& ?7 k7 J reproduce
}$ h8 m$ x) r3 G$ ?( T check-death6 _- G, Q$ M9 U: }1 [2 J: c
regrow-grass5 T# K3 ]+ [& c9 H' \' K
do-plots& K# ~! X6 u; X2 d4 L3 o# Q
end9 a5 @/ P# z# m
to move-turtles
9 w) X7 G" t6 W+ I+ T' x ask turtles [
' E" D# j6 R* x6 @; A right random 360
% T. F o. s* m' S( R forward 1( }5 i( Z! T' ^* z
set energy energy - 1
f/ g( `/ e- s8 r ]
" }2 O( w9 g; E( v5 ]5 [end
& K. R, g9 C2 C' z* c" i# Q. Sto setup-patches9 |* O8 |) H; a. D/ b
ask patches [ set pcolor green ]
7 M( l, `5 ~7 P/ R; Aend
/ E1 N+ ?- u X2 T" ?/ y/ [to setup-turtles$ T7 g/ J$ |( t+ ^4 |+ B: `
create-turtles 1003 B& z, k. q( p# q6 N' j8 P% M- a
ask turtles [ setxy random-xcor random-ycor ]& D! s5 Q; C/ x& G. N9 U
end
: D& p! p+ a# ?0 ^6 Y o. g, Pto eat-grass
; H3 C! A+ `+ ]0 O' U ask turtles [) U5 x" b+ Y/ g* Z. P5 [, g: X
if pcolor = green [: k; I& Z$ k p9 s5 e- X6 ]
set pcolor black9 V7 p) A. Q9 O6 ~
set energy (energy + 10)2 u1 G1 e! Y! Z a0 G5 f& L2 j; N
]! t0 T: i* l0 q/ S% K: o
ifelse show-energy?# ]6 E2 [+ r0 y5 C$ ~* ~
[ set label energy ]& x: p& g) f1 F
[ set label "" ]
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end q! Q6 q. i% p; x* c' X
to reproduce
$ ^& R# y% A7 m: Y# \% i ask turtles [
/ x0 @3 }% {. [( ^( r if energy > 50 [
# e- U, T+ }' T9 E set energy energy - 50- I P- O) F8 d M7 V
hatch 1 [ set energy 50 ]4 E& [$ Z( q# s- C( V% F
]
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end
. h, ]% w0 G* K, s5 R4 Jto check-death
4 ]$ E0 R& ~8 S ask turtles [
6 n. e3 t# X& ?- [4 ` if energy <= 0 [ die ]! z- @( Q5 F& e. I
]: c7 [3 b3 V6 J# @( I) x; b# n1 e
end8 |% d; f* z2 F- l3 G8 p
to regrow-grass# E& L# p$ l' o! b# C/ o7 ^, h
ask patches [
; t! n/ s" y- ?1 r& z \2 d if random 100 < 3 [ set pcolor green ]
N. s; V y. s- \/ D: |4 g ]9 m0 t6 Q# w4 a/ l& ?# D; q
end) f& a. U0 j6 {2 w1 w% L# a
to do-plots0 d/ i2 o5 a4 h( ~1 t. i# a
set-current-plot "Totals"- r5 u$ Y+ h2 y" ^+ Y9 @
set-current-plot-pen "turtles"
' q. V( _8 c* e% o plot count turtles
5 e- T3 g) o K% ^& P: ?. L, D9 w set-current-plot-pen "grass"
, `9 n- \& m% O' I2 L& T/ A" G plot count patches with [pcolor = green]
8 u- w9 W0 M5 Q+ X5 |end
3 T" c3 p: b6 Z1 k- @! v; N* ?& l可是运行时提示no such plot: "Totals"7 e) Y: n3 W9 i2 f+ P p
error while observer running SET-CURRENT-PLOT
/ m1 V5 K6 a8 }7 u+ F' H called by procedure DO-PLOTS2 K3 _( X: M) P9 M
called by procedure SETUP
& z* _* n" I* f3 ]. L% X called by 按钮 'setup'
+ L3 }! R% m1 L: F3 C8 n. s7 u+ x+ _求大神解答啊 |