我编的程序如下turtles-own [energy]
" v S* @8 {2 bto setup
! J2 ?: n' P- m$ O- f1 i clear-all
# X/ y0 v0 g" G7 k- K6 e: { setup-patches2 _! _5 u% p4 V, ?
create-turtles 1001 K3 C) [/ J3 }$ T3 b+ X
do-plots/ u. E7 w6 _% I7 \
ask turtles [ setxy random-xcor random-ycor ]
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to go+ A! G6 B- y- H7 U
move-turtles" g5 e q9 V3 J M8 E
eat-grass8 u% L1 H/ m7 H1 n% [
reproduce
3 x' k) w% `: O& W* b- ~ check-death
2 A8 w8 m* a, T: z( | u" m regrow-grass
# Z( k, Y! X7 A do-plots' t; }+ w9 H! s6 N
end
0 n7 G+ h0 b: R- [4 X9 A4 Hto move-turtles+ p2 e6 d! G, U6 H
ask turtles [
* s" i$ Z( {; f6 e right random 360
8 b# D7 a6 g# v& _ F0 ^ forward 1
5 J9 R) e" k, L8 X/ M- x P set energy energy - 1
' X- h5 ^5 D1 Y& f/ Z ]
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to setup-patches
' J2 ]4 O7 ~5 {3 V, S. [" f6 O ask patches [ set pcolor green ]( h% ~7 S* M: s6 F, O/ Y
end
; y$ k# K2 a1 F9 Rto setup-turtles4 A! W/ P. f/ c3 e+ T4 X
create-turtles 100; |; @7 \! l4 W9 p4 p5 ^
ask turtles [ setxy random-xcor random-ycor ]5 u" [6 b1 ?/ _3 ^2 N$ J
end e8 D$ O% W# {# s+ _2 u3 y
to eat-grass
, U2 w( V# Q3 ? ask turtles [3 f( N: @1 V0 X' t, u
if pcolor = green [
. ~+ z# u; x0 @: |! |4 _3 ]9 t set pcolor black U/ |3 Q( e' H p
set energy (energy + 10)
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ifelse show-energy?: D# i& y, Q: X3 o; j' M
[ set label energy ]
1 ?; F: W+ B) f% l1 Y3 y6 m# S4 j [ set label "" ]
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. ]7 S4 g6 ]5 ^# \# cend' {6 A) i6 H5 H2 W8 G: S
to reproduce
7 R# ?. T# U' _$ C: x1 ] ask turtles [
' O/ ^5 @, U8 Z6 |3 A if energy > 50 [
* X" s' ]; s4 ]1 f* ~! W0 ] set energy energy - 50; t2 ^' @( G( r' c
hatch 1 [ set energy 50 ]
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]1 Q5 y) ~( {8 v, n
end9 Y; ^9 Z0 ?4 M$ ] _. H# E
to check-death5 h S4 c* x7 h# L' }3 }: n7 N
ask turtles [
0 s7 h2 D- k) p3 P if energy <= 0 [ die ]
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end
# J z# _& p, u& q( sto regrow-grass% [9 J+ o# o p- _
ask patches [7 i( K# R3 F1 u* A
if random 100 < 3 [ set pcolor green ]
4 E$ X: K- r9 k9 Y( Q ]
2 [ g7 ?3 z0 oend
: b7 U& L8 k8 N* rto do-plots
$ [& N, W0 j3 Q% S- d; h. u! A# D' ? set-current-plot "Totals"
5 w! g( K. h/ C, R# q; g S/ b set-current-plot-pen "turtles"
7 Z N. r& e* [5 I9 H plot count turtles- ?- U7 ?1 Z# i5 d3 m( [
set-current-plot-pen "grass"& O# C/ A2 A2 a, F9 W: f
plot count patches with [pcolor = green]8 y4 s% D; D* o1 \
end. L) u' N9 b$ U- e; B- p" a3 a( i
可是运行时提示no such plot: "Totals"
0 D& i8 h2 {5 J2 M5 Merror while observer running SET-CURRENT-PLOT
- i- v# S( `% a# j called by procedure DO-PLOTS
2 Z7 d: p* D' k9 Y; v' `# ^ called by procedure SETUP' I. `/ H. f1 a4 l# P
called by 按钮 'setup'
+ H8 \9 ^' {7 J& n# L C6 W5 n求大神解答啊 |