我编的程序如下turtles-own [energy]; Q0 s) I) D) z
to setup+ E6 n9 C+ h# ~0 K4 f0 A
clear-all
l5 a1 U! q+ a" j2 Z3 W2 R setup-patches( O& p" t! v$ Y5 z: Z- B
create-turtles 100
" Z/ h* F* E. c2 i- X+ J do-plots @$ }8 Q1 }' \6 c: {
ask turtles [ setxy random-xcor random-ycor ]
3 b5 Y0 ]! Z! l4 ?- |" ^2 zend
7 |4 [7 C+ Y2 G( `& Yto go. F4 r- e0 `0 f/ b
move-turtles
9 V2 I3 G* x3 S# c/ }( Z eat-grass
( U |+ U. L8 f& C! o reproduce" F' `3 g5 ?( ^$ }4 U9 h% a) c
check-death' B6 B8 T; ? x: a
regrow-grass' A; [, I8 h& j
do-plots* J5 M9 D' `, o& d# g* W% g3 c$ ~
end( \/ ^: \% R! n
to move-turtles
! e9 z* G1 j9 C6 f# z7 t ask turtles [
5 I! Q- V7 F" L7 D i) n0 \3 Q right random 360; b$ R$ V1 S9 T3 u
forward 1
3 Z! K: t: ]1 `2 ]# N. Y. x set energy energy - 1
: i+ @; \* p$ A* g- F ]) U% a1 H7 M2 h+ t; c) g
end Y) t# D( F$ \; l- L1 M
to setup-patches5 ~2 X. y" x, y" D
ask patches [ set pcolor green ]$ M1 M7 ^- @; h2 B
end1 I9 U; m4 b* I
to setup-turtles' \; J. E. Y/ k. f2 W
create-turtles 100
1 D, ]& T- f1 |! @3 A; j ask turtles [ setxy random-xcor random-ycor ]
9 P6 d) q0 k3 j9 O; r+ y" jend
: P4 q; G; O, E/ m ?4 j( i/ bto eat-grass' u6 e0 v# v4 ]/ T/ s) ?
ask turtles [& w F& }6 y2 @. Q, a
if pcolor = green [
, U$ _6 H9 F& O/ j' n5 B set pcolor black
7 L$ r- s8 d5 A# S7 x: h set energy (energy + 10)
7 m$ c& W$ f: R0 c9 y ]
) a' U7 {" k# L7 U u ifelse show-energy?
% X( H( M9 z6 Y [ set label energy ]( V' f1 z2 `7 X; c8 v. _) S
[ set label "" ]) }, Z- H' s" w! s, d
]8 K! C7 z" t0 M0 ~
end
& ^% I2 T. K% q2 Y7 ^to reproduce
; A; x# l2 D& F9 A ask turtles [. f0 s( }& E; }' r
if energy > 50 [: ]* T1 [5 n+ B. S; g
set energy energy - 50
8 e; V: Y8 x0 |4 y( F hatch 1 [ set energy 50 ]& j. p- D8 {; t$ l; [$ i7 l( F* q
]2 i! F: u5 c- J% Y
], {1 C& N u! ?$ X( q! @6 C
end( j; v" Q1 K% i# t8 R; U& [; W
to check-death
% N4 D5 O! [7 ?: s ask turtles [
' i1 P6 A" m- [1 z if energy <= 0 [ die ]
7 C' k4 @3 o2 z4 m' b" U ]
$ x3 i% G7 f& v. p, Aend, p1 `+ m \( \' K+ f: k$ Y
to regrow-grass! M" O3 I/ O: |3 S* b
ask patches [" V% F" [* k' q' F1 u( {' K
if random 100 < 3 [ set pcolor green ]; K: ~# @& @: s) k3 \0 ~; G
]
$ v) @6 V6 W9 g Tend4 g, c" O( f( l
to do-plots
7 A0 b% F) d; p* A* D" G set-current-plot "Totals"5 @/ v3 w# J# b* T& `! e# s0 @
set-current-plot-pen "turtles"% B' i, k, I( x& K
plot count turtles) z0 ?; r1 L8 M- @& ~& u C0 v
set-current-plot-pen "grass"3 @4 v6 j9 H* F
plot count patches with [pcolor = green]5 d$ F" M8 l5 F. u, k! Y
end4 U5 D& q R. N% G6 k c
可是运行时提示no such plot: "Totals"
" ?! l" m% x& E5 a. V: T3 b" Yerror while observer running SET-CURRENT-PLOT
) Z0 r2 g* H: X8 w called by procedure DO-PLOTS
! i& _9 | b8 R3 S" O called by procedure SETUP
+ _( B% B! q: \4 G" P3 H, G# f, q called by 按钮 'setup' h2 S5 O/ w. |" W. X/ M
求大神解答啊 |