我编的程序如下turtles-own [energy]) M& _ v$ p* ?& O
to setup2 p7 k" b1 x& `, y; M
clear-all
- t4 K; d9 d; s+ P y ` setup-patches
! k$ ~& I& _7 x create-turtles 100: I" A' S$ c- C3 l+ X$ Z
do-plots
6 J" r$ ]' @. S4 {) U- j ask turtles [ setxy random-xcor random-ycor ]# \# Z3 N% ^ J7 {5 Z8 Z, ^
end
7 f' ?) C5 k- I! Qto go4 `/ z% O; c7 ?0 P) {
move-turtles3 Z v/ I9 u7 B4 a |
eat-grass5 j8 `6 a, ?8 I7 t6 y- A' h
reproduce
+ p7 k. R! x% T5 g1 m check-death
! w6 y+ ]2 n( v# a8 ~# x/ G3 _ regrow-grass
4 h. c# x2 v! R! j do-plots
9 Q7 f0 { N- B/ n$ cend4 G1 _4 \3 W7 O; D, ?" J/ C2 z
to move-turtles
y }/ M8 s" w3 Z ask turtles [
^5 S3 K8 r9 Z# M! k0 P0 P+ x right random 360
) t# w d% W: O9 i: m forward 1
6 a1 T" ?% A9 u# l set energy energy - 1! @; {% g, I! M- _" Y
]
+ }4 s( {* n9 c. Tend
/ I! q- K% l; A8 g% b# Ato setup-patches
( X/ O9 z+ W% l4 N6 Q# ~ ask patches [ set pcolor green ]% t( _# e3 E" x$ x3 B. C
end
. ]6 B" @* {* ~9 U% E8 c lto setup-turtles+ ?( X" V- f# k) {' o- B- M
create-turtles 1000 H3 I! {- G2 x# g) q* l# }
ask turtles [ setxy random-xcor random-ycor ]
3 {5 c! l; B4 T$ R4 fend6 t9 o3 z# L! o# g( t# K0 b& Z
to eat-grass
6 B% n0 [$ o3 m3 } ask turtles [0 a( ?5 g) h% A+ m! U3 E9 G$ n1 V
if pcolor = green [) d! k, h$ j; \5 B2 J& v
set pcolor black
* W3 e4 ?0 W0 x3 }! S0 j. ?2 M set energy (energy + 10)$ L) i4 F0 O# B6 p0 k0 T! `9 |: {
]! ?# R; H: @2 D4 J' |
ifelse show-energy?
$ c) q4 l+ }, d& Q [ set label energy ]$ |/ t6 d! `$ \" H) p( {
[ set label "" ]
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end
, W; L/ d8 E. n$ X; _/ tto reproduce& G9 |8 v( E1 t) n
ask turtles [# r; T: I( T8 q$ B
if energy > 50 [
5 H6 g# v" m) g# h5 M) \ set energy energy - 50/ Y O0 Q$ \) ]# m1 Z3 _
hatch 1 [ set energy 50 ]' B/ O5 M W; Q6 O7 P- g
]# h2 S9 O1 ^5 D: N
]! B+ V, H$ [, a3 c9 P3 E) h# T6 O' R
end: y& K B5 I0 [$ X
to check-death
. S8 _: Q4 W1 q( ^3 d0 ^% ~9 V ask turtles [
* t9 h" w" Q) f* u9 @. K. g if energy <= 0 [ die ]
8 ?: n6 z b: ^ p7 J ]3 E( ~" u$ o6 D
end: d8 X1 ~1 c$ i' W% Y
to regrow-grass
9 L1 @: ^, ]/ n" U( u$ s, e ask patches [6 S' O, V1 G7 G1 W9 c
if random 100 < 3 [ set pcolor green ]
. c/ Y" s3 O0 b: T ]" Y; ^! X% `. Z8 m1 s
end0 q2 N1 }7 @) j% t
to do-plots, J, _! p' \( x& T M1 F
set-current-plot "Totals"; m. j0 O0 g; j
set-current-plot-pen "turtles"0 K+ p/ l" w) f/ s- a9 G& w$ Y
plot count turtles0 s& ]6 s `" Y
set-current-plot-pen "grass"
! c% w' N" ]5 D1 B6 P6 W plot count patches with [pcolor = green]
! {- x- Q# @- G2 k: A3 Q5 Uend! E* E% F; w8 A- t, C1 A
可是运行时提示no such plot: "Totals"2 E X" r7 s; I& G# U& H
error while observer running SET-CURRENT-PLOT
1 m6 a6 g9 ?2 |4 U8 E0 v called by procedure DO-PLOTS8 h' b5 S8 q' b8 [3 D
called by procedure SETUP
0 B9 A2 o! T( D: | called by 按钮 'setup'* G( y- i0 t6 k6 H: f" V( D3 a% q
求大神解答啊 |