我编的程序如下turtles-own [energy]7 I+ u# `" W! X1 Y
to setup# d! W7 c( c# ^9 j% h; ?" U7 t
clear-all, }' u0 h' w9 u
setup-patches0 Y: s; V& \" L4 Q% m. K* I* B
create-turtles 100
J7 z0 D, k7 k# k" k, w0 ? do-plots
0 |: Y; S% V0 r ask turtles [ setxy random-xcor random-ycor ]/ j1 b# y2 p/ T
end
}9 f" x/ R2 E5 ~9 N# |to go
/ I# Q+ k T) ]3 a5 a: @+ d move-turtles
9 i& x# _4 I; x3 Y% W* ~ eat-grass" F; m: w6 `; S* g# B4 I8 `
reproduce* f9 j4 t0 V9 H' r$ Q" R
check-death( R$ Q. e& Q8 ]% V* P
regrow-grass
+ C% B7 h- {9 t( B0 V; P do-plots
: m2 c3 [5 Z% {- `9 k& mend1 `+ N* \$ @" N0 w
to move-turtles
f% C: o; d: k ask turtles [
5 y- l8 y f. i( z right random 360" s3 _& z: k+ \ z: M- z
forward 14 {1 D. ]4 U1 H* O6 i( H. W6 `
set energy energy - 1
) d t2 Y Y3 C) L- N9 E0 f# C ]
R+ ~; L) M* rend* W2 l) f' o" P. O
to setup-patches Y }( Z! l' |- b+ H) F
ask patches [ set pcolor green ]6 P- i" U/ w3 J8 q. P! E
end
7 G) N- v4 f- G& @. Y, G0 _# {! R& x; Yto setup-turtles a4 w/ [4 P* L/ f) L
create-turtles 100
0 k; J6 [3 b/ A- |6 H4 X ask turtles [ setxy random-xcor random-ycor ]
- a8 h9 o8 }% w) O: q$ uend4 N# w# e9 h r. V7 p" j1 D/ T3 P4 U
to eat-grass
) a! s# Y: p2 w ask turtles [
, Q) c! O# Z0 A- B! R if pcolor = green [+ b% \8 E% Y; W( b6 \6 M4 h
set pcolor black3 |" Q( ~1 D0 Y% W+ T N
set energy (energy + 10)
, {8 |' A7 }/ }" ^5 { ]
. X! g; b+ W" a6 d d( O. c ifelse show-energy?# q5 S( F! Y1 C0 C
[ set label energy ]
# _" I1 F2 D2 T' O9 y [ set label "" ]
2 d. X. l, {3 a( E ]2 [/ O: {; C3 q3 I( Z( v9 P! l
end
6 }3 @$ B" f: e% Z* c* D% k$ p$ ]to reproduce4 ^7 ]6 N5 \/ g' V) }" q6 Y
ask turtles [5 v! G8 o* U6 u. u1 |/ o6 V& U$ u
if energy > 50 [
9 ]1 C+ o2 o6 V h& e set energy energy - 50
, A8 P2 V" I# S) p+ ~& V, V hatch 1 [ set energy 50 ] V" A# a: z' A. O
]+ J8 I& y4 Q4 r( ] n
]
% x2 I. g1 M" Q! ~1 m- t, E/ Tend0 w$ |: h. o% B; _
to check-death. p% L4 y: @8 W, ]3 g% w
ask turtles [9 I) r2 k% {$ W9 J4 l1 O
if energy <= 0 [ die ]
+ Q" M% X% Q7 D8 t ]2 g+ y5 {' g" @: Q1 `. v
end
4 K5 m; S$ y. s$ K4 w ?to regrow-grass% R6 z" B. b6 v4 T7 q
ask patches [
/ r9 ~0 z* h0 H) x( G# \ if random 100 < 3 [ set pcolor green ]; ]9 A3 q; h1 e9 C% [
]1 ]4 L: z# v/ p# R* U0 M" S
end
2 W! T- E P5 c8 h# _6 u2 oto do-plots r4 {6 h' H% c4 ?$ c2 f7 i; Q
set-current-plot "Totals"
! i' p2 ?# d6 q7 u+ P9 v4 U7 ~ set-current-plot-pen "turtles"4 T0 c9 f& }; Y( n8 ?2 d+ |, J3 }
plot count turtles
* m3 N) I0 n/ n- t' j( Z9 ` set-current-plot-pen "grass"
# e# b" \" j, v4 c4 _; E7 B' [' X plot count patches with [pcolor = green]
9 e0 l/ E R6 v, }end2 c3 g7 l: K' y6 o9 e! y$ C
可是运行时提示no such plot: "Totals"4 i% A, `, ^7 M
error while observer running SET-CURRENT-PLOT5 q% H+ X k; [" X- h2 K9 z" q
called by procedure DO-PLOTS y& ]1 @- B7 A' |3 Q
called by procedure SETUP
3 u4 r) c1 p" Y# M3 n called by 按钮 'setup'* `/ @. [5 }) J
求大神解答啊 |