我编的程序如下turtles-own [energy]# X$ ]1 ^2 r1 J/ l: n0 b/ K
to setup% A7 M7 S# n6 \
clear-all% f2 \* b4 b1 j
setup-patches" R. X: X5 P T) V
create-turtles 100. D4 `2 G+ {& ?7 I X
do-plots
% j1 H5 k9 [) A$ w+ c* S* F ask turtles [ setxy random-xcor random-ycor ]: N2 V+ O2 o; e% L* Y
end0 o0 p, Q9 t- I, [6 f
to go: K7 o1 M$ n9 }# K0 [- a
move-turtles; A" Q- `9 r& S% i! i9 i
eat-grass
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check-death
/ g |' Y4 f% V' f; _0 k% G regrow-grass2 U1 W9 I$ U b3 m/ [
do-plots
: Y, V. _3 X; w Pend. B0 D4 ]9 n6 a7 K5 _
to move-turtles; M9 g9 q9 U+ k' Y6 y0 S. e% q! H
ask turtles [
, ]9 q' X! d, W' v5 l4 Y& i right random 360+ i: F6 u, i# v2 _9 `
forward 1
( a- E @; W4 R8 `6 D" x set energy energy - 1: M! a C+ J, l% F4 r+ P
]3 |6 a5 S9 ?+ G4 j0 d" O) l5 C& E
end
& t$ m# }/ c8 h d3 n! t. lto setup-patches
M. `: u# L! ~3 B; M7 J8 L ask patches [ set pcolor green ]
; B; [/ S( J' R, T1 S& \end. H, z6 v4 v+ n; i
to setup-turtles: n- s6 V& _8 O) q0 [# E' g
create-turtles 100
( F' l5 [) W- U0 o ask turtles [ setxy random-xcor random-ycor ]( j$ j$ Y' `5 E& s
end" t; e; c. m9 ~& ?
to eat-grass4 g- u* q4 V4 M6 Q2 w( w8 I
ask turtles [+ r3 X$ [! Q- I8 ^. V6 u
if pcolor = green [
# Y4 Z6 d6 M F" d$ W" k5 E. J set pcolor black2 V7 M7 v2 O) H! I
set energy (energy + 10)
% A4 p- o& J- B) S ]
- j: J* W, J4 W( i' ? ifelse show-energy?
# a$ j4 X$ D9 ?; ]7 [9 X3 l: F [ set label energy ]
6 n. w# [& _1 P& `1 t7 ]" T [ set label "" ]
9 L+ L9 c# `7 h0 }) O) @; t2 U5 [ ]
4 X' c: j: i' W- x; E' ~end4 Z( Q0 a, T5 v% ^5 W
to reproduce
1 U4 s9 Q+ d0 k5 r# \& S7 I0 x ask turtles [
% f0 |$ {& r) f. f% n: o; a' ^5 T: ] if energy > 50 [
z f$ z, L' t set energy energy - 50
2 D, y n% ?- a/ d) ?0 Y E8 g hatch 1 [ set energy 50 ]9 H" H: C; C9 r9 h# e q9 D
]
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end
" n/ s$ z. Y: Y. H9 q* `to check-death
' {, l& g, o! E+ U j ask turtles [
1 ~7 m% V: t4 T3 b" E if energy <= 0 [ die ]
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end
7 r* ^1 g0 t; b* V: \: ato regrow-grass3 s8 W$ q' V+ G; P7 d* W. |' i7 R
ask patches [! I* u# z# S2 @( U
if random 100 < 3 [ set pcolor green ]
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end, m" U) u& s+ \+ Z, @( W
to do-plots
+ y' i# [. u- ] set-current-plot "Totals"
3 b) _$ W$ E+ L4 _+ R) j# g set-current-plot-pen "turtles"1 U* f' X$ ~# V- @
plot count turtles# `- X. B8 S* W3 Z( b
set-current-plot-pen "grass" @+ E% [7 _) F! F9 k2 `! n
plot count patches with [pcolor = green]
5 n- X8 E- S7 I" z5 O' c+ gend
d _' p2 s, u8 |3 z可是运行时提示no such plot: "Totals"9 z+ g% e* b4 Y
error while observer running SET-CURRENT-PLOT; L5 |# K/ r3 O6 X# T' `2 W
called by procedure DO-PLOTS, ] c2 {2 r0 k F2 _
called by procedure SETUP
: n2 {3 F( B6 E8 c; I called by 按钮 'setup'
9 ~$ L% b5 z' i4 O& G1 ~0 K K8 `7 z求大神解答啊 |