我编的程序如下turtles-own [energy]
: x' |! S" q0 v8 W% Pto setup
, F2 {+ L1 z/ \/ _* b clear-all4 R. Y6 _ c9 [$ b4 z
setup-patches6 A4 A2 Y9 d6 h
create-turtles 100
, ^ R- a- P6 c# C do-plots( {, Y0 U: v; i& c% R" O& X' W
ask turtles [ setxy random-xcor random-ycor ]0 r6 l# E8 o5 h+ x! T
end2 }/ Z4 {! U' w( q) R* I
to go* C6 w$ g7 b8 c! i
move-turtles
, v3 x% Y$ @! l6 ?6 _2 ~# u eat-grass0 F/ }! z1 n1 a
reproduce
/ y( q, N# [4 d# H% C* I check-death2 K6 ~$ r/ f; b! c; z* T- ~
regrow-grass! B- R$ I) X! u' T) ]% a
do-plots
& |% d+ h# P6 Q9 l4 |5 G0 ?end
8 ]0 F6 Y$ `) U" y7 lto move-turtles; t% \( [/ S: a4 ~8 J, B
ask turtles [" ]8 m- ?' Q! N& z) g
right random 360
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set energy energy - 1$ I+ E# R: L7 I3 b* \
]
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to setup-patches
' x3 w( V1 W- P* g ask patches [ set pcolor green ]/ I2 K! T. L/ s. e( R0 C
end
0 j3 g3 c% R w2 o8 ato setup-turtles0 |8 e- p4 i5 F' r5 ^
create-turtles 100
# b+ d5 I& n. y7 _2 |/ \ ask turtles [ setxy random-xcor random-ycor ]' S% C0 H, R) G8 I1 q- {
end0 s& ~; H3 Z7 }' A/ R- [
to eat-grass: n# |" N' o- B; m' M. a
ask turtles [* T6 \/ m+ z; e9 r
if pcolor = green [2 L5 C m5 V9 |; g2 g: r& O+ |6 ]
set pcolor black# b5 d# B' t$ I, D& A
set energy (energy + 10)' c- Y" l! _4 @+ z& j0 l7 O0 D" Q
]
7 }3 O! L |/ @8 K" Q: W5 A ifelse show-energy?
" N! a; c0 Y6 a [ set label energy ]
1 I& I1 E p0 o8 ? [ set label "" ]: W7 z' w p3 J5 [- Z% u
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end
8 @5 {1 w+ _) p2 _! u4 T* Xto reproduce* r' K+ L# T7 J& E
ask turtles [
. v2 b2 H1 y" O1 G+ G: _ if energy > 50 [
0 P: ~! }- @2 y1 r set energy energy - 50
' o& O' D+ J# K5 }9 ^: w& j$ H hatch 1 [ set energy 50 ]
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]+ K X) L1 a( d ]
end4 r5 n, w. c5 H A U8 I$ Y
to check-death8 F2 D% f) @; @, J7 M+ \- _
ask turtles [& R4 m# S7 y2 s! Z
if energy <= 0 [ die ]
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end
7 V7 S; ~: L' H* C/ d! F+ i* jto regrow-grass
0 {1 b* f8 D! X3 } ask patches [
7 l' B/ N- C* [2 Y& f) G if random 100 < 3 [ set pcolor green ]1 V2 c8 B5 f& D
]
# ]2 X& h* C6 p9 {end. Q2 E/ `8 e* G& A! Q! @. ]
to do-plots+ y, ]4 k" B$ j+ T' X
set-current-plot "Totals"
4 u8 S3 {& y4 |/ k set-current-plot-pen "turtles"* k% w. y; O7 x
plot count turtles) K, i& y$ `* X, E" M! b! S. d: Y
set-current-plot-pen "grass"% I3 P; A& h* m( p2 i) s
plot count patches with [pcolor = green]. [0 f; e, V3 v0 A# l; I
end/ g) U8 T5 K$ a# g/ i3 @: n
可是运行时提示no such plot: "Totals"
# p/ ^$ w2 T5 N. [2 t' k% Berror while observer running SET-CURRENT-PLOT
& R8 B8 c1 i9 ]# Z1 N called by procedure DO-PLOTS. H4 j; d: f- u0 l% m" u7 P% d: Y: n
called by procedure SETUP8 U1 e8 W+ p4 J& h! c) c: M
called by 按钮 'setup'# P$ [) \. V2 h: F* ]- P
求大神解答啊 |