我编的程序如下turtles-own [energy]
5 x& ~/ W" l8 z1 E$ F/ R0 ^to setup5 F& ^- T0 y$ k9 U# c/ |; a* H
clear-all- c5 o( O6 E/ h. Q$ W
setup-patches" R! k4 j( H, i8 M& N. d
create-turtles 1007 }1 c% X. L$ x/ n* I6 L
do-plots4 p* E! P0 \% b3 z2 F! B( F
ask turtles [ setxy random-xcor random-ycor ]4 @* _- C, j& X7 s4 B
end
( \3 G# H" [4 ~! ?to go9 \6 y% z7 a5 _( |3 o# k
move-turtles h7 G& r5 t; r4 H
eat-grass
+ }/ @8 H6 ?3 E6 U _ reproduce$ H+ u/ p f0 B! W0 b% g7 d
check-death- U7 M" ^! L' c
regrow-grass
2 ]9 v* }! n5 f- a5 V do-plots1 s8 u0 a6 F: K" V4 W
end
1 Y; ]4 n* s! P0 w. Uto move-turtles- u- \$ j- w3 K2 r( V
ask turtles [
# Z8 F. O( b3 v0 F6 ~ right random 360 P+ e1 k" o9 G& g5 p# U l# f% L
forward 1
( A* t5 L* j! @/ o5 M& u& i. X+ E set energy energy - 19 A( W& x/ @- f7 {; ]- \) k" e
]
& k1 x: {& _5 u8 r' aend& r# }" _0 |* M7 V7 q; J" ]
to setup-patches
; ~% |. Y! l+ d3 Y: G: n ask patches [ set pcolor green ]
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to setup-turtles- S& O1 _. |2 d* O
create-turtles 100( t8 L: q5 }, O# k w
ask turtles [ setxy random-xcor random-ycor ]6 e6 ?, [ o# {
end
. `! S Y9 O/ q8 @# c8 H* z& b! \to eat-grass
9 i; v1 m( |* q$ e& }/ W ask turtles [+ _4 O2 `4 g$ v& ], B/ V
if pcolor = green [
& f6 p9 h% [4 P& e' H; [ set pcolor black; C$ A7 n9 [2 ?: Y
set energy (energy + 10)
2 `1 [& ~6 A% Q( ~& H7 Z ]
2 {! {. _: k9 w6 ?% ] ifelse show-energy?: b) A- v" M0 S6 L
[ set label energy ]8 C! d, W# l* s+ {# Z
[ set label "" ]
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end
0 h- p0 @" o6 S5 y/ Ito reproduce
! H9 W+ C7 V$ t- o! x1 D3 \' W7 b ask turtles [( r! ^% ^: u5 q$ Z7 X( I6 Y
if energy > 50 [4 b+ e; N S1 k0 Q" E8 N
set energy energy - 500 }9 t. {) o I! M5 z
hatch 1 [ set energy 50 ]
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% j9 D7 {3 [& s1 A/ H% Pend$ l b3 u; k" @# D
to check-death
4 W8 T4 ]7 P/ P2 r ask turtles [' `1 \& j+ C# W; j
if energy <= 0 [ die ]0 ]% X5 {7 S: i1 ~
]
$ p) |; W+ t2 m& Nend
1 g/ F/ b3 m! u, Z3 nto regrow-grass
" v/ y6 C2 ~; h ask patches [, l# I2 v. \4 y" q- U$ f
if random 100 < 3 [ set pcolor green ]
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end; a+ d8 k8 y- g7 B: v( f
to do-plots
# f& a2 q# T [1 h# K- Z! M+ E$ g. x set-current-plot "Totals"
: a1 G7 R- r& w set-current-plot-pen "turtles"- e$ d) x- m! }9 w: t- n
plot count turtles
, C' l4 }$ j# g: c5 |" M) Y set-current-plot-pen "grass"
& Z5 M0 D# R9 ?: I plot count patches with [pcolor = green]" T6 x N, \% a
end
8 g/ D. e! |$ J2 h7 T可是运行时提示no such plot: "Totals"" U& ^6 Q6 A7 S
error while observer running SET-CURRENT-PLOT
- X8 K' G5 U/ W& n% C& o called by procedure DO-PLOTS
7 T5 g1 w9 w9 Y, }' k5 g called by procedure SETUP- a& o" z: J `4 j
called by 按钮 'setup') [' v# w E4 k# l; E% }# y* O
求大神解答啊 |