我编的程序如下turtles-own [energy]/ G# A$ H# y$ K2 s2 @
to setup
' D& c0 p8 W* @, I8 i5 M; W3 c clear-all* x- U5 c5 S, R- U2 ^) V9 E! x
setup-patches
# @6 ^+ p& k0 V, y- O create-turtles 100
0 Y: I& U- E2 y3 t do-plots6 ~# H7 K+ d; s
ask turtles [ setxy random-xcor random-ycor ]
% T8 Z. f+ F, O4 x/ B' U! l0 `' E# Yend2 Y2 b7 p( e! q" O
to go/ G. v% R7 ?5 k$ V5 r0 f
move-turtles
* s( \ z% L F4 m1 s- ~ eat-grass
1 v9 `; C4 o. s& a7 N- Q: [/ M reproduce$ s( M1 y9 v/ t/ F5 J# Q v
check-death
4 [: W2 V- z& Z; o5 s5 A B regrow-grass
; V; _! Q9 C# _ do-plots
5 l" B. H2 m$ }: W2 A9 W! m1 P, r& nend
- x9 k( s# u2 h& I( i" |to move-turtles
- L6 v4 U& ?5 ^, C6 v ask turtles [
y4 G; P" R5 f3 V0 I4 } right random 360
1 Z( n+ Y3 t% f' b- t1 ]1 d forward 1 p. s# n8 t4 u* M
set energy energy - 1
g+ A4 U2 v( R4 v1 [* V N ]5 T3 S9 }4 g" Y: Z7 s8 z v; m5 n
end
; Z+ m% k+ y9 H& vto setup-patches
, }" Z; E7 z/ h! n: n6 h ask patches [ set pcolor green ]
& Z" e9 e) V+ J: y' lend
0 q$ V9 C% g; s! r: X2 Oto setup-turtles
/ l, \, R5 ^( R: v3 ~+ p create-turtles 100
* P! d. r3 o+ g: F2 M ask turtles [ setxy random-xcor random-ycor ]: K3 Q2 n0 {! _. G3 T
end
1 J2 e! H4 C4 Q3 w6 z8 i! D5 Wto eat-grass: i- k' d/ _* f) V
ask turtles [
4 ~5 w/ O1 P* t& R5 t1 M if pcolor = green [- ]. ]) C J* L4 {' R
set pcolor black3 t s0 Q$ d3 e) g! Z* j9 P
set energy (energy + 10)
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ifelse show-energy?
& e* c9 k0 i7 e. _; E [ set label energy ]
# K0 J6 Z/ M2 d+ L2 B/ z [ set label "" ] X' J5 I; x, j7 X% s
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end8 z0 ~7 T' |+ u7 l
to reproduce% z4 S; `8 A: C6 ?1 ?! _1 ^, Z
ask turtles [
7 X3 G8 _1 J% q' @- F if energy > 50 [
; B2 M9 P! Y% z* n2 M y set energy energy - 50
! V8 ?; ^+ _& x# Y9 v( j( ] hatch 1 [ set energy 50 ]
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]; ^) E3 u8 V- \+ j
end& h/ j" ~( U. ^
to check-death
) f6 h+ j. V: V2 A- N7 K ask turtles [
4 H1 m! e* _' o2 ~$ X: E/ Y if energy <= 0 [ die ]
; e! r5 W3 u! z/ ~ ]+ r) t1 [; i) y! O8 l; b3 ?
end
d& n' N( l3 {to regrow-grass# L c: l) s( n3 w3 P
ask patches [- _" j7 h. C' J
if random 100 < 3 [ set pcolor green ]
8 k2 o4 y" `: x$ D ]8 c7 G+ `/ `% i. C3 Q K( H
end9 l) ^* T5 ?) x' Y: j
to do-plots
% C V" y6 T! L; [( P* D1 p set-current-plot "Totals"
0 Z1 \7 j2 {4 t+ K) z& S5 \2 @ set-current-plot-pen "turtles"2 r3 W* M/ |# D
plot count turtles
8 ?0 {7 |' ^1 L+ ]' \ set-current-plot-pen "grass"0 k" u7 c3 I5 R! ~5 Z" z
plot count patches with [pcolor = green]! u- [) V4 ~5 m, A+ r
end
, e" N% b) c5 E6 i2 h) N' c/ x- G可是运行时提示no such plot: "Totals"
& v) C6 Y& [9 i L2 u+ gerror while observer running SET-CURRENT-PLOT5 O' V3 {9 ]: a9 L! o! L
called by procedure DO-PLOTS
2 e+ `, H1 B, O called by procedure SETUP# k. \! t l1 N
called by 按钮 'setup'
! ], J4 ]+ A0 l; W+ S求大神解答啊 |