我编的程序如下turtles-own [energy]
. Q' Y8 X2 X9 e! c6 a* |2 n% Y# J4 wto setup: M: k- i4 g7 c2 ~' X( I) V' a
clear-all! D) X; q0 I, ^
setup-patches* K! ^" J$ W# e7 m+ B- h
create-turtles 100
$ x9 Q) `. F) s. O9 q$ i do-plots
/ i' ?& S* C; T7 m! B3 b ask turtles [ setxy random-xcor random-ycor ]& V: K% z+ h/ L7 H
end. i: j) `' P8 v/ ]1 o& c
to go, a- K9 c9 I' N6 C& ^" e9 \* y
move-turtles$ h# ?: @# _; C* _6 z
eat-grass- T- A" m) J& S0 z, I
reproduce( n' r- K$ p* t2 N
check-death- i+ A: U1 j3 q7 p/ f! }
regrow-grass
( b4 Y& T1 Z2 T, ] do-plots
; r3 g! C. d; H$ u8 f) B) rend
* K( S0 T. B( _/ d" \4 \$ Wto move-turtles
g7 z5 s4 g/ H6 [ ask turtles [
: c! Z6 W/ \5 b" { right random 360
# n* T1 @& c0 c+ d& _" ]" ^ forward 18 Y- Y/ ~) w# Z
set energy energy - 12 ]6 ~ l8 b* u" n. S4 d; @
]$ _! L1 R4 D4 p# f
end
/ e* | v$ g8 ~' @5 Hto setup-patches
n+ u- S' {7 \( [; u ask patches [ set pcolor green ]
. T* J0 |- ^0 q: aend4 _' \2 g5 V1 I8 V0 B
to setup-turtles
! T- ^% S/ o1 w/ k) t0 A create-turtles 100: b/ Q1 a R9 Q; a: e% ?* p
ask turtles [ setxy random-xcor random-ycor ]+ k( `% }# l' U6 H4 A$ V( g* d$ i
end9 V6 Y$ ^; s* w0 }
to eat-grass
; }- \" G% I5 K- J8 \# e6 `& Z+ c ask turtles [+ |$ E6 y% f4 N& T
if pcolor = green [
) r2 R) T0 V. m, w; ~ set pcolor black+ X3 w1 M# d/ S
set energy (energy + 10)$ x$ I/ ^5 y- [
]
" \9 g$ @7 B5 C- S3 {) B ifelse show-energy?# Z4 H1 E6 A; h0 j
[ set label energy ]
4 p6 T3 L; c1 E: h [ set label "" ]( f; r7 y: p+ R
]
$ ?5 [8 e: L' V( Z* z) ]+ Aend
% ]( y8 u A' C9 R- U( S5 P' {to reproduce
! q! j1 g k" I9 ]/ V7 t5 b ask turtles [" b% I1 |7 }/ w# a1 S
if energy > 50 [
* | U- Y/ ^; E6 b2 {" Z( R set energy energy - 502 }2 i! Z5 R4 q
hatch 1 [ set energy 50 ]
0 N) ?" [+ X- l' m, P1 T1 G9 e ]1 R; v B0 `; H& ?9 N; [4 X0 j
]
9 J& G. O; [# J+ Cend$ X5 \2 l6 `- u! Z5 w- i/ T+ @
to check-death
& X; `, i5 w3 C2 Y. l ask turtles [
! z7 y* q& o6 B, R if energy <= 0 [ die ]+ F4 Y0 o. h: ~" C( B( {( e
], ~8 e/ q' v3 ]3 l$ z. k
end& h9 S- R; ^9 K4 H# T1 r
to regrow-grass2 s5 i1 j; j/ ^ m+ \) }
ask patches [" r1 t; {3 [5 f, D# K- V8 k, I
if random 100 < 3 [ set pcolor green ]: w* p& D+ `: T6 n# a
]4 a+ g8 I' x* W3 Y( b; u
end
& N ^/ e% v0 J) M) e7 a* kto do-plots, u5 F- Z4 m. `; V
set-current-plot "Totals"% V+ L% d( J5 Y$ e: L1 Z9 d
set-current-plot-pen "turtles"
1 i4 P! K2 u' r3 F( h plot count turtles
' S! T! n) o. C$ H* l1 ^; t set-current-plot-pen "grass"# q1 \; Q1 `$ s# M$ \8 L" t: j
plot count patches with [pcolor = green]" W! q4 n. @4 Q3 i- w n2 `' B5 p
end
6 r" Z# q% C- G/ g0 H6 A% K( o可是运行时提示no such plot: "Totals"
* J9 P' N' D" l9 @8 b/ Jerror while observer running SET-CURRENT-PLOT
" r/ v1 u/ O% K8 w( z called by procedure DO-PLOTS
0 r3 w- Q! e% b: W9 | called by procedure SETUP
- h) T0 O, P% z: C- ^ called by 按钮 'setup'
" K( N6 s V5 v4 u# H0 d+ J3 W求大神解答啊 |