我编的程序如下turtles-own [energy]0 B5 O* ?: y: B
to setup e) R1 c h+ G9 b
clear-all8 Y. W8 d3 w4 w6 G* A$ L( i
setup-patches
5 ~* J# C" @! }' p create-turtles 100 F5 n, S* `1 { d7 G
do-plots# C/ J4 o5 N$ W( V5 O/ H& X0 r# X
ask turtles [ setxy random-xcor random-ycor ]) {0 z# F# l! g* A N( D
end
2 _& q7 b' _" @to go" l' m x0 f% {
move-turtles* S; i# u, t: c* c
eat-grass: ~; I8 R1 P* B/ i7 `( r' X& e
reproduce: x$ W" i3 ` R: F7 t
check-death2 a4 C5 ?9 a, S9 w3 g& J7 Q# X5 q
regrow-grass
7 l/ L8 G+ x# `! U( E* j do-plots
: h" V3 p* d) [5 W! K, e% Uend; ~9 ]; Y5 A1 {, n, a
to move-turtles4 O- C9 h/ Y7 G n( f: N9 m' ^$ A
ask turtles [
5 f$ [& {7 X$ o8 H! ^ right random 360
& A7 v% }2 H0 H# _) c, U c; i forward 13 z' f' ^7 E5 r- ?# N" F5 r
set energy energy - 1+ ?* l0 r9 w1 V
]
* n$ t, \2 T4 E: p- y" iend9 X+ p- p- {# o6 t! I9 c
to setup-patches
0 _4 A1 L' Q4 }1 h# A" t ask patches [ set pcolor green ]
7 E$ t/ e, G+ \# |7 ]end
" K; {5 {0 q. \/ H7 n; b- ^to setup-turtles/ A$ e4 J6 ~2 F+ A+ Z/ o4 {
create-turtles 100
( w! s4 Z/ q+ W5 O6 ~) Z* u- ~ X ask turtles [ setxy random-xcor random-ycor ]
; u6 g7 g: ^# A( \- \: H1 Oend D1 f4 ^/ @3 Y# f7 M5 M2 l, c6 w
to eat-grass
& z+ L4 k! z! F1 P B# o ask turtles [+ p; Z) k+ h0 Z; d6 ^
if pcolor = green [
& R) W' B I/ g* O set pcolor black# z' u& E# ~% A- \( E W* X! R6 b
set energy (energy + 10)
7 B, A" w1 L' z) E+ d5 p0 ^ ]
8 Y& f9 t( Q; M3 [; l8 ]4 C ifelse show-energy?* s1 h6 g1 q' H& {' p* d+ f' t8 Y
[ set label energy ]% O `/ `1 W; ? j5 d
[ set label "" ]* l0 n% k( C' L/ U4 D* o; j9 f* @
]
2 q8 b* D$ V# X( v0 Mend
1 S5 b8 [6 g2 \to reproduce
" ]2 R# j% \6 x; W" t/ A8 a ask turtles [
$ W8 t5 L3 R. ^( M if energy > 50 [' _+ O0 \' s% L, q K! m
set energy energy - 50
9 e0 s+ a; v# A/ r; s/ a hatch 1 [ set energy 50 ]- ^6 @; x' s, w3 p
]! u* Z* ?" ]5 X: _
]
8 [; A3 s/ m% ^0 b* b1 G0 Z9 R* [end
/ F2 R& x5 J: N5 l* q& m) x7 ~to check-death8 L7 R( h; f6 Q" Y* [! X+ z% [
ask turtles [& i5 p( Z. r8 y7 K" t9 ~, F% D7 S" F
if energy <= 0 [ die ]
: M2 _; e7 E/ u6 D5 J) [ ]
4 L+ [9 q6 U$ \2 O9 P9 Iend
% J, o8 o2 i1 R- ^( Rto regrow-grass0 x, U4 y) t* ]0 H
ask patches [) e4 g+ |6 ]; \: w9 n
if random 100 < 3 [ set pcolor green ]$ y( c0 S( `( l0 y1 h, ~
]
( o: N7 f$ Y, q/ ^" g- j, q! Fend9 j% X3 O* B, x, s1 t) s- k
to do-plots
6 S# h! G, }3 P, B; U' q set-current-plot "Totals"
" C- a' ^, |5 o& n Z set-current-plot-pen "turtles"$ j) j# w5 J( G9 h/ f
plot count turtles. ^% Z- t( ~% F$ i" U
set-current-plot-pen "grass" _* h2 k/ w' G3 E4 V. `2 D( u
plot count patches with [pcolor = green]
1 F. _0 u6 c$ q- v+ q5 Dend' G* Q; C5 ^) W1 p# b% N
可是运行时提示no such plot: "Totals"
: l: y# n0 ~; f* ?* Nerror while observer running SET-CURRENT-PLOT- |& I0 ~, }/ Q) p# g! F
called by procedure DO-PLOTS
9 K: O+ U5 A$ P, { called by procedure SETUP) q% H; S' G! N, j) R5 T$ ^
called by 按钮 'setup'* r1 A$ B, \. g! d6 k3 ?
求大神解答啊 |