我编的程序如下turtles-own [energy]
& r/ F1 A; _8 T3 A* @to setup
3 I8 s1 X4 k6 \9 I( c clear-all/ ^. D6 T$ @4 T3 U
setup-patches* H/ P# g6 @2 r% M
create-turtles 100* l9 c! t" J9 ^. N+ `6 x
do-plots: b/ N4 I; y/ U: p; w' \8 H% \" }5 w1 N
ask turtles [ setxy random-xcor random-ycor ]
9 ~& p. [( l3 U8 k9 c& lend
: g9 @ p- C. \" y2 U& h5 Ito go7 `$ ]7 d" `1 X* z# _8 a, E
move-turtles
9 w* t+ X I; u! x4 w, I eat-grass
: N3 s& L" R$ E$ a8 u) C reproduce% g. E* [. q/ g0 Q
check-death# C% u) @4 q% M7 v" T
regrow-grass, G7 T/ U' k$ y5 f* i/ u" z% p4 b" ?
do-plots
, a' E! n# k: {+ g0 d3 U& yend
; f* O& ~1 K0 p( ?1 Oto move-turtles
: s! d9 ^3 M9 u: x! @& N1 Y- b ask turtles [
2 s3 `& ~1 `* f% a6 O right random 360, F! d. G9 o' r$ y6 g- t; t) Q/ G
forward 11 W- q G! X; h) i+ d' W1 w$ P
set energy energy - 1
7 M8 B* S7 q+ l$ S ]9 N, \. K; P6 r0 |9 S
end
( I# P1 H) _: bto setup-patches
; a) v$ m6 ?% Z7 p4 F7 P X! B, R" ^) n ask patches [ set pcolor green ]
* P# z# r* d2 Q0 N/ Zend
! o, ~( o# d$ d" tto setup-turtles
6 E2 v1 G4 n; ~" `$ Z3 D+ E; _ create-turtles 100& p" J0 ]: B0 N* q
ask turtles [ setxy random-xcor random-ycor ]
/ ^4 z+ D- P) b& S5 Lend* s3 X/ K0 b. M6 b, y( T
to eat-grass
' {) F5 T; w! E9 C. F5 _3 V: N ask turtles [. x" A' X) |0 I0 R; B, k4 s
if pcolor = green [
% I8 J( w: @1 p& ~" E set pcolor black
$ d6 H- g& P+ l2 y set energy (energy + 10)
3 b: n# b- l# ^( V3 N' F) q ]
% X4 g- {/ J6 u0 | ifelse show-energy?4 c2 Z/ C; W9 V* m! G
[ set label energy ]$ v" V! o. K# Q% A1 ~' D5 i4 R& S
[ set label "" ]
: W; ^: ]( d* w' h ]
* E5 L# R% k1 N9 U$ q, s/ H2 bend
9 X5 g) j2 o C) H- [! H; zto reproduce: k2 N6 g* G/ B) X
ask turtles [
. l; X- G, a& ? if energy > 50 [+ r5 S N- q' A. x9 z6 J4 n
set energy energy - 50
9 _& {; @( x' T$ S9 ~$ {) l hatch 1 [ set energy 50 ]7 j3 E. n2 Q+ M0 J; }0 W
]
- O3 }. I" L2 O. z6 i5 y+ b ]% o8 A% T& f4 c- h
end
' N; g% s, Y) f# o5 ]to check-death1 G0 e3 J( t* Y; A2 {+ p) o
ask turtles [
0 s! i" E6 Y0 @2 r' L- l [ if energy <= 0 [ die ]% g7 b) E* ]- k2 p8 L$ o% x
]$ z! e- |/ p& \0 U, _- n o5 i7 T6 G
end6 l' K* k! R( D m7 }4 \( Z& T
to regrow-grass, B/ I. K( D% b* J
ask patches [8 Q% L: v: V- N
if random 100 < 3 [ set pcolor green ]
( J$ ?0 m5 U @/ }$ l' ]9 n ]
9 t# g7 X- G: R" E& |0 eend
6 _ z4 G* d$ |to do-plots1 N I% ]9 r: ~
set-current-plot "Totals"$ M5 a' ^2 E, K* K3 j
set-current-plot-pen "turtles"
" ^9 d9 P9 D/ N3 }7 e1 s plot count turtles
- T; D8 N# f/ [" P. |( s set-current-plot-pen "grass") w) Z& y0 m. m8 t# j
plot count patches with [pcolor = green]
. Q& }$ k3 s3 ?0 b4 q& Xend
5 X+ J, P9 ?9 }2 V i可是运行时提示no such plot: "Totals"
" R5 ^5 \! ~0 b5 Yerror while observer running SET-CURRENT-PLOT! u# t7 p8 C% U0 @* S4 {0 e
called by procedure DO-PLOTS }; H: s8 U R* Y
called by procedure SETUP
9 F5 i3 f; q: ?: o+ d u3 t called by 按钮 'setup'
. q; r4 d s& v; S# o/ S求大神解答啊 |