我编的程序如下turtles-own [energy]( ]( P! W0 v, |. t( k @4 h
to setup2 {$ E7 c+ g4 q1 `& T$ \
clear-all
. [4 \! r# _4 L ` R setup-patches
8 y% d) C2 D d) Q8 p4 l create-turtles 100
5 Y% {- o; E) O do-plots& x; R/ X% p- }! U+ }0 I
ask turtles [ setxy random-xcor random-ycor ]5 a1 S3 z' W0 J( s) P
end
" x$ C1 w; ~: Yto go
* P, e& _/ [, r% A0 R+ H move-turtles
6 Z: ~4 R+ F2 ~( @. K+ e eat-grass
# {% \5 W' U8 Q reproduce
1 v0 F' \# [% O$ Q) ^3 k( `. l) h check-death
" u( H" Z1 s7 Y/ N regrow-grass
9 \, R; Z0 u5 a2 l: S do-plots8 n2 y) L9 D' T) K
end A8 O; W; O4 q9 L2 c7 ?6 k" b
to move-turtles3 x" w |$ z& ] m
ask turtles [3 t% C: |- g5 }% w9 ^# Q; m
right random 360) J# V# T" [7 q- w1 T! H* X
forward 1
3 j8 W' |. l4 a9 |) Z8 R5 S set energy energy - 1
) s. [+ `2 v! y* K! O' u ]
4 Q& j& h m) [! d6 Hend
1 X& W$ d8 ~1 I3 X+ f5 L& ^9 xto setup-patches
# \+ U( X Z; L l" K ask patches [ set pcolor green ]
8 a7 O9 u) M& E1 z- iend
* g B1 H, ^( p- X Vto setup-turtles0 D4 n: @/ Q8 E& w. W' p
create-turtles 100
* `, E( f4 d S- c- K( c% \ ask turtles [ setxy random-xcor random-ycor ]' s5 `. _ g3 l. L* [. o! l. v
end
9 e/ U$ H( [% s; |9 U* Cto eat-grass
( ^9 U* b( g4 g3 q) q; z; w5 c ask turtles [
' D9 @& b/ B) v, j- J" k7 z if pcolor = green [( i+ x a8 |/ c% F( c4 I
set pcolor black
* N- R2 p+ J1 J1 D/ b- @* Y6 u set energy (energy + 10)
- N `; L; F" y ]
) B+ }% b7 c% J& I1 c4 ^; ` ifelse show-energy?# f# f/ e5 t1 q* ]
[ set label energy ]
$ C/ J5 Q$ e; g& Q9 K% A [ set label "" ]" S: C+ U+ N! K
], T5 X& a* b& c7 m5 h$ f3 W( ^) ~+ y
end
@ k8 b' [' eto reproduce
; A+ |. j6 d/ ~5 N ask turtles [+ g* s1 k& ?% S
if energy > 50 [. {' ^; x( N& |: x- r& ~
set energy energy - 50
; B$ H1 d, ^& b2 O; I. g: Z5 N hatch 1 [ set energy 50 ]; l7 p( V% l0 d/ y6 Q+ q+ O
]! `% i' r3 ~5 Y* N
]
, k% p% B/ B. S- F( u5 e! q/ r3 oend
- b8 f5 S2 R1 i; T+ G1 e$ d p* ato check-death
' H2 |; d+ z- O/ B/ f* G# o7 W- s" D ^ ask turtles [
( @) N; | f' T z p5 C if energy <= 0 [ die ]% g' T0 Q* V4 u' Y5 N3 G( l: f4 Y7 N
]
O9 y, K0 P; T" |- Gend
$ ^6 ]/ s0 h: |' d' Eto regrow-grass
' g5 B# F U1 ~$ O ask patches [( N) `' w" Y# j
if random 100 < 3 [ set pcolor green ]- P- n2 v( E5 Q$ j7 I
]
6 W! B( |+ L* qend
# m6 V z5 F4 t: J0 p& Vto do-plots
' x- m. f) F; S4 ]4 { set-current-plot "Totals"5 c" _$ [% E {. {# s
set-current-plot-pen "turtles"
' ~7 F7 d: ?0 q6 o m plot count turtles
7 j/ m* O, t: {" c4 t set-current-plot-pen "grass"
' |. b1 ?7 Z, I8 n" G6 {6 D7 \ plot count patches with [pcolor = green]0 `) Q" d: {. Y9 B# g5 k! L; }
end
* v; K' G Q5 J; r可是运行时提示no such plot: "Totals"
6 _- V6 O1 @" Q: u% R& ~error while observer running SET-CURRENT-PLOT8 S( P5 c1 b: e: n9 H0 Z
called by procedure DO-PLOTS
7 |* u% U3 M1 a! D6 r- L, R! g5 e5 j called by procedure SETUP# Q D) ]8 R& B! L6 m0 A! X# [- A
called by 按钮 'setup'" A2 h9 v( F$ S
求大神解答啊 |