我编的程序如下turtles-own [energy]
; _# R. [) _ Z- X: g2 h. x$ I. g1 Lto setup3 [ [: K* g* _4 b9 F' j+ l
clear-all
- b) }* m% c6 T: x' K setup-patches0 k8 F3 j& A* n Z$ j z
create-turtles 1009 c/ p6 Q2 H+ a" z0 W) z2 a. j
do-plots
: ?, ^/ {( P2 [4 V7 P ask turtles [ setxy random-xcor random-ycor ]
2 q( }( I4 y- r bend
9 `3 u# a. e$ ]to go
% ?5 M. b' A: A/ z/ N6 A move-turtles
4 H2 H2 \6 U7 q4 x, ` eat-grass
2 _$ r8 b! [! A7 ^ reproduce* F! S V( K! ]0 i9 b+ Y
check-death
8 j6 y' _3 j2 w) F3 I6 }1 a5 f regrow-grass0 `& P, w, z. ?! \! {
do-plots+ ~4 r0 f7 G0 U2 A4 A! \8 E# E
end
7 [4 _: t$ b: W# D. h+ L/ Oto move-turtles$ Y; r: E: {, g r8 h+ m
ask turtles [
$ O! S( O. v1 K, T) s3 g, w- K right random 360. c3 @& G& s. }
forward 1 n0 V( ~' Z/ x1 H% u0 s5 d( a9 [
set energy energy - 1+ [# n+ d8 u* h5 c& Y
]
$ d& U% G( J5 m" J& bend9 E: a2 T3 a+ v6 x- `; R. X" j6 ~
to setup-patches' q0 E- E' `6 Q
ask patches [ set pcolor green ]% f4 r1 a6 I6 v+ g4 v
end! r. l& X* ]4 v0 @/ I, r4 O+ M
to setup-turtles
- S" m$ i. |$ F W) c create-turtles 100 \/ y! n9 C+ W5 ?4 v
ask turtles [ setxy random-xcor random-ycor ]
+ E' A* n. {* N0 A; n% q m% |end; w. y T% g8 ^; b3 y9 n+ @
to eat-grass/ d+ M( Y2 V" V/ v3 }% Z w, \) P2 V% ?
ask turtles [; ~3 L" d' j. |4 F
if pcolor = green [
7 K* z- z' Z9 q# I8 u set pcolor black% [$ x0 y* e6 x9 f( W
set energy (energy + 10). ^8 t+ q. S. U2 X5 I
]
3 O3 e. S7 Z7 d% S. s& W ifelse show-energy?0 i$ F8 T) l9 B
[ set label energy ]
: s, Z9 T$ |5 J3 M4 E [ set label "" ]
5 h. v5 y. k2 A5 _- X; Z8 g ]! L1 [# o( Z& s4 [, F
end {% i0 ^( M: ]7 }8 t2 j5 I5 b& R
to reproduce6 T6 T9 o: n3 A) B( T
ask turtles [# d( @7 O1 ?# R8 [0 p
if energy > 50 [+ q' s* J& \6 m9 r+ ^
set energy energy - 50
$ E1 O, C0 _/ ` hatch 1 [ set energy 50 ]9 h! t- W6 b& {, J) W. h
] _- J2 x/ ]" o6 y6 ^: x) t, b
]# F8 ?8 B* _5 b+ t6 ^( g
end0 L7 G3 A0 {; ^5 f" g0 |8 i1 b
to check-death. e, X6 o4 x$ E" Q0 A
ask turtles [3 l+ Y; z) T+ i( L5 a7 L
if energy <= 0 [ die ]2 ~* U. [2 W3 s2 J
]7 E. g$ q; ]- w/ U* P7 P
end
* v6 {% B3 Y' w! jto regrow-grass
( c4 Q) ~/ }" Q% t7 q ask patches [+ q. q. h2 a2 Z) C
if random 100 < 3 [ set pcolor green ]
4 n- t) V% M. q' f7 \: E9 J ]
. C4 z' F/ E' j7 Y0 Z9 f- dend* t# }3 Q1 ?. R w
to do-plots
( W- u8 _* b' ^* Y7 S f; P, L) ]9 | set-current-plot "Totals"
+ v+ w0 A% \% ^ set-current-plot-pen "turtles"* E. ~# o8 ?; ^7 { c
plot count turtles4 ^+ t5 {. |/ q4 h- z9 L
set-current-plot-pen "grass"* K: f8 U5 E. S8 G2 s
plot count patches with [pcolor = green]
: L( L) U0 y* ?7 Tend
0 H& K) b# S8 X" N# \% l! L可是运行时提示no such plot: "Totals"4 w, {" |2 ?- Z# J9 ~
error while observer running SET-CURRENT-PLOT$ e" T. k2 \+ b: C% {) X
called by procedure DO-PLOTS' ~( k( r9 W0 L
called by procedure SETUP
5 L# `8 N5 c" s9 l' o* ~* v called by 按钮 'setup'
: A0 r: O( n4 b) A& }9 q; U求大神解答啊 |