我编的程序如下turtles-own [energy]4 t9 ^8 ~& e& M. o& n6 ~2 x
to setup( u7 Q6 U+ z5 b6 E/ r" p
clear-all6 b) [' X" J* K6 @
setup-patches
+ ?4 X8 x6 O+ ^, m/ t. Z create-turtles 100" \7 Q/ T \# \
do-plots/ C: U6 m. }( z: X9 i7 u2 @7 v& ^6 Y
ask turtles [ setxy random-xcor random-ycor ]
0 h c. E* x6 l; y% wend
8 P7 ~9 L5 v' U. _! k3 q, ]to go4 _* j: v/ f, }3 ?9 \- ]
move-turtles
/ x4 [! Z9 }% e+ S& H* H2 @ v6 ? eat-grass$ a% I' I0 y( d! }, ~/ E7 N
reproduce
( j! u$ R) ^$ {$ \4 |" t$ p check-death
" ^7 k8 [9 T. x* ^( Q! ?3 d; E/ }5 C+ ` regrow-grass3 p8 z2 L5 Z! Y$ o* k$ b2 m u' g
do-plots
; H7 M6 k# C3 I; A, k1 ?end
- h% B7 N8 f+ F! K% A) _; s. Uto move-turtles
$ k2 Z" t d2 R* X+ ` D ask turtles [
: U$ N, O8 h$ `8 `: ^& d right random 3607 A/ \, k) K6 s6 `
forward 1# V8 |" m9 ^3 E* h
set energy energy - 1
2 L7 Z) g( \+ f$ j6 o ]
0 @9 Z9 |6 d$ R6 P4 wend4 O. v$ f! t: z% Q E p6 ^! J
to setup-patches; ~8 P4 z! K: u; O6 k7 E2 r* J! h
ask patches [ set pcolor green ]
. r7 ^0 `8 V L4 V5 Iend" h& J, u$ E$ U# |# r; o
to setup-turtles
7 n' M# E& v' ?- }# A. V create-turtles 1004 w+ a) H2 k* J
ask turtles [ setxy random-xcor random-ycor ]
: }" @. b, q/ R2 X, F K8 eend" w) |" s) @* D, Z/ N6 |: q) h
to eat-grass
& u+ j" ^ c4 E( H; C ask turtles [
- `8 c7 w. O4 S0 a. ?% _/ L5 J. M if pcolor = green [
) u: s+ X! W) ]9 a set pcolor black
6 `: N% a8 M) p& c set energy (energy + 10)
9 r0 J4 N( {7 E9 N+ d7 j$ P ]
x" r; `" @8 W9 `! | ifelse show-energy?
5 M1 D& ] R5 P+ | [ set label energy ]
; N1 W+ a3 p' o& t* i8 f8 n4 M [ set label "" ]
+ J5 _& M1 T6 z4 `& f ]
4 v- s& z' g4 a4 W+ jend5 V; `8 T' w! P9 J7 d! S5 l& ?
to reproduce1 J3 }& W, e" i1 o. }
ask turtles [
" ?1 T( [( u( B, @: Q if energy > 50 [
* V9 j" a0 S: M' J6 A8 K set energy energy - 50, W/ I+ M" E& D) o
hatch 1 [ set energy 50 ]
- ]0 {- v. F: N& h8 X ]
2 S% t# A9 [+ I: F ]/ t a9 W' H8 Y4 i* I
end
C+ R0 o$ I: i. j. yto check-death
- n( C1 E4 I& G7 J# K ask turtles [
. X. R0 ^" h0 l( O- p7 d if energy <= 0 [ die ]
/ ]" c* c/ q* W ]4 u1 q% C* c" k7 Y! T2 x
end/ y9 K) z7 }0 |6 G! z
to regrow-grass9 ]/ N6 p/ ^8 `& P& X G
ask patches [! g! ]2 }% X1 a2 f5 z6 Q _- k
if random 100 < 3 [ set pcolor green ]3 X& O- L i/ n2 E1 Z
]
: f6 \! u- N" V1 h: Mend" L3 I+ v$ Z' V" p1 ?" p! Q: ?
to do-plots
8 ]. _* i. L5 ]3 o! o set-current-plot "Totals"
" F8 L0 c9 A0 R* S# U; ? set-current-plot-pen "turtles"# Q0 r, v! l( A8 A o
plot count turtles" V' l7 v" ?1 J3 S4 G$ I; u/ k' t
set-current-plot-pen "grass"/ c. t9 s3 Z. V7 c5 N
plot count patches with [pcolor = green]1 ~, Q. q: u* J$ X+ L8 W9 o& J
end
, ^/ d( K1 X+ S) X( X' B: f4 i可是运行时提示no such plot: "Totals"$ M; |+ O3 O5 K1 w0 d+ R9 h
error while observer running SET-CURRENT-PLOT o* Q/ X9 v Q c R
called by procedure DO-PLOTS
9 f1 U; D- w2 b called by procedure SETUP0 f3 v, k9 L3 Q) g9 M
called by 按钮 'setup'
5 m7 n+ s8 K7 U! {" c4 ~求大神解答啊 |