我编的程序如下turtles-own [energy]+ f5 x7 s9 [2 y2 D2 k0 D3 _
to setup7 b Y p! F, \ _; V& N9 Z
clear-all
! U* |' p Q) J. f) Z setup-patches8 H9 }$ G3 ^) j& G8 H" N) y: X! a
create-turtles 1002 @! k$ n- M6 M& O
do-plots8 p* u# R5 y' Z/ F5 A- U
ask turtles [ setxy random-xcor random-ycor ]$ F; M) u( c: R! n7 F
end
' e9 Z" D0 b' |! N7 \' p; S4 mto go
y7 L' {) T R3 H! i move-turtles: u: @/ n. [% ~' F
eat-grass6 T# n' K% {9 g% K8 f; S6 W1 A: D
reproduce- T2 T( b+ P( a: v' N9 W
check-death# \" {3 V3 N3 A5 t# k" O5 M
regrow-grass
& d0 h! H/ S. [* Z do-plots
/ w* z+ n& y6 Y8 Yend U. i: E1 ~7 U6 z
to move-turtles/ d: Z4 k, `* a' o$ _ w
ask turtles [
8 R9 Z* ~& F' t: f right random 3609 z6 h4 T, S6 c' i9 v* v6 A
forward 1) `: S# j1 p) k2 y. }9 a
set energy energy - 1
f5 x9 J) E7 X* ^! _- l ]0 C& D$ l. b0 Y0 P, j
end! m! D1 i$ _( H) X7 J0 O+ ?
to setup-patches
0 ]( o" |9 |8 b ask patches [ set pcolor green ]
9 i- @; k/ _$ pend: o1 z) z5 Z& U+ {$ m
to setup-turtles
. W# z) A+ B( W- H2 w: K create-turtles 100" g, g! n1 i# H( A
ask turtles [ setxy random-xcor random-ycor ]
5 j% U* Z" X5 Xend
( {, I! L% c7 Y9 `) |to eat-grass K1 n& [- \/ ]
ask turtles [
# a; X3 f) `0 C9 z: {8 S if pcolor = green [6 o" A6 \+ W# H* j' D0 J
set pcolor black! |- M6 ^7 B, ?5 _) ?
set energy (energy + 10)
w4 y) j4 l# l ]- U5 ? o. T4 {. P; t5 y
ifelse show-energy?
0 N, g9 M+ u' e/ @6 }2 B$ O [ set label energy ]+ d0 H, B" j c4 B$ M9 z, R7 K
[ set label "" ]
- @# l- ^ D$ u- E6 ] ]
4 [8 H# I" a% yend; t6 f. M l5 P# o9 ~
to reproduce
* ]$ t! K4 a. ]# v# m ask turtles [
" v D# m; M- e5 m' x& ` if energy > 50 [! h5 z' {# V4 @; Q6 h5 {5 ^- k
set energy energy - 50; n7 R! F% Z- A) N0 `
hatch 1 [ set energy 50 ]
/ [9 k' k- h Y, X% h3 d* n3 R ]8 O# q' V" p! {: Q( K0 |- S3 u) u
]
/ T8 f" Y( _( e# f2 A0 Zend
4 h8 F2 _' S, ~& ~+ W( R# Yto check-death
- z/ [5 j2 W/ c& B; k- h/ [# D ask turtles [" G: S* @9 W* }5 U* i4 [
if energy <= 0 [ die ]5 f" m- g! g- P1 o, k
]
) {& d: @1 p3 `, e! {2 O. send
6 p4 ~* p9 j- S/ F; Vto regrow-grass: |1 B, w3 @7 }! \* o8 T+ Q
ask patches [
, a4 R3 d" y; k1 h% [ if random 100 < 3 [ set pcolor green ]" t2 f( r4 T4 m. n; v E8 @
]
, f; a: Z+ U$ Iend" O/ d( A7 _3 L
to do-plots
' O* o' O) ]. j) S4 W set-current-plot "Totals"
; X- S! L0 t+ V1 l& k$ J set-current-plot-pen "turtles": q+ @; p! \+ f5 |8 ]1 H% B- L# I
plot count turtles& h1 |8 S% l# w* Z) _7 O2 k& A* h4 I8 o
set-current-plot-pen "grass"
. {" w$ X& R( f& K% k# k1 _ plot count patches with [pcolor = green]( C4 p$ {/ |& w
end
, D1 @9 T2 q3 ?可是运行时提示no such plot: "Totals"* b) e# p7 N$ B# R8 M$ S; ?- A
error while observer running SET-CURRENT-PLOT2 P( a N/ r2 X
called by procedure DO-PLOTS: y! h" Y% I4 d; r: A7 F- w+ M
called by procedure SETUP7 q- x7 j/ ?8 `% O
called by 按钮 'setup'* F$ O# o R6 A
求大神解答啊 |