我编的程序如下turtles-own [energy]
" G; j1 Z6 a+ R2 rto setup. y# T' h5 c3 [5 U% r5 y# c0 Q
clear-all
( u' F$ _5 c" \4 j, X' ]/ p setup-patches* {# C3 j. T- ~4 z/ Y- Z$ _
create-turtles 100- e! |3 C9 X5 H" F" G
do-plots/ A3 Q. E. ^( v5 e2 y9 n% p( G
ask turtles [ setxy random-xcor random-ycor ]% Z! [3 ?/ F# f& p; Y; Z: k
end
0 r& V" Y! ^: F. A5 ?& ], Ato go
) C0 ? t1 D% [ move-turtles
, A: g# E$ {9 o5 v eat-grass
: X; Z: N1 Z* ?2 c6 ]1 P9 h* W/ ` reproduce/ t1 t6 V% w$ A/ `/ s/ v9 f; `
check-death
. t/ X. B7 }$ z; h2 B$ H1 U regrow-grass$ q8 H$ e2 F; |7 F& E
do-plots
6 V! D! [2 B" s4 {. v) i# ~/ Lend# X7 f: ]9 y5 a+ U
to move-turtles+ }; {# { S% l& u5 h7 M* f* F
ask turtles [
3 {$ _/ j# n0 k o- y right random 3602 \8 Y. E! ?7 c) ]
forward 1
: d$ O( m2 e# f8 g3 |! \( j set energy energy - 1
- b# h; e/ ?1 d$ g ]
5 U- P& C) O1 g5 X( f$ O V& `end
1 J0 m6 N9 H9 M2 d; ^to setup-patches3 q( @3 R$ _0 Q' v( E5 m
ask patches [ set pcolor green ]. r- u/ g3 U* M
end
+ J; n& Q. }; U/ b# rto setup-turtles
, ~8 y: f4 _! X5 G, v6 O create-turtles 100( V8 f0 {+ _( _0 [5 {- T; T: E
ask turtles [ setxy random-xcor random-ycor ], ^& H. _: C v' w" r. D
end/ d1 P B0 N7 W) W( k
to eat-grass
+ O5 w; H X& F ask turtles [
/ ]) p- K2 f8 [4 w/ z9 l" F& z if pcolor = green [
; w" F" E# n" t3 k" {- Q* d set pcolor black
/ l* m; }6 e- U9 W9 Z" V set energy (energy + 10); d5 y) E9 j5 U( {" t
]
" v" \8 n8 G! p: M. s C: W ifelse show-energy?
& n" k4 ?6 B9 @$ @ [ set label energy ]4 M' ]. g) v" q- K/ X" \0 m* {
[ set label "" ]0 M+ P$ g7 K, |; l4 e4 H
]! H8 d. U. a2 S6 y% z) ]. J: I0 W
end/ V: q' T) D# R- j- \& z5 b7 a% m
to reproduce
% C- Y( I( p/ k( h" S3 S ask turtles [ u7 I1 q; x1 [$ @2 {
if energy > 50 [' h/ c8 V; c" g6 ?8 S
set energy energy - 503 Y) f6 s- M; q% n" P
hatch 1 [ set energy 50 ]8 \ u( P. r3 B: T# j
]
5 V& ]5 F$ [! L ]
1 B4 w0 h3 X' b! pend" R$ M" @: W. f; S$ F' L
to check-death1 f/ W/ L" L h( Q) B. D T
ask turtles [) F8 u# M: a; r
if energy <= 0 [ die ]( I1 W7 a1 `) u4 N) o" t
]
6 c9 B4 s7 H! A5 fend
! ~2 h7 D3 R: r" t1 [3 Hto regrow-grass5 j0 C4 |# I% B+ c1 q M0 k! T0 e
ask patches [0 K' a: [2 k7 Z: ~6 |
if random 100 < 3 [ set pcolor green ]4 q( _* x5 V0 N9 s( z6 U7 h9 A8 \
]/ Q+ N) T% e% T
end6 D# G e4 ^3 I& f
to do-plots& ]7 r" \" f" a' q
set-current-plot "Totals": N, _% N% }. l
set-current-plot-pen "turtles"/ z* G* }0 _& Z6 G' [
plot count turtles
7 y5 `. J. `# u set-current-plot-pen "grass"
/ ^5 r: G! N( @! t+ g# Z" m9 {( a9 X plot count patches with [pcolor = green]) t3 G& }2 ^7 N* y' s) b" c( ~
end7 C% [5 Y! c+ p, f& v7 K
可是运行时提示no such plot: "Totals"
& F7 ]4 `, M- g z; Xerror while observer running SET-CURRENT-PLOT
6 P/ I8 ?3 T: |% A7 H8 X" L called by procedure DO-PLOTS
3 C% j/ b' ^$ r$ Q; [% H. {3 ~ called by procedure SETUP* a2 p1 _4 T6 W) p* Q
called by 按钮 'setup'- W8 `8 e ^* x: Q! s. m
求大神解答啊 |