我编的程序如下turtles-own [energy]5 Y5 @8 R, p$ R! s' N/ L
to setup
, m' a0 C) `5 Q7 k W( v clear-all4 I0 p" o. f K2 n6 P9 j. |2 J
setup-patches) l" g! I& `9 O6 J
create-turtles 100
8 ~7 C3 h" d) t: c1 L+ k# f do-plots
9 k* Z$ o2 h+ s ask turtles [ setxy random-xcor random-ycor ]
6 s x" @$ b# ^. i2 zend; H% a4 S9 n- r2 ^/ R; k
to go
0 x- a5 Z% _' L7 j# @ move-turtles {/ S: r3 Q4 s9 o
eat-grass
5 z, i( s( b" B5 ^ reproduce
9 {' V% \' n$ _4 w) z- R- y0 R! Y check-death6 y" r6 y2 \' f4 |
regrow-grass
$ y: d+ q! g5 B# R! V7 a; X$ K( U do-plots
; R6 d' ~& ~' S5 _end8 R; q4 Q6 |) y0 s& {
to move-turtles9 @2 B" Y+ Y/ v7 {" N' a
ask turtles [; o& P! `" e8 P1 D M# j# h& A
right random 360
5 E P( X( z7 Y; I6 W forward 1- p) I/ {4 G6 C8 F
set energy energy - 1
0 N! Z: F6 k& B ]
' j3 E9 Y3 E& uend) J, Z6 H7 y- i" c
to setup-patches; B8 E% h+ D0 Y0 `" [' \/ [, }
ask patches [ set pcolor green ]5 G2 `* n$ u/ [4 h0 ?. M. d, M
end' e6 D& M3 r! s6 q/ D
to setup-turtles* H9 e& b! j1 _* y6 i: P
create-turtles 100
s( J: H5 ^$ i2 B% a ask turtles [ setxy random-xcor random-ycor ]: P% k$ U% x: [4 I
end. A6 k, R1 E! H: U4 \) k7 u( {; C* h
to eat-grass" m4 U( T! K8 r; f6 n% O
ask turtles [
1 `! \) S3 ~# O: j if pcolor = green [
1 i3 O% l, G6 K$ b% j set pcolor black
3 B% k8 q7 O Q ~* ] set energy (energy + 10)
: h5 ]4 i; f4 m" O! l ]& Z# D8 W7 Y2 i# H9 F7 Z
ifelse show-energy?0 |: |4 [! [- O. ]$ v
[ set label energy ]
; F# J J. f7 p2 } X0 p' }; l/ U [ set label "" ]
4 e0 V$ B# W/ A) P9 O4 V4 e ]
- H' A: z' o/ Z. m8 j- {, V8 dend
& C( {" o ^2 P; v4 A m$ n$ g! Q; `7 @to reproduce6 x% O/ e8 w' K& L1 _0 ~
ask turtles [9 v+ L* J! N, J* H$ m j. Q
if energy > 50 [: `0 p! p3 {! }0 C5 i& U @( C
set energy energy - 50
% J* {% `5 t9 T( | hatch 1 [ set energy 50 ]( ?: w' L+ L; K2 a. R& n4 \
]( U; x |9 L7 p# M
]9 K/ L6 r. ]% f. d9 q1 n
end w0 G6 U! ^" ]$ K! M
to check-death0 z) S! V; C' t/ |4 m+ z( p
ask turtles [
6 U5 ~: q# _% ^( `# r if energy <= 0 [ die ]4 z2 S7 a- p& q+ R9 x0 D
]
8 U( O4 F/ B7 K/ Oend
8 ]7 A7 A4 C- bto regrow-grass
( K4 G3 M! _& R1 v5 b ask patches [
. u* I1 a- ^6 n& b- I- h# U7 S if random 100 < 3 [ set pcolor green ] b$ w3 N- s( P4 X* j3 ?+ P
]
]7 ^& Z" b6 x9 S/ K& `end5 V. p" l* }% U& J
to do-plots
' u1 W: L, G: w set-current-plot "Totals"
% `' d4 ]! ?# ?# k set-current-plot-pen "turtles"
3 k: W1 h+ N% R" @! C( N plot count turtles
! u' P* H( Y7 p; |# b8 S8 t! p set-current-plot-pen "grass"
" \3 f: r4 y" f$ b plot count patches with [pcolor = green]
) ~& g* |( e j) Gend
+ V. G8 @6 h4 `1 ~, m可是运行时提示no such plot: "Totals"/ y1 w0 }' @8 N( V
error while observer running SET-CURRENT-PLOT
" {& O) Z, R) t) ]$ N: z called by procedure DO-PLOTS! K6 B. U. c6 i% o: }# v* ~3 g+ p
called by procedure SETUP3 g3 } E/ h& ]1 ^0 ~0 b
called by 按钮 'setup'
0 V/ ^# Y D# l! l& M7 ^求大神解答啊 |