我编的程序如下turtles-own [energy]
I6 t$ y1 j7 K G; bto setup5 K& Z! Z0 f& |/ C
clear-all
, }( r3 c$ o8 D2 X7 v) w c. V setup-patches+ R; }' [- L# f4 Z3 \3 y! `% v
create-turtles 100/ Q, j2 p! [' s4 Y* x% d
do-plots) q; K! H: U' n D8 ]- q/ ~
ask turtles [ setxy random-xcor random-ycor ]' `8 |* ~5 J& C5 i, w% C; w2 K+ \
end
" ?6 a; L& i! i- s/ M2 F5 Dto go
5 I6 w: E$ k, Z1 _" w- q- | move-turtles
9 n) N9 j+ }' Z1 ]- O7 j3 z eat-grass
! y8 g3 @! B3 V4 \. L: r5 b9 P reproduce
! L5 Q6 ^* R- ?1 y0 ]; n check-death! Q, Z# C( v2 X1 ^5 s
regrow-grass
" x' `+ V+ O& W3 u4 L: P, W do-plots
2 r7 f+ @: Z) x! U+ yend+ J/ _ a7 b- C/ ]& Q) H
to move-turtles4 _) q$ }5 \7 |, z+ l I# o2 _3 H
ask turtles [
: _; Z8 J' y- J5 M8 O! \ right random 360) {# e9 L* P; z/ r8 ?
forward 1. t* G5 z# ^+ z$ c1 ^% n* ~
set energy energy - 18 J/ g( K- w4 C5 D- `7 m. v5 G$ |. z
]9 m k. B0 U0 ~& r$ t# D" l
end
( m* h. l+ M) I6 J* p, ]" I0 \to setup-patches
2 D& d, V. v4 B7 v0 q ask patches [ set pcolor green ]
) _. F& R6 G% N$ l# `( W7 [9 Fend
! Z3 y, B. J6 H5 qto setup-turtles
8 }, R+ [- Y) i, P% ^0 G& b create-turtles 100
% q6 Y/ S0 a, V0 F0 o0 x6 ^7 N ask turtles [ setxy random-xcor random-ycor ]8 P; g9 O/ s9 E! }8 a
end3 A2 q1 r0 J2 p
to eat-grass
9 J: T5 Z9 f V0 y ask turtles [2 h2 w& d/ u( ]9 z+ A/ {- A8 N" h
if pcolor = green [/ W1 Q+ c1 z, _; I
set pcolor black5 |1 r9 I! G9 T+ T# l& d; A) X% ]) D
set energy (energy + 10)
2 P- y% @$ P* }% N7 l ]! q8 r3 S3 k- a. @
ifelse show-energy?% x, P6 {" r" j& b1 n
[ set label energy ]
* f8 F" f! g7 x6 t* n [ set label "" ] {1 u5 e5 Z5 g: T0 a6 T* ~- f, N
]4 _9 r# y- ^9 M Z$ V5 J1 v9 o
end0 U9 A$ a' |- x5 L* X
to reproduce
* i1 @4 f7 G8 b( \, |' U ask turtles [: Q" W" Z) ~3 q. \
if energy > 50 [ x. l) Z! g8 X: K }
set energy energy - 508 F( `4 ?) q6 K4 _( Y/ N/ q
hatch 1 [ set energy 50 ]
1 ~& t( E7 k, I- H; {# t ]- M4 \$ R8 F4 M# ~' F
]
I4 Y# r6 k/ u2 ?end
* q5 z5 a- B4 T8 L; O7 nto check-death
8 W) o- m! x' j% L ask turtles [
+ P( H" R; J- F: z if energy <= 0 [ die ]- ]7 d5 Q# ^( h& \$ g5 v
]
+ S- F l, m: ?7 X- {( l% O* ?- Nend6 h2 @- A) F0 V, C; C. Z' ]* o
to regrow-grass6 Y) O5 U" c* [( J8 J" i
ask patches [+ `$ J k1 r' n4 C
if random 100 < 3 [ set pcolor green ]9 h O" e G% X$ w; P
]7 l/ |) a9 k4 T& S3 e
end4 r" f1 r- m3 r
to do-plots5 F; m& u5 } x, Y
set-current-plot "Totals"' C) s0 u- t. U5 X
set-current-plot-pen "turtles"
" Q. J! J* U. d+ D6 O W# m: I plot count turtles
. W" N% I0 U; o( { set-current-plot-pen "grass"
6 J3 E- I( b( [4 U4 q+ u& [ plot count patches with [pcolor = green]) T' P) I9 _) Y, Z0 K5 c9 | d; O
end- e, U/ b7 x* Q' k8 C" d1 n0 o
可是运行时提示no such plot: "Totals"
m: l) T* C; m6 Serror while observer running SET-CURRENT-PLOT
( i, @# M( }. p; m called by procedure DO-PLOTS0 ]* y6 c7 W( j0 t
called by procedure SETUP) F6 H' N: q0 R$ D- |
called by 按钮 'setup'4 A3 T; r+ x: ?( a& r, b0 i
求大神解答啊 |