我编的程序如下turtles-own [energy]. P# S7 m' A8 P- N3 y1 z
to setup3 j# `# t0 w( \ ^" I7 A
clear-all
" b& f! z% ]' c1 Q3 Y1 z% a9 s setup-patches
1 {$ `7 T) u3 ^/ n8 g3 h9 U create-turtles 100( q1 L/ e' r- A* o4 A- l! R/ F
do-plots
. k5 H( G# v4 b F% d) q ask turtles [ setxy random-xcor random-ycor ]# @ J: o3 L' o6 L/ ]4 n8 p
end- r8 J& c; i( ~! Q8 y0 |* {% d0 R
to go) _2 H; t1 p- M. N# K
move-turtles4 K7 b3 L! z# W6 E
eat-grass
% W5 ~3 {) B/ Z" n0 I reproduce N: @2 y% B8 j6 B
check-death: |0 ?6 B8 r5 E9 j
regrow-grass! G- E2 v, K$ Z; i
do-plots
0 O1 N7 B7 S0 P1 L Wend
7 C( M4 T0 B/ H' a8 H* }to move-turtles
; h& Y3 a$ \/ K9 A7 S ask turtles [
( W% J! v3 K3 t/ V right random 3605 Y- c9 @9 G5 v7 N% M0 |+ c; [
forward 1
! ?, B v& o. T. @ set energy energy - 16 y: s7 W v+ o$ z
]: e- _/ p& W, l7 ]; C1 R
end l6 S3 y/ J5 H0 u
to setup-patches
6 H9 m! [+ w D7 Q% s) i. F0 E( Y ask patches [ set pcolor green ]
^6 `1 y$ U" z: G% ~9 Yend. I6 X3 z! E: X4 K8 V
to setup-turtles
5 b0 }2 O; s" ` u9 X create-turtles 1000 w9 S' p5 c, ~+ }
ask turtles [ setxy random-xcor random-ycor ]
/ x s+ T* O# ? @6 zend/ f. Q: T& d7 M' m+ g% h
to eat-grass
m; ^, g7 c$ ?9 w4 l" ^% I; l ask turtles [
) p0 W; ~3 z1 C+ v if pcolor = green [- J7 W3 c2 T1 C4 n: v; o: o
set pcolor black
P: G% B- U: \3 o7 q4 D* g set energy (energy + 10)6 n, D5 H0 _0 i
]
1 T: b2 g" w1 y ifelse show-energy?1 m% ^7 R3 M5 i# q) {. K4 S
[ set label energy ]) ?, ~, u8 P+ B' _
[ set label "" ]% \9 T2 L# N: `+ g
]
, X5 @+ E8 _' ^8 ~! h% hend# s7 C+ |1 n. h: a3 p+ O
to reproduce% _8 D" @! e! S
ask turtles [
{4 e2 U, ~( F8 p# D if energy > 50 [
9 @# q& A' F3 t8 g0 J* R set energy energy - 50$ R6 `9 M+ E( ?" s+ v7 J
hatch 1 [ set energy 50 ]
/ X# O( E; s2 {+ ~$ | ]
" q+ V$ I7 H1 R* H ]4 {2 G1 `/ [2 Y/ ]
end
0 l$ J7 l2 B! pto check-death
4 d X0 V* Y& W' t$ A ask turtles [
. T. ]7 n) A1 I3 y6 [ if energy <= 0 [ die ]& l8 s2 O! E& _. x1 \) o
]
4 V# t9 l$ l' X2 B, _) o' `; ]end U* o, m% I: e% Q' z
to regrow-grass
; q& y9 ~ w9 K9 `7 _, v8 H ask patches [/ B. {. H" K, @9 p g+ ?2 _; ~
if random 100 < 3 [ set pcolor green ]
2 W# b( A) c" I ]$ n- Q* N) N5 ` B# k* q8 ?
end, O$ X, B0 ]( ^5 Z! M) f
to do-plots
8 E# m! O4 ?% R t: q: S: W set-current-plot "Totals"# v! F) { X0 w1 S
set-current-plot-pen "turtles"
$ d! J R) O. i' Q' p plot count turtles
/ `1 _6 v, d! ]2 [$ Z set-current-plot-pen "grass"9 X g) R) {% g1 E6 ?: f
plot count patches with [pcolor = green]% H# C; L2 B* s% C0 q
end
5 W' x; E, w9 B& w可是运行时提示no such plot: "Totals"
( T4 S+ i( l8 `. A6 ?2 K, G0 ?error while observer running SET-CURRENT-PLOT
: Q! b: L. W: {- N0 z called by procedure DO-PLOTS, K* `0 M0 _* i- t0 R
called by procedure SETUP
$ ?# B( Z9 S) V4 H called by 按钮 'setup'& B$ H, N U8 j' n! K
求大神解答啊 |