我编的程序如下turtles-own [energy] B+ `$ [0 [1 G6 k. s
to setup+ e. s- Z( H- Q/ n) g5 c
clear-all6 D4 o' n' [$ q6 h1 h
setup-patches
! T. s4 j& _2 ~9 ]! v; l/ W- w create-turtles 100
4 `8 W, Z+ q# _+ V4 V; d do-plots
# q M' W8 R; j6 H2 r8 I ask turtles [ setxy random-xcor random-ycor ]6 R, b9 [1 w8 g+ \$ [
end
& p: f% \1 z; B- f4 Cto go
8 }& n/ }3 d0 x3 j! n" H move-turtles( b6 R1 Y- H! W i9 X3 O, y6 y" p! [
eat-grass
( ^$ P2 S9 n- c: w reproduce
+ R9 ~2 Q, a& V/ H. ^+ C7 r2 Q) S check-death9 v' Q6 u' v4 j: e
regrow-grass" c) O& s$ r- a, N' f; F: g
do-plots. h6 ?+ r$ P/ m" }: S8 R
end2 H$ k2 @$ e5 T) H" d. o/ S
to move-turtles
$ Z3 k: k, A( N0 L, u: V ask turtles [
/ h, |( Y7 v7 m( E f/ \ right random 3605 Y% \; _' m1 w; r K9 W
forward 1
" R2 E+ y4 O L2 r; O5 ?- z set energy energy - 1
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end
7 \) e) i! a: E% f4 kto setup-patches
( a6 i& N5 v6 E9 }* K/ s ask patches [ set pcolor green ]
% B$ k1 m8 J/ a& n" L. P6 f) Vend' E# h0 x. ?9 M# l
to setup-turtles
; Y7 f& o% v5 X( O, Y9 H, i$ w create-turtles 100, }4 ?( Q$ U$ \3 N7 r$ H ~
ask turtles [ setxy random-xcor random-ycor ]% t; _( u+ A3 q$ _/ }- |9 h
end
/ j0 g: I5 q4 U2 z! y, S6 d, i& bto eat-grass
6 |8 X! D$ W5 r) s: R7 D# r ask turtles [
* B* y; j: W# O5 y if pcolor = green [
* n; e& ^: u5 E0 {: V; b set pcolor black3 Q8 k( O: ~$ |/ g
set energy (energy + 10)
+ ^1 F; ?, |# @ ]6 t( C% ^( \. B m
ifelse show-energy? ^7 ?* B1 @* U0 M1 z
[ set label energy ]
( b; |' c% r6 j [ set label "" ]
( t* `, @- q! J. f g7 q ]
8 G. }( L3 \; A9 a. }$ dend* L6 I3 G' z. ?" @5 T
to reproduce8 o3 V' G9 h- i |0 F1 z7 O$ s
ask turtles [% A/ X, z) Y5 c9 ~7 s. M) Q5 H
if energy > 50 [) J( J, I- u, K4 B) s9 { Z7 }+ d
set energy energy - 50
3 w2 N/ U' B, p3 A hatch 1 [ set energy 50 ]! b% Z* P7 i/ w; s; z5 q# \
]' s9 Y$ L: V L2 F- a- Y
]6 d8 J3 V, n" X, h
end- m' q1 g8 B/ Q$ @
to check-death& x2 k, [( K: R; \: ]$ u
ask turtles [& Q: G6 v2 K; B+ \3 t, [
if energy <= 0 [ die ]# t' v0 p' K1 e2 z. C
]. X* k* f v; H1 P+ E
end
, `/ q; c7 @" ?3 D* `; p% mto regrow-grass
6 v; ]4 F- Y+ I+ |; B5 ]# d7 ^( ~ ask patches [5 q. ]/ l! n5 B5 @ W# z
if random 100 < 3 [ set pcolor green ]' Z. s5 j% r; j7 z( w
]. S; J* U( j/ @$ h& {" o' W1 ^
end4 a o; U% ~- z+ i% ?
to do-plots
) _( O& C4 N, U) m5 M set-current-plot "Totals"
. o! u N) T. o2 z4 z set-current-plot-pen "turtles"! B. N/ A ?& }3 h
plot count turtles1 j% Q9 D5 F, C3 j, T# r" k
set-current-plot-pen "grass". n6 w5 N L. e6 e* h( S1 u* p6 P
plot count patches with [pcolor = green]
1 J' X; M9 O/ y# h9 L8 `; lend
. Z9 H0 i6 F8 W# R% ^" R' _4 T可是运行时提示no such plot: "Totals". q/ `0 k) L+ ~6 I
error while observer running SET-CURRENT-PLOT
& D: ]" v3 ^- m m5 M C called by procedure DO-PLOTS
! k) r& F, B# C; x3 x) E called by procedure SETUP3 h* E' D: N: }
called by 按钮 'setup' n3 y! T9 B% }) j( L' F. w" m
求大神解答啊 |