我编的程序如下turtles-own [energy] _. |. d4 |$ l `" w5 r
to setup
+ g, ]4 }, z6 g1 K9 S clear-all1 ^+ m) u$ j+ g' m1 Q: z) L
setup-patches- c2 s8 D+ t1 @) |1 v: T/ H; B
create-turtles 100
% D, M2 L+ k" W4 T* D* s do-plots
; F- M* v0 a& {# l ask turtles [ setxy random-xcor random-ycor ]9 E4 V0 A: T$ p; Y
end
/ l9 g5 O! F4 v& k: W) j* Wto go
! t1 p: Z" w. q- _4 U move-turtles
. j* C3 ]6 F2 z' B! t% y6 g eat-grass
. u% @3 t0 Z0 L( _& D$ ? reproduce
7 W/ X, m) R- V+ z4 G/ } check-death1 ^5 I2 p8 C% N: E, i9 m% l
regrow-grass/ S; J; x3 T' ~/ b' G* ~
do-plots" X: X8 H/ T* X3 T d0 x5 `
end- d. ~9 j& H6 Y% c8 u# f
to move-turtles
, ]! Y1 A8 x$ T ask turtles [
. ?- A2 v/ g' K( v right random 360
+ Y# A5 b _8 u forward 1
0 B( g5 O9 W* o1 N j set energy energy - 1
* j, z4 {& S4 j- T ]
8 m6 y I# h, G6 M" Eend5 a8 q: ?/ v2 T1 c
to setup-patches" q- {' [- [7 _" ]2 @
ask patches [ set pcolor green ]
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`3 m) B7 T. p" dto setup-turtles) Y* J. W$ |1 W C
create-turtles 100
3 C5 l& a2 \5 l2 M1 o! x0 q; Z ask turtles [ setxy random-xcor random-ycor ]' Q3 W) U1 t6 W3 i
end0 M+ H! b# i: p8 _
to eat-grass
# \9 Q' k+ f, W' |9 v ask turtles [( B1 B. \% U' W
if pcolor = green [+ q4 a. P0 Y: U% M. T
set pcolor black+ L' D% c+ @2 _
set energy (energy + 10)8 y: q0 G! `0 D1 w" O: G8 P; u
]
! b E5 I1 _5 V$ `+ z ifelse show-energy?
5 T# ~$ l2 U: F5 O5 M2 V [ set label energy ]7 e; j/ L9 h( t6 O/ R& V B9 q- P
[ set label "" ]
0 C" y2 w4 I+ F ]! x4 _& [3 D* i3 K9 K
end- d, b. X' ?. H
to reproduce
# K- s; l0 w" N- P' [6 k ask turtles [
8 h( H4 W6 u# I if energy > 50 [
0 _4 k$ ~6 i" e$ r. Y$ F+ [ set energy energy - 50
) ? @ l" d x5 R4 R: S hatch 1 [ set energy 50 ]
7 k. c8 t$ p# X2 _ ]/ ^/ p5 l0 s& R% z" n! ]0 _# S
]( E# t' I+ d# F \
end
; x- }. Y& f. Kto check-death
. D* `6 h$ O) d d5 r9 M" `; @ ask turtles [' D7 [" @* T6 |2 a+ V# J* `0 K( Y0 [
if energy <= 0 [ die ]
& W- m- N/ n% a2 Z# B. O ]0 @( d7 F+ g! }0 s
end
2 T+ L7 y; T* o+ a$ |to regrow-grass
2 p8 i/ P8 @8 c/ z: h4 ?8 S K ask patches [8 t. P) K/ A" R5 Z
if random 100 < 3 [ set pcolor green ]
. y( V5 S: l. n8 ] ]; c/ F2 f" G' d
end
8 A. C$ B p+ hto do-plots
& H. t- ]# m) Q& ^# Y/ | set-current-plot "Totals"
, m( b5 ?! [: I1 n& d, H set-current-plot-pen "turtles") z" C9 ?! m& [
plot count turtles7 N' Q2 e# o& Z0 E' S- P
set-current-plot-pen "grass"9 I* t+ s9 j( I, n& l, t
plot count patches with [pcolor = green]" O3 N; i& n3 C g
end
4 M# w2 ?& ?( ]可是运行时提示no such plot: "Totals"0 y( _% y8 X8 ^
error while observer running SET-CURRENT-PLOT
6 r& I2 M% x. `3 w3 ` called by procedure DO-PLOTS- L2 J' _! k& u+ A
called by procedure SETUP8 j$ m% Z! C2 l- P, D9 j
called by 按钮 'setup'" @$ }- X1 {! `3 H+ }& W1 h
求大神解答啊 |