我编的程序如下turtles-own [energy], U S2 C& C3 Q7 L7 R Y# E
to setup* Z; V; p" ^- L/ u& q! m, C
clear-all1 Q7 m4 M6 b5 l4 N/ g. M W, A" M, K
setup-patches5 V# X8 D: c! e' m0 H
create-turtles 100
1 {$ f/ z3 g* F) I do-plots
. j! q" p) }( u ask turtles [ setxy random-xcor random-ycor ]6 Q) Q5 l+ q f6 j) Z6 ?8 h5 k
end
' x7 N5 m, g, z% M- R$ Wto go
7 ]5 n( Z6 p( j- C$ d& A, ~- C move-turtles
( p, k+ k$ m! a; X eat-grass
5 O1 k6 X; M' F1 L! g" q1 M: s2 o2 y reproduce
' }1 D& ?7 R v, l) e" C check-death
7 `; l7 ^7 C( {& k5 ~. W2 W regrow-grass+ q6 j- u8 ?( \( v0 k, `
do-plots
3 \' m9 y) M+ @! Qend& R5 o+ E1 h& ]/ Y, d2 x9 z% |+ Z
to move-turtles
5 O: `' z3 G7 O ask turtles [
' A C6 D) [* T1 ^: C: M right random 360; ~" Q- o# o+ q
forward 1
# E8 b5 K! k9 ] l9 Q8 Z set energy energy - 1/ I6 I! c$ E4 m
]
6 w+ _9 l* a% c! e+ Mend
6 I5 C7 Z+ K0 }/ Qto setup-patches/ V/ y6 {4 k* {4 y
ask patches [ set pcolor green ]& {6 t% O* o l6 [. w( o
end
+ {3 s5 C1 A9 T1 V6 h" uto setup-turtles: y/ O* I2 p7 ^
create-turtles 100! o) l6 H$ u5 }2 D) r
ask turtles [ setxy random-xcor random-ycor ]9 t; V" w, m5 j) R" u
end
. D0 p0 T4 E8 M |to eat-grass/ ^$ S! }2 u( F, y5 H i# ]6 u8 |
ask turtles [3 C2 R( k$ _0 K5 M$ q' @4 r8 }
if pcolor = green [
, b# b1 y$ {5 B+ O2 Y: ]) ~ set pcolor black
6 x; A7 x. Q( Q# b% U$ v9 @ set energy (energy + 10)
' P; o/ p/ x u% E ]
. b* c" A1 ~! x. F; |" V. u$ m, b( f1 w ifelse show-energy?
% x' X/ F& y& T# M" j; G$ T [ set label energy ], T9 ^# q4 I6 b/ V6 q
[ set label "" ]
8 H7 i) s I0 V( I1 a: F. L8 p ]: j. j+ ~* p# J3 M6 O
end6 M2 ~9 \$ \+ b; |( m% |7 }
to reproduce
% U) s( {9 _" v: ` ask turtles [
* c. j; D7 c6 k9 B# y1 E0 D' E- e if energy > 50 [
: j' P/ `2 M6 }& F: H9 f set energy energy - 50! N' J$ l/ L3 j M! a R1 a3 {
hatch 1 [ set energy 50 ]
2 z) W$ a4 d% S# E# j/ u ]
- \9 j, G- A [$ ^0 X | ]7 ] q# z5 G1 T& m- D& J2 o; o
end0 S4 l4 S, m7 ^' ^& L
to check-death$ U3 y1 d, ^( r6 ]2 d, B+ H
ask turtles [
% V7 r3 I3 S/ F! f" U+ f if energy <= 0 [ die ] j' }+ _0 \( g$ Z; [& J. H
]/ E# l% l: s" L5 x
end
3 V8 O+ D* t" ~8 t% Q. T) wto regrow-grass
/ x9 T! }* y# f$ _7 ^ ask patches [1 X, [; u, N) ~: Z8 i9 q! k4 V
if random 100 < 3 [ set pcolor green ]& _ j. J n, z2 J a& C
]. E' |. I' v# ]& m1 M; e6 O
end3 W7 k3 U" h4 H; F9 U# O$ i; u
to do-plots
" K! e, r8 i% n2 [# a set-current-plot "Totals". ]5 r. ~7 I) v7 b! m
set-current-plot-pen "turtles"
( Q. h4 G/ J8 i; V: z p) h' O plot count turtles7 [- v6 h- [4 Z p* [, U. ^
set-current-plot-pen "grass"2 b% J; O8 I' N" H# |) v
plot count patches with [pcolor = green]
9 o0 ?; k* H+ M) h1 ?end) F$ q8 z$ c! U+ G# T b
可是运行时提示no such plot: "Totals"5 \& U; n7 g1 S3 ?4 C
error while observer running SET-CURRENT-PLOT
: c, a7 N' _9 @1 E- m called by procedure DO-PLOTS
* W4 B! ?" F- }% z called by procedure SETUP
0 y" s0 d% S; o) s. F8 r$ V called by 按钮 'setup': N# U4 ^* ]; G2 f- |/ n- Z
求大神解答啊 |