我编的程序如下turtles-own [energy]" q$ i5 h2 w; @" V+ G& d
to setup
?% K; o/ r' F. q* U$ F clear-all4 ?, W$ E, }. k
setup-patches ]& `9 H" y+ [- M7 [& i3 S
create-turtles 100" F! r' O* O8 ^2 _3 w% Z) j
do-plots
. v7 e. ^7 S3 _6 i1 y ask turtles [ setxy random-xcor random-ycor ]/ A9 d* k- [1 E+ n* `/ }1 |& p! }$ ]% H
end4 Z$ M- {: d& R
to go
+ t+ w8 r: I0 O J% h move-turtles5 O) U J- w# p) b+ q1 a* Y6 X
eat-grass
5 L, M9 m* ^6 a. q' A reproduce
T& A/ r8 A3 }/ K0 l. ^ check-death8 A% _5 ~+ Q# @/ z5 L. c7 e/ @3 c
regrow-grass8 y0 d' ~3 |4 ^, _
do-plots' o% u2 [5 c! w" T2 C, s% o
end2 x1 M; ?1 p: R: q: i
to move-turtles+ h7 q, Q: Q* F" c6 o. c
ask turtles [) T$ J- }0 }1 q# g+ d
right random 360% C1 W( \0 E: c, q' j+ ?7 ~
forward 1# O* S8 u" a: O* Q2 D: W, Q
set energy energy - 15 d& s$ O: T+ k: h3 ^1 l
]6 t6 ]$ P2 W3 \. u
end/ R$ i, I& y0 P1 L }
to setup-patches
6 g! M" r: n' w1 t ask patches [ set pcolor green ]4 ^$ P( [: k! _6 C/ j
end
. f8 a$ C) J: p( E2 ]1 qto setup-turtles8 i5 s0 o- w4 K/ p4 V) N5 |
create-turtles 1006 `/ p- X% z1 `/ r2 R$ T" h* K# i- E
ask turtles [ setxy random-xcor random-ycor ]
$ O. l' z4 X2 u- ] e# iend
6 v. {6 N& G: Tto eat-grass' l4 y. p- h' A
ask turtles [7 [- p0 G( `# d: P. b+ H
if pcolor = green [
6 c0 ^8 l1 W7 Y( R& { set pcolor black
( f' Q/ `9 `. k- l& r. ]( K( p; E set energy (energy + 10)
7 O% {8 h! S& D, O+ s ]
! L) J( T1 t* B- q0 {+ u ifelse show-energy?
. ?% c- K1 _. Q; Y0 E' A$ q [ set label energy ]6 i5 A3 ]( C2 {) N
[ set label "" ]0 V, C$ }4 ~- l* v
]
) u2 |, y# p, Z @- s5 e3 Rend6 n- M7 P& [; L1 U/ q
to reproduce
2 G6 W9 w2 b2 X+ u3 L' A: y* h ask turtles [1 }4 Q/ J0 f6 C, M# } ~' }6 k
if energy > 50 [
) U ?7 s0 c0 A set energy energy - 50! c1 p& X( M' F4 a/ T
hatch 1 [ set energy 50 ]
, Y; e7 |% M; q% U- H ]
- w( y; E# E" X" a9 F3 V* ^ ]) i$ g( i6 s* M% s* L
end& W4 N3 Q; M1 {2 w. L' M
to check-death
( o% y2 e% E7 N: s4 U; C$ {9 o/ t8 Z ask turtles [
/ z) a v* M% n5 J+ d7 [, {, n if energy <= 0 [ die ]3 S5 `6 S1 E# \& N
]6 p- S* b N9 f" |9 y' `0 v
end: Z# X9 [9 y3 A
to regrow-grass* v7 x6 o/ Q. ?+ E0 E* f
ask patches [
2 T# l5 B4 W- ? if random 100 < 3 [ set pcolor green ]
j) r/ B4 R! D% N- {! E# O. E ]
8 X7 s: S8 K! Gend( D) c/ w. ~7 ~! n) x" T# {
to do-plots
7 d) O: ]+ p3 N: `' j set-current-plot "Totals". V5 V; i! O$ P$ v. o$ E9 [2 B
set-current-plot-pen "turtles"2 M1 G! D0 G P0 G
plot count turtles
, ]' I1 O- R! E) \( k5 p% Z set-current-plot-pen "grass"; d9 v. I1 I- s. O3 @, U( ?5 I
plot count patches with [pcolor = green]& {7 m0 O( e+ o; M
end( o+ y" M" r" \* P
可是运行时提示no such plot: "Totals"
5 v, m" O' P2 I" D, b- p) Zerror while observer running SET-CURRENT-PLOT% E, P u9 b: y3 p: c$ F9 g+ G" J
called by procedure DO-PLOTS* L" }+ i* J1 G: N7 g, o0 ?! q
called by procedure SETUP
2 U$ u- H& w5 C( M; | called by 按钮 'setup'
, [, v4 G0 _- l: ]求大神解答啊 |