我编的程序如下turtles-own [energy]* @1 |6 c+ v5 J! V6 {' C
to setup
9 g0 T' s) E R! T# e1 c clear-all
0 {! b- @/ n. \: }' P- o) W; } setup-patches1 w& e l' H1 b9 k# k% ]
create-turtles 100* }) s; m& i* [* b6 f
do-plots$ v: i9 t+ u# F9 j
ask turtles [ setxy random-xcor random-ycor ]1 X# N0 ~) w. u$ s
end
, p) E5 X5 e0 I. qto go8 F p! Z- }% r: j
move-turtles& A: s9 g" z8 O0 h' |' h$ W; _3 I
eat-grass S% [- W5 {1 K! F2 t9 r8 ~
reproduce
: K2 o0 r5 x& w. N* {- O" y check-death
) f2 l/ ]0 ?6 _1 d. { regrow-grass
. N& B4 ^$ a5 r do-plots) `) A2 n! g l
end/ t# \: o0 `( P4 b- e. D
to move-turtles/ k, S! n: K4 C5 j. ]( g
ask turtles [# C/ \8 m9 ~& Y" L; p. n! Y! n
right random 360; Z; u5 y' @% e4 \) b+ v2 t0 O) b
forward 19 b/ K4 V+ X4 a
set energy energy - 1+ ?, \8 k7 h8 ]+ H
]) a7 s- I7 s* E6 W- G1 j; j
end- _2 ^4 m) p; t4 Q. l6 Q
to setup-patches
G. ^8 o1 k4 V2 s4 [8 g4 T ask patches [ set pcolor green ]. c5 M+ L9 j! u _) h8 S7 |
end
/ W# ?/ [: ]5 q& p/ X1 `to setup-turtles
0 z) I4 J# `5 A' m0 I" k create-turtles 100
* P, f- q+ o: y8 g* [+ x- Q ask turtles [ setxy random-xcor random-ycor ]5 c7 Z1 ?8 g$ Z3 i
end( Q3 E: q. {9 R$ d0 q/ F
to eat-grass- z+ j; u4 [0 Q+ S- Z
ask turtles [7 b# x9 M' ^. `" e0 Y% n
if pcolor = green [
" p! G' G) Q; j" Y set pcolor black
( k- R+ Z& Z$ M% E, C+ T set energy (energy + 10)
* P3 `2 k$ {6 R5 } n ]
2 _( B2 S( g# H& ~! Z5 z8 x T/ K ifelse show-energy?
1 v- e7 ?# M/ q/ X" f, i- r [ set label energy ]
: |( k0 @- R6 T( `8 M [ set label "" ]4 D! W9 E% K) P
]
8 ?' F+ I6 U( G+ |4 Qend
$ _! P1 R, p- O( \3 K' T! t- ~to reproduce
}" N. l, d1 |+ ]9 h7 S ask turtles [
: y5 t6 ]6 n# ]- N( c+ O if energy > 50 [
( J8 i3 \- e2 }' ^% k set energy energy - 50
/ T+ S$ o4 @7 i hatch 1 [ set energy 50 ]
7 i; f) @2 y5 g6 {$ R, d# h ]8 J% q4 i2 z* l- |: @3 c
]
$ S. |( Q: V) G$ n( tend
2 Z" O5 Q9 m% h, A8 B0 ]to check-death# _2 z: ^, x0 }. z% y
ask turtles [, L& d0 o1 |) S2 N1 X/ t
if energy <= 0 [ die ]
4 ]1 W" t* i/ i5 e' Z ]* X ?+ }7 v2 i. D! ~7 _2 b
end; ?( |* \4 r) i2 k
to regrow-grass. ?% ^/ O1 ]% l* O
ask patches [# i# v% K$ c( B* H5 J+ ]
if random 100 < 3 [ set pcolor green ]
6 ~0 Z" ^0 Q4 q# `- n4 t, `* X ]
3 w) R5 A8 p/ o) ~end
/ k6 ]) H2 g! v( \to do-plots
3 z/ y2 w4 D8 K% l" i set-current-plot "Totals"1 h- l% P Q" h+ g1 _1 @
set-current-plot-pen "turtles"
' X$ p5 G0 R$ p+ Q* i6 T plot count turtles
6 | Q& p: H! Z9 N1 v* X+ v2 j7 z* Q set-current-plot-pen "grass"$ H& A9 i; X% A4 ~1 q- K
plot count patches with [pcolor = green]
& x' V, Q) z( tend9 Z. P" U9 z; y
可是运行时提示no such plot: "Totals"
. Q8 B7 J" p# w. N$ P" berror while observer running SET-CURRENT-PLOT8 S! O' z0 [9 P- V6 e1 x* a
called by procedure DO-PLOTS2 ]; }7 o. n) B+ }6 E
called by procedure SETUP
' M- j( r/ R# o" T# f* u% R, t4 d) ?6 I called by 按钮 'setup'1 M" W& Z S) s" p: R
求大神解答啊 |