我编的程序如下turtles-own [energy]
$ S0 J! W+ r" f1 O7 X# Dto setup# k8 O, Y0 F Q- h
clear-all
+ C& `. T0 S U0 r- A- x( q3 T setup-patches+ U) b/ a8 [3 z, N; S- [
create-turtles 1003 _; s! A! `4 K$ Y( M) `
do-plots( z, U0 K7 {( c F( a+ D) g6 w" c
ask turtles [ setxy random-xcor random-ycor ] u; x/ y; m# W4 p `- }6 ~
end( i/ m4 D, Y% f |- R
to go
' k4 h. v. y# n" ?1 ^8 M move-turtles
5 ~ L; ]! ] N2 o [' V eat-grass
9 s' w" y h6 D0 I reproduce% Q0 }0 ]; W/ N& ] _5 N6 I8 h
check-death) S i: p; c. `. V( y) B; c+ c1 h$ ^
regrow-grass; U. m% E, ^4 d8 b. G* W! Q/ R
do-plots! O0 h' i% n" A
end2 E- B7 o" t# q, o* r" T- `- p
to move-turtles9 i0 M0 P2 t' G& @4 X2 d
ask turtles [
7 O& T0 P, M3 `8 B2 d2 H3 P$ z9 r2 i right random 360
+ X& ~8 R9 {6 J9 W- s D forward 1$ j: @; E, r3 s
set energy energy - 1' W9 s8 f) N- c7 f C
]. F5 p3 |# z A' f! E8 l
end
4 T) I9 Q& p2 U0 ^% { Ito setup-patches6 y. o& I* O$ Q* s
ask patches [ set pcolor green ]' v$ v9 Q* b, \; X9 a" b" |* y
end( o2 ^' y. J* \9 E6 w4 o4 k
to setup-turtles/ g# ?$ r/ m8 _% ] D' _
create-turtles 1000 ]- g+ A) L9 C& j6 K V
ask turtles [ setxy random-xcor random-ycor ]
, l/ G# b) `: [/ e& iend7 J7 o1 B) } X
to eat-grass
* v1 U$ a- j/ {1 ]( q* Y ask turtles [7 P/ m2 d7 y) \4 q9 S1 y! @9 k
if pcolor = green [. ]2 [0 g/ M3 `4 ]- ~ d+ \
set pcolor black! y9 g; B2 J+ q" I9 r8 {6 G* B2 r
set energy (energy + 10)
/ M2 d$ y7 v. G' i ]
- L- G& ?+ X* A+ Y" ]7 V# y2 e/ K* H ifelse show-energy?' z- x9 a* |# `8 W4 Z8 a
[ set label energy ]
6 N% c; B% j& D1 W$ B( j [ set label "" ]. \2 w/ x( L3 d$ y
]
7 V) Y) P% [3 |' V* U. Aend
- W2 r+ W8 V- J* W' K: \to reproduce9 o' H( g4 \- e5 T& }7 C
ask turtles [# G' d' T1 I6 ^6 c( j
if energy > 50 [$ J! B7 ?" X. G- ~# v& C
set energy energy - 50: q2 d4 X5 M1 ^6 i2 G5 b. ?
hatch 1 [ set energy 50 ]
6 D1 }& @& p! C3 O3 r: D8 _; M ]
% [: l i+ U; t- ?, |0 M z+ P3 s4 f ]/ m9 K A6 I( k+ y1 D4 |; d' X
end, E- Y4 c; g/ V V
to check-death
8 b6 Y- x' M" b& c5 S0 p" q ask turtles [
" g, } j$ V. K/ A4 m) p' ~ if energy <= 0 [ die ]
; {3 p& Q! ?5 _- \$ x7 F. ?# E- G" Q ]" [$ y# _9 N, M, G0 o& o# }' p
end
6 U; f5 Z+ E2 b& h& fto regrow-grass
9 g& p3 _+ {; k; B' P ask patches [
% O' W8 _, Z0 T8 h1 J7 f8 n if random 100 < 3 [ set pcolor green ]
& X; f) Y0 C8 ?- l* o- ] ]
1 T+ y1 A8 r( I; pend: O l" x t7 E
to do-plots* C3 P7 Y- C; p# T8 R5 g7 ?
set-current-plot "Totals"7 @- L4 ~9 q: V! v% [
set-current-plot-pen "turtles"
3 F+ p6 _! C% W. E' [- _6 J. ]' u plot count turtles$ M, @- O" |& S8 v' f
set-current-plot-pen "grass"- j& P6 Q4 T: f
plot count patches with [pcolor = green]
2 x7 H' R& Y. C* |; }end, Q% `9 S- n4 S# ^& U2 p' |- v
可是运行时提示no such plot: "Totals") z- S7 f& g+ }8 m- i: \0 a
error while observer running SET-CURRENT-PLOT* @/ m/ I! [( {7 p! Y
called by procedure DO-PLOTS0 h" s! T. k% v5 H: g
called by procedure SETUP
( ^- p; Q8 O3 ]; R; n! \1 g+ n called by 按钮 'setup'
% V) i" k7 B7 y% v8 J# g" Q求大神解答啊 |