我编的程序如下turtles-own [energy]
" [1 {7 x; ~% H- ?7 F* i' pto setup% C/ r# y# J) |- U9 T
clear-all
6 x- g" {1 [' l& y5 z setup-patches
; X3 ?, I3 a- Q, r create-turtles 100( J. N) ~6 S( m% V
do-plots
4 e7 e* R) h3 g* a h* s ask turtles [ setxy random-xcor random-ycor ]% d- z: ]) r( O9 @
end* z1 \. u5 e* j+ u
to go. y5 x7 M( C- [8 ? ?
move-turtles
# l( k8 w" U" y8 U eat-grass: y6 U( v0 L& S0 K2 q
reproduce( c. p8 A% ?$ @& U, {
check-death0 U) y. N& o) V* a! v
regrow-grass: w' _) B8 F0 q, j
do-plots: u9 ]: K% [# v
end4 @, V8 @7 f0 C. ]6 O# {( Z1 Z
to move-turtles
% m5 V" ?1 k: k. S, P5 l z, _ ask turtles [" {& j/ h$ d! `* l4 X" v
right random 360
0 e# j; I7 ?! P& H) P forward 1
% Z' v$ l. q& d* V* P4 p set energy energy - 1
% K9 n( J7 k1 U+ B- d# Z/ ^9 N2 x ]2 ^# K2 `: ?: [$ u+ ~' r; N! R; ?
end+ x5 R b' W8 r% j
to setup-patches
! A3 i) y5 k$ d$ e% c ask patches [ set pcolor green ]
9 k( g- S; h1 T6 C+ v1 |end
, U6 O& Y# a' ^1 P4 u) Rto setup-turtles
9 m5 Y2 W4 {0 z: G) r+ x7 ?# u } create-turtles 100* f0 }. S. ~- B4 }% b
ask turtles [ setxy random-xcor random-ycor ]( a6 @2 @! `7 ?- R, w
end9 ~& d7 r0 \ y7 r: b' _( k
to eat-grass
* r4 b# R% r& v( s9 y ask turtles [
7 ^. }( Q0 L) T: |0 F7 y if pcolor = green [
% ~2 o# X' j% N: v; f6 _5 P set pcolor black. F" T H8 q" P" e, k+ Y' B
set energy (energy + 10)
9 \; j! `6 X4 ^9 q ]6 y+ x* Y' l- h# k0 r( A5 ^: B
ifelse show-energy?4 c( U3 ^$ W: x3 l' M$ j+ g9 y
[ set label energy ]
, _2 \* u! V3 _/ f [ set label "" ]
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8 W6 x/ M* [) w: B% Q! ]: oend- `0 J; |* R, u$ P; T& O
to reproduce
! N+ K+ A( `7 b: J- D$ { ask turtles [
- `- m6 Y0 s( V2 r3 R if energy > 50 [. x7 X/ J: d+ c$ Z
set energy energy - 50; h. [$ C$ _2 B- @% O- j. O
hatch 1 [ set energy 50 ]
8 o/ _$ J7 C5 |+ ^' q1 t2 d ]
+ v) @/ Z3 @- \ ]
, J/ a% Q; l n- Y8 Y* Jend5 i' i5 ^! O$ `; Y" ~0 w
to check-death
1 H+ T+ M1 d/ n ask turtles [4 s1 Z" ~$ P2 R: ]% |4 N. A( G
if energy <= 0 [ die ]
2 k0 t. A- r- M) v% [( l" U8 ] ]; L5 R% }6 m5 O v* p6 |
end1 v% a! n* r0 i1 C" a" Q; ?; P) G# h
to regrow-grass
_: @& u" r' a ask patches [
/ e+ `! P7 r- R; e# C7 @3 ~ if random 100 < 3 [ set pcolor green ]
5 w# j! d& @; r# P# N) O& D ]3 n! }; [! V! c Q/ L
end
$ b) G: A1 T' o. fto do-plots
+ Z0 f: N& s/ l3 z4 a set-current-plot "Totals"
7 \, Z" n; ], Z! t! H0 j* X set-current-plot-pen "turtles"8 l* f' A. C3 l, g' B1 b% x
plot count turtles) ~3 R8 x3 g6 E* a
set-current-plot-pen "grass"* x! X0 G3 \+ }5 k, ?) D
plot count patches with [pcolor = green]; O8 o6 Y5 X' K
end
& K* s, E1 o& L可是运行时提示no such plot: "Totals"
. I/ K) T$ _7 v. I/ p2 gerror while observer running SET-CURRENT-PLOT% S- K% c" {% \
called by procedure DO-PLOTS4 ~, h2 T7 H! s: t5 n
called by procedure SETUP: W) p/ K- }5 Q! z
called by 按钮 'setup'
9 m5 Q( _1 j7 f1 }- q! a求大神解答啊 |