我编的程序如下turtles-own [energy] R% l; s* f* k+ E# R; ~% X# W
to setup
0 T, h3 c m5 w( O) {" x6 w: ~ clear-all% E! m) _6 ?' S e; q8 I4 ^
setup-patches
5 V+ d8 M. f: o7 N( A4 _ create-turtles 100. K/ y+ T& k+ i. E
do-plots
' O/ g1 G( y) x& G% }' Q" U4 J Z3 E7 K ask turtles [ setxy random-xcor random-ycor ]4 |$ T$ F: W" ?5 Y
end
- S+ M6 _! {+ B- wto go
6 d) ?4 p8 [7 M* P3 c2 b7 e move-turtles
0 B- |* y7 |6 j4 b, S& p eat-grass
% `% L% T2 o: a9 Z* F0 N reproduce
$ F# F k" s6 V2 l; K4 o3 t! U; Q/ K check-death
, c$ g! M; j+ Q" b c; j6 A regrow-grass# y0 m) ?# v9 W6 }- _) d
do-plots
( h* s! S3 U8 R. o bend6 o) O- {' y& R
to move-turtles
* S( D# z/ N# \' ?0 }" f- N& b ask turtles [; G6 Y* g) D8 K/ r' p; q+ G
right random 3608 F0 T" H5 H1 N
forward 1
4 z5 V: \7 G; d" b* k4 B set energy energy - 1
' F! i3 l# j N+ e% _ ]. |& G% r! P9 B% B: S& h3 l2 N
end. E- \+ ]' y5 X- G; Z
to setup-patches# I- t/ u8 Q7 [ R+ f4 }5 u
ask patches [ set pcolor green ]
/ V& Y4 ?$ z6 V$ Z4 N4 wend% n4 `3 q8 o( _9 P2 m, C {
to setup-turtles* D& A& Z! H, y) {( l0 E" l( W
create-turtles 100, D1 u: A2 i! ?
ask turtles [ setxy random-xcor random-ycor ]
. T5 s! K" U5 o- }8 S/ M% cend* O& [" v5 _. [ V
to eat-grass
4 _2 J# t0 @5 o ask turtles [
/ L3 S( w2 n# } w: K if pcolor = green [
) Y: f6 u1 Y8 @' b* i set pcolor black4 V5 B# {5 h- g" @
set energy (energy + 10): s! y3 l% ?' M- b
]
3 L/ J9 F/ }5 h7 J% ~5 M* l ifelse show-energy?% K: G) t1 T4 w% c% x& c& m+ Q0 X
[ set label energy ]
$ g' V7 O( G1 a [ set label "" ]
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end
8 e& r" [0 U. [8 Tto reproduce5 e. U4 _$ W) x4 E. p) ~: @+ K
ask turtles [
6 i. n* a3 ?3 K( [ if energy > 50 [
6 T1 C! B2 L$ l3 K set energy energy - 50
7 |8 x/ r8 \1 R4 Y$ ] hatch 1 [ set energy 50 ]( {/ B9 L( [- E* F
]' L! t- e8 {( U* A) |- Z, V" ]+ \
]
" ?: \1 `7 D' j- n$ O" jend
: B, {' Y$ I9 L$ k9 @/ h+ oto check-death
% Q! r5 [/ z& ? e9 r/ I1 {) Q ask turtles [" T# I: Q" P# F$ A J; d. \. i$ p
if energy <= 0 [ die ]# [. T: o' e# I* y. Z: |
]) h: H; m' v% E1 f! W) r
end3 e& V# h6 |( K4 q7 r
to regrow-grass
) S$ S2 P# F' I# N* `3 i7 ~7 K# y. y ask patches [ M+ i3 S+ p0 T' \ U
if random 100 < 3 [ set pcolor green ]3 k7 ~/ l2 {/ d" ]0 T, n
]
4 W# T* u5 l( ~; T0 v0 Yend
3 H; i* g! T6 }5 v! z" s1 Bto do-plots& ]/ F8 v# Z2 E4 y4 x+ Q$ Z
set-current-plot "Totals"
# R+ t# g2 R4 z$ T: }1 ^$ B) o set-current-plot-pen "turtles"6 X8 V- j' a- _; N
plot count turtles
! H9 Y+ x9 t T' B4 @ set-current-plot-pen "grass"" f& ]( W& b2 t. W2 w1 e
plot count patches with [pcolor = green]$ T I1 u9 Y3 W1 L8 D* b: X! L
end3 D7 z6 g4 N6 I$ l- ?; f. ?( T
可是运行时提示no such plot: "Totals"
* F) \% a9 M2 O+ b) Zerror while observer running SET-CURRENT-PLOT# R) H/ o4 Q7 _
called by procedure DO-PLOTS( w$ P' W3 S! B9 A) S) @5 }
called by procedure SETUP
( @2 C/ I: @$ Y$ s0 C( G& p" O called by 按钮 'setup'- e3 P, P- P6 d, `/ z N
求大神解答啊 |