我编的程序如下turtles-own [energy]
# t: w* g2 H: i3 K7 xto setup
. C3 K/ A- K- x) b$ U clear-all$ k1 [0 _9 v0 N/ ~' n+ A8 z
setup-patches
& u {: R( [3 _) H# q( N create-turtles 1000 m, P: D5 U9 F* ]
do-plots- [% C5 Q: _" A3 X
ask turtles [ setxy random-xcor random-ycor ]
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to go! c3 s3 R# r: ?6 A6 j7 A
move-turtles
3 H& e3 F9 |1 w eat-grass
5 `7 @5 K+ ]4 h6 D* X# x reproduce
( E4 z0 S2 ], e i* \1 \ check-death' T6 w7 J' O4 h+ O8 |& D6 ^- b
regrow-grass- i/ o$ W* `% b+ x# D: G9 T
do-plots4 p' A$ P1 L6 ^/ ^4 h* ~6 Z
end
. x- U f O3 l7 S9 v2 O2 U3 W: rto move-turtles
: p. H1 q7 `1 [7 M% V ask turtles [+ a+ Y' m4 f$ T* F: s" t. s
right random 360; ~: r# `2 m" g: u
forward 1* r9 [! Q: Z( F5 W
set energy energy - 1
2 F, U* i2 [+ W d: W7 \8 |# c2 E% B ]
2 I6 O# H3 Q) y( Y- ~end+ b% w8 H r. s" S+ \8 D6 D
to setup-patches+ [+ q+ S B2 m3 L0 ]0 ~% D: p
ask patches [ set pcolor green ]7 F* G( c( @8 D
end7 G6 e% X- E' B8 x% j; B3 n
to setup-turtles
7 ^* C$ L: f5 E7 ^0 J create-turtles 100" A9 c! F/ f3 F8 l! p' x; N
ask turtles [ setxy random-xcor random-ycor ]
+ s; f, Y! t! ?7 h7 @end7 h, d8 }0 \1 `" B- `
to eat-grass( k3 n ] [; K: {* [
ask turtles [6 N6 V( Z: l: O8 r8 t: q3 D8 R
if pcolor = green [
/ a; `5 T9 Z; d5 @- s/ h N set pcolor black$ ?, g4 \* l, N3 \( k# ]
set energy (energy + 10)
+ b Y% y g# r: \# }4 A% G5 Y' | ]& n* N3 Q/ V# `# S
ifelse show-energy?
: W6 G! s( n/ _! V: n+ n9 P* | [ set label energy ]
2 a" r! I5 R/ G [ set label "" ]* i, @6 b6 p' V2 | v
]
1 P! S* D6 G& \4 [end
% R/ s9 R+ y: }9 y9 X7 w, Q- Ato reproduce
$ d P0 a) f, C ask turtles [2 o! s# [/ x: x7 {' ?
if energy > 50 [) ?- b& T* d/ e5 {+ T; p0 T4 V
set energy energy - 50% G% X( o* Z* c2 Z5 `
hatch 1 [ set energy 50 ]" G+ G) u. j& u6 \
]
; _: x9 b/ K3 E+ l ]
% Y$ S1 M, c5 y. M- cend1 W3 t. O8 ?% T: }5 Z& G {3 ]& e- `
to check-death
# B) a0 [) O- L7 @0 G5 T ask turtles [- v7 h) h6 B( I1 F+ F, h3 a$ s
if energy <= 0 [ die ]3 B' d4 O. L i: d* L
]
& Q8 a0 S; E+ }/ l8 m+ Zend2 J( g( r8 b; v. j: \, Z" Y% [
to regrow-grass
1 N; x4 N1 k4 r- D4 t; }$ g ask patches [
& G1 Q( `! [- l4 X% Y' [$ T if random 100 < 3 [ set pcolor green ]
/ i3 X( G, a1 ? ]
3 w3 ]* ^" z& O: j0 x- Oend6 \) Q( Y) p6 i" ~ J
to do-plots, L, t3 K" ]1 _7 J3 ?& t7 C/ {, ^
set-current-plot "Totals"5 R7 ]$ P% C4 W, }& }* Y
set-current-plot-pen "turtles"" I# a- a4 E! r" B' ^' j
plot count turtles
; T' t6 v+ U7 F" } set-current-plot-pen "grass"
' p$ q( h& ^0 `/ O; [ plot count patches with [pcolor = green]1 I, e! O1 Q% ^5 w) O
end
. W, ?; L1 F' ]! G* B可是运行时提示no such plot: "Totals"8 d# m! l% \. L" |5 t3 R* p! b
error while observer running SET-CURRENT-PLOT
" u) l: T" z. ^# B6 } called by procedure DO-PLOTS
) F9 X, ?3 E' j( B called by procedure SETUP
1 V$ z1 H0 Q; d5 f1 E called by 按钮 'setup'+ T: G; U8 S3 G- a* A; m
求大神解答啊 |