我编的程序如下turtles-own [energy]) U6 Z0 D" @* ~- j5 a- n
to setup- k# ~4 h' `% l# b/ x, {0 Y* z, H+ x; c
clear-all
+ s( f) z9 Y t" O. ^ setup-patches. z6 W* z! b% [
create-turtles 100! i% g# _5 n- T* c& c
do-plots
1 S. ^0 C, N9 [$ n ask turtles [ setxy random-xcor random-ycor ]
; m u8 j% e& _, ]9 E$ @6 n( Jend
: d) s g2 D1 W# d% Y, p0 nto go
' T0 {( v% j! Y, H4 _ move-turtles7 C. o0 d/ C! o; {& O9 ^
eat-grass
I0 H+ I$ }/ e) y reproduce' X! C- v- F: F1 J9 F
check-death
' R! Y! {2 q1 H& r, z& K/ S. Y& _7 E. A regrow-grass
. x# w$ E. \8 ?. y" p do-plots
: B* G& _4 N& }* p' W; ]2 Q/ d* w, \end+ @# J* m0 ?: c9 ~8 t( F A
to move-turtles1 E5 u1 _( I2 d4 `* R7 r
ask turtles [& Z* b, f+ J' a" X6 d% ?$ P/ ] {
right random 360
2 m" p5 E7 s8 J( N: Q1 L& T% f8 \ forward 10 W: C' j% l- x2 F7 c
set energy energy - 18 S; p/ k' W; j, d
]5 X7 F' }; Q& X; O& @0 c S
end r' d M. i( I$ g, ?# |9 Z1 D
to setup-patches
* ~3 W8 W" K9 c; V t9 N1 U ask patches [ set pcolor green ] }- [4 d4 h" k
end6 z. F3 A! G# V
to setup-turtles3 L( t% C' J. Q6 O
create-turtles 100; @! h* A2 P# l+ e
ask turtles [ setxy random-xcor random-ycor ]2 r( D* W& S. b/ c. H
end
9 L+ b6 V+ ]# v7 Q$ `' q$ R0 d# yto eat-grass8 y# A0 T$ d* i Y5 {
ask turtles [
0 K5 y. M. l4 ? if pcolor = green [
- w9 m2 u2 F/ P4 }7 ?* g% J9 c2 B! a set pcolor black
: z) ~; | t) U h. t5 L% f8 p set energy (energy + 10)
/ j, y( \; N% S5 A' T! W4 k ]
3 x' i$ @+ d' S3 P/ b7 j4 c ifelse show-energy?. @0 {+ e4 ?6 f, l/ x& X" o o
[ set label energy ]( u h# K2 q: K" c0 q7 F
[ set label "" ]
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end3 u) t: F: i* b+ d% | ~5 d
to reproduce9 ~/ p {, a3 N/ u3 ~# g
ask turtles [
* O' ]1 c7 |( m! n' i4 c if energy > 50 [2 ~) A9 s+ w, z/ ]
set energy energy - 503 x$ G! e7 i3 s5 v( ~1 i# `0 p
hatch 1 [ set energy 50 ]7 I$ v0 r" w# d7 h2 }5 B
]
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1 P- n2 I( _$ gend
3 Y% \& k3 K+ U) cto check-death: h. ]. X# |" L `& S4 [. J
ask turtles [; S( l! w" i3 S6 I# K* \6 U
if energy <= 0 [ die ]
4 f+ R, v/ y5 y2 V/ u% z3 W ]
' J; l6 ^/ a9 l1 L8 T% A; send
4 e3 j" y* Q& H: |to regrow-grass
+ \2 O. H9 @- F6 e) V$ T! ` ask patches [0 n2 l" `2 n& K2 F! D
if random 100 < 3 [ set pcolor green ]! j7 j9 W; ^+ |) j
]* {1 x% k* Y2 H) ?# P
end, s$ y, m/ p6 t- }
to do-plots
9 ]* T; \; ]6 u5 \ set-current-plot "Totals"
k+ e B# g# k4 W7 x+ q set-current-plot-pen "turtles"9 b1 y# T; y1 l% j
plot count turtles
. z( S: O' t# c } set-current-plot-pen "grass"
1 s5 E- G- Y8 F# f z: B5 P plot count patches with [pcolor = green]
6 b( G8 P, a6 D2 u; Z- t& d9 iend& N' ?8 y: d1 p5 M" h
可是运行时提示no such plot: "Totals"
: c, P, ]# D3 u& I7 J7 l, r8 uerror while observer running SET-CURRENT-PLOT
3 z) d* h/ i4 f2 g3 s. n6 H called by procedure DO-PLOTS' G+ ~; Q; O$ L' m' Y1 [+ v
called by procedure SETUP
- q0 b) L& O( `2 I called by 按钮 'setup'
! }* d' _. m6 m& \. k' L3 h# l* [' X求大神解答啊 |