我编的程序如下turtles-own [energy]" ]& F+ ]. I' Z, l( e
to setup0 m: U* l) w6 r
clear-all
0 q' H# g& @6 ~8 D6 a6 j) v- Z setup-patches
# j2 O/ ]8 Q5 ?* m7 l6 D t8 X create-turtles 100
. K& d0 `, O. T( U5 \+ T2 V8 i# ~ do-plots
7 }4 c. }9 w7 m7 V0 ^) a ask turtles [ setxy random-xcor random-ycor ]
2 {6 e' K t, ~5 I3 uend) E# \ B- s- J1 _2 u/ S$ w
to go
- Y) W2 B8 T4 ~# r move-turtles
) \3 t, p$ l( E7 ~1 d! ?/ w9 \. ^' ~ eat-grass
5 t) T1 Z9 l& p- K2 n' k% Q reproduce
# B; H* e9 Z- g7 O% N) P check-death' h( i: D5 l9 u$ _% e
regrow-grass
" _+ c- [: w8 k& {& c do-plots
: x6 q! u$ ]) Rend
2 x2 I w2 D) mto move-turtles
, a: \" E" G0 ]1 @3 M ask turtles [
/ I# M+ S' {$ d8 }5 R9 d4 f4 ^( V right random 360/ D' c. i# m' u& M( [* v/ J
forward 1# W( S* B& Y3 m$ N6 j
set energy energy - 1
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end) C8 Y, M% s' f: ~: k( n4 t! }
to setup-patches; p" r* F; ~5 M) @( [# T
ask patches [ set pcolor green ]
( r3 w; z7 {( p: dend0 f! l- L! M. @' U- Q# H% X
to setup-turtles& B1 J Z0 u' n0 X @
create-turtles 100 L w% P @9 J& ^
ask turtles [ setxy random-xcor random-ycor ]
9 q e" Z4 J a- Send
( O4 j; X& L. o/ R* vto eat-grass9 {0 T9 O+ v& {) `" }
ask turtles [
, d& F; Z, F+ C9 `- G if pcolor = green [
( |, ?5 i7 y4 B L set pcolor black+ p* O$ E5 x/ _7 j. A
set energy (energy + 10)
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ifelse show-energy?
- B' I2 h' d( O1 b! Y& h" t7 y [ set label energy ]
% i; z4 z, ?8 R1 K: d [ set label "" ]# @' o2 O& o5 `( h' p
]
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to reproduce
$ J) ]% C" S3 B& t0 M* p$ B! H ask turtles [
1 F! ~& T! s F7 ^ if energy > 50 [
) k- h7 C0 ~$ r' Q1 {1 A8 O# x set energy energy - 50
1 O3 H( @. A! R: C9 t hatch 1 [ set energy 50 ]
* y5 d) d% c/ g2 B4 O ]
! t# ^# Y8 L4 A$ G ]
9 I( w. W4 X% j% |end0 M& Q1 {5 q! `+ C Y7 ]
to check-death
) H- M1 l+ \1 j% [' C* R+ f3 Q- y ask turtles [8 n8 ~7 K# |7 q* g1 t5 v3 R
if energy <= 0 [ die ]
/ b4 B3 Z4 t5 u ~ ]4 t1 J9 B2 J7 o4 U- {
end
4 j, i' P' U1 X* T9 {8 gto regrow-grass6 O% R* y* q$ b h2 [( O: o
ask patches [
' A( i M, J$ j, N2 L if random 100 < 3 [ set pcolor green ]
/ x* H7 v7 B. O# G: l& C4 U ]
( b( v0 r9 V: Q e( t) g8 [& Fend7 L! O. ^6 y4 O) N5 _# m3 T" k6 s
to do-plots
. S+ O- m5 D, x set-current-plot "Totals"
" k) |* t# ]. l& l! R1 h& |4 `4 O set-current-plot-pen "turtles"- H6 k7 d; U9 e; E4 D |- m: W' _
plot count turtles
) D3 T8 H( f& q0 j* O+ C set-current-plot-pen "grass"
6 V+ ~, |4 p) |0 M0 c' X" D& n3 X+ k" W plot count patches with [pcolor = green], f" s* S' w( V8 C! l* P
end
0 Q( e9 S3 h7 X可是运行时提示no such plot: "Totals"4 y, [2 [+ Y4 C6 J& q
error while observer running SET-CURRENT-PLOT' l5 v' c4 a! a: r
called by procedure DO-PLOTS
4 T7 z. L2 Z& z; ~( F% I0 Q" ~ called by procedure SETUP
; m5 I! H; u s% U; p called by 按钮 'setup'$ v$ Q8 L) [3 \! n$ N
求大神解答啊 |