我编的程序如下turtles-own [energy]) X( M, g, l G8 @$ l8 L
to setup3 [6 w3 |2 [+ K0 W+ }
clear-all
5 p, a; |; c* j- c. d+ W setup-patches
1 J& R% z: {0 i: e create-turtles 100+ F3 j; x2 U. E5 C6 t' U
do-plots6 S, D* ` _* P' V0 [# [5 A7 ]5 r" q
ask turtles [ setxy random-xcor random-ycor ]
" D8 ^ K7 D4 u( qend; P& Q- J3 p4 N) {: o$ p6 _' T
to go
" O6 l/ g1 } h7 X2 {( T! j1 e7 L9 N move-turtles
0 M4 u! [" v, `: L% R/ A eat-grass
! R* o- h: y- G5 ?% C; {8 W) Z reproduce
, P5 e8 J2 y! O; z4 N9 Y: D check-death
9 T- e! r2 f/ \, i5 O regrow-grass
$ [3 c# Y3 j5 m do-plots, n0 U$ i7 H9 @- y; |% f
end6 a6 k( [' t( o w
to move-turtles
5 ~- n3 B- u. r. T& ` ask turtles [
) }* C% Z7 ?4 M: j; s right random 3603 p( N( k) z4 k; A
forward 1
& m) E m: ?, A: B) l* ~6 m set energy energy - 1
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end$ Y/ h; h6 |, Z2 n
to setup-patches) o* @, e0 J4 C; }
ask patches [ set pcolor green ]
* s: A2 n% n3 q. @$ s0 Z5 |$ b) Lend
; A% }1 G7 v$ i# h0 O% h/ |% Uto setup-turtles
- u6 g V( Z2 q$ }( Q. v2 @" ^ create-turtles 100* t* G4 k, c. ^) e# M
ask turtles [ setxy random-xcor random-ycor ]& o) ]) @: U; Y3 D% Z: z+ t( p
end& H( X- G3 N) J- A, ]& T
to eat-grass
, l7 }+ @1 B9 I5 I1 X8 T ask turtles [( C4 e" f- c4 I9 R
if pcolor = green [
* q* j6 d2 d* j7 u set pcolor black
0 p1 z& s8 E7 \) H set energy (energy + 10). \7 h4 d! Z1 R# v( A$ V1 I! D5 H
]# b& G" b& j2 r! F' f* p0 J# p
ifelse show-energy?) W! r) [3 E1 G) v8 p' v+ U: S
[ set label energy ]7 B y) Y! \0 m9 C2 M
[ set label "" ]
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end e E, ~3 o% i- P' x+ m2 n% @
to reproduce
3 a4 r9 P' C0 q' p2 l7 L0 b5 r ask turtles [& s$ O' P+ d' d; T
if energy > 50 [5 H8 @1 w4 f1 r( h% g5 H
set energy energy - 50
* V5 Z2 n9 _( [' ^7 Q' q hatch 1 [ set energy 50 ]' X, ?$ d2 c4 s( {' n
]
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end
* c9 V' j' c* R# A# ?/ x) m, Lto check-death4 x8 c/ R6 l, R+ `1 Q
ask turtles [ k! ~ z+ p( s
if energy <= 0 [ die ]
* l( M$ y& _# p0 Z& j1 ] ]
; B: I. I& B- ~3 eend
( h, u3 S/ _# xto regrow-grass; x+ c2 {) ?/ G
ask patches [
/ q$ r# W6 o( O0 B. N if random 100 < 3 [ set pcolor green ]
# Q* b1 w( j' D6 e ]; W. y0 e% _/ J; n3 H6 M& P
end
. b* O3 X6 N) {to do-plots" p6 N0 x& O0 K
set-current-plot "Totals"1 w# \, T& i4 L9 b/ | `, \8 t7 s
set-current-plot-pen "turtles"
7 w; c9 b" t- s+ u8 }0 B5 c6 ` plot count turtles% h, g t' d9 [ N; r4 i# k
set-current-plot-pen "grass"
8 n4 N( v; M" V2 J plot count patches with [pcolor = green]- {! C8 t! z$ ^9 u8 }
end5 D B/ O7 v- z* H6 f; `# e, L
可是运行时提示no such plot: "Totals"
# V8 W- y3 ^8 G; H$ I- gerror while observer running SET-CURRENT-PLOT
' D3 ]& }) `/ ` T% r called by procedure DO-PLOTS
" c; _( E- z( W7 I+ T' } called by procedure SETUP
* @' l( \9 T; k. q called by 按钮 'setup'/ h& W. D( y; ^7 f4 ?
求大神解答啊 |