我编的程序如下turtles-own [energy]
# I. v7 ^/ R. p7 B Oto setup
( X F0 d E) N) y! [ I. T clear-all6 g: f2 y5 [# j/ ^
setup-patches
|' r0 t* T" H3 d: g4 j( S7 ~ create-turtles 100
) u1 C: E; L( B6 c, I do-plots; ~6 T' D) e1 S1 | U0 }: H/ R
ask turtles [ setxy random-xcor random-ycor ]
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to go
+ n9 K) o X3 F" s* X move-turtles" f" @( A( r; o- [8 p' }
eat-grass
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check-death# h& J _( _' O- ?$ b
regrow-grass
% y J5 ^3 g2 y8 L) E do-plots, N6 ?! q, d; w& u
end
0 M+ X% v2 {2 u' e' _# }) W" J& pto move-turtles v+ T1 U. b: V! ]
ask turtles [0 J9 ]# k b! k4 P, N. q
right random 3606 ~+ T. Z4 u: `6 Y1 ~
forward 1
( J4 d B7 C x8 p" S: D set energy energy - 1
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# F9 T+ O; Y: ^9 ~+ J5 b5 ]end/ W/ e& Q3 |6 q) w1 z, X
to setup-patches: H, ]( `( z( g' `
ask patches [ set pcolor green ]
- B1 G9 |) A8 |9 c" ?& g/ nend1 y0 P5 q9 q0 L* B
to setup-turtles
* [, N* z2 t; l" k3 ? Z: @7 [ create-turtles 100
4 w2 L! r0 t0 q# I7 a: P ask turtles [ setxy random-xcor random-ycor ]
/ ~$ ?) c" y+ `" _end& x$ _/ p2 `, E# R' t
to eat-grass$ b: b5 s2 k% O& H- M
ask turtles [
& l" b6 m) F) k) U5 p+ K, V if pcolor = green [ J. p5 y' S' T# [% W8 G, b8 v
set pcolor black6 _) R% A2 S) t! E6 B
set energy (energy + 10)0 Q8 [1 K) i9 c G
]
! N: x: n& ]; { ifelse show-energy?
( n) P* L. _7 ?# z5 g7 J$ S) v+ x [ set label energy ]8 v0 o/ m2 x! K- u# @) i
[ set label "" ]
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2 o A+ C) k$ J0 k, B* Pend
0 @4 p" ?6 w8 @+ k0 d3 Tto reproduce3 Q7 i9 ?) z7 d1 P
ask turtles [3 y, _- z) F* U& Y9 y' r
if energy > 50 [
1 e0 U7 b2 u' Q1 U% Z9 q set energy energy - 50' B& p; f4 B6 n- n' [9 e
hatch 1 [ set energy 50 ]+ O* }7 z0 S( n" u. t1 I4 y3 R
]
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end
& K7 }' ^% r5 r/ i) \# eto check-death( F1 r8 X* D ?( c
ask turtles [
% f: g+ s8 z- y& Y* q if energy <= 0 [ die ]) J. s1 i+ b+ O/ s- i
]( e; y0 e/ V) ?+ d
end/ C1 A, Z$ k7 }+ h5 w, p
to regrow-grass% L1 L2 R) F0 K& ~' Y
ask patches [) ^3 _0 s+ K$ g7 @: ~6 F
if random 100 < 3 [ set pcolor green ]
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4 q" ^8 E6 P* B: mend: ?5 `: E+ v, ^" d4 j. w& O
to do-plots
h$ O, i# P( p% y6 r- d set-current-plot "Totals"# b. b9 [* H# Q9 W
set-current-plot-pen "turtles"
8 Z5 E; N1 A) r* D" n! S2 u plot count turtles
+ r/ ]! ?: \& F8 f; L" O set-current-plot-pen "grass"
4 [9 \7 ?. F! E* D3 v9 R/ r plot count patches with [pcolor = green]
. c# w& m; _* s. `) [end/ u/ F: K+ A5 W* n/ v5 Q, m+ ?/ L
可是运行时提示no such plot: "Totals"
9 g+ p# ]" u' f- T# lerror while observer running SET-CURRENT-PLOT
`/ k5 {) _$ Y0 H1 u" J called by procedure DO-PLOTS* k- P4 h. H) R& w* q
called by procedure SETUP
% K8 L5 e1 Y7 N9 U. }- ?# ? called by 按钮 'setup'6 f R* U! E. p
求大神解答啊 |