我编的程序如下turtles-own [energy]
9 U3 H$ t* b2 J4 X4 y0 }to setup
2 ~- g" K9 ` s' G( O& Z clear-all/ @" F, x) h, l+ u" f' V
setup-patches
5 z" P1 B- H- w& r9 F' Y5 ^ create-turtles 100 b8 w" o+ l5 a1 e; p
do-plots6 r9 P4 A4 A3 ]3 v/ n
ask turtles [ setxy random-xcor random-ycor ]+ J4 ^5 ]2 S n6 j3 j! t8 b
end6 A3 i7 a/ o9 Q. e0 \; b
to go
. ]; J+ j0 g. ~0 z move-turtles
8 z' h" r( ?; y" I4 O eat-grass
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check-death
7 m2 h/ q, M/ J3 p$ g regrow-grass* W* c: i0 |, [- @
do-plots
F" F+ Y2 H/ K: N) F" Eend% n) ~# B% ~6 Q7 f x) N6 }' e% x
to move-turtles$ x7 e1 J6 T* ]7 K
ask turtles [) R: D9 t( K3 y$ H, g( n
right random 3603 O* q/ a* L, b6 x5 n
forward 1
6 P$ F1 ?7 i- h set energy energy - 1
6 l( _% ]9 h" B6 q! P ]9 ?9 Q/ N9 n& ]4 Y3 N& q
end
: |3 M+ Y1 @/ `! b( s* \* l5 nto setup-patches
5 Y# t# n8 t7 X6 g9 d2 I' x9 |4 D5 I ask patches [ set pcolor green ]
7 Q: t1 S! j, U) y9 \* e' `end
5 r+ ?' ?% z; jto setup-turtles+ `3 s R% i1 Y! C% b
create-turtles 100
- I5 \) E, }" ^$ C7 r ask turtles [ setxy random-xcor random-ycor ]
}( j+ E& X5 |end' A6 V0 O: s# u, ^
to eat-grass
% H+ u3 \$ H" _1 R8 Z: s ask turtles [
% S, {* [0 X3 ` if pcolor = green [" p4 r/ l c: c3 w8 i& t
set pcolor black
6 s* c* ^8 e+ _ set energy (energy + 10)" i! h* k h" p3 I- J7 }7 S
]
) d6 n1 a0 q' N& s ifelse show-energy?
; ^4 ~7 Y& ?$ F( j+ m8 ^+ e [ set label energy ]3 C* m( J. f, i
[ set label "" ]1 t/ g' w- a; q! G3 Y! j
]# Q9 T% y7 X+ h- a
end/ w5 S6 p& d# h+ d) s4 ?
to reproduce7 k- @3 C; k1 ] A4 j0 o
ask turtles [7 G* X% M1 P8 H E, N d4 C: b- L+ {
if energy > 50 [
3 E; r6 S7 ?' n: o# V' N" Z set energy energy - 50
5 L7 k9 X( E4 ]; Z. B/ A& h hatch 1 [ set energy 50 ]& p( V0 B: J; w! D! u' u7 G
]- ~/ ?& O1 F/ [% _
]4 r( C( F D4 A3 [, `, \
end, B" |# |3 z" B# Q0 {* i( J
to check-death0 U6 y) ^0 \1 k! z
ask turtles [, ^8 T" }6 J4 n. a' _/ O/ l3 i- G" j
if energy <= 0 [ die ]6 G! S8 j6 f f. H4 H
]
- \5 k. @9 A @1 T4 j' Gend
0 ]9 r0 E6 r. d" _+ X, \to regrow-grass
1 R% e4 n& e5 e% I& Z( ]( J ask patches [/ H; } o. Z, Y3 ]. @0 y1 ~( |
if random 100 < 3 [ set pcolor green ]
2 O& K7 q0 P3 J1 K ]
/ Z0 i* s U$ h( Z) F2 c Yend* {5 W" C$ ^5 o* [2 z% H8 L
to do-plots
+ l1 A! R4 M" W3 o/ o3 E0 ^0 t set-current-plot "Totals"* [7 D6 w9 q7 U- b4 k6 T
set-current-plot-pen "turtles"" J3 i8 E6 s! P9 B/ G, r
plot count turtles
* a: J: v( d8 M/ D" W set-current-plot-pen "grass"8 \! Q2 z2 c, L7 T9 G5 w1 y" I
plot count patches with [pcolor = green]4 P9 p: X) \- t5 c+ s% [
end' E0 C* r8 u# Z$ u8 C/ \; M y
可是运行时提示no such plot: "Totals"
' v5 @5 m& {& w9 s# G2 X! derror while observer running SET-CURRENT-PLOT
^& r: Z& j. ] called by procedure DO-PLOTS5 B t p! l; o2 E- M
called by procedure SETUP
5 J3 U i7 a5 M' J called by 按钮 'setup', Z: {: @" ^# `
求大神解答啊 |