我编的程序如下turtles-own [energy]# _! u+ C" i2 x% ?. f; _4 G
to setup
% b9 l) R+ Q* g, |, F clear-all8 J; T. E. a/ Z! t
setup-patches
o* I5 Y- F0 n' n R3 T' w create-turtles 100+ D4 T) d6 Y% d3 n9 I# s
do-plots* s7 u6 q6 t, r# V, b- y: [
ask turtles [ setxy random-xcor random-ycor ]0 ^! \" ^3 q1 X3 y7 H. H
end
8 E2 }9 p2 s. i4 |9 e1 B9 R3 d0 U* r/ qto go
2 [, y U7 V% ~+ `$ _+ ` move-turtles
" r9 G9 C7 c6 {4 v eat-grass2 j* M% A3 l" }6 P# P1 t1 b
reproduce
' D( h9 }& U" K$ s! I: ? check-death
8 Y( l' i) w- s) }( Z+ G, W regrow-grass. E$ P; ~ G3 w2 A+ d! {9 J
do-plots
( v3 H: |; V R& jend3 r: a7 g$ Q+ }
to move-turtles
7 ~" x) W7 S; _* Q: z ask turtles [
. V; U9 m; q4 O2 M right random 360
7 V% |, B: o5 v% a& B# l forward 1: Z; W: F# P1 p
set energy energy - 1 W. p2 {$ K: ]& `8 l
]
7 `' N" g- a1 Pend
4 y8 d( A$ {: X9 o: x- jto setup-patches
$ ?5 r0 V& R$ [9 p" V. h6 } }! M ask patches [ set pcolor green ]
% p# I* R4 S, G$ V1 @2 q" ^7 cend6 ` b4 @4 Z* _7 r! I! @
to setup-turtles
1 { `8 C5 v2 l4 y% S- T4 n+ H/ V2 j8 i create-turtles 100; f @/ H& m5 \( P
ask turtles [ setxy random-xcor random-ycor ], g& @4 [6 K! u$ H% R1 |0 ~& ^' A
end
) y- D* @9 C" U+ V; \to eat-grass# Q7 m* f+ _# r! h0 d5 |& C/ j4 A# N
ask turtles [/ _1 x) b2 Q- o3 U+ A3 r; y
if pcolor = green [
5 i& g, W, c2 Y8 R. o6 V set pcolor black3 O! i( ~$ [9 g. e" f0 z) a
set energy (energy + 10)
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ifelse show-energy?
* F6 O) w1 G) T- w [ set label energy ]" C0 k/ ~- h6 O& C
[ set label "" ]
8 ?' _9 z8 A1 v ]
U1 T. s: y" A& q4 Z- {6 h9 dend
. w( |4 W3 c2 |$ N4 ?; t( Z' yto reproduce _# [$ ?2 w. h$ P, S1 o; t
ask turtles [
( _+ D' R2 g3 F; Z) R/ G! y if energy > 50 [
, i9 m* y2 k0 {1 h4 {+ F set energy energy - 500 G" A: \& i* m% ?
hatch 1 [ set energy 50 ]
9 }$ |/ S, K6 a! D1 p ]
W* H- w( V) s% L+ D0 v, T ]
, [6 T/ X" S" m( w; V" B1 F/ b Cend7 ?' s' d/ c y, m7 B9 J
to check-death i! R5 o+ h* I1 [5 r
ask turtles [
8 k# |. j+ E2 C5 k) F if energy <= 0 [ die ]8 ?6 {5 } S( N: @
]
- q% I' ~5 x& R& }end
/ X, e4 i3 @' P7 m! ^to regrow-grass
: ], v" [8 f+ Q4 G0 C ask patches [6 i' J/ d) e& u: C
if random 100 < 3 [ set pcolor green ]; x( c' {6 A4 D+ C. M4 U% h
]
# E9 O9 r& M; f# c+ U- }/ |end
+ J | D8 H5 T. W3 ~, {to do-plots
2 H6 E. ]& s% h( ^! [ set-current-plot "Totals"" D# F6 o6 @( V4 c- I+ [' u
set-current-plot-pen "turtles"5 S5 g) P" v) Y- i% v* _- B) W
plot count turtles
* ]0 T b0 L7 f) a set-current-plot-pen "grass"
+ y4 G: @! y0 Z+ ~ plot count patches with [pcolor = green]3 J1 p2 I' p5 v2 }: }1 R0 ~ c
end
& H, Y. m) V9 T- h可是运行时提示no such plot: "Totals"; C5 a) q. J; i* n" G/ j
error while observer running SET-CURRENT-PLOT
0 b, B$ b/ e* L( F3 A2 q called by procedure DO-PLOTS, x2 s/ E+ n0 n$ _; S0 ?0 Z( C
called by procedure SETUP
Q+ p3 W8 V4 o0 M3 F1 O called by 按钮 'setup'% m$ l- d6 o: v. K& g
求大神解答啊 |