我编的程序如下turtles-own [energy]4 v3 ~+ W: J- Q" R) s
to setup; L; d5 g5 J( T# l" p7 J' F/ q
clear-all, r* I1 s0 g1 |% F2 A
setup-patches# V$ _/ x4 F: w% K. u; Y
create-turtles 100
, @' y8 G) R- |7 ^0 z$ h do-plots$ ?' q% _0 K! d3 K/ I% N% ^2 s
ask turtles [ setxy random-xcor random-ycor ]
, V5 [4 l! I( {1 jend- u1 y+ i: _6 s, \
to go) Z" g' d7 G1 D3 F
move-turtles% J( \* B1 a1 x( B$ d% E, P1 o! j* m
eat-grass
3 [: A- } \" q3 I5 d7 l* k reproduce. T) q" B. m' [# E: T$ S5 ~& n
check-death
6 @# g$ M/ v8 @; H regrow-grass
4 E' A1 o! w2 a3 h do-plots2 ?7 N5 F* O( @, E! c; } Y
end+ ~ Y# V& y0 X4 Y
to move-turtles
% f: r0 x1 i3 @0 E& Y- r% u7 x$ h ask turtles [
- a! m4 ] p" g right random 360
$ C& z5 U5 C% C" q6 _+ d9 X forward 1( Z. R% O/ E& P5 ^. f" E
set energy energy - 1+ M7 r& Q6 P+ W" Q. d) Y- k
]
7 X9 j0 R/ D- I7 ~/ Kend
, r {6 L) m4 C% o6 U4 J" V9 bto setup-patches# R& H/ q e& Y8 ^8 H& ]
ask patches [ set pcolor green ]; G. J$ Y$ S: m j {, b$ S9 C
end. q% G5 {- s2 B, Z9 I: D
to setup-turtles) P& c% f# E+ l) q( r
create-turtles 100
- F! e) D p5 ~6 ~% K z2 o ask turtles [ setxy random-xcor random-ycor ]
/ t1 w# [: O( |end; a- t9 B" y7 |7 c2 F3 W
to eat-grass: w, D# S1 ^( n8 z' N& F' |
ask turtles [
; g! {5 G! q9 @& A- f if pcolor = green [
' C! K+ G+ t T# v1 |' b set pcolor black
! n3 e: ~' C0 D set energy (energy + 10)
8 E( x* Z% f$ A' H! Z# q; x ]
4 n% P, j9 n! l ifelse show-energy?
( V! y5 a7 C! B) O+ { [ set label energy ]5 `# S0 D( q& ?& f6 q0 X4 I: V) ?3 x
[ set label "" ]
1 n) w+ ]5 {3 y z0 V# T ]0 |3 n' A/ R2 I K
end
: x" w, Y7 x0 h, S: b' N. P7 g1 B# hto reproduce
8 M( L3 o H& t6 ~% v c" b5 a$ I ask turtles [* {! @" F; b& ?' G! W9 R
if energy > 50 [
' t8 l& |8 k2 [. Q- m1 A set energy energy - 50/ e3 b, N7 L9 X8 I6 Z6 R
hatch 1 [ set energy 50 ]! C: _5 g4 F/ c0 \ S, ?
]
- e) s, b+ T* I4 m$ U% [/ ~ ]! ? ?7 K0 P4 |' G n
end
$ e5 `$ D$ u( C7 ^to check-death% i% j( B8 q5 `# j- L ^
ask turtles [
& F7 b! S0 g/ l, V2 h& y5 { if energy <= 0 [ die ]
. O; }5 H, d, J4 L) H0 t2 e- Y ]4 G) @* q4 k, h+ V! H+ h. o2 W0 F, [
end* B& U4 C' ~# j& {
to regrow-grass
0 D" W5 y$ K) M4 F ask patches [
) Q7 }2 X3 B* U8 j# U& k if random 100 < 3 [ set pcolor green ]
* E* Q4 T# w$ i- F9 ^" ] ]
9 a- T: M$ K( K: W8 _- A# dend" |# s0 a- o7 h; }
to do-plots
8 K7 U* M7 _, ~! a# f0 n set-current-plot "Totals"
8 W( v1 m% {. W) ]5 x set-current-plot-pen "turtles"4 ^1 v% N/ G0 X, y
plot count turtles
5 V3 K2 z6 s+ _9 ` set-current-plot-pen "grass"# \) k U( d* R' ^8 z" v
plot count patches with [pcolor = green]1 T7 D/ q; R4 T: o4 a. D
end+ q# }+ W9 [4 |1 f: ^! S9 X+ {+ \
可是运行时提示no such plot: "Totals"
& v0 g0 g0 a* werror while observer running SET-CURRENT-PLOT
9 R! J- g1 g4 d5 g+ a; l% J called by procedure DO-PLOTS. a% N: ^/ y9 C/ o0 s6 s
called by procedure SETUP
* C4 ~: p5 X, z called by 按钮 'setup', I/ [ u/ y2 c* h2 e p' i
求大神解答啊 |