我编的程序如下turtles-own [energy]' P& F7 q% d3 T6 i; w5 Q/ e% ^
to setup
* ?4 M; N$ }, C2 j; ^ clear-all
, u- p) a# Z; L0 [4 F setup-patches4 X. O9 X1 R% x# \* r3 R9 l
create-turtles 100# C( l# u0 q' E8 _' W
do-plots
, ]- R( `% M5 y( P8 n ask turtles [ setxy random-xcor random-ycor ]* E+ C6 E# ?1 o) H! ]2 V" T
end
) [" [$ P! U4 N3 ~7 O3 q4 t+ zto go
7 ^/ _" L8 L* w3 X, {2 o1 ` move-turtles
" n0 B/ J" ]4 B$ `9 @' p- u& S eat-grass
7 j E' [0 B+ w7 ~ reproduce% U7 d" C9 H2 @% I/ A: E
check-death& }# g* r% A+ o0 ?$ Z$ h
regrow-grass+ b( w/ a: R7 U g6 D% \4 n
do-plots" x; o. r3 C& n4 E
end. ] i n1 O8 l' ]
to move-turtles
# m0 T. O! _( D5 @9 _: ~ ask turtles [
1 L2 q/ U7 v% d b, a u, W right random 360
: {/ `: Y% V( w7 o* m! F- [ forward 1
e, A1 k+ u. F set energy energy - 1
6 C# {5 w; |2 v5 F6 `# _7 d ]
4 T* A5 S1 S% {" l; @6 ^end
& \8 w+ c% A" f% ^: I0 Gto setup-patches
" Y; v+ x; u6 v ask patches [ set pcolor green ]8 v, M( w1 G3 d( ?
end
" I7 [7 j7 H* W1 Zto setup-turtles' z% ^" y3 A2 k* Z2 y
create-turtles 100* y2 i* t' l3 I2 t2 ?1 n; s- r: c
ask turtles [ setxy random-xcor random-ycor ]. p2 C, `+ y" M/ `
end# O* h$ Y* Q2 L* v* V
to eat-grass
! j& A" N9 x7 H5 {8 V( k% I ask turtles [
+ V1 n1 R* v8 J7 {$ Z; g: x G if pcolor = green [1 L7 m0 U! ], b
set pcolor black
' Y) s( ~# n8 a7 |5 x! } set energy (energy + 10)* z5 D: Z$ w4 G! D
]3 S8 e6 P3 i; r- _6 P$ x
ifelse show-energy?% l! G8 ?3 Q# T# e$ T: o7 `
[ set label energy ]* k! \" `7 `. k! U$ W; @* G
[ set label "" ]
% \" n! P& a3 |! y) F ]& j, S- j) F. d& M& b$ J6 V
end j% n. o& S! G# f# r! I# T
to reproduce
/ Z' |! [6 v: K6 [ I ask turtles [( q, H4 r$ U. G! `
if energy > 50 [
1 f& Y" q8 k) { set energy energy - 50* |6 Z' |" y- l- p2 d* v) t
hatch 1 [ set energy 50 ]/ j7 U% \2 D1 C1 U( X
]
# F. i) w3 W: w, Z9 u' d ]
( }2 v [: u" t* o' O' `9 ~end% v7 {3 ^2 L* g% k
to check-death
7 I3 p) H; h/ l! j/ K ask turtles [7 [7 y8 ~; L7 O m
if energy <= 0 [ die ]
n+ ~+ o! r6 E3 l$ ?: D ]
3 ^1 z; u- R* C# @# D+ H$ yend+ Q. V' |+ r3 y8 ?( \3 M k
to regrow-grass( u& @+ L1 ~6 z! u
ask patches [, h9 O" i/ c! a$ H" i8 w0 F6 b
if random 100 < 3 [ set pcolor green ]
' C# I& m! ]6 z) k& g( s ]
: g* N' d: y, Q9 I' {. eend8 V: k, V, C; H, `" X
to do-plots
# {/ b, t7 h( F+ K7 L9 i set-current-plot "Totals"
( s* y* r. i) L, ]2 G set-current-plot-pen "turtles") ^) X; q. q' R3 j
plot count turtles; F/ O) @) { |. F1 \: n& f L- x
set-current-plot-pen "grass"
2 B/ ? ^# P( @ @5 h! d$ D! h: W plot count patches with [pcolor = green]
% v4 a. h1 b/ U7 p. \8 ^end- |) E3 m5 C" |6 }0 m" b( [0 P. u; r
可是运行时提示no such plot: "Totals"6 n5 r+ b6 o: f8 h& z
error while observer running SET-CURRENT-PLOT
$ q( J2 v4 B/ q( K' w1 o" @ called by procedure DO-PLOTS- f0 b2 D7 v. [ [9 a8 B
called by procedure SETUP
5 f+ l) K0 D% \6 [% V called by 按钮 'setup'. ^/ H, d' w3 S8 I
求大神解答啊 |