我编的程序如下turtles-own [energy]& f7 B% e% J% o: c' g0 }; s7 u
to setup
* R q% U5 t' \0 ^) d clear-all3 a) _, {0 l% s% X4 X
setup-patches
. {. Y$ l: z; k. L" ~% g( | create-turtles 100
6 b9 K0 |+ ?( h2 }" o; } do-plots
! C( o* R4 S% s1 Y ask turtles [ setxy random-xcor random-ycor ]
( a7 Q! R2 V8 Pend
( I% h: A" K6 d. Z( w& ^6 a" O3 ] ~to go
/ v+ r: [9 }. U, {; ]) E move-turtles
. l7 X' f! D: [' k8 H5 h eat-grass4 s7 n, I! k" G- S* ^5 X
reproduce
1 @. D' H( w; H check-death O& m; D. x) H9 w9 I: H0 C3 W
regrow-grass8 h* k( N9 |& u4 t0 y1 V- v
do-plots
8 T! X+ X. ?) K4 g# qend1 {3 P3 V" @7 Q4 }
to move-turtles
) ?3 A) i; H8 X4 O3 ^% I8 G ask turtles [+ Q- Y4 X2 P* c$ x, g; D* I* ~
right random 360& y1 I% O& k4 w, P) o3 t
forward 1
$ c c0 h' T& }$ I. v/ R set energy energy - 1
: |) ]. P$ a* ~5 H7 q- g) A ]
+ ~. L- O3 O8 bend
7 B( ~, _3 q. u& {% i, Zto setup-patches
8 a$ j/ H+ X" T, J% L8 | ask patches [ set pcolor green ]
, \( h8 v6 X$ d) B" s( |+ x0 jend$ D* {$ v$ e' z! E3 ^& w9 X, M5 _0 i
to setup-turtles# i2 K2 L+ r/ m+ F/ n
create-turtles 100
: C. |7 C, Q8 L ask turtles [ setxy random-xcor random-ycor ]
8 [+ i1 w/ x6 V* ` U, Dend
6 Y8 K# ?7 |6 k0 U9 Y, Oto eat-grass
& z4 N( F) C$ q5 O+ a! a! E$ @ ask turtles [4 x! x& j, ~8 c9 N
if pcolor = green [
\) G8 B& F9 k set pcolor black
1 T% F, n% K4 ?1 Q set energy (energy + 10), f* R/ }1 v& u2 k7 m3 X2 U
]
, N( h' b8 x5 ]( l+ n( y0 h* [ ifelse show-energy?
# H& b/ D" u1 s" C) z [ set label energy ]8 ~* r# t8 t& W# d T
[ set label "" ]
0 x7 _0 x0 L6 L& Q- o# T* ~7 @ ]' t' S, o) C. S6 ]3 h! s% t
end
4 `/ a" s7 z1 e/ Y" ]7 xto reproduce
$ M' V- L) W% g7 K/ u6 u ask turtles [9 G! L* k$ d3 ]: k
if energy > 50 [
# j1 t4 F' V0 a set energy energy - 507 w. _# j, X% N% C& j- x; m
hatch 1 [ set energy 50 ]
3 A" ~$ l0 v; s7 a/ i, y/ j ]: ]6 K6 p/ X2 P; k. }. c
]6 T% w/ o9 Y2 P6 N! p- y
end
' U9 i8 [. q1 v3 T7 S3 R/ U" O/ Dto check-death
1 U5 I' C" G! t7 j ask turtles [
8 T; l$ f4 h2 b* \" n if energy <= 0 [ die ]
( Z5 d8 i2 A* v1 c# t) Y N ]) u7 F. T. m# ?- p' B
end: g/ ]4 P5 i. @% B
to regrow-grass
, W2 z$ H9 n+ d% u" D! y' j" V4 } l ask patches [
. H2 M/ x2 `' V1 C if random 100 < 3 [ set pcolor green ]
! l6 B2 R- w9 W g: L ]$ l/ H6 P5 C- R; M
end$ l9 s! l8 q) e
to do-plots
+ ]7 e$ ^/ {9 {0 D1 s( ~ set-current-plot "Totals"
7 k1 l& x( B. c/ \6 c* y T set-current-plot-pen "turtles"
4 r, {( \+ Y, \; F plot count turtles+ y m! R9 h( }4 ]9 \3 L
set-current-plot-pen "grass"
, j6 I" ~. s; i, K- p" Q# v, m plot count patches with [pcolor = green]
6 N- ?* q; X0 n+ E @end3 T% |) q6 V" Q/ r+ [* x
可是运行时提示no such plot: "Totals"' I: f4 A# h- H6 c S1 a
error while observer running SET-CURRENT-PLOT
7 F7 U2 z9 m' @- I called by procedure DO-PLOTS" Q( T* C: A. t0 w
called by procedure SETUP
: E& B& k K& W; x0 e l called by 按钮 'setup'
7 _" K8 L# g* \求大神解答啊 |