我编的程序如下turtles-own [energy]
~1 K: K! R/ I1 s$ M' Ato setup
' ^2 W: w. R+ e clear-all
; e! _$ p; }* J setup-patches3 |6 C1 G; P) g8 X( `9 Z
create-turtles 100
- l7 J( Y! V: Q" R3 N T do-plots# d* |5 o4 T W. E5 W( u
ask turtles [ setxy random-xcor random-ycor ]$ ^# y( c) a/ }0 G. H; `: D- y8 Y
end, ~8 _# V/ \! E$ T3 `! R
to go' T! u' T8 ?( D3 }
move-turtles. ~0 @) V U1 A9 l
eat-grass
1 b4 }- c% w @" X# n0 W9 d. _ reproduce
1 o" S2 O U' m% a. n: R, y! J check-death
! p5 z! a: p, o a regrow-grass
6 o4 V4 S) d" B/ P" X do-plots
% ~3 N* I( `) O, c. u$ }' nend
1 V- r. X- O- Q) F) n- rto move-turtles
P( c/ J3 g5 |8 V* n0 Q ask turtles [6 ^0 K( Z& H5 @( K/ c# X7 U" y+ g
right random 360
) U4 N+ z- N0 W* ^1 L3 n. l0 E forward 14 R7 f3 i. Y: f& C% y- B5 b
set energy energy - 1
3 J) C9 n; D3 v+ S: `2 R" H( c ]
( _6 b) U6 y% k* gend
9 [' z1 g* c) K9 R* w/ V }to setup-patches
" Q7 j1 P a6 N( ~, Q9 y ask patches [ set pcolor green ]
6 D/ I1 i5 u% y9 O( T6 zend: B, _& x/ Q2 k' ? T1 G+ h
to setup-turtles2 C/ R- }9 ?0 H- B: ]
create-turtles 100* }; ^+ w$ w( @ y" g K @
ask turtles [ setxy random-xcor random-ycor ]; o) Q+ g2 o0 e
end
& ^* Q! I9 }* D, g# g9 h, ]' U7 D8 Yto eat-grass/ M) _% K2 d# z& O6 B0 K& R& [
ask turtles [
# R2 @' z# `0 q% V% r3 A if pcolor = green [
) G l- w- @7 O- M set pcolor black
% k9 V# [: G- N4 b& c* _" q& M set energy (energy + 10)! f- J9 }4 F O& a3 ~! u+ Y
]: f& Y% k) f+ p) _0 y
ifelse show-energy?
" M$ I) b( |# H( F* d [ set label energy ]
& e8 k- y/ g `) ]+ g8 W [ set label "" ]
& ^8 H0 W/ ?: L: L, t: Z/ R# B ]1 v$ @6 K6 W, {9 V9 G
end
& L5 j7 A4 g1 ]. Mto reproduce
7 V. @' r. c! W" g/ p ask turtles [
7 Y3 F% O/ ^2 s) B5 d O9 A if energy > 50 [+ `4 x* E8 n0 R$ f! R
set energy energy - 50
8 q, ?4 z% e9 \5 E( {6 g% o hatch 1 [ set energy 50 ]
+ K4 q6 i- X1 g; @; P1 j( [ C ]/ W8 d8 T: {, W$ Z7 j- S, x9 A
]" l7 }- u; S: O
end0 r! ~( P2 S4 {) U$ n" [) T% D8 t. W
to check-death4 ^3 b1 o- X% {1 j
ask turtles [
0 j, G7 ~- c0 A' V, F- @ if energy <= 0 [ die ]* O* _1 N) X) T9 \) O
]$ M0 ?: K1 D$ x
end: q: r9 _4 K$ F$ \# R
to regrow-grass
; ]9 p( L9 l# Z6 P# A ask patches [- o; d: w) c7 T, j# g/ Z
if random 100 < 3 [ set pcolor green ]
: z! k1 Y' _8 V- O: L ]; {& q4 Z! m4 S; r/ S) `
end/ p5 e8 y0 S2 S* H' v
to do-plots
9 H4 C& h1 \! D6 s$ f; A set-current-plot "Totals"' ^6 o5 b. Y5 {( D* a) b
set-current-plot-pen "turtles"5 A6 \# {, `# u% T9 d4 c+ a- u; c
plot count turtles
$ D# Y6 ]5 M- c4 I4 t5 m( f5 w set-current-plot-pen "grass"
: s8 A' _& v& n# u( } plot count patches with [pcolor = green]: Q, s o% |! d/ C4 V. E
end I2 O8 H9 N3 n) w3 ?# D
可是运行时提示no such plot: "Totals"+ W( L$ v! t, S: @
error while observer running SET-CURRENT-PLOT" o: s7 i. i# r% `$ [) J
called by procedure DO-PLOTS& Y+ K& o7 X( ^* @$ s: Z9 J5 I+ A, w
called by procedure SETUP
3 I- y. ~' J# Q% I called by 按钮 'setup'; R- H3 t. u9 K+ a9 _# X& j
求大神解答啊 |