我编的程序如下turtles-own [energy]
9 x v$ T( H9 z, F+ `to setup0 D! u6 E1 l) {
clear-all' f# d& y( Q* `, z2 \: s
setup-patches4 G x; _' D" y+ K1 D" x r
create-turtles 100
/ R2 ?( M% P! [ d, J do-plots& @5 L: h, B1 y! ], S
ask turtles [ setxy random-xcor random-ycor ]
- `6 b1 I9 |' y8 A" o+ Z5 Gend/ ~' z! a% e" D8 T
to go! ?5 s; B/ Y* V. v
move-turtles; I" L# D4 K' l$ G0 b- _
eat-grass
, c ~4 W& o z3 m4 G reproduce: W, H( z- {! w8 Y z; B5 X1 s$ u1 W
check-death1 ]! j# F4 ]) m" W$ O) B" a
regrow-grass
' k# F0 L! u0 a! Z( S do-plots/ W; w/ g+ _. m6 P, r6 M2 \
end
, f; b3 M' [5 }2 Lto move-turtles5 M1 o' `+ n. g$ e. r6 F7 B
ask turtles [1 b/ R" h# d4 C. d
right random 360
- r n/ @' W4 z5 e. E forward 1
9 j* W% U U+ J2 i9 v set energy energy - 1
- f4 ?! u0 ?# v ]; p- M- m+ L$ p
end
5 s! p6 b$ g; d) z* ]4 fto setup-patches2 x# P4 h1 m; c. L* m
ask patches [ set pcolor green ]3 z4 b3 x2 b) b9 w: ]' K0 `
end/ p, u# r9 m8 E6 K3 ]: J$ `
to setup-turtles8 }2 B" J2 l/ `1 g# \4 d1 A: A
create-turtles 100+ Q+ s: j$ P+ W8 J
ask turtles [ setxy random-xcor random-ycor ]
% Y" b0 N5 u, nend+ U9 O/ D! q# C1 Y. ^, h
to eat-grass8 B1 h5 ?+ f' ^$ U
ask turtles [
* u p% [" J5 |1 k& [0 B1 u8 G if pcolor = green [
8 a& S# m) Q6 g2 u8 G set pcolor black8 _: P6 U, x0 t( N7 D& ^
set energy (energy + 10)
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ifelse show-energy?$ o& n6 l6 E4 n
[ set label energy ]' R0 @9 ]3 X9 m
[ set label "" ]
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end2 r) O- r3 N4 b, Z/ c0 i b
to reproduce
1 x9 F F: B2 A5 B/ l% ] ask turtles [2 B) z) {( ]. m- e# m
if energy > 50 [
; y& s* p! N; W& S, N! b2 O set energy energy - 50# n6 ]8 l1 u9 q
hatch 1 [ set energy 50 ]
7 o# [6 Q5 q$ t2 A. O ]
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end
6 B9 G9 [9 H' k# e% Mto check-death2 [0 Y( E5 l( {- k, e' E
ask turtles [: L) E$ i$ j; c+ y9 u
if energy <= 0 [ die ]
- a6 m( g& `8 H3 W ]
$ Q4 ?; k$ u/ ~$ iend
: l& s7 h$ n" Eto regrow-grass& J8 f$ g0 M" k7 l. }! p) d
ask patches [3 _! v$ T5 v/ q# o) A8 Y
if random 100 < 3 [ set pcolor green ]
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end; u% U1 N5 D- ]: ^ E d) K# q
to do-plots
8 K; ?5 B1 f4 b0 L* A1 Z3 z set-current-plot "Totals"
3 m/ D( t1 _5 T8 ` set-current-plot-pen "turtles"
8 p0 K2 U1 q5 }# f% l. U# u plot count turtles
6 {( P$ v- J. P set-current-plot-pen "grass"
' v9 m1 \( P+ |8 Y; y( }& D plot count patches with [pcolor = green]% Q0 ^: V7 e; t3 A% @5 I
end0 d) `$ Q' H. T$ I5 @
可是运行时提示no such plot: "Totals" O: _, \( n+ E8 ?: f. L% \
error while observer running SET-CURRENT-PLOT( r$ h/ J5 {+ N7 }' F
called by procedure DO-PLOTS- O9 C( `3 x% C
called by procedure SETUP
2 S: E" F( n4 j3 k5 `. k2 t6 u called by 按钮 'setup'7 `5 B$ V/ }* T. R. Q# n
求大神解答啊 |