我编的程序如下turtles-own [energy]* p X5 n+ Z0 n0 Y9 F! l
to setup: z2 d: x& c+ ]' @8 W% n6 f. _
clear-all% U- H" f- L( _/ W2 F$ l
setup-patches1 V) e" @2 w- o' S% C
create-turtles 100
. b" e/ P3 a" z do-plots/ u, G5 s$ H5 c5 K: |5 m
ask turtles [ setxy random-xcor random-ycor ]
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to go
6 f8 j7 A) ~7 r# [ move-turtles
6 n. A" ?. }6 i4 }: d3 D eat-grass# b# W4 N4 V8 O5 {4 \
reproduce! @( h. J3 F9 ~, t0 y9 J
check-death; C# K/ B& l# J, H
regrow-grass
& N3 g6 }3 n/ W; E- J/ \, I do-plots
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: y0 `6 N3 L0 t# v: ~' o" u5 kto move-turtles
% |/ M. @ N: S7 W ask turtles [
" {9 V& F1 D0 C4 y1 m/ A. {& ^ right random 360; v4 g+ {% }" z- D; s3 G/ E
forward 19 u0 B# j7 y2 X$ X* h1 r/ |
set energy energy - 1
& w6 T! d' s5 w- y+ M8 N7 j ]
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to setup-patches) E8 s6 F, W( W) T! U0 I
ask patches [ set pcolor green ]- J+ ?& q% A: G! `5 q8 ]
end" N0 L8 H/ E; x" F3 ^. G( Z
to setup-turtles, u. w3 p9 J1 k% B+ G2 G0 l
create-turtles 100$ b. j/ c& ?4 O. ] t1 ?; m' _
ask turtles [ setxy random-xcor random-ycor ]$ I/ ]* b( y% e; a( Y
end [4 } q# q+ e: ]
to eat-grass- X7 N- t. k1 K4 O
ask turtles [# b$ X# O* A2 m6 _8 ]
if pcolor = green [
. F7 m0 C" t' M9 c8 ? set pcolor black
; s! T+ T# I9 r: j- t set energy (energy + 10)) F8 B" z! Y3 H6 j: O0 A, r) D! g* b
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ifelse show-energy?
# Q' V5 r. q) e- K8 F$ q* ^$ i. r [ set label energy ]. z3 L* f3 Y, j
[ set label "" ]
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end R' f- e( W# E4 I
to reproduce
6 ?5 {) K5 m1 W0 F- X" d# G ask turtles [
9 j% }. `# `: n4 z if energy > 50 [. a1 [3 W# n, l, J: o- g
set energy energy - 503 J% y1 Y6 }2 f& c! P$ H: z. O1 k
hatch 1 [ set energy 50 ]/ b: y5 I4 |. M: x, C- r
]
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end: i) Z( e L) A; n1 c0 P9 S, k. r
to check-death9 l9 G3 ] J% t2 t4 k
ask turtles [
5 W; E S# D t& f/ t if energy <= 0 [ die ]4 ^/ P+ R% {4 Y: w( t
]. m4 ^# W9 J+ W/ I4 Y$ v
end
7 o1 H( m" U a8 r$ s* {) Jto regrow-grass
- k) [" ^4 Y8 Q3 O0 ^! Q ask patches [* u: V% q) ~0 M4 U, O; m. {$ h6 }7 U
if random 100 < 3 [ set pcolor green ]
8 t* y4 e/ q/ q3 N6 y# V ]
1 i' l5 K6 o' g2 fend1 M" E& g. \1 G% z, O
to do-plots
" ?/ ~2 x) R2 Y' a set-current-plot "Totals"
$ n' e6 p5 ^+ f K5 j' J set-current-plot-pen "turtles"% c v3 ]( X; c# C$ d, [) I; p
plot count turtles* W9 V: F; F. _, c5 O
set-current-plot-pen "grass". Z1 D2 s0 H9 N' ]! C
plot count patches with [pcolor = green], I. g( g- O' ^. p3 z+ I7 G
end
& C& q1 z2 Y1 p6 y @& }3 e, z1 J可是运行时提示no such plot: "Totals"
0 v. J, x) J1 qerror while observer running SET-CURRENT-PLOT I) A' B4 V5 H& t3 ~
called by procedure DO-PLOTS, [2 B, @2 Y0 ]: v% L3 b4 F
called by procedure SETUP5 O1 F" P+ Y/ _4 w6 e
called by 按钮 'setup') B$ ^+ T. Z, Q$ x, G0 W. d/ N# \
求大神解答啊 |