我编的程序如下turtles-own [energy]
% P+ u8 x& u+ Oto setup# n# |8 }& {7 o. g3 a, e
clear-all
$ E& }0 ]' v/ l S: s setup-patches
6 o! `# k# S& E8 x create-turtles 100
7 H3 L$ D" |* M' J6 B do-plots
. ~5 A& w! r- ^0 s$ h8 ~ ask turtles [ setxy random-xcor random-ycor ]1 n& g5 _0 ^7 {# J
end
: t1 `" h* ~- _to go
# n$ x3 k! o" @7 B, ?( S move-turtles+ P3 U! U, h( P$ n/ q$ f
eat-grass$ o0 Q9 l5 R/ H8 A0 `
reproduce
5 U0 y4 T' J S; d& u- q0 t4 p3 H check-death
! M- H0 ?# A' s6 |5 e regrow-grass( U* g$ ^2 h+ Q3 r+ N3 E6 A6 a
do-plots, z. ~) Z& A( x6 O) o1 W
end0 o$ g0 b6 H: L/ x: o
to move-turtles
. N0 X. S- M. k+ U ask turtles [" X O) P( @* K! B7 G- x
right random 360
- u3 n( g, S* ~7 G# e' ?9 B4 y forward 1' ~+ g$ F& v9 X0 v% Y: |
set energy energy - 1
" Y4 A- ]1 s' F% a" l ]
& X o; O4 l8 k# aend
; E3 O9 G. I4 J7 { mto setup-patches
' [. ]# z4 m! Q9 b( W ask patches [ set pcolor green ]
( i: K6 \, n+ ?9 B4 zend
2 e7 ^! N$ j4 V! H0 y. Nto setup-turtles, w* D+ g9 M* u, Q
create-turtles 100
# \" R# [; U" A* H; N7 Y8 ? ask turtles [ setxy random-xcor random-ycor ]( u/ y& h! H/ ]; D! M8 |0 V
end
9 J; {) _) g, J4 u9 x& Cto eat-grass2 {* i. h0 Y8 N5 G+ K" b5 R
ask turtles [# k0 a2 i7 x. J: ?7 E' L5 |
if pcolor = green [
# a6 f( a( r4 z, k& v$ F/ N7 O set pcolor black9 C, x* u1 V: f6 L& }& {
set energy (energy + 10)
8 Z" ?. K' W+ A: J1 a! Y ]
( y; Y1 o" Q O4 i; r' m ifelse show-energy?. Q5 u( ~9 {* t/ d+ i
[ set label energy ]# C0 O& B. d/ R* h3 @( y' z$ ^5 ~
[ set label "" ]
& o6 v8 b3 f$ k% x8 ^! W ]
; t8 Z/ _; |9 o$ u9 z0 Xend
) ^% @0 n- \! X, m0 p6 l! hto reproduce
; F; Y% U3 C+ Y1 l- N ask turtles [
5 A8 G# P' p) \& F3 ~1 m% z6 p if energy > 50 [
: I1 d. a* D8 D7 j set energy energy - 50
1 z( I9 i" }% l0 i6 w3 ] hatch 1 [ set energy 50 ]4 X8 @5 H; I; h$ {* F4 `
]
0 N, _( V: f& H' `, E ] Y0 C- V6 L' b3 b
end
! V' Q2 v# s5 j# d% U6 }5 Hto check-death
7 Q" ?; s4 |, v* g" J2 z T ask turtles [
% }) K3 R G3 A, q/ U6 Z* i if energy <= 0 [ die ]5 T9 k( Y: A% V' d W+ C+ H- b, W
]3 p4 E# D( ]' u& B
end* c1 o$ y+ \7 l0 i" Z) V
to regrow-grass6 s3 f3 f% M% g5 h2 Y
ask patches [2 g$ a* R. A: Z G4 b. W- Z
if random 100 < 3 [ set pcolor green ] y% ?& |/ d, f* g' v/ l
]
& o/ B1 A- I- B' \. jend# i8 Q {4 l# g& x& S
to do-plots
, f. y5 j, _+ q2 f) X# | set-current-plot "Totals"
% F* R" a6 ?7 ~4 `% b% g5 O set-current-plot-pen "turtles"/ e+ l. {$ F, ]6 T( z. l
plot count turtles
2 a. a, } v% O) }5 J7 z4 D' ~$ w set-current-plot-pen "grass"
. v6 o0 U) w4 @; f6 Y/ S plot count patches with [pcolor = green]0 I5 a; S2 X& l, i; s
end
6 U% R9 A0 M4 @" |可是运行时提示no such plot: "Totals"
+ j( j$ P# T lerror while observer running SET-CURRENT-PLOT
; d! o. Z) |6 ]: `" C called by procedure DO-PLOTS
" g1 ]4 q5 |" w% o8 D& S called by procedure SETUP/ X2 R- H4 f6 ~9 ^3 U6 q
called by 按钮 'setup'/ l& z) H. s3 J: R) t' g' Z
求大神解答啊 |