我编的程序如下turtles-own [energy]
) T3 M- j) J* J7 [# E% E' p+ T% `; uto setup
, |3 c- S: }2 s/ _6 u7 w clear-all
2 i$ c! a' w- D% O8 x4 f, A setup-patches* N( m0 L. Q' a& \$ R
create-turtles 100
+ _4 H/ b. ]6 U5 w2 O2 G1 Y do-plots0 L) q7 p8 m5 x4 Z; Z; u
ask turtles [ setxy random-xcor random-ycor ]" Z) \- N" [/ S2 M5 k
end' o& F2 |- Z6 i
to go
) B$ E% o) ]; f f* W0 [5 G move-turtles
& z/ }9 @$ W# s eat-grass. b: P8 r: n1 A" ^% V1 I! v
reproduce+ K- t. y* g) K
check-death
9 E+ C! Y3 O% j" v5 | g, ~ regrow-grass
/ R) |1 m! h; V" \( \% G do-plots& j% j: _+ x3 d1 D y$ H# r
end
$ y7 K; p% K5 | [9 d Eto move-turtles* r) s' }- o8 ^0 j8 g
ask turtles [
+ @" t3 ?8 D3 V2 T/ q right random 360
) U5 z4 m% q0 B/ b8 L$ M1 O- s forward 1
5 {. b3 L" g$ J7 W% V set energy energy - 1
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: v. X$ a& N! i3 {; Y% Y- Iend
, m! P. i4 |1 K9 nto setup-patches+ g* Y4 y+ {% N2 x/ x3 G
ask patches [ set pcolor green ]
, j7 E9 O( W1 C/ G4 g' B+ mend) L! A# h; q1 k, r3 ^' v
to setup-turtles
+ w" N F' r$ z1 t create-turtles 100
* g7 ?8 M+ Q/ f' z2 t ask turtles [ setxy random-xcor random-ycor ]
' V3 z2 ]3 V6 d5 I, M, Bend
9 P$ w" Q7 g3 B$ P( v2 kto eat-grass
: }2 O" {( c0 y4 [- z' N% ?9 h ask turtles [6 c( `/ c8 O/ T3 F4 f
if pcolor = green [
. u* b0 ~0 _8 Q3 I( Q1 \ set pcolor black. T- c+ w) s* O/ Z0 r
set energy (energy + 10)0 ^7 T0 H# X& y5 p
]- I3 H& z1 o) V( V; F u
ifelse show-energy?/ O2 c5 Z) j. N9 J
[ set label energy ]
& ?7 @* y! u" H3 ^: ^% \( l/ c2 J [ set label "" ]# [' @/ s8 N) S" w) H" t
]5 y; B( I9 {$ [9 \
end% j- K6 g/ }, T. B! t! U1 F4 s
to reproduce
6 q( M3 B0 N8 o: M ask turtles [
7 k8 _& }- W7 C5 N! K: d if energy > 50 [
1 ?) y1 O* i8 W8 J0 x+ M* u set energy energy - 50& X8 O# ^( n. B5 N0 ~
hatch 1 [ set energy 50 ]+ V0 }; `) g; F! _, K+ R$ j
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]
: A3 A6 `+ a% X) tend, ~; _' n- f! D: O5 t, c
to check-death
. b3 c2 A% f+ ? ask turtles [+ S% H5 W9 c. J; U
if energy <= 0 [ die ]
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end; U ~6 \( V7 T6 m. U
to regrow-grass/ }+ u2 T' ^0 E: ]
ask patches [
. H, `. k/ E) m0 b3 g: \( P if random 100 < 3 [ set pcolor green ]4 O( c1 t9 `5 A1 f8 l6 \8 ^
]' D+ ]$ K. b+ Z4 C6 S! _: a
end: y! \ s$ u" |" ^
to do-plots/ F+ H9 h C0 X) j4 u+ ]$ b
set-current-plot "Totals"3 J% ] ?+ R+ I
set-current-plot-pen "turtles"+ a$ d* w* B4 ^, P2 K- C
plot count turtles
7 R* [1 D8 u; I9 |! Z( S! D6 o9 a set-current-plot-pen "grass"
/ J0 L0 a+ A. w' w* D7 U5 _ plot count patches with [pcolor = green]8 z1 v; M) M" {4 O2 T
end7 o1 t3 w w* j6 W3 M6 |! Y
可是运行时提示no such plot: "Totals"5 S5 g" u7 f; m- ]' Z9 v" \
error while observer running SET-CURRENT-PLOT1 s7 J y$ z( X0 c2 y
called by procedure DO-PLOTS
0 i7 S8 W9 G& L$ A% J! B' n called by procedure SETUP1 c( Y' T7 `& Z' r. ]
called by 按钮 'setup'9 j; e0 X1 O9 n5 d$ w B
求大神解答啊 |