我编的程序如下turtles-own [energy]
' a5 G( S6 S3 }- z5 ?4 f* Eto setup2 N9 ]6 [, F9 {, |
clear-all" L2 n$ H! |# l* g: M: d; P
setup-patches
& A9 e" J+ O, h create-turtles 1007 b) M, l: ?" \0 `+ _, x
do-plots
9 ` u' Q( t8 `- p9 l ask turtles [ setxy random-xcor random-ycor ]
1 U3 R" i5 U9 t1 \end" T' a& k8 E: _9 ?1 i3 P4 j
to go# D8 ]8 l; I' Y" w6 t1 f# _' B
move-turtles
8 G) v6 }! e, K7 V' N% Y+ B; ~ eat-grass
" A g7 w' n f0 I9 j reproduce
8 U4 Y/ m0 ^8 F& Q' ]1 w. ^/ Y$ O check-death
6 K; [+ \1 z8 @' z( F regrow-grass3 x) {2 w: H: R5 r0 e) V4 q4 V
do-plots
5 i; k4 `& D7 N) h' V9 W0 k; U$ e7 Zend
5 n, f! x3 o% ]6 G2 xto move-turtles
/ a$ t/ ^2 C8 b. W' S: i/ q3 U ask turtles [; z6 I3 g2 Q% j. N4 f
right random 360
n' W% _1 \ {: A& H$ a# z forward 1' l# e$ V: m2 }2 v* g. k* r( ~
set energy energy - 1
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end
5 @ X" m* Q9 V5 Q9 C7 gto setup-patches
+ F$ r$ x5 y# Y3 ]+ g: D8 J o. y& X ask patches [ set pcolor green ], N; y: O6 K o8 { i$ x* @
end
* \+ I# ?/ v* X# j1 `to setup-turtles
; H( c( T& `& _1 y! }5 ^ create-turtles 100" h: n* D5 y8 v3 T0 y z4 e
ask turtles [ setxy random-xcor random-ycor ]+ ?. Y! v; \5 h- h3 A1 k; B+ c
end3 ?. S3 y6 o$ \+ Q. G
to eat-grass0 n/ ]6 t- |* i( p
ask turtles [ w8 t1 V( p2 U3 e
if pcolor = green [
& |; Z- b- H7 i+ E: ?& g( Z set pcolor black) w2 L6 ~' r8 y6 f5 M" ~7 U2 D
set energy (energy + 10)1 {1 v& \. N& n7 D _ v
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ifelse show-energy?
5 K' n$ K3 }2 P [ set label energy ]
9 h5 [- j5 M" ~$ z( p, s [ set label "" ]
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end
/ T/ P1 [+ c5 @to reproduce
1 K$ k1 T: H6 p9 X- k4 e ask turtles [1 w, S8 q# G. y" z2 T r
if energy > 50 [
1 o3 p( D; p7 s3 @7 M# W6 j% ~ set energy energy - 50
5 R9 F0 w( s6 e5 |+ ~ hatch 1 [ set energy 50 ]
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], P* H/ S4 ^9 H6 [
end+ g, C+ g% q n9 Q& ^- }2 a
to check-death
8 \& M2 M, h9 v d7 c8 P7 ~" L ask turtles [
: \7 M \; |5 e" M6 v8 U& |0 C8 C if energy <= 0 [ die ]
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end4 B" U: e8 v6 {' O! W
to regrow-grass0 X, F: k- I9 M# g, Y$ t
ask patches [' B! @' U8 o P6 p
if random 100 < 3 [ set pcolor green ]
4 D2 a0 r4 K8 a$ Z+ } ]
5 U: W* n% Y7 N# c4 Iend9 [3 K3 g# M8 Q0 g0 z& T
to do-plots
* s( V1 M+ `# P0 M Z; D set-current-plot "Totals"
; Y: ^3 h# p! Z, U7 H8 G set-current-plot-pen "turtles"
- o( ]$ Y9 D5 @1 E1 ^ plot count turtles
0 l, |( C) K) U set-current-plot-pen "grass"
& b4 A( o2 {0 P8 k5 f plot count patches with [pcolor = green]
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可是运行时提示no such plot: "Totals"
, P) m6 ^3 Q7 u, _' o& n' Q( q! Serror while observer running SET-CURRENT-PLOT
/ J7 f3 u# m0 W" H+ W called by procedure DO-PLOTS" {. _8 T* R; v1 T0 D4 J/ N8 i
called by procedure SETUP1 t- i$ u5 w8 \+ X: N8 ~
called by 按钮 'setup'
( g: Y6 w( B! I5 b8 h求大神解答啊 |