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[求助] 在看例子时有几个问题看不懂

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发表于 2012-6-20 08:59:43 | 显示全部楼层 |阅读模式
新手,在看netlogo自带的例子时,有几行程序看不懂,希望高手能够指点。
' p9 D; O1 B: Nnetlogo自带的social science--traffic grid这一例子当中,
) t* d2 J2 {9 r5 }+ H8 Wglobals
& `& e0 _1 i( K/ e$ R! l[) p  V  A$ W3 D$ {
  grid-x-inc               ;; the amount of patches in between two roads in the x direction* |8 g: F5 x! l7 o$ p
  grid-y-inc               ;; the amount of patches in between two roads in the y direction! i) w" F" A' y" g
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if3 f6 z% d  C: a' w1 }- z
                           ;; it is to accelerate or decelerate
# F# P- ?# k3 j; w  phase                    ;; keeps track of the phase
3 y" W( V5 J3 C  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
6 F( m9 x% v1 P8 j3 v" |2 F5 E  current-light            ;; the currently selected light
- t% h7 I" r4 m* o2 [5 h( o  R6 @. \' s: I
  ;; patch agentsets
, m$ C2 v. S% z& @$ u  intersections ;; agentset containing the patches that are intersections1 y/ o& c& j' @+ s/ M
  roads         ;; agentset containing the patches that are roads
$ ~3 i& ~3 V3 f" F]$ H0 D  g4 K) z) }9 `. R) ~
8 \6 j( ~( i" L$ v1 {9 P
turtles-own
: r) \7 k' r1 h' V[
5 |6 i* g+ G8 m2 u) S  speed     ;; the speed of the turtle( X, _  y& M  Z
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
: t9 q. [+ N, {( a" ^1 q* K: D  wait-time ;; the amount of time since the last time a turtle has moved
$ ~: n5 q* G& @1 @3 L2 S% Z]! Q6 p/ k: W8 j; r  k4 M- t
+ G( L! p4 v& v; b
patches-own
% B+ v  n' z  Q  p7 G7 g% t[
0 l! i! ~/ D# x5 I% t1 u' y$ `  intersection?   ;; true if the patch is at the intersection of two roads
' w7 U. q6 W. E* a6 H" `  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.9 i: _( h8 ^4 P% K2 C1 l. H
                  ;; false for a non-intersection patches.6 ]1 g( Z/ ^2 _
  my-row          ;; the row of the intersection counting from the upper left corner of the3 R# u. z% E" o! ?- O
                  ;; world.  -1 for non-intersection patches.
& y# w. h, y" |  A# `: i  my-column       ;; the column of the intersection counting from the upper left corner of the/ b: g2 Z8 |$ o
                  ;; world.  -1 for non-intersection patches.
- x% f$ _% M& E0 h: K  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
4 Z2 b" g7 Z& d  auto?           ;; whether or not this intersection will switch automatically.% u  w( \' G4 {" T3 }& `
                  ;; false for non-intersection patches.
  m- X3 \7 a) I, G" @7 L2 j]; }/ K5 s* j  @8 P
" h; l6 ?5 e; J# V$ [; V

2 g6 `6 ]8 D7 P" `;;;;;;;;;;;;;;;;;;;;;;. E6 N3 {% j2 H! W' X
;; Setup Procedures ;;
0 ]) s5 Y. q1 W) H; ~;;;;;;;;;;;;;;;;;;;;;;
4 K" Z/ A/ y9 r6 p# M6 ^) {3 |( R, T* D
;; Initialize the display by giving the global and patch variables initial values., x, t! c  e/ q; w! `) g8 O* R
;; Create num-cars of turtles if there are enough road patches for one turtle to+ `6 n4 i: [) Q
;; be created per road patch. Set up the plots.
, u1 O6 B, [; Pto setup# o! \3 ]+ w2 ^9 |" B
  ca
3 n- R, U5 }9 t% `' S5 V  setup-globals
! c* h4 I/ |9 w, T6 z7 m! U% g1 q3 X0 W$ \, Y4 D
  ;; First we ask the patches to draw themselves and set up a few variables
2 [0 n- R" L6 B  setup-patches% f4 H& `9 A0 M% D9 X, r- j
  make-current one-of intersections
: k5 G! T/ {1 M* C  label-current) r6 s3 {: M! M1 m8 U5 J- P( O

0 R$ \+ W$ T4 ]9 L. K' y" k! v5 `  set-default-shape turtles "car"+ G; K- I& C1 h# h. S. P; k% Z
8 B" W# U& ^) L/ n
  if (num-cars > count roads)/ d' S' f7 O9 Y7 ?8 w% k- y
  [
. N: O5 C0 V7 m6 X7 e& k! S    user-message (word "There are too many cars for the amount of "; p, S2 G7 B2 O
                       "road.  Either increase the amount of roads "
) k4 d$ k% d, ]) C                       "by increasing the GRID-SIZE-X or "
! Q# |  x- o% M% ^+ w2 A                       "GRID-SIZE-Y sliders, or decrease the "  ]  P! r9 l& k9 |, \4 l6 v8 F
                       "number of cars by lowering the NUMBER slider.\n"; h3 e8 k3 v  S
                       "The setup has stopped.")" w( Y& U; J& S: [. u
    stop
( Q2 H; j3 ^$ F. v& V4 s  ]# {9 u3 F; b0 k
" H7 _" p' j7 M1 N8 o8 ^1 j
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
; W0 o3 L; ?4 i# m" j: J' g8 z  crt num-cars1 y6 v1 @# B0 ^
  [
( }8 u  F" L# F9 d8 s2 z    setup-cars
2 Z9 \' S5 _0 H    set-car-color
) Q* ?, X, p* n    record-data
; U: K' M, X6 @9 h* K- i( Z: \  ]' c+ Z0 D5 q2 }' ~8 O! j7 {& M

! M& k  u7 Z" h' ?; v# y3 R6 a  ;; give the turtles an initial speed
( |+ q/ \7 D" W  ask turtles [ set-car-speed ]7 s9 q! J' ]% |6 V! ^! _2 R
' d  E4 @! g+ k& u, |
  reset-ticks: \/ [9 {( x! s: L- c) \/ Z( ~  j
end  r' {+ W  w8 }, @! c; Z4 ^* T8 y
1 b6 E9 X4 b- ?0 F5 ^
;; Initialize the global variables to appropriate values
  [9 [$ v/ F3 q# p( G. Z, z. }to setup-globals! n7 }7 K) e/ [; w) O5 @9 z. n
  set current-light nobody ;; just for now, since there are no lights yet* v& p9 E  H1 T' Q# Q6 v. Y0 u' i
  set phase 0
9 R2 B- Z5 \2 ?3 c/ F  set num-cars-stopped 0: k( I( O* X. o2 p- [+ _9 g: m
  set grid-x-inc world-width / grid-size-x1 j% d* M  d, m) i# B; x- B. Z
  set grid-y-inc world-height / grid-size-y5 l4 T7 F  z" ]& R+ B$ E1 t9 A# y
) w3 }' l& _: e  Q  s  ^/ X
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
3 Z* ^( K% a% L  set acceleration 0.099
# j4 `9 W, Q; `end
5 x4 U+ ~  L; \
$ `' L" }' g8 S% N# Y! H% C;; Make the patches have appropriate colors, set up the roads and intersections agentsets,! H- Q* y" S. ~
;; and initialize the traffic lights to one setting: N& B* U' A  H8 ~
to setup-patches
4 h: p: C1 @0 i% }9 m# v  ;; initialize the patch-owned variables and color the patches to a base-color0 k/ Y# X. i4 N) m5 A8 |6 [
  ask patches6 P( G' v" G9 i; N: l
  [
: A: G2 c; r( c2 \2 \5 i! Y  V& w    set intersection? false
, ]3 l  O5 a. S  `/ Z% G- U1 S8 T" |    set auto? false
& C: r, n: Q& l1 }; A/ T0 T6 l    set green-light-up? true% w1 }, b5 b) F: D
    set my-row -1& |2 I; d1 Y1 H$ l8 B0 [7 @6 _6 b
    set my-column -15 j! T  N4 J8 H9 W9 g2 Q
    set my-phase -1( e) r  J, A; k. ]
    set pcolor brown + 3
& H: K+ G. a) h# L  ]
( g2 I% v) d7 B9 v1 @: a  Y, m0 M) ]2 a( B
  ;; initialize the global variables that hold patch agentsets% V: U1 _$ s/ n- A* p% c
  set roads patches with( G2 H" @0 X  ?! a" `; R
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! \2 w9 N, F, x, N4 |, k0 R, W    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 V; A7 o. C& B9 f8 E  set intersections roads with
  ^3 B6 u3 L$ I7 K6 l    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
6 _+ _; y3 U+ m0 P1 K7 O3 _    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 n2 c0 e( h* x# S2 q3 M
* K2 D; ?) f# a$ r. F; U
  ask roads [ set pcolor white ]
) D/ Y. V; C$ A( q5 Q7 e    setup-intersections
: x' L2 r5 p  Z/ F" n* ]; z+ J" H2 G! Send
9 a5 w, G+ ~1 ~' j* i9 o5 K0 r其中定义道路的句子,如下所示,是什么意思啊?
5 u" _0 ]% y# Y+ W+ O set roads patches with
" G" h( O2 Y3 [- _* B    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 \+ O2 p% {! W9 G, i: Y    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 c1 g& d& I6 _- q: d7 `9 p* ?5 A4 u6 r
谁能帮我解释一下[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0)是什么意思吗?
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