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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。
# T' c4 _/ y) b; V" e2 S9 vnetlogo自带的social science--traffic grid这一例子当中,
; v' o2 H: k0 R# vglobals: p/ N, W2 o! @
[
* H9 Y1 V1 e2 E% M  grid-x-inc               ;; the amount of patches in between two roads in the x direction" N! f* R2 t2 b& X, x) u: F% _
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
- a5 [; ~/ x3 a/ E$ v$ b" S6 k; j  acceleration             ;; the constant that controls how much a car speeds up or slows down by if* Q% ^- C: }; f( {6 Y# D
                           ;; it is to accelerate or decelerate
4 p* E/ p) i+ {  phase                    ;; keeps track of the phase
0 I, i: D# h3 W/ ^  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
/ A6 E8 U! n; z6 u# b7 i' a6 |  current-light            ;; the currently selected light8 O3 d1 W( m% u
$ ~+ L( G( N7 V) C% @
  ;; patch agentsets
: w+ y& u* z  i  intersections ;; agentset containing the patches that are intersections7 p( T, d) n$ j
  roads         ;; agentset containing the patches that are roads, o2 s, w7 [6 T4 w! v) I6 w
]9 r6 j, i: @1 a: X4 |$ z

, }3 i4 r. \6 b8 _* Aturtles-own8 U2 f; f. y( G* y; I8 y( Z
[* J- v1 Y& T" F8 }3 j3 C3 I8 M
  speed     ;; the speed of the turtle
2 A9 e- p2 p+ t& K" U  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
' L& F- x9 R1 C9 E* [, L/ M' j  wait-time ;; the amount of time since the last time a turtle has moved
/ p7 O1 j* m( H], j: Y  |  g2 d! v) {
% N+ h2 e* \2 p/ B
patches-own
1 @0 x' U/ R  n  f$ Q/ c/ l[4 P' h% H$ z; ?; p& x( S
  intersection?   ;; true if the patch is at the intersection of two roads4 q' l; u6 R' A
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false." r1 N4 o) C6 ?/ U) m2 Q% Z
                  ;; false for a non-intersection patches.5 x; a9 v! R  b2 X, j7 a( O
  my-row          ;; the row of the intersection counting from the upper left corner of the" G' V  k% l' m/ b: h
                  ;; world.  -1 for non-intersection patches.
& l- L3 D7 M5 H$ L  my-column       ;; the column of the intersection counting from the upper left corner of the
+ U6 O' \- V+ V                  ;; world.  -1 for non-intersection patches.
0 g6 ?! j, }. e5 t  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
, G7 X# |# I+ q8 F. D) j4 h1 u  auto?           ;; whether or not this intersection will switch automatically.: ]$ t( Q/ v, Q$ X
                  ;; false for non-intersection patches.
3 s1 }$ f. u4 B$ o]4 ]3 C: D. H; |% j/ k7 g6 y. y% J9 Z9 ~

* x6 v: u8 i- `# `2 z+ R1 @# t! W# D. d! N% _- R6 W+ }
;;;;;;;;;;;;;;;;;;;;;;3 p& q6 p% K9 D
;; Setup Procedures ;;
7 p! r1 f: F! w( ]$ b& O;;;;;;;;;;;;;;;;;;;;;;$ u  ]' K. X; w
6 X3 ~' h1 t7 f/ n% [) `
;; Initialize the display by giving the global and patch variables initial values.4 ~4 H& R+ c- F& C8 S8 Y
;; Create num-cars of turtles if there are enough road patches for one turtle to
, J, L* l; Z+ D: a1 i;; be created per road patch. Set up the plots.$ ~) }  X; P( d0 ?5 _2 Z
to setup3 R0 N/ e4 ^4 V+ J
  ca
$ s) N; `4 m; `  setup-globals
( x/ J5 ~) G' o; `- V6 q7 `: v: s: N
  ;; First we ask the patches to draw themselves and set up a few variables
* R' k1 A: U0 }/ z  setup-patches
) w. s6 m) [6 L& |* D8 Z4 F  make-current one-of intersections$ Z- N9 ^/ ]7 V) `
  label-current
) ~! u# [4 S2 j0 E& D. w
% K/ }) ^8 ]6 U: N0 u* U7 k  set-default-shape turtles "car"
; K/ J' Y! |- i8 I" {1 T7 F0 `
8 V+ L, d* w# w, U# R  if (num-cars > count roads)
3 [  m+ I) F. c/ H1 K' o% z  [
+ o7 x5 l( V4 m    user-message (word "There are too many cars for the amount of ", d& D- E* q4 v  A
                       "road.  Either increase the amount of roads "+ m$ ?6 L* g( X/ U
                       "by increasing the GRID-SIZE-X or "
' E' B. ^* H* w2 @                       "GRID-SIZE-Y sliders, or decrease the "! P' U( O0 C& i2 |  O4 |6 g9 W
                       "number of cars by lowering the NUMBER slider.\n"
8 T+ m" G. M, U, ]                       "The setup has stopped.")
1 u* {) C+ e, }: }) V" h0 ~    stop
: |+ o  B6 V4 p1 m* F9 |  ]
8 M' S& }: c% Y  N6 |3 @8 @5 H0 F5 U
, l* a8 ?& ]0 o* N7 U. j! C' }  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
! L; c( H- s) I, d5 a$ a/ a1 |  crt num-cars  L, g  M* r# `& V
  [
: P+ X" N; @& y. }8 l    setup-cars5 t( _. d3 b3 P
    set-car-color
. g% q' E/ @* v5 ?    record-data
5 N! s2 r& @+ s  D2 S/ `' m$ O' |6 J  ]4 D, P- j: R( |! I3 Z
' Q& O6 J7 L9 @  J/ z
  ;; give the turtles an initial speed  I* \+ C: k' g6 B% Q, v# k
  ask turtles [ set-car-speed ]
* d$ e" u, t) }3 ]; t' ]7 u% j' o3 C& d# Y% I
  reset-ticks& ]  Y9 q1 D) g1 s; T9 R
end! x% A4 z1 {# y) _7 ~

  f( k/ q' k2 V% [% W;; Initialize the global variables to appropriate values  N8 m, t8 w4 a1 J6 C1 n
to setup-globals" _: G6 W! ?8 D: T' e
  set current-light nobody ;; just for now, since there are no lights yet
9 ]' o5 I; {: G1 a& |+ c, ~  set phase 0* B( D+ w, R7 \! y% _
  set num-cars-stopped 0
; G$ B7 w9 ]4 M. a/ r, ?% L  set grid-x-inc world-width / grid-size-x, \7 w. v# ^3 A0 j
  set grid-y-inc world-height / grid-size-y8 ~/ @( _$ [7 l- g* w
% h( R* x/ u+ F3 x; H; ~0 K
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
: o7 F5 |! q) g% s4 w  set acceleration 0.099
+ P) z9 J7 \2 Q: t. M) |9 q& S9 mend) f6 k# n  o8 Z7 E) L+ K2 o
6 e! v8 X' }4 _* F7 g8 ^. U
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,4 {$ f( u$ S4 b2 w" s5 q
;; and initialize the traffic lights to one setting% A+ V5 U0 @* u- l, m
to setup-patches- _( W+ K  R  Q$ ~7 d
  ;; initialize the patch-owned variables and color the patches to a base-color
: `) @: l4 k* u  ask patches' Y5 q/ [& ]4 ^9 S( \
  [
0 r$ k, h% |+ a1 E, V    set intersection? false
# y9 W- @8 K+ e" _5 Q    set auto? false
# D$ C9 I; Q% e0 T! {! k    set green-light-up? true
( S0 j7 T7 Z& ]; F    set my-row -1; |5 \# C& P( O7 ]4 @4 V5 [0 M
    set my-column -1
& ?. ^0 T2 J9 k    set my-phase -1
$ G$ ~! x0 O  X: H, H4 r    set pcolor brown + 3- C% P4 ~# J' e
  ]1 H8 d; ~, e" k* R  l

" z* Q5 L) R% \  ;; initialize the global variables that hold patch agentsets: B9 a) j' ~4 x- ?2 }
  set roads patches with5 c2 D4 f4 C8 T! [  {* ~
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ k" R, m8 Y* C/ X$ Q, Q0 k) `0 w
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; M& D+ Z& m7 c! |  set intersections roads with
  Z3 U. c# D9 U$ X+ X6 p3 T4 z, M* `    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and+ r6 v% Y, v: x
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& L- b6 D9 |, F: c( _4 e
- V6 c0 L1 M1 }0 M' M$ |! F  ask roads [ set pcolor white ]9 Y- {: i5 S+ x* ~* n. Q
    setup-intersections
3 Y! ?3 A5 A" Y) G3 U7 [end
! b3 v; t) o7 ?% g5 V& x其中定义道路的句子,如下所示,是什么意思啊?/ h9 Z- t( i& D/ N+ w
set roads patches with9 d  W) h. P+ d3 V& |  t! \
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; A# s( m7 v. n9 K/ u    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& A7 G6 X; y! [) u: u4 j, Z8 H
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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