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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。
4 ^8 t) j1 h( j0 O/ `, f3 rnetlogo自带的social science--traffic grid这一例子当中,# m5 }: r4 ]# J2 `/ U0 G
globals
, }1 e; \/ L3 c! G; `  Q% z[( ^  K1 t8 Y8 N( I% o7 J4 l  r& w% n& j
  grid-x-inc               ;; the amount of patches in between two roads in the x direction# N! H3 A* ?4 A$ S' Z) h
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
! A1 r; Z2 K3 H# v4 c  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
7 I. y6 a7 [6 |, H- ~                           ;; it is to accelerate or decelerate
$ N3 C  q' y: n" n* E3 r: u0 R  phase                    ;; keeps track of the phase
3 F. A+ [. m0 t" S  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure0 ?7 ]1 v! c7 B. `. N
  current-light            ;; the currently selected light* x" m  q3 v0 z, W) {

* q/ U( b) s2 ~( }6 r  `5 _* Y  ;; patch agentsets
4 Y) R$ V1 I- G7 V4 z  intersections ;; agentset containing the patches that are intersections
" q. u9 d% a8 r* z  roads         ;; agentset containing the patches that are roads
5 M, i+ t5 s) ~+ l]
, p0 u! C. _5 [1 N. i& n0 y4 l1 W+ n
5 h* J1 s7 Z% f2 A8 R/ Lturtles-own
  H7 n& C( ^5 r[: ]; V: t: v3 k# V
  speed     ;; the speed of the turtle  z8 v6 ^& \( Y! V! [
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
9 a7 W# Y% C  k7 {: h  wait-time ;; the amount of time since the last time a turtle has moved
& s& U0 f/ J* @* p9 q* F]6 E& v$ b+ J. ?" A% _
/ M, J& d$ b# A; i
patches-own0 i9 c6 ~; u/ j
[
6 f5 H6 a  I- e$ x  intersection?   ;; true if the patch is at the intersection of two roads
( g7 S& ~$ C4 T, O- ^  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.9 K6 F4 t# U9 _' l5 l
                  ;; false for a non-intersection patches.
4 `/ X- ^0 d3 w8 Q7 j  my-row          ;; the row of the intersection counting from the upper left corner of the' r: d5 `% }, T
                  ;; world.  -1 for non-intersection patches.. k8 a* Q, ^# t7 Z. A& f8 i
  my-column       ;; the column of the intersection counting from the upper left corner of the" v: ^& o4 k, c" H8 P& D# V9 U" I
                  ;; world.  -1 for non-intersection patches.( Z8 V8 M7 x1 u. m
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.2 H7 E/ r4 z7 l! o4 n+ F4 P
  auto?           ;; whether or not this intersection will switch automatically.3 k  |8 [9 }% N4 z  D' x9 h. g6 `
                  ;; false for non-intersection patches.
" O, d7 w8 i; d) u/ ?]1 t+ n* M, C' `$ E- |& t* y
3 o# y( q& z" G( \. {0 S: J

; q( j$ H4 @$ W2 f" r;;;;;;;;;;;;;;;;;;;;;;
0 R# e7 i: Q  P1 _6 n;; Setup Procedures ;;, |+ Z0 ?0 |% S
;;;;;;;;;;;;;;;;;;;;;;" d5 P- @3 ]6 o- \1 B3 t

) o* P1 A' V$ L' _. q5 x;; Initialize the display by giving the global and patch variables initial values.! I' |; t" Z& d0 A2 h  L8 Y
;; Create num-cars of turtles if there are enough road patches for one turtle to8 O6 k3 w8 J$ R/ \' \7 v- b3 F" D
;; be created per road patch. Set up the plots.% _+ z( a$ k- j5 E% s
to setup1 v* k/ Z' b, r- |  B  c  }+ u
  ca
% P1 q+ d" ^5 B4 ^$ U7 n: B3 C  setup-globals0 X1 l! J( }. P8 a+ ]  R% h" |
1 n- P6 o. m: E3 q- T! K7 [
  ;; First we ask the patches to draw themselves and set up a few variables9 S. G+ X! k& D7 `* A! _
  setup-patches
* O3 A+ K3 S* u4 y+ u  make-current one-of intersections# ^0 P- y! @, _% E& v- s/ g
  label-current
9 I- U& ~4 q' c. d, d
/ ^/ |/ O* q9 W; J  set-default-shape turtles "car"* ^! L$ {. C9 \( A5 @
3 K6 \4 l" i1 B& |
  if (num-cars > count roads)
& J' E& l7 w: i) s9 w/ k  [  v, ^: [# |3 ~( k# U
    user-message (word "There are too many cars for the amount of "
6 Q9 @2 h* M5 \3 W/ l/ |6 p                       "road.  Either increase the amount of roads "$ l0 M) t2 O; h1 a: V. P
                       "by increasing the GRID-SIZE-X or "
" F9 j" z' ?5 K1 [: u+ d% [                       "GRID-SIZE-Y sliders, or decrease the "2 ^) v  Y1 ]5 F0 W$ c
                       "number of cars by lowering the NUMBER slider.\n"
9 M( q6 [8 X. ^! I                       "The setup has stopped.")% w1 \& _9 `0 U6 l4 Z7 [$ ]) G/ Q# p
    stop
8 X* y- ^& ?0 N: A, G8 I/ I0 ]  ]. h: j5 Z1 y( R/ y
) d* c" Q8 j1 p+ |& E- B
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
1 ~0 D8 M' ~5 x# G$ r  crt num-cars
  B  o$ h5 z, I1 M, M6 |  [% S! _( n/ u" V6 M8 s
    setup-cars
* R6 b/ @- y* `7 c, B, b    set-car-color
( x0 `$ ?' W6 r4 l8 K9 `2 }5 i    record-data
% @+ D) B. K9 a9 a8 s  ]
% v( ~9 @" w" O5 h3 A; M( L
* M7 N; j+ I" }( `  ;; give the turtles an initial speed
9 _6 z: a9 t' w3 H8 N# s- F1 N, s  ask turtles [ set-car-speed ]5 Q& @1 Q4 j) i3 A

' m3 x$ E3 G5 I. c; w" ?  reset-ticks# n7 e: N" o( l  j
end
3 U9 {& V% l& c7 i4 O5 {& i
5 w' \3 E3 ]# d: Z1 o, j;; Initialize the global variables to appropriate values
  Q1 n% \; p" j* @to setup-globals" X$ @1 S3 r6 X- K1 C; c9 E1 [# N$ q/ E
  set current-light nobody ;; just for now, since there are no lights yet
) c+ r4 v. P) C. [  set phase 0
% C5 W$ Y2 t; b1 S- Y  set num-cars-stopped 0
  p2 J* V, Z1 d2 S+ d6 C' d  set grid-x-inc world-width / grid-size-x- }! h+ ~' _0 {4 W, y" Z
  set grid-y-inc world-height / grid-size-y
5 ?5 V6 Z! `8 d7 X- Q" I6 }/ M8 A# Q# n3 A3 u( }
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
$ Z1 c% K4 j- A4 ?" A  set acceleration 0.099
/ J4 N: F7 @. p* H) send
6 Q( ?$ S2 e8 }2 V
. m+ c6 o7 W5 j6 K/ q  q' C;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
' B8 \+ m' F( d- ?$ K* H& f;; and initialize the traffic lights to one setting
8 ?% ]3 v6 k$ g. |0 oto setup-patches, u% w/ r0 W& n' _# m1 m
  ;; initialize the patch-owned variables and color the patches to a base-color
9 Y) d+ A+ C9 Y' O+ z; m  ask patches2 W) c1 u$ Y+ }; Q& F" y. `4 P
  [
+ i" e" I. v; @$ p8 _6 P2 Z( E# \    set intersection? false( V0 i/ ]; {- y1 A( @5 c( C6 z5 Z* l- V
    set auto? false% A( B4 l) e- i0 ?5 a) G$ v1 ^
    set green-light-up? true: j# O; Y1 ~+ ?
    set my-row -10 m& V% ^; t$ F* ~' T% M9 P
    set my-column -1
& ~2 |+ h' V2 q$ u: ^  k    set my-phase -1: `( ?' @! Q. _' L
    set pcolor brown + 32 ]1 e+ v5 k$ T  {$ ^' o$ c, b/ y
  ]# Z- i4 j. `" L( ~! X6 s7 d6 P4 A
9 |) @, V1 G% T4 d
  ;; initialize the global variables that hold patch agentsets+ f5 N) R$ e9 ~! i# g) l, \
  set roads patches with
" l: m6 _( K% I. V( I    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" f3 y( t, n. V: \    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 w6 W/ b4 n! ^8 z+ x+ j' U9 y  set intersections roads with, C# T: `9 d" q5 r: Z7 A% i( U, ]  T1 w
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 D* b4 f" Q3 j    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 X% v! Z' x, k# f
7 ?' a6 D( \( ^  E' P
  ask roads [ set pcolor white ]
/ y2 W& B. o' H0 I* K  z    setup-intersections# T- S% C6 s/ P& R% I+ r
end( @/ M9 h( e  W$ j) _
其中定义道路的句子,如下所示,是什么意思啊?7 Z2 B" f2 |( T& R1 m! A
set roads patches with; s# M5 N# f' H& K
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
  _1 S* W6 {% V    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  M" z& P: |7 X, q7 V2 C- ]
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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