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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。
) y  e6 ]& |$ o" Fnetlogo自带的social science--traffic grid这一例子当中,5 n0 l3 R0 z( [' l* x1 U
globals8 i9 @8 \' ^; d8 x% K/ m' Z
[* B9 M: f. \. ?* _1 d
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
/ p4 G6 X: [9 d7 D) L2 m  grid-y-inc               ;; the amount of patches in between two roads in the y direction" r# I3 E1 |# F# g4 G/ t
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
. e* o2 x$ d8 I7 z                           ;; it is to accelerate or decelerate
1 \" y, C2 t" W+ g  ]9 F6 u  phase                    ;; keeps track of the phase/ n7 q" j1 v6 H5 A/ a4 B, {) m6 c
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure' K5 w7 f1 n. Z5 a3 k
  current-light            ;; the currently selected light
; |8 s: B. f# U  t0 P  F' K+ t4 l- o3 P/ N! k2 O
  ;; patch agentsets, J: }/ b* ^5 B8 k% m* @9 f. S( i8 f
  intersections ;; agentset containing the patches that are intersections& }* K# H5 O' N7 M) e4 N" v9 ?# w+ I
  roads         ;; agentset containing the patches that are roads
6 y+ ?- h. q" @]- H+ G% O' A( x7 l' k

) q  @1 o" U. ]) X5 F& mturtles-own
5 D& Z; }9 ?- n# i[6 y1 c0 {) |0 N8 B- @3 j
  speed     ;; the speed of the turtle
, v5 _* e* R" q( R( [  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
  n7 c2 j2 f1 ~9 e% x  wait-time ;; the amount of time since the last time a turtle has moved
! R+ C3 S% b( d& f]- L  s: X' p* k9 k( Q! \3 K
" U8 R6 ^6 }9 h" r2 p
patches-own, z: Y" u5 b* y9 C. s
[/ r" M2 k: M& n6 `; n) W& j
  intersection?   ;; true if the patch is at the intersection of two roads; m( e+ y- E" T- o9 Y) P( K
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.' j9 `5 B+ k+ m
                  ;; false for a non-intersection patches.
  \9 |" N3 i; e- g) F" n/ M  my-row          ;; the row of the intersection counting from the upper left corner of the7 H. [. f. B( W! D9 d2 e* S
                  ;; world.  -1 for non-intersection patches.) s2 ]: a. ]+ L8 S' P* N
  my-column       ;; the column of the intersection counting from the upper left corner of the
8 g. O+ K. O; k                  ;; world.  -1 for non-intersection patches.- y  \" ~' }# V+ A4 X3 O
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches." Q$ U- O2 R1 e" Q' o
  auto?           ;; whether or not this intersection will switch automatically., A" k! l( Q5 V" z2 c! z
                  ;; false for non-intersection patches.! R! H# q! L* j; D6 B" c
]
5 {6 I$ p! F: z. r, Y9 r. h
, i5 \1 A6 f+ ]4 g) s6 X+ B/ H1 X) B. |
;;;;;;;;;;;;;;;;;;;;;;
6 ?+ i# j/ w. F4 `;; Setup Procedures ;;
/ |0 z$ m( ^& S( z% d6 `- {9 }6 U* j;;;;;;;;;;;;;;;;;;;;;;4 A5 n4 B/ s+ h7 r6 O
6 w& ]9 O# r; ?) D0 L
;; Initialize the display by giving the global and patch variables initial values.3 |# m( q; p0 V7 @) t$ H; T
;; Create num-cars of turtles if there are enough road patches for one turtle to
3 w) v2 E( ?3 [$ O/ x6 c;; be created per road patch. Set up the plots.( f. q" |) c) U+ H" r( M2 [
to setup6 J7 y6 \0 P+ l# \  n9 {( F
  ca  u/ Z. T5 R( \. h9 y
  setup-globals
; x# X6 T) p& a  e5 w4 |" f$ s* F" X+ i' l9 s- \  X
  ;; First we ask the patches to draw themselves and set up a few variables
7 q8 i4 m/ C4 }! m  setup-patches
7 S$ o6 v1 z$ V* _8 N  make-current one-of intersections
  g$ A' k9 J: x" j: E& N; T  label-current
9 g! o4 Y( t% A% x# D5 ^& B; t' T
  set-default-shape turtles "car"- k( I+ o8 B5 `. u

- X; H. P9 ^. w/ P! f  if (num-cars > count roads)
$ z$ f% L5 W9 T# u6 n3 i; J  [$ V4 N4 y: C1 y8 @9 U
    user-message (word "There are too many cars for the amount of "; W$ z) l% _: p) W- M
                       "road.  Either increase the amount of roads "
2 v. v% [6 N% R) @% s/ R                       "by increasing the GRID-SIZE-X or "! A1 i4 M- `% h/ ^. j( `
                       "GRID-SIZE-Y sliders, or decrease the "4 R+ C$ S1 {; L- e
                       "number of cars by lowering the NUMBER slider.\n"
" k/ E3 I5 `. y/ l' H# P: Y3 s                       "The setup has stopped.")
0 k/ X: x5 `* E    stop
  X1 ]! S' N* [; S  ]
! C( e6 p$ o& S: j- e6 g- t2 j! f( O+ J/ l8 V+ T) ?
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ k6 {% b6 M5 ?
  crt num-cars
8 i2 q/ {! m$ O, X  [  S  t- t; }: D
    setup-cars
  R. d* F7 E% N- S# H+ p1 U    set-car-color8 h, B  l) y( l3 S9 r& G
    record-data" u, C. I; [$ |
  ]
2 Q# u& b' `+ C' T% Y& J
# b4 A* z- X. q) l' A0 n4 W7 [  ;; give the turtles an initial speed
5 V+ B' i0 R3 u+ v# V3 I3 P  ask turtles [ set-car-speed ]
5 F, @# A# Y; J* W' Y. Z+ j5 O8 _* I) ~1 e0 ?' a  i8 q
  reset-ticks
+ @, v7 K9 G+ \  B! [( Kend7 e/ c7 O% b6 ]" |
9 b  ~. y4 {1 G6 _" s' F
;; Initialize the global variables to appropriate values
+ |9 g1 N) C! q) @to setup-globals& V3 n9 a( ?7 b) ~7 F7 j
  set current-light nobody ;; just for now, since there are no lights yet
* [8 J- b6 T. U; B  set phase 08 K/ a: w4 {4 O1 P2 l  ?9 ~
  set num-cars-stopped 0( \+ v+ O! X+ g
  set grid-x-inc world-width / grid-size-x
7 _, S" D' D3 _' u5 }6 C  set grid-y-inc world-height / grid-size-y$ D. A( }# G% s! P
. f* W" \; w0 B. D& h
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
  r9 Q* ?8 V( O' f# S  set acceleration 0.099! y% G5 U7 ]# x# }1 @# X
end" e" d: I$ n4 N- p! E

! @7 B* S( v6 f  P- t; f;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
* E7 R: Y: P, x9 S  c; F+ v;; and initialize the traffic lights to one setting0 q, g2 F; I- x$ G% w% i0 ?
to setup-patches+ i" o+ M, a. I6 e8 m! R- p. U' M0 e+ D
  ;; initialize the patch-owned variables and color the patches to a base-color
! e8 d- [" f+ M+ r1 G  ask patches
, @- I; Y9 k' T  [
# X1 c: Y7 ^  A2 `( T: R    set intersection? false
5 }8 F9 x) U6 |% ?5 _0 m3 h3 E. _    set auto? false
; n, ~+ N9 H2 o4 K; p    set green-light-up? true/ k% [0 D: J# R$ s! e. X  `3 K
    set my-row -1
% k! w% c3 [) d( V    set my-column -1
  L  T, E# Q2 E$ G9 e- L    set my-phase -10 ~& b4 [* I+ t$ i- G+ ~. f: C
    set pcolor brown + 3
; X' d( Q4 i* W6 V  R% E0 J  ]
. D: Q: I2 C/ t; H8 F! X7 j' Y$ d$ {/ h+ {  r) v  z4 N
  ;; initialize the global variables that hold patch agentsets  y0 b& |* K) k. z% ^" w( ^# n
  set roads patches with; u! ~4 M. c* |' Y2 _7 t
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or  l2 X7 ?; n0 O. s+ P5 [
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# q" z" y4 s% E* A' m1 E2 q- ?  set intersections roads with. B% D7 S( i$ r3 e8 c! S7 E2 z4 j
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and0 E7 M+ I2 f' g
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& U  M/ N2 d: G2 B- a. u' h$ g" ]9 t, J7 m% h- S, ^
  ask roads [ set pcolor white ]* ^! M, ~# `7 G$ d$ z
    setup-intersections
! o0 }- L0 @+ @  J* k1 A/ yend! ?3 Z) S+ |; W+ n& J% ^
其中定义道路的句子,如下所示,是什么意思啊?8 `# C9 \# S& }& [0 P6 k. k$ ^6 n
set roads patches with
$ `! u; w5 x" c    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 y& l5 C: O, c: x* U) d) q
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; n* ^  n+ w7 Z5 u' 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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