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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。
5 H( u( H8 e4 `- @. W/ J3 d  enetlogo自带的social science--traffic grid这一例子当中,; G2 a, g0 j" P; n# E( W2 c
globals
1 n, S- _3 e0 F) g- g/ w( w[
/ ]9 |9 N, Z* l# g$ w: x" r  grid-x-inc               ;; the amount of patches in between two roads in the x direction
+ s# [: e; F) T- Z* C  grid-y-inc               ;; the amount of patches in between two roads in the y direction' ?: }* Z9 [. U
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
% ]  C: }) S" V  b0 a# A" r                           ;; it is to accelerate or decelerate
3 @* e& |2 u: _, j5 c& o  phase                    ;; keeps track of the phase2 j* D# T. E9 {5 g$ K/ m
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure1 R9 }$ X. p; V
  current-light            ;; the currently selected light6 U# u0 }& n: c: ?1 W: W* N
6 k, G0 L; r* q# b/ h7 m- H
  ;; patch agentsets. e6 q# X6 f2 m( x- s6 e! S
  intersections ;; agentset containing the patches that are intersections
  Q' Q9 q* u( l  roads         ;; agentset containing the patches that are roads
% o! c8 {' ~7 J; U: b, y]
( u7 {+ Q. d+ f5 `1 S5 R
3 K' ]! \3 ]5 h; `6 U- wturtles-own
1 l/ E  f8 X9 a; o7 `' Z" A[% m8 ]6 h* L% u' u6 {2 l
  speed     ;; the speed of the turtle
8 p; P5 M, W; B1 E- O  ?' R& |  up-car?   ;; true if the turtle moves downwards and false if it moves to the right8 X( T# R+ ~* l7 Z% i
  wait-time ;; the amount of time since the last time a turtle has moved" |- x2 P; C, w
]4 P" s6 F3 K( t0 d2 V5 ?' K& s8 g4 ?
" w! N# m, }, E! O1 t, W& W
patches-own
2 q- \  ^: ]! C8 h$ M# Z[
" x/ U; L  Z: E$ l+ C* V/ M  intersection?   ;; true if the patch is at the intersection of two roads
4 Z6 f6 L0 m* O; _  J8 u9 L, b: _  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.% ^7 B0 U0 _, k5 X0 O. _
                  ;; false for a non-intersection patches.
2 ?7 E* N% i7 U  my-row          ;; the row of the intersection counting from the upper left corner of the
- d3 Y; `" K0 [% i8 u5 ]                  ;; world.  -1 for non-intersection patches.
3 \# G% N! z! z7 [4 f# q  my-column       ;; the column of the intersection counting from the upper left corner of the( l' P' f- Q# ]3 S+ P3 R
                  ;; world.  -1 for non-intersection patches.- j6 |) X+ B1 c/ \
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.6 p+ \) j9 d0 g6 V
  auto?           ;; whether or not this intersection will switch automatically.; q7 I: @6 |! F- O
                  ;; false for non-intersection patches.4 z' U+ h. J  H, j. B6 \
]0 [" D1 B1 h" ?# r) J, }
; @* Y' L. N/ G& z# V0 E. p

, e! Z% C  x6 k;;;;;;;;;;;;;;;;;;;;;;
7 V/ F9 \" k+ V  m2 c! K9 _;; Setup Procedures ;;
5 j4 r  |! i+ T% E! t1 c;;;;;;;;;;;;;;;;;;;;;;2 l# ]0 n( U7 U, x% k5 z6 j; }$ }2 U: h" t
# ^6 S! W: R; R& D
;; Initialize the display by giving the global and patch variables initial values.; _+ E4 l# y$ D! w
;; Create num-cars of turtles if there are enough road patches for one turtle to
: i/ g7 g/ y" R+ ~5 \, r1 A;; be created per road patch. Set up the plots.- K3 }: G% D$ {/ J  F8 d, i8 V
to setup
, r% H# y8 j9 v# M3 ^& [  ca
, N& o4 g' z  h2 U* Q& t  setup-globals% V7 s/ w- ]5 H" S9 j1 w8 U; e1 I, N

9 O: j4 Y$ I; V! _  w- t6 ~0 u+ @  ;; First we ask the patches to draw themselves and set up a few variables: b& K: z- V, t' s/ A+ e
  setup-patches6 @# V/ t. ~5 u+ m0 ^
  make-current one-of intersections3 |+ J2 j) p8 D9 i
  label-current
# B7 e0 B. @4 o
5 o# x4 k* |' w8 L5 a0 H- W  set-default-shape turtles "car"8 m$ T. p6 ^, `: r

% i& |4 l3 Y. R$ v9 [% ]! V  if (num-cars > count roads)
& c' h3 g$ j/ I0 I( x% y) ]9 B. [+ a  [5 d! j% I8 ^; |$ S
    user-message (word "There are too many cars for the amount of "% M/ U7 B& f$ i& g
                       "road.  Either increase the amount of roads "' z' z6 F: D1 m+ x# `+ s% a* i# V, Y
                       "by increasing the GRID-SIZE-X or "
$ ^2 M) v& `* }7 ^/ M                       "GRID-SIZE-Y sliders, or decrease the "8 o' w2 ~& X/ o6 d/ G! r# w
                       "number of cars by lowering the NUMBER slider.\n"( J7 S* X0 i4 Y; _
                       "The setup has stopped.")) `1 w: a% v& t0 u0 v8 K
    stop' b: i) `1 G) g+ |- M) q
  ], g6 ~1 e) A: g6 g8 n; H

! @  f/ G+ @( ^/ ?# g, v" f  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
5 I% u( l0 y* p! j  crt num-cars# O; D2 g0 E9 j* R9 G+ M* g
  [7 w7 i1 g3 B/ h6 K3 p* j: K
    setup-cars
  v4 F( s* o3 }$ c, b7 U7 g    set-car-color8 f5 ^( e* G( A1 x) ]
    record-data
  q2 ]  h) f! e8 N  ]
8 F2 b7 u5 ^" {! S* t9 P+ o- J2 ?: B
  ;; give the turtles an initial speed
( c) v3 ]6 r; e1 U1 _  R  ask turtles [ set-car-speed ]# x: _( O  w9 y$ j) l
) Y2 O( K8 @6 p$ h# }8 a
  reset-ticks7 X1 a) k( ~* n. a# ?% G
end
; V% K' p" M* |0 ~; r4 `6 P  X. z
: {: u6 C3 s7 y& Z8 w;; Initialize the global variables to appropriate values
$ ?3 _- u' L* Yto setup-globals
7 G" j! z1 D1 \) l7 X  set current-light nobody ;; just for now, since there are no lights yet) ^! o9 c, V9 l! b/ {# V
  set phase 0
! S8 b8 A0 u& a4 h- b, ^  set num-cars-stopped 0
" X5 \# K+ a( j: j8 t- D  set grid-x-inc world-width / grid-size-x
2 s1 z. z+ a) p( a  set grid-y-inc world-height / grid-size-y: V! v% M8 W) n
5 ]5 `, J2 s5 t
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
0 f8 U4 T- u2 o6 T/ r: G8 S+ W' x  set acceleration 0.099
" [/ h$ W8 S7 s6 C' @end, `2 ]/ D/ Q6 W! d
- M9 J5 d1 {% Z
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
' V, q2 a% }- J9 I;; and initialize the traffic lights to one setting  _6 H! n! l, x& C* Y
to setup-patches4 J; ~- e  X5 b6 g- c- \6 O
  ;; initialize the patch-owned variables and color the patches to a base-color% T. `# _! @8 j( ~) d
  ask patches
) y' d% N, L2 S8 W  `! B  [
8 R" O3 T& ?0 d" _5 I1 `    set intersection? false
0 T# c+ ?: v7 z1 t/ B( \6 i' i    set auto? false
9 p4 h" |* N& s" W7 C& V    set green-light-up? true  ^$ Y3 F( H3 Y7 z5 b" {
    set my-row -1/ y, k/ }  P1 A6 G1 _
    set my-column -1
# n8 N* T6 ?7 }1 }5 T# B+ P    set my-phase -1
. J. q. I/ _. Q) T7 V! z* [    set pcolor brown + 37 ~9 y0 R' |7 {) N7 }, m$ @
  ]- H+ [2 ^1 g- P1 u/ Y$ o& V1 v

3 o# y  R8 I" g' `( ~  ;; initialize the global variables that hold patch agentsets
8 Q. o' a# V( g7 V5 i9 u; L  set roads patches with& F$ ]/ Q% E6 p& q& Z" T
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ R7 |& U1 B9 b0 G) |
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 }9 v) v$ @5 s. f3 t6 j! U
  set intersections roads with
! _/ z& ]. i8 n7 o    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
: s4 D$ f5 i7 m6 ~# B; \    (floor((pycor + max-pycor) mod grid-y-inc) = 0)], c& A' f, i2 D

3 ?$ X, B$ l( p" d" @+ R4 N6 G) e  ask roads [ set pcolor white ]
/ T' y5 o( c4 N  g" h% a    setup-intersections
9 d& D' z5 t0 M4 {9 Kend
# R  x' i; P8 C. v5 X2 b4 |: A其中定义道路的句子,如下所示,是什么意思啊?. M3 @1 a$ E% M/ q1 U. y# P
set roads patches with5 H. J1 U) Y: {! D" y
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 z( F/ D- x) a. L
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ _/ i' d1 g0 x' [, q7 ^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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