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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。
! V/ j  b9 G' t- d& |netlogo自带的social science--traffic grid这一例子当中,7 j) i1 p1 g  U! c( M% l/ i! |
globals1 ]5 o. B; _  ~( z
[: G' m! D, r3 C4 o8 S
  grid-x-inc               ;; the amount of patches in between two roads in the x direction  f6 Y6 H: R0 G1 N1 Z8 v. S1 C
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
3 N+ {0 J8 H% S0 b  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
: b2 y: |7 H. a# U, g                           ;; it is to accelerate or decelerate
9 ]  g' |/ @/ ?3 k$ d, s" l  phase                    ;; keeps track of the phase" c( Y; T, M9 E  m% P
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
6 A( S' D2 H# n  current-light            ;; the currently selected light1 C' u$ h0 @  k

0 K: z% {" ]% }  ;; patch agentsets
. W( V0 F9 Q+ q" H  intersections ;; agentset containing the patches that are intersections
( r5 X0 Y8 U; L1 b) k  roads         ;; agentset containing the patches that are roads
7 I8 S( u4 P  [- m4 r$ J2 f! d]
! e- x6 r' _; |, {! {
& T4 |& d' q& u% v% g$ ~( _7 dturtles-own" n' F0 R: v2 j& r, R
[
# a# A/ [9 P  j0 R  speed     ;; the speed of the turtle1 W6 J( J3 G1 B0 j
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right* e- a! {/ B! p( g) `
  wait-time ;; the amount of time since the last time a turtle has moved
: I' P7 G. f3 h5 W8 s4 R]
) ^* M; [0 r# O4 G
. @2 b7 {# [/ ~; J! X1 d4 kpatches-own
2 X5 b* x1 z) z3 B# Z' @( E$ R[- K$ X7 }+ W, G1 W, k9 l
  intersection?   ;; true if the patch is at the intersection of two roads
* n# s" m- n7 M5 h* n2 I  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
0 @9 j% w/ j0 G1 J                  ;; false for a non-intersection patches.
4 t: B6 E8 N- G6 N  my-row          ;; the row of the intersection counting from the upper left corner of the
, J" T0 R& w% W* f! I                  ;; world.  -1 for non-intersection patches.
( W* J3 I. V: n6 T. Q# s! u0 T( L3 A  my-column       ;; the column of the intersection counting from the upper left corner of the
1 ~# q, l! ?" ^$ Y                  ;; world.  -1 for non-intersection patches.
! p4 B3 H  B; [# {  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.! T; B% k" {( ]' g3 t1 Y" T
  auto?           ;; whether or not this intersection will switch automatically.
: Y! N* y2 g8 T2 F" U5 ?5 E                  ;; false for non-intersection patches.
, i2 s6 o, O0 }9 a$ l/ ^]8 ~9 |( l0 {# t$ l

' G6 w8 E! n- |; \* M" w: N! P3 ?) `" a
;;;;;;;;;;;;;;;;;;;;;;
' S8 E+ ?# q3 B4 J: U;; Setup Procedures ;;
  b( Z3 E% A2 M1 @;;;;;;;;;;;;;;;;;;;;;;/ @& G6 r2 \& A( H  T8 U
+ W+ R, l, P& H7 P- Y
;; Initialize the display by giving the global and patch variables initial values.( G$ ?9 W& }4 e# }- c
;; Create num-cars of turtles if there are enough road patches for one turtle to7 E9 n6 O+ y# A
;; be created per road patch. Set up the plots.
( O7 c. F; M2 d5 ~0 L# cto setup# Q+ B; j% Z' }0 w8 J) R
  ca6 c# |4 b. \- E6 Z; E# s1 F6 f
  setup-globals
1 `* j; d$ W4 R8 i
( T6 f) D0 e$ ?4 j: F, ]/ R  ;; First we ask the patches to draw themselves and set up a few variables
- J4 \; c; \9 Z8 N6 K  setup-patches! O  Q0 L  ]  ]1 v1 l  r( w
  make-current one-of intersections. R- @( l! }2 _( |
  label-current
4 H1 n3 J( n; G+ b& k
6 D  A3 @( W% u9 n5 u  set-default-shape turtles "car"" ]8 @' {" p% x" ^+ S0 m5 F4 }) q0 S

5 R" A8 M, y- [  if (num-cars > count roads)
# t- z3 X+ b/ r6 P9 N  j  [) _( G9 j- r7 c0 L" M) c! u( O. S
    user-message (word "There are too many cars for the amount of "9 d' f" \5 m7 P) H
                       "road.  Either increase the amount of roads "! u$ `4 `2 J7 m, r
                       "by increasing the GRID-SIZE-X or "# A7 c7 q' T! C: q2 z( }
                       "GRID-SIZE-Y sliders, or decrease the "% X  [5 M! i* W; E" d& J( i9 m1 q
                       "number of cars by lowering the NUMBER slider.\n"
7 l: M; M" z$ K: k: Z/ ^                       "The setup has stopped.")- Q! G6 R  q" ]; y1 l% J
    stop
! a7 m4 ~' p: N( \# ]& Q- L0 K" ?  ]6 n; b; r) D, k. C- m. v* G
6 e! K& z2 x) m7 v8 D& C4 K4 F- X
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color0 z8 m) ?5 [! F# T+ P1 Y
  crt num-cars
/ i+ ^0 N( b: x4 r0 x  `( w  [" f1 }' r. C5 ^7 j5 Q6 G) U% g4 c9 G& B3 Y
    setup-cars
- o3 T) F: O; I" N    set-car-color( P2 L. f- }/ X9 S) E4 Q! ~
    record-data/ z6 o$ L0 m5 t
  ]1 a4 P" n! V; i
$ J+ p  @5 B: H8 W9 |% G5 M
  ;; give the turtles an initial speed% {' j* O1 I+ X+ h, v
  ask turtles [ set-car-speed ]6 V2 D+ _. @' B& }* u5 `3 q
6 j8 v, \6 N6 T, n) {
  reset-ticks
" m1 O! I# F) v1 Q9 oend& J7 ^5 N* C3 h% G3 h/ Y2 |3 W" F% u

% Z" w' l: J8 P# ?" ?;; Initialize the global variables to appropriate values
2 V& a3 _* ]2 Y( A5 bto setup-globals7 U1 T/ V" q2 P- t+ [* H& L
  set current-light nobody ;; just for now, since there are no lights yet, R8 {* P6 o- t
  set phase 05 L9 u; x! p& k0 v9 c% r$ g
  set num-cars-stopped 09 X6 H  @% J9 a
  set grid-x-inc world-width / grid-size-x
+ A( n8 J$ r. Q, G  set grid-y-inc world-height / grid-size-y9 W- r6 V7 ?0 e7 y6 E4 B+ F
8 W. K  D  G' L  y. ~4 o
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
9 G) T1 h, Z3 k  set acceleration 0.099- A4 F; O" T3 h- n4 n, H9 C7 [
end6 j! v1 {& G# D# w+ I& |
) N# w+ |( z" J: t! z
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,+ k2 O* j* m' W& o/ X
;; and initialize the traffic lights to one setting3 O4 E3 D  b2 Y
to setup-patches& K' R; h; w# E2 S2 Q& e
  ;; initialize the patch-owned variables and color the patches to a base-color
/ r8 `  _' l" m1 ?$ d  ask patches" p) O; p9 W# u
  [* Q5 t1 Z$ r3 Y9 g% Q
    set intersection? false! I( {5 E, g4 i4 F
    set auto? false
' S* ?; ?9 n6 s    set green-light-up? true; B4 Q* k$ W% f
    set my-row -15 c  h/ t8 n2 J5 k9 Z- }
    set my-column -1
/ V3 c" ~3 q$ W( B# P1 O1 ]    set my-phase -1
9 p( D! m; P2 Z; D  |8 y    set pcolor brown + 3
2 X4 R$ |  Z; l, }0 }# `6 a# R$ ^  ]$ h: Z9 \# f. x; P- r( T2 a3 S
, G, P9 k- P" a2 j
  ;; initialize the global variables that hold patch agentsets
: m7 i2 E8 C5 d  z. l  set roads patches with
) W/ R0 K' `3 H# {2 k& G: H3 G" Y    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; g' w/ S! ^6 Q7 z5 U  g5 L0 x; M! H    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& a1 x8 X& S, W" l2 \
  set intersections roads with
5 i9 v9 Z* T6 a    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, p- o! f$ k+ o: ]1 k& T
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 B5 x1 M* e  v& _4 |( d6 n$ x' q+ p
  ask roads [ set pcolor white ], `/ o! r) D' m2 c7 \2 u
    setup-intersections
" W' }) Y  v: A  j- g6 uend4 o% M. l3 b7 @& W
其中定义道路的句子,如下所示,是什么意思啊?
& W+ ~8 }4 a$ S5 k1 E5 a set roads patches with. h# _' a; O8 @( f: {1 V# k8 w
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: {3 _. P( c, E* ]1 a; p    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 s* W# l. r+ q  ?
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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