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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。
0 H) s0 ~& d1 b7 A' b9 \- s% J5 Enetlogo自带的social science--traffic grid这一例子当中,
' e8 G, I. M. t/ Z4 f$ j7 c4 bglobals
, v' b# I( l0 |5 @8 M) ~[
+ m- [; f" O5 L1 [: }" n# e- C  grid-x-inc               ;; the amount of patches in between two roads in the x direction
# Y" n0 {$ O+ _) h  grid-y-inc               ;; the amount of patches in between two roads in the y direction. ^  |! v, p( N, ~, U6 n: N1 w, j
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
0 [: M" ~0 t5 J+ Q                           ;; it is to accelerate or decelerate
, H5 _' g* `6 }7 e  phase                    ;; keeps track of the phase
; m: W4 J- t& E  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
, K% B; r/ L! j% I: q6 A7 @  current-light            ;; the currently selected light
, ?2 T! ?' H+ L8 v5 T% G/ C' t' y. k# h
  ;; patch agentsets  x# P  k( c2 Z- J% l! a$ b
  intersections ;; agentset containing the patches that are intersections4 S( Q6 `3 ]  \& D2 ]
  roads         ;; agentset containing the patches that are roads7 ^3 D$ i! }5 E: y0 R' D/ L
]
, t- Q- @! @/ n3 Q" O$ l9 |
8 g" s8 ^+ C- E/ Z/ K% N7 uturtles-own
+ U& S) G- T8 O# g0 j" S[
7 ?* S) |- }3 q3 ^  s  speed     ;; the speed of the turtle
& ~: u* f* z/ e+ b" `+ G  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
  ~+ D0 B4 o5 D$ \  wait-time ;; the amount of time since the last time a turtle has moved
% {6 C5 A4 C/ e8 v1 J]5 r7 d+ ~5 o/ g9 i3 \+ ^) h5 ~# p

$ }; P4 {# K) v2 H3 l# ?# Vpatches-own% a- m, K& ^. H" D0 m2 w  O
[+ n6 u2 l4 W8 R. Y
  intersection?   ;; true if the patch is at the intersection of two roads
  z9 D% z7 S; g5 e% X- x  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
" n3 p2 a( q" z2 {# v+ v                  ;; false for a non-intersection patches.
2 q. Y" ~* T" u$ r) [  my-row          ;; the row of the intersection counting from the upper left corner of the4 Z1 E1 w5 b& n! W6 ^" {
                  ;; world.  -1 for non-intersection patches.
) t# Z- E6 u2 o0 r* A6 t6 N  my-column       ;; the column of the intersection counting from the upper left corner of the
4 o4 w& |$ T) x: L# @. B                  ;; world.  -1 for non-intersection patches.
; d% Y3 g; E/ J3 D8 e4 ?9 l  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
9 x0 s, U1 u. [# e2 `" J  auto?           ;; whether or not this intersection will switch automatically.$ e0 `6 y) o" n! c5 n
                  ;; false for non-intersection patches.& Y8 Z% Z* W/ M
]9 `/ j4 Z* C0 z

+ X8 G9 g) h* L9 G/ _( C
8 O' B0 ]/ L" S. o& M8 u;;;;;;;;;;;;;;;;;;;;;;1 |9 L5 b8 x$ X5 r( P: P1 x
;; Setup Procedures ;;$ {  i" p+ {5 f7 ?1 H0 Z6 [+ B& X
;;;;;;;;;;;;;;;;;;;;;;
0 W4 N& X) `8 w' @/ b/ U: o
2 }- d  S1 ^% r1 U" \6 ]5 S;; Initialize the display by giving the global and patch variables initial values.4 @1 {4 ?' l; D4 {
;; Create num-cars of turtles if there are enough road patches for one turtle to) f4 }7 {8 H! Y3 t9 S
;; be created per road patch. Set up the plots.
+ i  |1 r9 z# x5 w. B, G  ^3 Eto setup1 X8 X, M" D; W" A; D
  ca
: ?! U6 M3 a( V0 N0 |; }  setup-globals8 Z! D" T* p% `+ X" `+ T
* G4 n( e% y: C; Q! b( ~- b
  ;; First we ask the patches to draw themselves and set up a few variables
6 S8 G' a7 e3 Q. N0 w- a: w  setup-patches$ r* J# a4 u1 |/ M7 ]. I
  make-current one-of intersections0 I- H$ ^+ Q  m2 L! r
  label-current
8 R% b; I) N0 m) i8 a4 y0 h! H7 ~5 c5 t
  set-default-shape turtles "car"" w6 d6 K3 z- V: [4 v% e  P( L- D
6 T4 u& b" x) s: _) I) q
  if (num-cars > count roads)2 n6 P: B" o8 e4 g1 e$ X
  [/ q& u- A$ a6 N) Z4 Q0 k, f5 d
    user-message (word "There are too many cars for the amount of "
+ x, F* n$ `, T" \/ k                       "road.  Either increase the amount of roads "
6 R8 y! r* d! W1 w8 C0 ~; E% `                       "by increasing the GRID-SIZE-X or "
; U( m9 x% ]+ R                       "GRID-SIZE-Y sliders, or decrease the "
! B; L+ P% D% o6 G- F9 c                       "number of cars by lowering the NUMBER slider.\n"! ^& P  l$ F: ]* K
                       "The setup has stopped.")6 Y7 L8 a) Q, F6 f3 y% p2 R/ w
    stop
9 }  v- n2 g" q5 S  ]. K9 e% ?  v+ E$ B5 t
0 x! u& x( E2 T5 V( ]
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color' M) R7 z& I1 b% M3 Y
  crt num-cars# G% {0 G" y6 L: M
  [
" z' c$ t# h+ Y9 p/ {9 T    setup-cars7 a2 j% v  o) x* Q( \7 ^/ x
    set-car-color3 ^( _* P& Z  K  n9 N+ M5 m) `/ z
    record-data
# e5 C/ \! s9 C' h* j8 v% D  ]
2 e# I" i$ E& t! J& |
1 ~3 C( b+ [9 E2 E  q% |  ;; give the turtles an initial speed' s- \# ]/ n2 `* C: p6 }1 ]  w
  ask turtles [ set-car-speed ]' H5 {. R4 |% N
- ^8 b, u- C- C3 r* k
  reset-ticks8 w9 E% J4 W8 O) k/ Q
end
' y4 }7 b9 c8 Z% q3 L2 W: p$ r$ U' C& j9 Q- |$ d  _9 |
;; Initialize the global variables to appropriate values
3 K+ ]) q/ u! b; Gto setup-globals
6 c' s3 m5 |$ q8 Q) ~  set current-light nobody ;; just for now, since there are no lights yet
/ e" i3 s2 B7 X( i  ^; o- p. E% u3 A  set phase 0* Y9 J2 b- `0 p4 L. g
  set num-cars-stopped 0' \( E: W% |+ g( ?% f
  set grid-x-inc world-width / grid-size-x0 T4 j: b7 v' }1 o" k
  set grid-y-inc world-height / grid-size-y6 ^% y. {* ?' S4 }

4 H  v! B) u* p  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary  A' I+ T. n+ |
  set acceleration 0.099- J% U7 j8 U! k: H
end
5 l4 h1 l& U( O" Z
# T! h$ B% z' t8 {;; Make the patches have appropriate colors, set up the roads and intersections agentsets,& L( N! M4 f: G2 F: S/ j' q+ D9 y
;; and initialize the traffic lights to one setting! W5 }& ]1 K9 ~& a- e' ~) P
to setup-patches2 U  N- `& o( \
  ;; initialize the patch-owned variables and color the patches to a base-color
" m+ m( f1 ]0 r6 n8 ]) h/ J7 |% D  ask patches
1 r& |5 s, l0 ?% P6 Q  [$ B1 b- Y  z  t0 b/ v
    set intersection? false
" v. C6 ~0 @0 {3 E2 k: ~+ g4 J7 {    set auto? false+ B; ]2 v4 F" x# ?7 T; N3 I- @* A
    set green-light-up? true
2 Y: h% R2 f7 H  P    set my-row -1  y$ I6 S3 m) p1 B
    set my-column -1" f$ B9 \. X) y8 l2 S
    set my-phase -1
; C3 `/ [8 n  Q6 U. k    set pcolor brown + 33 \4 U" |4 K! A! A5 p0 P% l. X: U
  ]
; d/ b! N, R1 K7 s8 S
2 D8 i6 K4 d7 v) i  ;; initialize the global variables that hold patch agentsets
4 B$ M  y9 ]# U1 G  set roads patches with+ V" h: y* Q) t4 P, a) G! O
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 b- S- r" J  h- O- d6 H! ^
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
  s$ m  w3 S+ ~7 O6 L- e# v% v  set intersections roads with1 b( u# p( g. M. G, ?
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
; B* O: _6 e8 Q" g    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* Y4 F0 j, u% \1 q! `8 R% X8 ]5 M# p& O+ v; d4 T: [* y. i
  ask roads [ set pcolor white ]: q# j5 H4 \4 D9 r
    setup-intersections5 h, a. S5 P3 e! G" x* }' S1 h
end
/ B! G5 {4 x) y) ]; o1 K其中定义道路的句子,如下所示,是什么意思啊?
! K# a2 r& M8 l set roads patches with" ]: g, f; A, S
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# {9 z  ?0 V! e; x! o2 O. N    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; C* v' [) x6 J4 k1 W, F6 K1 G0 ~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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