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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。
9 m9 {9 }% q5 o) U4 znetlogo自带的social science--traffic grid这一例子当中,( c. I1 S/ |: b, w$ b7 F
globals7 ?# v! q1 f0 n. e, B4 A& B
[2 k0 F+ m' p, q9 J: x! A
  grid-x-inc               ;; the amount of patches in between two roads in the x direction" q2 Z! }  Q9 i$ L. T$ \6 C
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
& ?8 o2 V: e- s2 X% Y/ d  acceleration             ;; the constant that controls how much a car speeds up or slows down by if* |2 u3 T. B! E; D/ @- `# \$ k( R  e
                           ;; it is to accelerate or decelerate+ f5 H$ u4 Q. f' D) F, Z" U
  phase                    ;; keeps track of the phase2 u1 P8 p" ~. y
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure' S* m' m- g9 n. y4 e4 A# F
  current-light            ;; the currently selected light
* T* n+ u2 a1 `+ p" R) L1 i9 S$ @) `
4 T/ d0 f* Q5 {! g5 V$ |  ;; patch agentsets
0 Q9 ~0 {  P/ V) `8 `) Y% r( r  intersections ;; agentset containing the patches that are intersections
: k6 o9 Y( ~0 {: X0 J6 h: U  roads         ;; agentset containing the patches that are roads
8 Z/ Y: n0 e2 B' C& {+ s. ~5 ~]
. b1 M4 v2 P" @! D/ H/ C
7 A; P4 g9 {5 R/ v* `7 uturtles-own
% v, k. G- q- [# ][
- C' f/ m; B" T' e; S' x  speed     ;; the speed of the turtle
' a% }0 `; }  O4 Q" B. ?9 {: b$ l  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
+ `% K- p! N1 J; V* @  wait-time ;; the amount of time since the last time a turtle has moved, F& B' H" _) D: X6 s' \* ]  G7 E
]
) e; e' \0 @  H9 p, a$ \
; \* }0 T' V% e0 Z, Q! c2 |" U. J5 [3 Mpatches-own
. A+ f5 k% H' z9 b9 w/ V[. M6 e& _, l: J( n/ e* D
  intersection?   ;; true if the patch is at the intersection of two roads
8 ^* W! h7 U' W  e8 b* O  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.1 G3 O) x; X" _% ~2 G
                  ;; false for a non-intersection patches.
: A6 t% b- i" x: F0 ~% K  my-row          ;; the row of the intersection counting from the upper left corner of the
& R9 r& }1 U' W4 x. |                  ;; world.  -1 for non-intersection patches.0 ?( _  a! Y% e0 g
  my-column       ;; the column of the intersection counting from the upper left corner of the
1 a4 }2 O0 p& P0 M                  ;; world.  -1 for non-intersection patches.7 t/ V  S/ H5 s: c0 f4 B9 F% p
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.- N, L8 I6 t: [* E, L: G
  auto?           ;; whether or not this intersection will switch automatically.
2 j" R/ H& A- R# k* R. ?% S. E                  ;; false for non-intersection patches.2 z+ f' R5 e3 z& \
]
2 @+ X9 R1 m$ T; d8 T9 f$ R
. K+ i' L0 ?+ L- {# v; w5 m& G1 d( A& t- ~4 S% F
;;;;;;;;;;;;;;;;;;;;;;
2 Z/ s, p4 [7 M8 E1 @% C$ t;; Setup Procedures ;;! B; l- S# I! }
;;;;;;;;;;;;;;;;;;;;;;
) [! J  H3 o; n2 H. C! w: g7 I6 t
7 C: u: G7 G0 @& w! D% e;; Initialize the display by giving the global and patch variables initial values.- `) C' T. f6 k7 i
;; Create num-cars of turtles if there are enough road patches for one turtle to/ M2 Q  e7 m& e6 Z/ V/ U
;; be created per road patch. Set up the plots.! C9 |# m4 G1 z% |& z
to setup
6 T+ r- G6 r) e7 C  ca
& P. X$ I% `$ M) i. J0 S/ v  setup-globals3 S4 ?4 ~+ U+ ~
" r! A' Z) o2 n; [% j' n( D, Z+ {
  ;; First we ask the patches to draw themselves and set up a few variables
3 b# b! V1 |* M  setup-patches/ Z" c. i0 s  w3 ^) x
  make-current one-of intersections
0 c8 d$ G1 j' x  label-current
/ S. T' P9 P+ `1 |5 J/ ^
5 k& f0 u3 X3 |1 n3 }, o$ {. E  set-default-shape turtles "car"1 `/ p5 g9 v4 y

8 l9 D; p1 s0 l$ S7 e  if (num-cars > count roads); V2 m; p# W: c' ~# I: @
  [
: E  c1 ?; ~8 @- ~    user-message (word "There are too many cars for the amount of "
- p/ j# q; J' d; Y3 h. W% c$ Y" z+ [                       "road.  Either increase the amount of roads "$ I4 L, ^; T9 o8 I% A
                       "by increasing the GRID-SIZE-X or "; a% m1 o6 Z/ s9 R0 n& |: [1 E
                       "GRID-SIZE-Y sliders, or decrease the "+ m$ ^0 M, Z, x$ p
                       "number of cars by lowering the NUMBER slider.\n"
! [' b: _# |) P                       "The setup has stopped.")/ Q1 _7 X9 y( q) T1 ?6 K9 E. z) k
    stop
* ?9 `1 a! E  w& {) q0 \8 Y  ]. P/ Y0 B5 R. x& U1 F- Y

3 }6 g0 N# x1 E  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
' O5 u) @! W" o1 W) J$ ?3 p  crt num-cars
' m  f. q2 t% T6 Y- A$ p  [, z) _: d8 u; R3 _
    setup-cars- l6 t9 U* b  n# ~
    set-car-color0 u: g" o3 \0 E  f  G" y! W5 v
    record-data
4 D/ t" J9 R9 Y8 u* {4 T  ]
0 D0 L( z7 ^: @  `/ f
% {4 _$ K8 [4 r$ v6 m  ;; give the turtles an initial speed
4 f6 [: o6 k6 Z3 J+ t$ ^$ \2 B  ask turtles [ set-car-speed ]: _2 D9 m2 K0 k
: t. n. P, W$ q; m5 E, A6 M
  reset-ticks) ~& B4 F# B9 U, ?( G0 x! ~
end5 O$ ^2 e% F: \2 a- C$ T& X2 J

! U2 R6 _% G1 J; d7 r;; Initialize the global variables to appropriate values' e2 j6 O; T- M! t
to setup-globals
. x) T8 v, [5 i& u  set current-light nobody ;; just for now, since there are no lights yet
7 s6 Q# i& [% U  set phase 0* v& J5 A0 U6 i: B" g
  set num-cars-stopped 0& e, p' H/ ^* q( G% ?
  set grid-x-inc world-width / grid-size-x  U. h$ M2 x0 L# ^( L$ D
  set grid-y-inc world-height / grid-size-y
5 C5 p$ C, \( q  c9 W! A- z/ I. q
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary" p* s5 s# c9 l/ [  v
  set acceleration 0.099
) F4 M! T( N8 L4 J- l0 i" Tend: x6 T" y$ g" B5 Z! V" J
+ j: `1 w8 v0 k
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
8 Y! Z5 x# W/ e" N1 P) B;; and initialize the traffic lights to one setting
* v6 Y+ m# ]: X0 e4 M  f$ vto setup-patches
5 K" U" y$ U" @5 H6 ?9 C* Q  ;; initialize the patch-owned variables and color the patches to a base-color
: s4 h) L9 I! f4 f  u* `  ask patches2 ?* y5 e$ ?2 F4 e2 I: q( F: s
  [
0 J5 `8 g$ t" B; y8 d    set intersection? false3 G, I- {& t) }0 A: X# e  }
    set auto? false
! `. b/ y, f2 M, D) d( C5 i    set green-light-up? true
" \, M* K( m, v7 ?6 |( U    set my-row -1
1 E! c2 _& `/ q2 s  `9 F    set my-column -11 r# g0 M- M7 j- X" Q0 h
    set my-phase -11 R$ U2 E( A2 e/ k
    set pcolor brown + 3( |0 u* p. b# `# q' P8 `
  ]
( p  D" S4 V: [5 E
) ]7 c+ ^9 J7 s& J' f0 n3 b  ;; initialize the global variables that hold patch agentsets$ i  D* n  M/ z) E* H1 U. ?
  set roads patches with5 p# P  g) q8 h, b6 K+ J( m' `5 W& y. g: |
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" s0 ?7 I4 ^/ f$ h
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, r+ }0 ^: e" _& @' h9 H/ r  set intersections roads with+ ~2 D, S" F. C/ \1 x4 A1 e9 e
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and" B$ M6 ?: S/ @) \- \
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* `/ T* a. S. @" u; i4 I& ~3 B/ e* W6 p! F, i6 Z  U3 _8 _
  ask roads [ set pcolor white ]
5 H5 R% ?; ^7 g9 T6 u    setup-intersections
4 L6 T. R- j$ O4 Gend
- Z0 o6 G% `! u( x# v1 T其中定义道路的句子,如下所示,是什么意思啊?
" K& p* Y1 A. Z0 J! `2 c set roads patches with1 C+ R( }8 G: r( [# I
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ G, P& s4 x# N, e  N6 B    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" N7 k2 k1 Z3 {6 g  a
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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