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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。
! i/ C( {/ ~5 J$ D* Y/ c* |netlogo自带的social science--traffic grid这一例子当中,, |* @, w: ?1 k5 |4 S) T
globals9 `- C/ V% |! ^/ ~, n" J. F% n
[
! v& F5 m1 T" ]! l! B4 Y( ?+ V  grid-x-inc               ;; the amount of patches in between two roads in the x direction
9 ~# D4 P7 b5 L! v: g  grid-y-inc               ;; the amount of patches in between two roads in the y direction& T% N+ @; i9 m$ {0 T! S
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if0 ~; h7 Z$ H& q  Z
                           ;; it is to accelerate or decelerate
, q0 F. E" H+ P2 M( B8 b  phase                    ;; keeps track of the phase
$ X) R) ]( S0 W4 c: R/ X  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
  ^7 d2 V; H1 b( _% Q  current-light            ;; the currently selected light' \+ S8 z/ x; E) X! H
0 w' U9 T& R8 h8 U: O: Q3 A+ h
  ;; patch agentsets9 j6 x) \( e' `& L, `- q
  intersections ;; agentset containing the patches that are intersections
- d! q- x9 J3 h! F* N  roads         ;; agentset containing the patches that are roads
8 U' g2 E1 w: S9 Z% S' v; x) \5 n]
/ {5 y/ ~# W" o2 N2 U
; \. j$ t$ S4 ]+ A4 J2 lturtles-own
& f, h) t$ @" ?" u7 o$ z[' H# h8 Z4 [4 p7 H
  speed     ;; the speed of the turtle2 c) P% k% r: J
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
8 B2 L4 N& w8 ?- B, [0 g; }  wait-time ;; the amount of time since the last time a turtle has moved" I" k9 x3 s) F
]
0 E2 e( `; C3 [: |0 U) |& A2 _9 o' w; Y, E
patches-own# n0 A' F5 q' O0 H, O6 Y, p4 B- w1 L
[0 |2 |0 ]2 B3 T) t* R2 f
  intersection?   ;; true if the patch is at the intersection of two roads  Z; l# E7 g* V! A. p* l, i
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
- Q! }& o- _& s: R                  ;; false for a non-intersection patches.! G0 v$ F/ w$ A/ R* C! k
  my-row          ;; the row of the intersection counting from the upper left corner of the
9 M# }+ u5 G; U- O2 j) O                  ;; world.  -1 for non-intersection patches.$ K3 U. x  \; @
  my-column       ;; the column of the intersection counting from the upper left corner of the( t! o9 y" M7 S$ ?8 o+ J
                  ;; world.  -1 for non-intersection patches.; Y2 `4 k$ l$ r" F) P1 F
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.. R$ I& C, n& ]# C: U' D
  auto?           ;; whether or not this intersection will switch automatically.
2 D' C* b. F2 R) q& i( F                  ;; false for non-intersection patches.
$ U' r% [# ?! l1 o* v]/ D" `9 A: \# {1 c7 t; m
9 z4 e+ e% p) v) _* b8 H

8 \9 N( Y& ~2 Q6 {; b& [$ F;;;;;;;;;;;;;;;;;;;;;;
. @' p( l$ {7 b" X, ?;; Setup Procedures ;;! b6 W- g" d7 J0 n3 A
;;;;;;;;;;;;;;;;;;;;;;; y) j4 ~- i  d4 C; P& X8 B
$ o( R1 V  W3 j+ i% L
;; Initialize the display by giving the global and patch variables initial values.6 F5 h* X1 N  O5 b& S  p, h! I
;; Create num-cars of turtles if there are enough road patches for one turtle to; E3 k; x9 F2 S2 c, u1 D
;; be created per road patch. Set up the plots.
9 u5 s  `2 ?  Cto setup
1 _9 v  X2 P5 c8 \. V. ?( i  ca
1 `) ?. s# f; ~3 h7 t5 H  setup-globals6 ^! V/ S! D8 T' f

. P  z" b! l# {  E# b  ;; First we ask the patches to draw themselves and set up a few variables
: l) S  ~/ M8 @- S, _4 T; e  setup-patches: x& U: h( r" x1 a# @
  make-current one-of intersections
. M5 i& o: K) R' a* ^/ I) w+ m( R  label-current
  F' Y: }4 s$ ^
5 D0 E: e. J3 I. [9 @  set-default-shape turtles "car"# |2 p; }/ P+ g+ t# h
. Z% L, u4 }# l& r" ~% U$ Y$ h- Y
  if (num-cars > count roads)2 i  a& i4 ]9 u2 r9 Z
  [: |8 _, }% U+ q, R
    user-message (word "There are too many cars for the amount of ") I' O) U0 ?: U6 R8 d
                       "road.  Either increase the amount of roads "
1 F# f- _4 v9 B  Y3 ~1 A                       "by increasing the GRID-SIZE-X or "2 h9 Q7 s& N$ G- }2 r  y: W5 C
                       "GRID-SIZE-Y sliders, or decrease the ", _1 R' d; h* Z
                       "number of cars by lowering the NUMBER slider.\n"2 g. p8 t, s. f* D
                       "The setup has stopped.")8 [; X! R2 m- k3 ^. T0 D; r
    stop
1 I" z% T4 a/ z  ]
. {- ~# y& s1 K% Z* I. w2 D
. j$ t% O- l/ V; J1 |: Y$ _  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color" Y, v4 |7 p* A2 F8 w8 q
  crt num-cars
: Y" Z5 G2 q! x& K3 @' A! U- O6 Q' g  [
, Y. j" h2 M3 B, n! N    setup-cars& p- B6 c+ a9 @1 W; g
    set-car-color
1 W. P% ?+ H' C6 }, V1 v+ H    record-data8 W8 t9 D: s+ U' k
  ]
8 k0 }& }! R. A  \" W) A. V( @* [: T; x1 g6 o
  ;; give the turtles an initial speed0 n) B0 {; W% w
  ask turtles [ set-car-speed ], O% O( K2 r( T
0 j3 {/ Q% b4 v3 K/ _
  reset-ticks
9 z$ p$ B8 ~! wend
1 b: l8 y8 D9 }% d5 k
7 D! c* B* A3 _) Z;; Initialize the global variables to appropriate values
( _' U3 f/ q2 p: b. N0 o. Cto setup-globals' P' `3 T7 m8 z. A+ E4 B
  set current-light nobody ;; just for now, since there are no lights yet9 j* [# Z2 b0 @* H
  set phase 0" i" a8 @- @  S; M0 X+ N# h) D
  set num-cars-stopped 01 L! Z9 Q7 i9 o% Y4 D7 q9 `
  set grid-x-inc world-width / grid-size-x: o) J; m3 V. m' a
  set grid-y-inc world-height / grid-size-y1 b  N1 S# K% @4 W. v

4 A( u# {1 H( Q& L  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary# R& w  [& E+ {4 a/ h" w
  set acceleration 0.099
5 h/ q# d" Q" [end, _$ T  t5 [9 [

7 i" i4 I/ b$ z6 z2 {8 A;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
! u, d6 [3 y$ q; R;; and initialize the traffic lights to one setting
, ~7 y+ C, A" M) X! F) A. ato setup-patches
* \' M8 q& M( ]* R  ;; initialize the patch-owned variables and color the patches to a base-color9 M: s% T* R4 V3 \, y
  ask patches0 f2 H+ V8 |$ s' D, Q# z
  [! T1 s0 c* o9 V4 c/ m4 N
    set intersection? false
" R  E: H% ?# a  s) l2 k    set auto? false+ N# V4 m- Y+ S# f
    set green-light-up? true( `% U* _: w4 U6 Z! [
    set my-row -1
: `4 o- R* }2 t8 j    set my-column -1
& |% f/ h, a4 E    set my-phase -1- W% z$ H+ {' i
    set pcolor brown + 3! M% I2 q5 A  B* F( \
  ]
9 @" `- w7 B" p* W( @" t. e! i1 v& b' X- q+ I6 }, S
  ;; initialize the global variables that hold patch agentsets
* \" A, N! _$ V0 {! J; T5 Q  set roads patches with! r" }+ ~7 C. A
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 y2 X7 t" P3 ?7 N0 |9 \5 o
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 w6 b0 C9 M' e- J3 A% n/ K: b7 ?  set intersections roads with1 |6 p/ p0 f+ ^% d4 _. M
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and. `, U7 s1 I. T& a" P, u* ~
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) ]) J1 T" y) l& x  y' k

2 Y* n4 G$ L, F& Z3 N  ask roads [ set pcolor white ]) m9 _- m: Y$ r/ V! T/ Y4 N; K
    setup-intersections  z8 O6 p7 M8 F4 ~+ \+ z2 a; ^& ~
end
% X1 n+ ?( B5 U* M$ m, e! ]; M其中定义道路的句子,如下所示,是什么意思啊?
; _: t, e) R6 _6 B' j set roads patches with5 \; F- ]6 O4 a9 s
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 U8 S3 z0 G- U- @# ?
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 {* |  k4 g$ ^: L' M2 \* @
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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