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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。
; ]" s, v9 l+ G' N/ }8 qnetlogo自带的social science--traffic grid这一例子当中,( W# E; n7 M9 j) Q
globals. s* C0 U; t; t' \( c- v/ v
[
1 M( S' ^& `9 y" s  U6 L5 K  grid-x-inc               ;; the amount of patches in between two roads in the x direction
# p' q7 n& e8 g6 z. T  grid-y-inc               ;; the amount of patches in between two roads in the y direction0 y  w/ ^4 k1 s$ `5 i$ C# j% b
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
/ g& f" R, _  t) k7 S3 d                           ;; it is to accelerate or decelerate' _1 ?; B  F5 R( |% O
  phase                    ;; keeps track of the phase1 }, j! s/ I2 C2 T/ D' }
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
$ I. ~, J; t( b  [; @' F3 U0 t+ z8 O  current-light            ;; the currently selected light
: d! S$ @& D. D; |9 W7 b1 n# G* K) A; [
  ;; patch agentsets
' O3 J1 K- l4 h, F2 g  intersections ;; agentset containing the patches that are intersections/ }# D2 h( l' q$ i
  roads         ;; agentset containing the patches that are roads; k4 s4 K- O6 W6 k
]$ e$ W+ a5 G7 s4 h2 A
7 o  E$ c2 Y4 I  m4 S8 \6 o) c
turtles-own
7 M+ K* d3 C: \' h3 A; J[
" x0 l) F( l. k* e  speed     ;; the speed of the turtle
+ O; s7 l6 }7 G3 d* j0 ?  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
/ I) \% e( B3 T' Z; |  wait-time ;; the amount of time since the last time a turtle has moved' `1 l; F2 i- A
]
. P8 Q, `! ~5 H+ G- D2 o; M6 r( p% q( B  x  x5 ~/ T) F" c
patches-own
1 ]" D8 ?  R& M0 l9 w[4 H  T2 C, U6 K' E4 t- M8 R
  intersection?   ;; true if the patch is at the intersection of two roads" o9 ?5 j9 e4 n/ ~# X, e
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.; m2 q/ }/ z: B( {- U- T( Q
                  ;; false for a non-intersection patches.
8 R" Q; q9 `6 |$ n" s  my-row          ;; the row of the intersection counting from the upper left corner of the
2 J+ s  n# i$ v. [4 ]+ ~                  ;; world.  -1 for non-intersection patches.: A! d$ J, s  |# N2 |1 M9 q
  my-column       ;; the column of the intersection counting from the upper left corner of the
) {$ I& I+ A+ p' _                  ;; world.  -1 for non-intersection patches.6 N  f  q7 y7 f5 }+ ?) o  `
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
9 }$ `6 C9 E. Y) h; d  auto?           ;; whether or not this intersection will switch automatically.& c# P" R( v( E" ]+ o) |
                  ;; false for non-intersection patches.0 m9 p2 M! w' R4 V" m& V4 f
]$ \0 \: ]5 a" @4 W0 P; Z- `1 ~

6 O* P3 Z4 D! y$ V4 q6 f0 V- H0 h' L" I! H0 G
;;;;;;;;;;;;;;;;;;;;;;# W8 ]) o, D5 R* i, p  v
;; Setup Procedures ;;& A: s; `& f1 w) d
;;;;;;;;;;;;;;;;;;;;;;
" U& |/ l3 N' g2 q) M
! C# h5 d4 \! v;; Initialize the display by giving the global and patch variables initial values.
4 Q- k, V2 ?  U: H2 F2 |;; Create num-cars of turtles if there are enough road patches for one turtle to
+ A3 i" n% w+ `1 ^;; be created per road patch. Set up the plots.' |( H9 \$ R' J! D2 g0 t
to setup
. Z8 G, s: @6 q+ b: H0 u% R  ca
2 O; I# l/ `% P% T/ t  setup-globals
" I7 f/ d9 O+ u% V  y
9 q; G6 b3 N. V5 v7 n$ E  W  ;; First we ask the patches to draw themselves and set up a few variables
9 T! T: |1 E- b9 N7 V( F  setup-patches
$ e6 q$ d6 n  H0 h  make-current one-of intersections
% U8 m2 ^8 R5 J  label-current
) G1 r: J: L  X$ B. b0 X0 H7 j) B0 L& m9 L
  set-default-shape turtles "car"8 e; Y! B( t7 L6 \- Y4 N
' m# q  F, R# F& Y- N
  if (num-cars > count roads)
' E* J! n" N! E9 _8 r* V. x  [) n$ H% Z, [$ T' W4 h, [  y: B
    user-message (word "There are too many cars for the amount of "
$ i  B) b) b/ |8 W- H                       "road.  Either increase the amount of roads "6 F5 O/ Z3 F0 @" v9 k! `
                       "by increasing the GRID-SIZE-X or "+ J) y4 r; D- }% M- A) j
                       "GRID-SIZE-Y sliders, or decrease the "1 U6 o; V5 X) X, O9 H/ M2 r8 L
                       "number of cars by lowering the NUMBER slider.\n") I* c( V" m# E: {0 M- K
                       "The setup has stopped.")' t$ y2 \7 {$ C7 A$ @
    stop' U- C) c; B5 J4 ]9 W
  ]
$ ]1 `0 P- o* _6 U9 }  t1 I! B: d. r* H
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
8 S0 Q. n9 M! ]2 V5 e7 ?1 J5 q  crt num-cars' ^' m* d. @% n8 z2 ~; w) ^
  [
3 l9 ~/ n% J! P9 _5 B    setup-cars
1 f/ _$ B$ ?; ]: Q+ g    set-car-color
  j( S5 s- M7 O    record-data5 N3 y$ U, v7 G. Z
  ]
# J" {/ T" ?3 \
# e" n; e( z& U7 b  ;; give the turtles an initial speed
- ?8 Q! V! c  w+ E  ask turtles [ set-car-speed ]2 M! }% b1 D4 O

( s. H' R! n! ?( E- }% P" R2 S! U  reset-ticks/ _+ q( q- n6 `# P8 ]# R- V3 u+ K
end
! k  o8 b8 X) J  L& W5 J' u# T1 j# {4 c" }6 I, }
;; Initialize the global variables to appropriate values1 b- k) K2 b4 X) D; O
to setup-globals
9 n7 z$ Z9 ?+ |: r( P  set current-light nobody ;; just for now, since there are no lights yet  S0 n2 G: K& f3 e) Z, }
  set phase 0
. N7 a. G8 j! }* M  set num-cars-stopped 0% P7 y) N# S) v/ _
  set grid-x-inc world-width / grid-size-x9 G8 u& S7 {4 P  R3 e0 ?
  set grid-y-inc world-height / grid-size-y
* m& p+ y! |5 X# i( d+ A0 E8 ?; a8 @7 E. q
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
7 }9 z) {" j" ^2 z% V! l" o4 V  set acceleration 0.099
# V% a2 [( p  O' Jend: K9 N) E0 I1 X+ D* o
; _1 o2 ^, B8 n; `* Q1 u
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
* k% ^: F3 H- @! ]; W1 S0 d/ ]+ ]2 D: _;; and initialize the traffic lights to one setting9 A, p& P- v* Y* |* y0 x
to setup-patches
# a  S. h; F8 J7 D6 R+ P8 Z8 B  ;; initialize the patch-owned variables and color the patches to a base-color4 n; L) W; B5 {7 |8 F9 ]+ _
  ask patches
7 L. Q' V+ ~0 x2 v  [  P9 s6 ^# f- V( `! Q; @
    set intersection? false
/ D$ e. a9 F5 H/ ]    set auto? false0 Q' d+ |3 t0 z6 Z$ Q
    set green-light-up? true
( h0 j9 d& y! c$ r1 E- d  _    set my-row -1- R/ `$ B) w/ ~0 v  L" r
    set my-column -1
1 s: Q) `  z, v4 A9 Q    set my-phase -12 c, x+ G9 f( X+ c7 }% W' Q
    set pcolor brown + 37 w' x; I  n; V" q6 @7 [
  ]
/ }1 u" \! J# p. w* w0 C* s9 z) k( W. b
  ;; initialize the global variables that hold patch agentsets/ J: }* j& O: K
  set roads patches with4 B8 b( Z- K7 I! V( o4 r
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or  r5 U% J; N) i0 X* l# q, j! ]; d
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& m+ A" r$ r5 W- X. u  X* Y$ N
  set intersections roads with
; ]) o! M! d  }. l$ A    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
3 x2 [4 e4 W2 |    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' c* b0 R* P1 J" i& u

* `  z" n6 o, k" b! a. w  ask roads [ set pcolor white ]
1 V6 n3 E1 d. {8 }% o    setup-intersections: I, F) U0 M( B$ v) m
end
. q" e* C  l& |2 @) u* c其中定义道路的句子,如下所示,是什么意思啊?4 l/ L2 H; J. n4 G
set roads patches with
2 q6 q1 R1 p; h( ?    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 Q3 ?1 [4 @6 n7 u# }7 w
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' y: o" Y/ U; I6 J* G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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