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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。
. R9 }# X, a+ `6 j6 @netlogo自带的social science--traffic grid这一例子当中,2 [3 O; {- o* A+ L3 `/ M, a
globals2 J' o5 \% \# t+ b6 V
[! x4 f% Z6 o- k3 h, F2 |) U
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
" F. X  ~3 p$ o& r0 b4 s+ u  grid-y-inc               ;; the amount of patches in between two roads in the y direction
" j- s4 W9 }: ?  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
- k; @  H6 m0 I) _# k1 e                           ;; it is to accelerate or decelerate3 b6 v, \# w3 f2 U- G
  phase                    ;; keeps track of the phase
& e! y9 H, z* s# a, i4 Z4 Y  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
( A( k- |( H, s! u# g. @+ S  current-light            ;; the currently selected light+ `; @9 |# I) O1 x
9 ?5 g- E. f( c5 M! a
  ;; patch agentsets+ C) }0 M$ f  l* o+ s
  intersections ;; agentset containing the patches that are intersections" G1 f: C# O# F) o+ k( T
  roads         ;; agentset containing the patches that are roads
; Y. ^7 p! z% B. q. B1 o( k]6 \5 t: P( B* K9 k

$ ]# w! A% m4 L9 j/ p/ `turtles-own
# m3 D9 v( a6 B[
8 X; V9 c" P. r5 O5 s# H1 j  speed     ;; the speed of the turtle
: g  v5 g. C* {/ Q9 H. W2 A5 A  up-car?   ;; true if the turtle moves downwards and false if it moves to the right) G) g! e6 |  W: l: a$ a3 x+ t
  wait-time ;; the amount of time since the last time a turtle has moved1 s7 I2 ]+ P7 @4 j, s: W. s
]
8 E6 Y* v1 o& I- Z' t  W* I9 j
patches-own7 l& y4 H3 f% r0 i! d) U
[0 k6 u8 l* V9 H  ~& Y
  intersection?   ;; true if the patch is at the intersection of two roads3 @: |5 q. W% g1 S  M: c
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
0 Q6 l9 h! Z6 Q' u, ~, F                  ;; false for a non-intersection patches.$ m4 L, E% c; h" H. ~) h; r
  my-row          ;; the row of the intersection counting from the upper left corner of the3 ?6 d* e. ~5 m2 i
                  ;; world.  -1 for non-intersection patches.
9 o4 e/ N3 @8 o4 U, \+ L  my-column       ;; the column of the intersection counting from the upper left corner of the
6 _, E2 r  T- @) G                  ;; world.  -1 for non-intersection patches.) H. T3 T! @8 g: X1 @
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.( S' ~: N+ R( ^0 a1 P# S+ q  g: z
  auto?           ;; whether or not this intersection will switch automatically.
0 _& {: e- [- D: t9 H) D: i                  ;; false for non-intersection patches.5 `# g6 y; h; c
]# S' Y4 d% E/ Y% ]6 {
# b; D* w2 V2 o

# d- Q. D# p) w0 ?! P9 |;;;;;;;;;;;;;;;;;;;;;;; F: e3 x: ^) E) E
;; Setup Procedures ;;! y* T& e$ U* M5 w1 Q" u
;;;;;;;;;;;;;;;;;;;;;;  Z; o3 m2 B9 K, d3 V
* }! n2 U2 ?" B4 w) I2 F
;; Initialize the display by giving the global and patch variables initial values.
5 S6 I& g* N" U, y;; Create num-cars of turtles if there are enough road patches for one turtle to
( b3 B4 M  a8 A3 K0 O;; be created per road patch. Set up the plots.
" a. F% m7 I! x+ g' w# p& Y; [to setup
3 d' c1 t) `- D) y# ~  ca' Q. J  M) p" y  j7 g. Q
  setup-globals
: Y* {/ i, d% ~8 F
8 S; A( @  f, K. F- z4 K  ;; First we ask the patches to draw themselves and set up a few variables3 F9 G: @: s; M; E6 S6 s1 f
  setup-patches1 C/ {& \$ K( z& [" W+ z
  make-current one-of intersections7 O' I3 e3 X: C; v: i& z  T
  label-current1 A5 k6 E9 [/ O3 ~* v, q# h
# v5 _% G; F- c
  set-default-shape turtles "car"# Y9 v+ ~* @$ s" u
! p2 ~9 c! v) I* r
  if (num-cars > count roads)4 [; S* x: N" u3 [5 U
  [
2 Z- X& U+ \4 m8 }8 m9 O4 W: a7 k    user-message (word "There are too many cars for the amount of "
4 [% c" O2 T  a! H% Q# T2 ^: ]  {5 Q                       "road.  Either increase the amount of roads "
8 q9 o$ D7 J/ s" \( A                       "by increasing the GRID-SIZE-X or "5 z7 ^( F  _- L4 o1 z( {& h1 t
                       "GRID-SIZE-Y sliders, or decrease the "
. w) r' n( c' Z2 u4 b                       "number of cars by lowering the NUMBER slider.\n"6 l6 e5 N2 {3 B! Z3 }4 ~4 G
                       "The setup has stopped.")/ H' L) y' N$ L0 k. I5 d
    stop: z. p/ ]; T- g
  ]
' k# y" l4 ]# W' Y( t0 E# C3 w, F' {" Q0 v2 k) r( I8 z3 P& c
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
, s0 N# P6 l# g  crt num-cars
4 v3 e! H% [, O* d; Z  [
, ~4 i9 ~8 L; y  L# |    setup-cars' y/ I% i* c. q5 U
    set-car-color/ V# G! a( E# t2 v4 |% ?
    record-data( I% ]& V. k, u# z# X
  ]- e8 u. t8 {$ G1 z* E
7 m; I9 k! O; f7 G+ ^8 B
  ;; give the turtles an initial speed
! T9 m( U' T% b  ask turtles [ set-car-speed ]( c3 l6 d; L+ S1 ^
. j7 Z: A/ E0 I# v  z
  reset-ticks' ?8 S9 C, c, [, q3 S: t& Z  [
end
5 i/ ~$ [5 A6 h
/ i! N$ x9 i. q;; Initialize the global variables to appropriate values
7 ^5 S* F8 \; Y1 F4 @to setup-globals
7 q/ \8 j# _( E+ L- @  set current-light nobody ;; just for now, since there are no lights yet
: h: |5 p6 I+ |  c* A7 N2 ^" v0 N  set phase 0
. c$ F$ m, E- ^" F. ]$ X  set num-cars-stopped 0
$ p1 f& l$ c3 {2 |* _* Y8 X- B  set grid-x-inc world-width / grid-size-x
2 K. M: A: u% a7 u( X/ Z  set grid-y-inc world-height / grid-size-y
1 R  e" L, O8 }( ]+ u& C
% V3 Q  z. {1 F8 Q4 w- X. E, P  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
; W' e: P5 G, Z/ W  set acceleration 0.099, E9 C' f! Q$ N" `
end
) g6 m& z# D$ i9 F+ ^2 Z% b7 d; X- w0 X; c1 J
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
3 L" w0 n& ?+ J;; and initialize the traffic lights to one setting
1 _1 ?$ e) K; c7 ito setup-patches
; ?, b4 U: o9 U6 U  M7 W  ;; initialize the patch-owned variables and color the patches to a base-color4 l' i# r- P. K
  ask patches! l6 y/ W% v* `  D* p2 g8 H
  [
) f8 t5 S0 Q+ W, e- s3 N    set intersection? false+ }3 F2 k6 r+ b2 ~0 x2 p* B9 ?
    set auto? false# T6 `4 s% X3 {) M5 \/ A2 R
    set green-light-up? true. R# _% [2 W: d1 A
    set my-row -1
' W3 S$ x9 Y4 x3 B8 }9 z+ ?    set my-column -1% O3 G* i+ ]9 f. X
    set my-phase -18 I9 s0 [7 F  h0 q7 B1 E2 `. }! v$ x
    set pcolor brown + 3
+ }, h! a/ G' [) p9 Z  ]& U9 T7 x+ Z9 G2 A9 j- z0 n
5 w0 Y/ D' D& `4 i' J
  ;; initialize the global variables that hold patch agentsets9 v" B$ e* N$ O7 \) \# b  U% _
  set roads patches with7 V( W8 W9 l2 p& |& ~3 D" ~
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; u  ?' u3 {: ^6 h    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]% f7 k/ }8 Q8 s, ~. S0 i
  set intersections roads with& X9 n# U" {% p% i
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
, \5 x. n" A5 Q! o( c: h& ]    (floor((pycor + max-pycor) mod grid-y-inc) = 0)], a0 o1 O* D  I* i4 l) A6 U2 c
  }5 \. [  T% p
  ask roads [ set pcolor white ]  f, s: Q" r2 l: f* A0 e
    setup-intersections
. f( M6 a+ b+ B9 `end
9 Q5 n; y5 k* I; X+ Z$ _其中定义道路的句子,如下所示,是什么意思啊?
  r' @4 I! }( _2 T! }" ]3 U set roads patches with9 `! A+ F2 C& q0 z( _
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 c. D/ p+ C! f9 f    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- f$ |& m- Y6 W7 Q( D' ^) ^4 ?& v
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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