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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。
( N1 K7 \- `0 @9 K5 p# @netlogo自带的social science--traffic grid这一例子当中,  |! n; [$ W* H. _
globals
2 Z7 {' o( t# O# W[7 @/ @5 w+ _5 {; f; @- W
  grid-x-inc               ;; the amount of patches in between two roads in the x direction$ E9 V1 d- m2 |2 |8 o7 L3 r
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
  o3 }- o) h5 ?% A% t  acceleration             ;; the constant that controls how much a car speeds up or slows down by if, b* R% S. q% ?# h8 Z+ \
                           ;; it is to accelerate or decelerate
3 k* Q: L+ C7 _3 v9 r* S  phase                    ;; keeps track of the phase2 F* r+ {% E9 {& h  e' y
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure2 s# W0 e2 l+ c* _2 v" c. }8 x
  current-light            ;; the currently selected light
! z# a: w, v( x8 M; e* q0 M( p- O% Z/ g! |. W
  ;; patch agentsets5 m* P8 b! T1 z% v
  intersections ;; agentset containing the patches that are intersections
  G+ a5 W  j# a! h" \9 [% D& Y  roads         ;; agentset containing the patches that are roads; W- f" d) f0 d7 v- Z4 _4 w% s
]6 y; q' c, u, J( n4 _
8 S" M' K: b; V* i1 i. p6 O
turtles-own9 X5 e3 R1 x3 O  k& K5 H' N2 \
[' {+ J" B, g) r3 V' o' N. p9 y
  speed     ;; the speed of the turtle! r1 M" `/ J5 s, A* u$ [
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
- N3 j8 d1 x$ Z  wait-time ;; the amount of time since the last time a turtle has moved
$ [) f' ?  a% D/ i. m: [, E: C) r]
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patches-own
/ Q* Z# D( `; q% R# o, K- u[
; D1 z: ]! u. U" b' V  intersection?   ;; true if the patch is at the intersection of two roads
' U2 j& d" T, C8 i1 U  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.# f! v9 v( H- h1 Y" w
                  ;; false for a non-intersection patches.
9 ]6 D' ?0 T' D& x8 a5 f* o  my-row          ;; the row of the intersection counting from the upper left corner of the; u! k3 R2 F" a. A4 z3 w
                  ;; world.  -1 for non-intersection patches.& Q! ~. @$ }  d" z2 c. L6 K5 V0 G
  my-column       ;; the column of the intersection counting from the upper left corner of the
. T4 C/ I" h: C2 x  v8 R& r' y                  ;; world.  -1 for non-intersection patches.) z! X9 \/ @9 @5 k# C
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.' ?: {1 ^+ x2 J9 G* T3 d
  auto?           ;; whether or not this intersection will switch automatically.9 d( h/ S5 x* I, I( J
                  ;; false for non-intersection patches.
) F& R9 {/ C$ |: |& y2 h]2 O7 `8 ~& t1 S" C. a# W

' ]2 [. K$ z4 a# e9 H+ S1 L4 ?+ X& E
;;;;;;;;;;;;;;;;;;;;;;7 H# `; b! Q& M% m& U
;; Setup Procedures ;;
3 e9 m; D4 O5 e( I;;;;;;;;;;;;;;;;;;;;;;
1 ~5 D8 {- k9 f5 k/ v3 N+ F& B6 H, @9 U9 c% x  v1 d' C
;; Initialize the display by giving the global and patch variables initial values.
" d6 \$ k( C7 Z# w* a;; Create num-cars of turtles if there are enough road patches for one turtle to. C3 z3 D6 Y$ l, h3 X0 j
;; be created per road patch. Set up the plots.4 ^6 O7 W% E% ]
to setup
# i- V8 @+ F% m; F& l7 {8 o  P  ca
& \( h5 O7 Z6 s7 ?  setup-globals
+ g& x, ^5 `- Y- D3 g4 X* V; o$ }% A# J" C  P
  ;; First we ask the patches to draw themselves and set up a few variables
# n* b8 @4 V$ e8 j2 `5 C  setup-patches
' ?% N  p9 O5 {  Q0 J% w  make-current one-of intersections
( \" A, i+ K+ H: |  O  label-current: S( _& r) N' _& l/ E! L

1 y! B$ b& v0 V. ~& P- E  set-default-shape turtles "car"6 k1 [/ Z2 I( O* k

; E, R* n% l5 r. d8 Z, p+ f  if (num-cars > count roads)
# Z& t8 }6 p7 M- o! z; j5 _5 ^  ~  [; g5 |; V! w; o
    user-message (word "There are too many cars for the amount of "6 A/ d  f% J% ?* I. a3 ~% C
                       "road.  Either increase the amount of roads "  {. s4 \2 b8 r, c% k( q9 k
                       "by increasing the GRID-SIZE-X or "
) Y" N  G# B& y2 {- U4 t! |                       "GRID-SIZE-Y sliders, or decrease the "; V! X0 b, e" p1 h+ L
                       "number of cars by lowering the NUMBER slider.\n"
, ^6 p$ F/ p+ k# t1 k                       "The setup has stopped.")
$ a! U+ g- U% `    stop6 P0 J( t$ y$ {. l; E
  ]
0 [8 {7 j) s" u% r7 P7 a0 A
* D- P$ Y2 c$ F4 L5 @" J6 _& J: X  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color7 m/ R* T- f6 @# d% [- k8 \& `
  crt num-cars
0 q: N6 \% }" [; |  [9 d; i  C9 ?1 A7 g: q4 _
    setup-cars! ~0 V- l. Y# U; ~4 ]1 B* k4 r
    set-car-color; c# U4 A, m, d2 U, A) z
    record-data
. I1 k+ s+ Q+ T3 p6 _0 ^- p  ]
+ H' D) P1 ?" J% ]2 d/ n$ C  a7 B: c! N/ u; L; P8 f% V
  ;; give the turtles an initial speed
! Y- C7 T, U4 t  V: D1 w  ask turtles [ set-car-speed ]
9 A! J, v3 j  B5 {( T* U  c; X9 _+ `8 B
  reset-ticks( J6 c/ j' G& w+ J5 z: G5 F+ G
end4 w. d9 \+ m( I; {6 z' k
9 O9 T" }) W' m. p" y4 p
;; Initialize the global variables to appropriate values. x: R7 u: `1 ]$ g8 Q% X4 H
to setup-globals# s6 F6 N& x, H: }, A$ u
  set current-light nobody ;; just for now, since there are no lights yet* T% c* _( z; Z
  set phase 0
  E& H' s. k; x. l9 N* p3 A8 y  set num-cars-stopped 01 [5 k# ~! o7 e- ?5 ~  w9 u* p" Q+ {
  set grid-x-inc world-width / grid-size-x: ~& d; A% _& |, u5 q: o% h# S
  set grid-y-inc world-height / grid-size-y
$ a* l7 v5 s; b3 {/ `0 }% J; _5 ?  r
; ^  V5 r7 V5 j) C; B  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
# H; ?! S+ H: G- F1 H) q4 ?  set acceleration 0.0990 B2 N+ j: z. P7 }1 I! M3 e3 B& e. l
end+ V4 n* A* `  a2 P1 F4 c1 L4 n8 k

4 q9 c4 I/ R' Z5 e;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
6 C1 [9 m+ h( X; g/ h1 H5 J;; and initialize the traffic lights to one setting3 c7 u1 t( V2 Z+ ]1 b3 t# `, A
to setup-patches: G5 b3 H! U. W0 w3 i0 k' F3 y
  ;; initialize the patch-owned variables and color the patches to a base-color
* z) c* x' x* _- V* ~" z  ask patches
. ^" n: O& m1 h( i  [' Q; d! U4 A1 w& y( b3 P* J
    set intersection? false
1 d% u) ^! f4 s    set auto? false
# h1 @0 a) @$ A: z' [& P1 h- o    set green-light-up? true
& I7 i( _! L4 `    set my-row -1+ g- o  U9 B, ^5 O) N
    set my-column -10 E7 y+ G% e8 s7 o, p
    set my-phase -1
& }- Z2 F* ^$ T    set pcolor brown + 35 A) ?3 I( v, y' E7 G
  ]# R  v0 T5 i( o
4 f1 l' S0 ]; f" V! k* O
  ;; initialize the global variables that hold patch agentsets: Q4 u- L8 u  {8 _( d4 e
  set roads patches with
2 ~3 t- p/ h! t& T    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 w8 S) P& X. M, w6 N! ~6 J    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) s9 u+ I& J# G* e
  set intersections roads with0 g6 X2 q* T1 p; W. r3 |
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and. Q/ i8 O" P: B% e9 J- a
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. c+ o. h6 _; H$ _0 ^& [
$ }/ i: x7 ?& Q7 |  ask roads [ set pcolor white ]
  M! ], Z7 @& u$ P- g    setup-intersections
5 w1 ^1 T$ ^$ J2 B& Nend
  h% Z  o, Y; K: E1 k; F( t其中定义道路的句子,如下所示,是什么意思啊?7 E5 K: ^& j% V0 O0 O' V4 T$ H
set roads patches with' ^. @% |" @# W# ~/ y4 ]4 s
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: b! K* l9 M) {
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]% [5 \! l' k+ S$ x1 H% h8 [, |7 s
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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