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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。
! y' \7 H$ k. h: E; hnetlogo自带的social science--traffic grid这一例子当中,* k! _0 t3 D$ y5 R
globals  m% k6 I& [# w  M" J
[7 Q' p* }, ^) Z+ o, @( |  G
  grid-x-inc               ;; the amount of patches in between two roads in the x direction; t, j  L2 L& h; W* R* q
  grid-y-inc               ;; the amount of patches in between two roads in the y direction0 O% i8 @1 m+ i" M  c: \
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if% H2 C! ~- p& u. d2 {; E
                           ;; it is to accelerate or decelerate0 S& }$ d( ~  T' _' T
  phase                    ;; keeps track of the phase
6 U! O  r7 U( i& o" W9 Z4 c1 J5 r1 u( g  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure3 I0 m0 J* j$ V6 X5 Z) I- C! Y
  current-light            ;; the currently selected light
/ G# a% X& ~4 k
  x( d: G% i, L  ;; patch agentsets+ d5 j& w4 q1 a
  intersections ;; agentset containing the patches that are intersections
# Y7 g% A+ L# i: U" [5 }- G" t* |6 \  roads         ;; agentset containing the patches that are roads( g% |8 ^1 C& r' n: k0 T# H
]
$ B# N- A! \" }' z: k" i* o9 \0 M6 x
turtles-own4 Q& U7 c2 B8 D4 q  V3 }& Z
[# e$ A; A6 y+ k, c
  speed     ;; the speed of the turtle
5 u! l/ O+ l- f* U2 F4 A& }  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
2 P+ F$ j" s" V% S5 c  wait-time ;; the amount of time since the last time a turtle has moved
5 x& A5 {5 B& P]
& X4 c# s  B. y! N: N: \( t  C$ F/ d
patches-own$ ]5 _8 g; u( ?: E: o/ r
[9 J1 t- b6 c9 B1 v5 w
  intersection?   ;; true if the patch is at the intersection of two roads
6 t- \; I+ s& |5 }3 A  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
  @4 {: D/ |1 v! D% D                  ;; false for a non-intersection patches.8 w; R; h+ {& l8 {  M
  my-row          ;; the row of the intersection counting from the upper left corner of the
$ {# G3 J% c6 |                  ;; world.  -1 for non-intersection patches.
5 p9 c+ h$ G' }- |  my-column       ;; the column of the intersection counting from the upper left corner of the
3 t- L, G5 J9 P& w% C                  ;; world.  -1 for non-intersection patches.
* k0 s$ @( W" m0 {# a# k* F. l# z9 |  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
/ i1 z' U6 L8 l. E+ C  auto?           ;; whether or not this intersection will switch automatically.
8 x, Z3 M1 N& k9 D4 H                  ;; false for non-intersection patches.9 i* L* {- V5 X) {; i$ v; l
]9 H( U' O" f2 G* @+ b) |/ o" D
  s# h8 P/ e& {7 C5 r! k

/ h- V, `6 o/ @7 {" R& \) [;;;;;;;;;;;;;;;;;;;;;;( r1 u& G" B( Z0 s7 }* c- W* j
;; Setup Procedures ;;7 D- u& p3 Y; e! w, Y- ^  D" j
;;;;;;;;;;;;;;;;;;;;;;9 F2 F# [. n5 O$ p& E
2 a/ N' e. V& m+ h
;; Initialize the display by giving the global and patch variables initial values.+ [- H5 F$ t2 C6 g, y( l- R6 f& L
;; Create num-cars of turtles if there are enough road patches for one turtle to
% m# v; a& h0 N5 B# B7 j;; be created per road patch. Set up the plots.7 I' D: H6 l! }" q8 s6 ^% ]
to setup
+ \9 P( t/ z2 ]. F! Q- _9 M  ca
  x0 X2 ]/ p2 |4 l" V1 f; A3 s8 {  setup-globals1 k# p0 J' A6 r% `7 C& x
+ d( ^8 Y- |. R
  ;; First we ask the patches to draw themselves and set up a few variables
  r1 X* q+ Z4 A  setup-patches( P( A8 J+ w0 M1 E
  make-current one-of intersections7 t. f% ^5 i4 h$ N2 Y" r
  label-current+ n8 g- O+ N8 |

2 \: S" ^( u$ s) f  set-default-shape turtles "car") O1 z( S6 C- O' o/ |4 R- P
# g* B- L8 j$ \7 K4 S) `6 ?  O
  if (num-cars > count roads)
' i/ a* c" `0 Y* E  [, C: [  n: `6 S
    user-message (word "There are too many cars for the amount of "  `8 o( j8 R, w9 L0 x
                       "road.  Either increase the amount of roads "
# {1 P# i2 `/ M7 U" ^! a$ r9 f                       "by increasing the GRID-SIZE-X or "9 i, a: R2 q3 P5 q* h* w
                       "GRID-SIZE-Y sliders, or decrease the "
, R3 K5 C( F$ Q/ w, q& P# {3 h                       "number of cars by lowering the NUMBER slider.\n"
1 Y& J: c/ x9 u' o: i0 a; X                       "The setup has stopped.")
. o! z, Z. a0 s& F; E" I( r/ T/ l    stop. U+ b$ }7 ]4 g  O5 [- o+ Y2 V
  ]$ L$ s9 j8 x+ N

2 W0 f: f0 w" V# G. K* p* U* t1 c7 y- ?  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
4 c6 k  l& _4 @6 ]* ?8 V/ l  crt num-cars+ O/ E/ B9 H6 ]% k
  [
: x+ H8 p) l6 K8 b: Y% d1 b    setup-cars7 ]6 @% V8 g9 A. x! J8 F/ Q& c
    set-car-color2 p8 `+ s1 B6 u. Y6 c$ ?
    record-data7 R. W* |5 {; h, }
  ]$ e% t9 l* @$ s" S' O/ }

, g: Z7 z( ?7 g: a  ;; give the turtles an initial speed# E# i; z3 a: W- s9 p( z, Q
  ask turtles [ set-car-speed ]
1 X5 ~* o: ?& V
3 D2 c+ A. \+ ^  t# g  reset-ticks7 H% }) E1 K2 L7 ?9 @  v
end5 v; H9 J7 @% t8 t8 q4 z5 [, P
) f8 y; @" j7 L/ U" I, z3 p6 t
;; Initialize the global variables to appropriate values
/ P" S$ b4 G: G4 E5 ato setup-globals
2 ]% j8 l+ R8 d0 h  set current-light nobody ;; just for now, since there are no lights yet: ?( U1 ^* _1 K
  set phase 0) k+ p$ u( L( U6 I
  set num-cars-stopped 0& E! X# R* r; o" {6 y( Y
  set grid-x-inc world-width / grid-size-x
, M& h* q4 }6 o  s: Y  set grid-y-inc world-height / grid-size-y$ i9 |" G0 V; U' c9 c2 U  u

7 v2 k5 F' X4 P  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
& G7 e4 R) W7 S$ X  set acceleration 0.0994 W$ K' i, V& z3 `+ `' G
end+ I2 ?" `2 w1 p( W* J( D% o

9 u; j3 c" w6 M, k5 D;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. b0 T6 h. [9 G0 j9 P6 ]4 R4 b) T+ ];; and initialize the traffic lights to one setting2 Q* V/ q5 W7 a; k
to setup-patches
# P7 P$ \/ |+ B1 Q( I3 G8 Q) C8 S6 Y  ;; initialize the patch-owned variables and color the patches to a base-color
0 t' t! k& }+ e+ p& v  s/ M3 Z$ ?  ask patches
2 s4 L( F% m4 i" i$ m% \9 d  Q  [0 y* E5 W- e6 G0 O, a5 _
    set intersection? false
6 z1 ?8 Y# y% ^% k    set auto? false' \: p( t8 g" d! p$ P3 M6 z1 G5 u/ B
    set green-light-up? true# N9 p3 O4 y/ A2 i
    set my-row -1
$ X2 }; H1 Q! w5 W' @7 S    set my-column -11 h6 t/ x9 V9 S6 r+ q
    set my-phase -1* A, t$ \* N& v2 V+ Y' q
    set pcolor brown + 3
: y; I: ^3 `" W0 P) N  ]
: S: }- @# E% z; Z* i0 r  o9 U; {3 V- E, I0 o( q" T5 a4 X
  ;; initialize the global variables that hold patch agentsets/ }( m; O9 t: x: Q7 c' J/ K
  set roads patches with; O- l; L' |3 L* d7 f2 K
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) c& C) [8 e, E: V
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ |: K9 |/ i. v; q* T( h  set intersections roads with0 o2 h6 w3 j( c. \: A  }1 `, m9 y# b
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and% E( l* K) m- x% ?2 A3 B
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& b& p8 t$ q) |7 O( j8 k8 u
9 ?# x! O/ d% \. [/ [7 Y6 t
  ask roads [ set pcolor white ]) s( p- q, r# E( n8 x' i5 H3 Y# K
    setup-intersections  `3 }! v9 i& \' n: f* H
end
: ]( z$ D$ e& j( J# C1 h其中定义道路的句子,如下所示,是什么意思啊?
0 w" }; {  i4 h, \1 z! R5 V1 k set roads patches with4 n: o" b: b& s" j5 i$ c
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 {' |2 ?- H3 k; e/ ]* R    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" h- w0 C& I' [3 m* x' 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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