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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。
+ V' @& [3 L0 Enetlogo自带的social science--traffic grid这一例子当中,/ _  I- a9 k& V: `# \' h0 w; D
globals3 Y8 b4 v3 Z5 c6 B8 R8 j: }/ |4 s
[# c5 ?) w9 Z! L: b- t3 k5 e
  grid-x-inc               ;; the amount of patches in between two roads in the x direction6 ^6 f! M) j: e2 |" h. c, ?
  grid-y-inc               ;; the amount of patches in between two roads in the y direction& G, ]% c0 u& _) ]+ f& v1 P) H
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
) x0 T" x( i  _; R' Z) }- }9 y5 p                           ;; it is to accelerate or decelerate0 ?7 M9 C' W# ^6 ?7 x; C
  phase                    ;; keeps track of the phase3 V* q* @6 c1 D7 ?. J
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
$ i4 i% x. ~& v9 {7 m, C4 N! x  current-light            ;; the currently selected light
5 g: W5 T+ A, I2 H- t% C
) }) S0 G1 ?3 W  S8 E! ?! L  ;; patch agentsets/ e! e. H$ [# n' C: d9 s& g5 f  y7 j& d$ t
  intersections ;; agentset containing the patches that are intersections
- |; Y; c; q8 N' g: Y5 ]8 j9 Y  roads         ;; agentset containing the patches that are roads
8 U9 ^. X! h& U]5 F- v/ A' g% c+ S0 ?

5 P2 q, j0 L2 m( Y7 Qturtles-own+ F8 j+ s8 Q# ?  t2 Z9 J
[. T) I+ I' c; f9 R
  speed     ;; the speed of the turtle/ @' T9 H' c8 S8 K4 V( O* \
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
9 v* ?6 `, b! t! J5 Z: @; a  wait-time ;; the amount of time since the last time a turtle has moved. `+ F/ F: n, D* d/ v, n, d5 Y
]
* m. ?. d  ^+ w, p" S! Z
( _  d( y! [( \! H3 Cpatches-own' y/ }+ e7 p* O1 r3 t
[2 f  `0 Y, z# F8 }! b
  intersection?   ;; true if the patch is at the intersection of two roads; A! ~' T( r% ^2 _- a9 ~0 T/ |
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
, l. K; `$ K2 y7 f                  ;; false for a non-intersection patches.
, _  x- x. l7 P  }" w! Y  my-row          ;; the row of the intersection counting from the upper left corner of the% {, v: G* @. c7 B, q! w4 c
                  ;; world.  -1 for non-intersection patches.4 R" M4 V6 C3 v5 v* K/ J
  my-column       ;; the column of the intersection counting from the upper left corner of the
$ }1 X$ @1 t+ O$ n9 o( S                  ;; world.  -1 for non-intersection patches.2 {9 m, ?  @- o6 N; ~8 j
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.6 X' \5 }& I# A2 y0 [- s
  auto?           ;; whether or not this intersection will switch automatically.
5 k3 u) `# b: l  @% {, S                  ;; false for non-intersection patches.( W9 [) g- O& T2 Q
]
2 v+ p/ S2 e$ ?, K3 w* Y4 t, [2 C! \- J2 [
6 b0 z* O3 N) @: ~6 s% A6 P
;;;;;;;;;;;;;;;;;;;;;;# v5 a* B5 z3 v- O; F
;; Setup Procedures ;;" P+ H& _( V: `- i+ k# {' a' j/ F
;;;;;;;;;;;;;;;;;;;;;;
7 d& M% {9 G1 X/ P; V* I. f, D! Z/ Z) x9 ?
;; Initialize the display by giving the global and patch variables initial values.8 z9 j/ u# D4 Y8 ^* q7 X5 |3 \: X6 K
;; Create num-cars of turtles if there are enough road patches for one turtle to
7 f2 s5 P, I5 r( V7 o7 G;; be created per road patch. Set up the plots.' `% }& y- b' N- H+ {4 i
to setup% K! [4 R$ g0 ~, ^- d
  ca
9 B( w$ _& _) Z7 z7 \  setup-globals
/ W; K& v8 k' C! n2 Y2 d4 b
: N+ S6 F  L/ x8 L) |6 B; U& P  ;; First we ask the patches to draw themselves and set up a few variables% @  y+ F" o" m. L
  setup-patches, y6 p  d& d: H3 l7 A
  make-current one-of intersections2 Q1 h$ Y1 S; j- a
  label-current  s- R7 r* w4 [' Q6 s& i3 t; C
6 r7 A3 J- o4 Z1 W
  set-default-shape turtles "car"* R( K! @5 k7 s0 H
  }4 ^$ \' N6 [7 F& B& \
  if (num-cars > count roads)+ e8 x6 T& |7 d3 d' V# }  [4 g
  [! o( H6 x( W/ x4 E6 z6 z2 |) d
    user-message (word "There are too many cars for the amount of "% P; E% h  m7 U$ m
                       "road.  Either increase the amount of roads "" G( S4 C# g" Q& D
                       "by increasing the GRID-SIZE-X or "
: T  T9 V1 q4 _                       "GRID-SIZE-Y sliders, or decrease the "
% y) X: z$ t3 K( }  t                       "number of cars by lowering the NUMBER slider.\n"* r, r' F( \8 a' F# n1 _
                       "The setup has stopped.")
5 \9 U8 }8 d- {) X' n* f! p% f5 K    stop
) Q* R% U! l: A. U3 Q% ]6 d( W  ]
( j8 ]9 b  j0 l+ N4 B0 H0 O. m' [  ~# M
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( D! Z& h; y( ~% F
  crt num-cars( N$ S. m: a) P0 M2 B
  [
% z- d$ m; M* ?# n; h    setup-cars
. L+ d" w1 C, f8 V: H  d    set-car-color) I6 e- t7 f0 z* N$ U6 i7 N
    record-data
% Y, p0 a" w* _/ W3 c  ]( i9 Z. c  o! k) ]$ L

+ d, I# O! j0 G9 }" t! {. Z: V  ;; give the turtles an initial speed0 Y, q7 U& M1 p% j% x
  ask turtles [ set-car-speed ]4 q" @% F6 t2 k4 H( l" j5 u

- M4 P5 p8 b; X3 a5 f1 y/ g' T: q  reset-ticks
4 Z7 h2 _8 W. G4 h0 ^6 xend
/ a3 ~" y' s& Y4 g+ f" Z
$ a/ w  D1 q* i  @6 ]* E4 V;; Initialize the global variables to appropriate values
! c3 U3 F: z# |- e. @to setup-globals& |) J2 b& ?, M4 A+ N& t; H% V
  set current-light nobody ;; just for now, since there are no lights yet4 G6 I3 r( Z. i( F4 H
  set phase 0* Y8 A  ~1 W' Z7 q$ {. Z
  set num-cars-stopped 0
3 N# F: V4 D' Q  set grid-x-inc world-width / grid-size-x+ n3 }+ e% P& m1 e0 v1 Q& k5 d
  set grid-y-inc world-height / grid-size-y
0 b' V; b' i7 v4 T1 H) v2 Y; V/ l) m! B( [
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
4 P+ U9 D  j) b: h. L1 j& O: H  set acceleration 0.099) ~8 N7 X8 }" S9 I4 A
end5 A2 P* p. ]* B8 l0 x2 _

& Y4 ^$ {$ K& ^7 P$ m7 a! \;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
5 `4 u  R8 Y  b, f8 I+ @; V;; and initialize the traffic lights to one setting+ U/ O; L7 I4 W
to setup-patches! F& e# F0 y/ G4 H9 ?) {
  ;; initialize the patch-owned variables and color the patches to a base-color
4 c- i2 S* z# i- {  ask patches5 C5 s6 ]1 O' V! S0 O1 C. h, [
  [
/ v# K: ?5 l5 {) y/ ]. v    set intersection? false
$ s- n; x2 L1 k/ f2 \    set auto? false( ?8 g! u; F6 C7 J) v3 z
    set green-light-up? true5 E7 Y/ N  M# s3 _9 ^$ |$ U
    set my-row -15 p6 @0 m9 \; b0 e, o, j5 t4 M
    set my-column -1
- p5 q1 d) d7 w2 z# e    set my-phase -1! x, z: s& e% _4 i; r: M1 H' F0 q. S
    set pcolor brown + 3
2 @: {/ _3 X2 {7 V5 I. b) N  ]3 a& }5 |5 z. i, S* B' x
/ B9 q  S6 [9 T% \  T% F8 N
  ;; initialize the global variables that hold patch agentsets+ u9 f. M( `' |/ O( h6 @
  set roads patches with
; w' _8 A5 d% e, R4 d5 i/ M% ~* m    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or  }; d9 _; O( [$ m2 K5 |
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& w2 N9 y) t: ^% N/ `$ T1 Z! b; v  set intersections roads with1 h1 W) a# S9 d% g1 C1 [
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and* w; \: Y) D  i, ^1 {2 Z5 R
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 @6 s4 O4 B' O( @# A! r1 p& j% a, \
  ask roads [ set pcolor white ]
0 X$ D2 @' h0 R' [* N' Q0 w) i/ i    setup-intersections
1 f7 ]4 F: m# ~end
9 W# Y0 W0 z0 N1 @其中定义道路的句子,如下所示,是什么意思啊?3 X) g, [* _' n9 N$ J0 M7 j
set roads patches with, N/ b) _. @" E, D3 w
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, h5 a- Y- K4 w9 |- Y
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ B' |' |' x. [
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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