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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。
1 C5 \' ~% q  W6 q4 m7 n  jnetlogo自带的social science--traffic grid这一例子当中,, Z4 u) i' ~  K
globals
' _; Y4 ]2 }. o2 B. k8 x7 `7 K[# @  u0 _* O7 `! G8 u1 N8 T) P8 U
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
# s; B/ ^! @5 K  F- |  grid-y-inc               ;; the amount of patches in between two roads in the y direction' j: ^) j# K- i( T4 f' `% U
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if3 F! y, V' Q1 |- F3 A- e; L
                           ;; it is to accelerate or decelerate
( M+ Y$ t. k! ]8 g( O  phase                    ;; keeps track of the phase
; A5 ]! O8 j# Q  l: j; }  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure! z; \+ @$ n4 t  F
  current-light            ;; the currently selected light9 n9 j" E0 u; w& |* \
2 c/ f" }4 x, ^" Q
  ;; patch agentsets
  D" E, z7 I( a  intersections ;; agentset containing the patches that are intersections
9 w' g7 J6 F2 ~7 o1 d  roads         ;; agentset containing the patches that are roads
8 g9 m0 P5 s+ y4 x/ F0 e]
3 G4 z! N& R$ a7 Y$ l7 `! I! N8 E5 \
turtles-own* V" Z/ k' z2 o) S$ `- ~5 A  y
[% _$ r+ ?! b+ s* D; _( {
  speed     ;; the speed of the turtle
$ i( ]- L; [$ K6 l6 O/ i7 {- K+ ]  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
( F% E) j* b& H% H6 I  wait-time ;; the amount of time since the last time a turtle has moved
+ W+ l. A+ b+ P& ?) v]
+ m: G- f) j$ m: G- [4 g9 ^+ W
' o4 H" U7 g4 b( }3 e0 \patches-own8 e8 ~0 t  j* D0 _" Y: m
[" f1 Y3 c  `4 I
  intersection?   ;; true if the patch is at the intersection of two roads+ r$ i* Q1 ~3 K' v; F! _0 x
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
$ m' u2 S& C: {3 N9 F' o" D                  ;; false for a non-intersection patches.1 u# m4 R/ L# h; E& h) Y
  my-row          ;; the row of the intersection counting from the upper left corner of the( e: R3 {" T$ e. ~! u* @
                  ;; world.  -1 for non-intersection patches.
# h6 Y1 }& M' t+ j$ m8 i  my-column       ;; the column of the intersection counting from the upper left corner of the
% ]3 `9 t% a4 y1 h: f/ D" R& d                  ;; world.  -1 for non-intersection patches.1 U) I7 q/ `  {6 A( [8 {- d+ |
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.9 x8 `3 M8 I: {. p, }0 Z
  auto?           ;; whether or not this intersection will switch automatically.9 \7 G! s; `) t) G9 b/ `: N9 t3 c. s5 S
                  ;; false for non-intersection patches.
. z  b! K, X, x% C]% f8 ^) Z$ W2 P& n' |5 ]7 @

+ N2 ^1 k- T. a  ]" J: M+ s. o9 ]# F
;;;;;;;;;;;;;;;;;;;;;;8 w' q' K4 w9 _; L) M
;; Setup Procedures ;;6 P! s) X8 c2 }+ o3 x& y% {
;;;;;;;;;;;;;;;;;;;;;;
3 B3 ^5 w. p1 Z! z1 t3 _- T, d! p/ a8 H) g# t$ w) }
;; Initialize the display by giving the global and patch variables initial values.
; Y- D. U/ {& K;; Create num-cars of turtles if there are enough road patches for one turtle to4 `6 L6 i' m( h$ |# ~6 h
;; be created per road patch. Set up the plots./ Z$ m& r6 E5 p( }
to setup
, n- N! p* z; |% v- x! k  ca
9 V" y0 V* P7 k* B, W- x; l, V  setup-globals
' Q6 y  [+ P. l) P
2 u  U2 W. R# ^3 A5 b% ~  ;; First we ask the patches to draw themselves and set up a few variables
( x3 @$ G* A5 R9 p  setup-patches
  u6 @* \- |3 C3 _' h& c: v, ^6 ~, Q: ^  make-current one-of intersections
( @" ?# z  U& H  label-current
' @$ s! h: ]: ^2 w1 C0 j, S
) Q$ \9 M; v$ e) `* T  set-default-shape turtles "car"
% X5 ]. A2 y. |# t8 M' \: K. Z  o( Y7 u$ ^$ t6 f
  if (num-cars > count roads)
, V5 n9 \" `5 V6 p% I/ u3 L  [
  K, x- J; s0 a2 j* M3 C$ M    user-message (word "There are too many cars for the amount of "- f! C+ F9 S# O4 m  U  E0 X; R
                       "road.  Either increase the amount of roads "1 w% |5 \  J4 g* ]: G3 K- k
                       "by increasing the GRID-SIZE-X or "" K! w5 S) L' r0 J7 }$ y0 a
                       "GRID-SIZE-Y sliders, or decrease the "
! P; C" B6 Z3 F) h& B                       "number of cars by lowering the NUMBER slider.\n"
8 T. q$ m  k3 b7 ^, W' D                       "The setup has stopped.")
/ v6 a% Y- {: u$ u* w, y) g    stop
" L9 I0 U( f0 {" g* P7 q$ V  ]
1 h$ w) E- |& K$ f0 a
+ t7 d  i- d  i) l& r! k6 d  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
# m0 B; q- |6 r1 s2 f4 g  crt num-cars
0 m9 G! i7 y8 N3 O. L5 P  [
( v9 G8 c0 r) X2 F4 W5 i! k    setup-cars
% r7 W, y; W$ q. ?1 [) n8 a    set-car-color$ b# q1 h" C5 E! f
    record-data
7 p, H' F* V% H1 {  ]  N7 j7 V% n' @, E7 u- C

' o$ m. o9 t9 z  ;; give the turtles an initial speed
( t& y1 H! x$ q2 G) R  ask turtles [ set-car-speed ]) x1 ?  X; N1 I) `& S. O( q/ M9 Z

3 ], P0 m. X) b' e% ^+ {) _  reset-ticks4 N6 z1 y0 G+ @
end
0 L$ T* a" h5 u. `( N* a4 D- ^6 N
- b/ k3 f5 [. p+ N$ n$ z- V;; Initialize the global variables to appropriate values% R$ A: z2 I1 @
to setup-globals
+ u$ S' _4 l* w/ C, p* m  set current-light nobody ;; just for now, since there are no lights yet( F. \4 E8 ]4 S- X* P+ s" l
  set phase 0
- u& r3 n& \) ]2 `# A  set num-cars-stopped 0$ v/ G. `6 u  f" Q
  set grid-x-inc world-width / grid-size-x$ s. S& L# v; v! i' v8 `
  set grid-y-inc world-height / grid-size-y& y% @2 `' v0 ~  D

5 l* b5 B" A" j, \  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
. y) _! |( Z0 g8 ]8 ]  set acceleration 0.099
1 u; P+ w' e. J* W8 |# _- R9 C' Cend0 D/ X$ m9 Y) n' ?# k. c0 }6 C% V
& C& V( P1 @- X  h
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,+ [% ~, x- h2 o( \6 O) B' F
;; and initialize the traffic lights to one setting
" u& @, O3 D+ f, T- V; [( d4 eto setup-patches  J  y) l0 C+ @8 @1 G! L
  ;; initialize the patch-owned variables and color the patches to a base-color
- m  W- z* T: W; A, U6 C3 B4 [+ J  ask patches
- K6 U# G% {5 X0 X$ P  [
2 j5 i$ E. j( t8 A/ I; w6 n; l    set intersection? false
) ^- X% E) V' l: R9 K  B    set auto? false
+ r3 V" c2 v% Y# R    set green-light-up? true* P' E1 \$ K& M8 p. K
    set my-row -1
$ \; X0 z0 M* D: j6 I/ H    set my-column -1
; B& k9 z5 _/ l    set my-phase -1
8 l+ a" U9 C$ K( P' X8 x) r- X4 l    set pcolor brown + 3
" e. a8 I- l5 [" }! ~3 M+ N+ C( C: [3 t  ]# ~, y0 p- j3 g' C: u! \3 O' M

( @8 s4 r" W! }; a/ P) D1 u  ;; initialize the global variables that hold patch agentsets
  V& i, g1 s1 G7 Q  set roads patches with
5 z% h( y* C$ Q# q1 @# S* U    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or* b3 a7 G7 q5 p; S! t. }
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ \7 c8 {/ I; O8 ?* A
  set intersections roads with. D+ Z' \% q/ d8 ?& p) T( H
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
+ l* J- P' ?! I1 a# g' d* A    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 S% J6 J+ J! q" Y* Q

  `6 M+ U$ S6 c  ask roads [ set pcolor white ]
. J: w1 W; k' S8 H) K+ b    setup-intersections3 R7 v4 X) c0 {4 X* d( b
end
/ v8 j: t7 e8 T8 @! v; b" q其中定义道路的句子,如下所示,是什么意思啊?. f$ c* C! J1 t# D
set roads patches with
4 j3 O  S! C" i% b9 l" y5 [    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 W# I2 L  ~+ E$ }! X' g: _
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 u, v9 n4 g6 e
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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