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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。6 W7 ~$ A9 x1 Q
netlogo自带的social science--traffic grid这一例子当中,, A2 [. W' {  b
globals
$ q9 M0 |% w/ ~6 A/ @# Q$ d[6 H. I2 J0 }3 [/ S+ f
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
2 @6 T( @. A% N) f  U6 J0 Z  grid-y-inc               ;; the amount of patches in between two roads in the y direction
% J5 M# \: b" f$ M  acceleration             ;; the constant that controls how much a car speeds up or slows down by if. @% y9 _- P& }/ D
                           ;; it is to accelerate or decelerate' d7 w) ?( L& N/ P+ k) x
  phase                    ;; keeps track of the phase. C7 m. E) F) H+ X+ L4 Q9 {/ A
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure9 J  T$ ^1 S( t! X( ^
  current-light            ;; the currently selected light
9 ]8 H' B) T. G1 K
4 }, a4 A1 N6 |  ;; patch agentsets
  U& }9 A0 z+ U  intersections ;; agentset containing the patches that are intersections6 [! {+ h' Y7 M
  roads         ;; agentset containing the patches that are roads$ {8 q+ U8 E& B6 _4 J3 @1 o
]
/ l5 y. b8 H0 @6 n! Y  m" ]
: b( p- {. k6 ?+ Y; L! nturtles-own/ T1 S- t3 p6 ?( ~7 c# ?1 ?
[& w! H0 r* a7 u1 w, U: P
  speed     ;; the speed of the turtle
1 L/ p. x2 _0 E! H  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
! ?3 U% P$ ]& F6 j$ p" d1 ]% V3 p  wait-time ;; the amount of time since the last time a turtle has moved
3 }5 C6 O4 s# Y5 M" L' i]1 {# I6 r" j& D6 A

) j4 \# z0 ^* R: e% d9 l. cpatches-own, R& S* A9 Q1 {8 D
[
7 G7 `+ M' P0 u  intersection?   ;; true if the patch is at the intersection of two roads
* K0 A$ A3 R5 p! v( ~3 I. r  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.. m, s; ?) K' V! v2 m) F9 V1 B
                  ;; false for a non-intersection patches.$ }* x2 C- H; I  _0 w1 i! H
  my-row          ;; the row of the intersection counting from the upper left corner of the
( _- M* |+ I! q                  ;; world.  -1 for non-intersection patches.
) G+ }7 j; [# O0 t8 v. F: z  my-column       ;; the column of the intersection counting from the upper left corner of the. p8 ?( X! ]; {, y$ o
                  ;; world.  -1 for non-intersection patches.$ Q, k/ D, l9 Q# N
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
4 g- [8 o  C5 K) P# C  auto?           ;; whether or not this intersection will switch automatically.
- A( [4 a2 Q' m( X, V                  ;; false for non-intersection patches.. f* {0 I' s* T
]
! Q$ M7 Y4 t% |4 h( w, x7 c, N1 @5 n
+ S, `& u0 V3 L- L% X0 j
8 Y1 O# ?* K1 y# K;;;;;;;;;;;;;;;;;;;;;;
/ ~+ C' P# Z5 E6 P# V( Q/ `8 U5 ?. q;; Setup Procedures ;;; j/ `; M! i' s! z  {
;;;;;;;;;;;;;;;;;;;;;;
! _5 |4 @9 c, w& {! r# B% Z) y( A- T, _
;; Initialize the display by giving the global and patch variables initial values.$ y; D6 X% }& Q. c0 n' x
;; Create num-cars of turtles if there are enough road patches for one turtle to
  D/ C8 P5 D( m- r, k' ~! O8 w;; be created per road patch. Set up the plots.# q3 Z; [1 w1 V$ l
to setup
9 }. s6 I/ A0 z3 l0 b. j5 S( `  ca
( Q7 B5 p% X' o$ S) {# Q  setup-globals3 O1 F+ i; w4 o( r
  H! G( z4 J6 b8 _( D- u9 j5 X2 ]' G% `
  ;; First we ask the patches to draw themselves and set up a few variables$ v1 }" q6 k% m4 ^* E
  setup-patches) ?0 K  _' M, P! c+ ]
  make-current one-of intersections; l% `0 O" b7 U' [" ^  k. W, x% h; f
  label-current
+ n& [4 Z4 N& ^$ t) d- t$ C: [. }  J+ p# D2 U' e7 r
  set-default-shape turtles "car"
/ j; Y, g: r% `, k2 @  N1 V3 c" K
. l1 Z: K# q. L5 l' d9 h1 q  if (num-cars > count roads)
, g, Q- r5 F& y/ t  [
; [0 f9 c! T" p, A    user-message (word "There are too many cars for the amount of "- w* J; r; x$ f" u8 Q  r
                       "road.  Either increase the amount of roads "$ \8 g8 `/ b6 \. }& }* j- S' }
                       "by increasing the GRID-SIZE-X or "* R5 Z( ~9 s' F: j8 G2 D
                       "GRID-SIZE-Y sliders, or decrease the "$ P5 F: U) w' d( v/ c
                       "number of cars by lowering the NUMBER slider.\n"0 M0 M  C- y- c( r$ o5 M
                       "The setup has stopped.")
3 r% w9 o; k; p    stop
! z" X6 [7 Y. f/ M  ]; k; Z. F* d' e+ Y1 V
( b( L+ w) v' \, w: ?
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( `+ j: @8 i& w3 h9 p: ?! a# k8 T7 B
  crt num-cars* `0 v( t" F+ o
  [
1 [) {6 O7 J5 z% q' w, c  I; E    setup-cars
1 n; ]/ P* ]  _. q  f! W    set-car-color
* d4 X3 A) B8 h* Y    record-data0 U; K! x( Y# S5 q
  ]8 `6 j7 P1 T) K% S
& R4 M4 H: E/ u0 l+ \' e
  ;; give the turtles an initial speed# _$ d! ]  _, g$ `( W% u' H0 @
  ask turtles [ set-car-speed ]& K: f" O+ X% H& ~. c, t
7 i1 q5 J6 z- [9 q: V; N6 i2 z
  reset-ticks; G" B, x& b* S
end6 `/ P# q# R0 X! Z8 u

# q- H' P* {" z! @) t+ q0 Q;; Initialize the global variables to appropriate values
) U0 l' r4 S% f, U' X1 nto setup-globals
9 O" E% c, b& g$ K  b  [  set current-light nobody ;; just for now, since there are no lights yet: d' f, |3 t5 R- t7 w
  set phase 08 }4 B! s2 ]0 E# f% A. [
  set num-cars-stopped 0! P; }+ u$ w( l& ?# z
  set grid-x-inc world-width / grid-size-x
& ]/ V5 t/ C4 _0 X9 P8 G  set grid-y-inc world-height / grid-size-y
! e' G' T+ j5 v" |# |2 S
; {9 ?( C& \' D2 q2 y2 n7 x  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary& V/ D/ S" \5 h9 o* X  y2 c# Y
  set acceleration 0.099
* d% ?$ P/ @5 }/ z8 M4 O7 U" _end
+ Z6 s/ q2 {6 [/ {! j) R% s' Q( x# W% ?
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
5 J0 j3 I. E* t  K/ W, B, ?;; and initialize the traffic lights to one setting
& e0 u  Q1 p4 u: j4 K3 Fto setup-patches
6 t- T  q9 r* j) z# F  ;; initialize the patch-owned variables and color the patches to a base-color  D8 g  C3 B2 U& u9 |/ a
  ask patches
' V" M" k- r( V# |: ?+ x5 w" Y" v  [3 u% [4 @* {$ n9 c- ]) ]
    set intersection? false
6 J+ o: ?+ {/ a  G- i& b    set auto? false3 I- ?' s5 |# n: F3 e. Q" V
    set green-light-up? true) q9 r% V/ u2 X7 ?5 r
    set my-row -1' C: }, I% q7 Y/ h3 i3 q1 n
    set my-column -1+ q+ [# I: j  f; f1 h
    set my-phase -1; G- ^" r; V- Q) I$ d
    set pcolor brown + 36 `' s: ^6 \; r6 w
  ], d- f' `- q) D; K: \
$ l4 l. q4 v; {: G0 r
  ;; initialize the global variables that hold patch agentsets
! N; F% Y- U, }4 V  X  set roads patches with8 w; R" u  f$ f3 x; {+ S
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" E, r3 i2 N+ ^* F9 A+ g
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' H& v! E$ M; k$ ^+ u( P/ C' k
  set intersections roads with! A0 E5 d5 J2 Z5 \! r# o
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and2 ?, D2 b: J4 K: O3 }( \
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ A7 z! q1 |/ v/ B" |
- D; R: q1 \2 Q6 |' X4 M
  ask roads [ set pcolor white ]
+ h. m  ~9 k* A    setup-intersections
" G" v- W1 U4 B' jend
) z# t' w6 a3 n* z7 T  S其中定义道路的句子,如下所示,是什么意思啊?! A1 S7 p  [* Y1 p
set roads patches with6 J; }6 n4 w: b& a8 R
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- F" l7 B2 V9 T0 i  |    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! K* e& |" f) E$ x( Q( n' [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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