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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。
, x( ~% u6 R4 }2 I3 qnetlogo自带的social science--traffic grid这一例子当中,* D5 s% q( F: z7 B
globals
' Y6 H0 w8 [- ~# M. ][
5 A* S0 W/ n- v8 T5 ^  grid-x-inc               ;; the amount of patches in between two roads in the x direction
5 X  T" ?6 O/ E' S. f  grid-y-inc               ;; the amount of patches in between two roads in the y direction
7 J* u1 P1 E/ N( Q1 q  acceleration             ;; the constant that controls how much a car speeds up or slows down by if4 f9 b" O7 u  }' D1 E" w' t8 Z
                           ;; it is to accelerate or decelerate+ S! T, b) t. I
  phase                    ;; keeps track of the phase3 @5 X7 ^2 a% \! V* {% x* z
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure+ g" M4 N! X: h
  current-light            ;; the currently selected light
3 d- |, f+ _) c2 B8 ]3 [2 a7 h3 M# i& P) c
  ;; patch agentsets$ c- @, z" T2 J; z/ Q, g1 }
  intersections ;; agentset containing the patches that are intersections
/ |* d1 a& R$ E/ L  roads         ;; agentset containing the patches that are roads
; D, s0 N  g. p3 f" P]1 I3 ?& z. u4 `# E0 \
9 Y- s# ~' }' A
turtles-own
9 @" ~/ Z- g1 z; Z$ s3 s[& @/ j0 W: X+ f% `
  speed     ;; the speed of the turtle
" ]" R+ k6 N  T. K+ ?6 ], K" ]3 `  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
" U/ W& H! E0 L% J3 d$ s  wait-time ;; the amount of time since the last time a turtle has moved% ?9 c0 Z1 F+ X3 Q  n0 E, ]/ K
]4 w' t8 K1 o- p1 L, s7 r

" \$ H! t1 s9 P; Bpatches-own4 y5 R8 ]: T' q. _, k
[3 |2 H2 h  r* ?( w* v0 b& e7 C% K" Y
  intersection?   ;; true if the patch is at the intersection of two roads4 S7 G& N, D; m  P
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
/ j7 E, R9 O; x                  ;; false for a non-intersection patches.; c! p/ `5 k" Z: g! g& O  R
  my-row          ;; the row of the intersection counting from the upper left corner of the) A, H6 j4 c, i: R% s& @
                  ;; world.  -1 for non-intersection patches.9 r, V2 R. S7 ?4 i, f( Q
  my-column       ;; the column of the intersection counting from the upper left corner of the
. ~0 H7 b2 _8 e  i6 ~                  ;; world.  -1 for non-intersection patches.
1 `+ a8 [* M+ x: j) |  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.3 A0 I. t0 n  q7 a. g1 F( m9 x
  auto?           ;; whether or not this intersection will switch automatically.
( g1 v, x+ r+ N! c* C) p' ^                  ;; false for non-intersection patches.
" K. G# H+ _( t3 N6 r. S, Q]* ^8 p+ e" [; M
  z: r1 C, t2 g% {7 h
% A& S6 z% R% S  n
;;;;;;;;;;;;;;;;;;;;;;$ I+ p" A1 f7 o3 H
;; Setup Procedures ;;
0 ^, c* D1 F& m/ i' C: I% U9 o;;;;;;;;;;;;;;;;;;;;;;( [# O! L3 q  j% U4 y. a

$ p5 d# s* x& r: k% C;; Initialize the display by giving the global and patch variables initial values.! h  O; o' |8 ~! m! Q
;; Create num-cars of turtles if there are enough road patches for one turtle to6 ^; N8 |; k5 m! P
;; be created per road patch. Set up the plots.
! g* H% j6 T, Mto setup
3 _9 `. R% p1 G$ R" k9 ~# b  ca  z* `5 E8 l5 e& }& j
  setup-globals2 A- F7 O; |+ G5 O7 U0 K8 ~

0 Q) n! U/ @" P! i6 c+ x: s  ;; First we ask the patches to draw themselves and set up a few variables  y& ~8 b9 |- o9 g# A2 C
  setup-patches% e; G$ T: f1 B3 L# _' U3 ]' X
  make-current one-of intersections  V& z0 [. P; u
  label-current; n, h" L$ C6 W

( P3 Z, F8 [  ]) C6 I& T  set-default-shape turtles "car"
9 S  ~) O, T* a' R3 k
& }' U5 b0 _" W% |& |8 B  if (num-cars > count roads)% g1 F4 B3 S  Y
  [! ~4 K- {6 f7 I- F. P
    user-message (word "There are too many cars for the amount of "* _* p6 R  Q- X% q
                       "road.  Either increase the amount of roads "5 T) d* o6 ]# e
                       "by increasing the GRID-SIZE-X or "7 R1 P4 @$ Y+ x  M! ?1 n
                       "GRID-SIZE-Y sliders, or decrease the "- n: g/ }5 ]  H( ~7 K
                       "number of cars by lowering the NUMBER slider.\n"
; }0 T$ O3 N2 y; t2 L. c                       "The setup has stopped.")
9 J3 e$ m6 b9 x$ E0 U/ L, q    stop# p. i8 a4 }7 t6 M  [. C
  ]3 K0 I+ V+ e2 S3 v$ A

* f1 ]9 a! [  h0 @0 j6 M2 I- T  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
* ~: z. r6 c' }; }  W9 F7 I2 j  crt num-cars2 g' @. N& A4 d
  [
: `% A7 T: a) W2 n* f5 N    setup-cars9 L& i, B# F' m4 u6 @
    set-car-color' l( U4 \3 }3 e& x4 U% h
    record-data/ [* Q3 d6 Y: x/ f+ G* ~
  ]( a$ }7 v- N2 k3 s7 m/ _1 [" ?5 b

2 T- ?& ?, v4 E- m  ;; give the turtles an initial speed% _- a8 a: p8 A7 x/ F* \
  ask turtles [ set-car-speed ]
$ ?) p, `. V( g) C/ o8 q6 k
7 p# Y" m  ?! u( O: @. L  reset-ticks0 m* r( g# q# t. l8 ~! |
end
3 V9 c' v+ \- \$ o/ N9 A5 K+ D7 w# i
;; Initialize the global variables to appropriate values; F3 B- W6 c5 w2 l
to setup-globals  C! C2 L, d# P" T; h
  set current-light nobody ;; just for now, since there are no lights yet6 Y1 _0 _2 _  Z9 K
  set phase 00 T2 U4 S" u9 x1 X; ]& U0 ?  M" D
  set num-cars-stopped 01 p  V2 ^8 E3 E+ b
  set grid-x-inc world-width / grid-size-x
/ D" S1 g- |- U# _9 V  set grid-y-inc world-height / grid-size-y
" a8 o1 D8 m5 ]$ y$ S& A0 h0 x$ T% H8 [" |" e2 d; [
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary8 G% z2 l' X& X1 n1 o* l
  set acceleration 0.099: X1 L6 b2 i3 G8 i8 ?
end, w) [& m4 k3 y( q
' y9 q/ c0 }! m/ n: U' W1 U. N3 `4 A
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 G, z! h7 L1 N# {
;; and initialize the traffic lights to one setting
* R# L5 F# p& yto setup-patches
3 s8 m$ i7 N3 _6 h+ }" b* i  ;; initialize the patch-owned variables and color the patches to a base-color: Q4 u; R& D6 ~2 \
  ask patches
5 H. O1 h! e+ I' h& g  [
# K% @* O3 ^3 O1 @/ X: F, ?    set intersection? false! c( U8 _! ?$ T4 {) d
    set auto? false  }  M3 V$ f2 S  O9 Z0 j- x
    set green-light-up? true  I0 L" k( L" l1 i
    set my-row -1. Y: L  ]$ Q7 `! c& t
    set my-column -18 p5 N+ D3 h: U9 J! w' `$ ^
    set my-phase -17 c! i" r0 X& F
    set pcolor brown + 3
* j, A4 C3 k- R  ]
* V$ ~9 z1 F9 s6 R2 F
1 e# g+ r! a  g! U% n; G  ;; initialize the global variables that hold patch agentsets
% r/ m& N. O4 K( P7 _$ J  set roads patches with
" n8 w4 y0 |- x$ t1 v! y    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; i& Y, n! A, {8 @1 M    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
( y( h; `, Q! U" n; ^  set intersections roads with
$ A% s" X- b4 |! G% e    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
+ _* y- n( H# r/ G$ ?' H) z    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ a2 j5 ]' V3 ^1 P
% r& w$ y4 B. {+ m' m  ask roads [ set pcolor white ]( y9 N8 F5 E) h( ^$ ?7 s6 h
    setup-intersections
- U; j' d- J- v7 Y% n" i" M9 r: Yend, m! ~/ T7 q# P/ V6 F
其中定义道路的句子,如下所示,是什么意思啊?
' n' {- G. @% i1 h set roads patches with
7 h; S" `  ?7 I' V9 j; D/ x5 v' j    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 U# A. h  N8 _6 ^8 g
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ q8 ~9 v5 S6 O! t: J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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