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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。
  o! c( [, f$ w- P  S' F' n. E' mnetlogo自带的social science--traffic grid这一例子当中,
* Q/ z5 k/ i# Uglobals
* L1 ]! |: v* Y  q% j7 b[
  N1 E# i8 p" ?$ Y( N* x2 I& n4 ^  grid-x-inc               ;; the amount of patches in between two roads in the x direction' L9 @2 @1 K) f6 j  u" T
  grid-y-inc               ;; the amount of patches in between two roads in the y direction2 A' U8 p/ [, F" a2 R0 ]
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
) w8 M7 U0 a0 c  L( t: r0 X                           ;; it is to accelerate or decelerate
3 I# |) r, }6 b1 J/ T4 L$ D  phase                    ;; keeps track of the phase
( C) z* H1 q5 ?' V9 T9 I5 @! S  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
! y8 _5 a7 N. N, g  current-light            ;; the currently selected light$ d$ w! c* k- H6 a

) h0 |, F: q, A0 j0 _! ~  ;; patch agentsets  k4 u& k6 ]0 {; Q) O3 w3 @7 p
  intersections ;; agentset containing the patches that are intersections% m) X4 ]2 ~2 X" n6 w
  roads         ;; agentset containing the patches that are roads: D: b" ~/ c' l; m
]
! {+ T+ X& g1 O; e5 X5 d7 V
! l2 I$ G7 [' Dturtles-own$ Z- d9 _& J0 D' e
[$ W) U7 {# m6 k. j' L/ S9 J  \
  speed     ;; the speed of the turtle4 y5 z  J8 w% `  }! P& N- ]1 Z
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
% R+ H0 E0 Q0 ]  {  wait-time ;; the amount of time since the last time a turtle has moved3 O/ d: t# h: G+ a' @) F0 g) y% R
]& i9 `7 V; s5 @' E2 Z8 C
7 r* ^3 E4 n. X9 t
patches-own
8 K3 F. C+ p+ P5 |# `$ {* W[
+ d& v4 T! v3 K3 z9 P. e  intersection?   ;; true if the patch is at the intersection of two roads( |! f' ~- `# W3 X* W0 r
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
6 K& G- k) t( o                  ;; false for a non-intersection patches.. ]; f. [5 l8 F; U7 m6 _
  my-row          ;; the row of the intersection counting from the upper left corner of the
3 a/ J! r  Q3 o                  ;; world.  -1 for non-intersection patches.
$ p; n2 O7 L: O& I, ^) \  my-column       ;; the column of the intersection counting from the upper left corner of the6 }$ S8 j+ l" i. J* l" A
                  ;; world.  -1 for non-intersection patches.
/ c& b4 ~3 z' ^8 `1 P5 a  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.0 Z1 C& o, k0 x5 M7 |/ I) f2 |& N
  auto?           ;; whether or not this intersection will switch automatically.
- t  Z5 L' @, l; ?& I                  ;; false for non-intersection patches.
& a* l) ?3 l" A" J+ c]
# A0 ~+ x$ x) o% m- q' o' l7 Y! J5 d; ~6 C; q. Y7 Z  ]+ O) \, i
4 q; I% r) T/ X* \1 d+ t# a* q
;;;;;;;;;;;;;;;;;;;;;;
( C. X9 R# N0 C, O;; Setup Procedures ;;
  R; f( H8 [9 G1 @7 N;;;;;;;;;;;;;;;;;;;;;;# l# z2 \6 |/ K

' Y9 e; T* z$ a  N9 T2 B;; Initialize the display by giving the global and patch variables initial values.% d8 Z9 r  l" \$ n" S1 Z" @
;; Create num-cars of turtles if there are enough road patches for one turtle to
' {% J+ K1 W2 h1 g;; be created per road patch. Set up the plots.
) F! q: p! L5 H" Zto setup
- _# Y. ~7 G7 I& l' f/ c# d. N  ca) W' j2 p6 _6 e0 B( d$ ]
  setup-globals$ |) K' D# Y) ~& l- K! [, [" l
* _8 A( _. P/ j! s/ ?" a* a
  ;; First we ask the patches to draw themselves and set up a few variables
7 r0 u" o: t0 i. C5 _2 @  setup-patches5 L( f% ^+ k3 u3 Z& U9 B. O
  make-current one-of intersections
, t. w. L; \# K" Q% Y; T! T+ Y+ P* r  label-current
& c0 _* e1 q( j) F' x9 p9 x% G$ e) l' q% W5 G% y- T- C
  set-default-shape turtles "car"+ [) R7 `! D- O0 r
9 k; D+ R+ E0 s- u8 {. k
  if (num-cars > count roads)" n, h; Z' z5 u
  [( S' W7 ^4 N/ g% j0 |7 V& |8 A
    user-message (word "There are too many cars for the amount of "
- Y& Q1 i9 u: e! p1 @                       "road.  Either increase the amount of roads "1 l9 @; q1 A& T' V
                       "by increasing the GRID-SIZE-X or "
7 W: Y, k2 B1 g! p                       "GRID-SIZE-Y sliders, or decrease the "
5 ]/ K, ^0 j1 Y                       "number of cars by lowering the NUMBER slider.\n"
# H% e+ F' w" d, \- ^7 I                       "The setup has stopped."). J, s2 S9 E8 K! {- t! c0 W
    stop
1 W& ^5 Y; T* R0 ~" ~: k  D: H  p9 T  ]
* X- C4 l; a) {- x# L4 |2 b
) t/ X/ o$ b( T& u  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color4 {; t3 h1 U1 H$ r+ t
  crt num-cars+ C5 b2 Q9 U* `9 J
  [5 Y) ]! {$ u4 h) y1 ~$ ]* ~% h
    setup-cars8 K: \$ W' D: z& M, T! `
    set-car-color" j. H; P6 D- V: c1 o3 \; r
    record-data
" O. c4 ^5 K& L' d6 e; H  ]: J2 g1 V( n1 [3 Y& t0 _7 g2 M

, r& U, Z5 d' w0 ~8 [9 @! O! i1 J; t  ;; give the turtles an initial speed0 a3 @( g6 Y+ O: f8 Y, o
  ask turtles [ set-car-speed ]
4 @. I4 b2 E' E# `, T  [
  H& V3 i3 X1 H  reset-ticks
/ s1 p$ P- S; w& G* Xend
2 r) |/ p( {! s7 d8 T" [6 B8 M, X# `) a1 j
;; Initialize the global variables to appropriate values
+ y, |" c2 H+ k  Zto setup-globals
( G7 p: ]6 k: ?. O& o" Z  set current-light nobody ;; just for now, since there are no lights yet0 h5 D, S( s" m. D7 N
  set phase 00 i+ t( E* q' e- J  |
  set num-cars-stopped 07 x5 f+ K$ k  J7 U; \9 A
  set grid-x-inc world-width / grid-size-x& W5 a2 d, @4 }" s) @. O
  set grid-y-inc world-height / grid-size-y
+ Z+ Y" J- r4 l. f. O. |
, B( ?0 }" P4 s) D  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary) C/ @7 S7 f# p9 U8 C! A
  set acceleration 0.099/ ^  I$ A, J! m) |+ C% H& L
end$ j& o" T7 n% P# j
" d# Y7 `$ t2 f% X" R
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,0 |  s8 T3 d" N1 e% W! P  S
;; and initialize the traffic lights to one setting
; e8 X" |: m7 b9 o8 Xto setup-patches
' C6 H0 y. v4 f% S7 v: c0 L  ;; initialize the patch-owned variables and color the patches to a base-color/ M* s8 v* ~( R: z* Y) |1 x3 C4 i/ x
  ask patches
  v# V7 s, }! {0 i& `  [
* |8 G1 e$ o' Y* T    set intersection? false' m, B" }+ s3 y, n7 g( f- w
    set auto? false
  O' ~' P$ J7 g3 `6 ^% }+ b3 W    set green-light-up? true
  s( u( p  U( u1 \& B    set my-row -1' d" S/ u/ J4 m6 r+ t/ \/ @
    set my-column -1
# F$ X( D! C* ?) [) _& ~    set my-phase -1+ e  ]# U/ S" ?
    set pcolor brown + 36 n  V4 S# \  d& Z4 D2 s' K
  ]) x4 s# s8 [5 i2 `7 t. E" @: b2 _
. F; w2 l; s" N& \- w1 O, e- Z9 V
  ;; initialize the global variables that hold patch agentsets" V+ ^3 H0 Y! N. ]
  set roads patches with
+ W9 o  q1 S8 e& T1 _9 v2 J    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! v9 D4 d9 e! }4 D' q% u/ Q, D
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 D# j: m) s7 d% M/ c  set intersections roads with/ e* K' P* C% [" W* c
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, U8 l8 K/ H( x! d+ w4 d
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# t/ R; [; ?+ M* A; m9 U

3 H/ V2 ^8 G  H3 }; n  ask roads [ set pcolor white ]" d5 a6 G) h1 @( ^
    setup-intersections* B2 E( b* @% P7 @8 }5 ~
end
$ S* |* [" j. J" ?其中定义道路的句子,如下所示,是什么意思啊?  H) f, \# w3 m0 [  n5 r
set roads patches with: |' M+ K9 U4 f' _+ m- S1 q& I
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: L- f0 ~+ ~5 L0 h  B" l; F* x8 V    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
7 r) t0 I, e7 ~& M+ ^8 P; y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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