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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。
9 F8 v1 _, e/ A: e% D; C4 `4 Bnetlogo自带的social science--traffic grid这一例子当中,& m4 ]0 J- x+ X- `6 U
globals
# R) r# Q* [1 F# ~[8 u7 Z/ X0 O  Y) _4 M
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
* R8 c. e5 ]0 s$ e- B) o  grid-y-inc               ;; the amount of patches in between two roads in the y direction" L4 ?. d. j* R6 y2 U3 n9 D
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
: W7 Y2 {8 z* U4 {( D9 H' M8 {$ W                           ;; it is to accelerate or decelerate
7 o' ]7 ~; p! l& U5 [2 [( t! _  phase                    ;; keeps track of the phase( e' n* O3 G) p+ I! _- E' ~; F
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
# b; A- Y% \2 w% [8 ^  current-light            ;; the currently selected light5 m- t5 h5 p$ a% }; f

1 C1 `& C& f8 z6 c  ;; patch agentsets
6 [$ B0 w, p  M0 C* |& @$ ]$ L  intersections ;; agentset containing the patches that are intersections+ }- }6 ~4 r" \2 j- D" m3 |
  roads         ;; agentset containing the patches that are roads* p) o2 Z- y3 f3 _
]
. {- R8 j3 F" F. V6 C& f* ^$ E- S. i1 e& p$ O
turtles-own' v1 ]/ p: g' v# L5 P3 e
[* o. W8 ~6 ^2 ]" c) p4 h3 d+ q
  speed     ;; the speed of the turtle- X0 A' s4 d% o/ W. h7 y! y
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
, H6 _/ b( u2 \; P" q  wait-time ;; the amount of time since the last time a turtle has moved' i4 l  }: i8 M( V2 L5 q
]
( e- R: r' p. j3 k" ?5 X2 z2 n/ ]! ?  n* F0 `  j  _
patches-own
3 k' g8 N( `9 u; S[; g( `1 Y9 h$ K
  intersection?   ;; true if the patch is at the intersection of two roads
0 {' a# ?1 l; @0 c4 j  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
) A) m$ E: @9 N( A: U9 Z! |6 n0 d0 `9 V                  ;; false for a non-intersection patches.
! c# {% W* u1 i5 j3 a2 w  my-row          ;; the row of the intersection counting from the upper left corner of the
/ q. P7 T* k. C, e                  ;; world.  -1 for non-intersection patches.4 _' w) w& K) I& {  e
  my-column       ;; the column of the intersection counting from the upper left corner of the% X8 E& `5 x9 f% y3 x/ |" V! j; b3 k) Z
                  ;; world.  -1 for non-intersection patches.
, a6 U# c) N! o6 b5 E- o  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.2 V& d: g* N  ~" X) o  @5 g6 T
  auto?           ;; whether or not this intersection will switch automatically./ A7 j# l4 c+ p0 x1 Z
                  ;; false for non-intersection patches.* ]; I$ x# n( V# O. ~4 `. Q* E3 B
]
. ~7 C/ C  N' y# g
/ ]/ g1 w" G; m% B7 T- |
4 j* Y5 g4 ^% b' x;;;;;;;;;;;;;;;;;;;;;;- j1 ]/ ], O: r% W( V
;; Setup Procedures ;;. Z# ]. O5 P7 s$ C( c3 r
;;;;;;;;;;;;;;;;;;;;;;8 ]( S4 m( M& A, P: W9 ~- a$ L. h
! G3 j7 Q2 l# H7 T
;; Initialize the display by giving the global and patch variables initial values.
  ~$ }; I3 R7 ~! U! _;; Create num-cars of turtles if there are enough road patches for one turtle to5 k0 `9 v) V6 F! n
;; be created per road patch. Set up the plots.& O* b0 y& v$ F1 f( p
to setup5 B$ ^/ d" Q% d, v5 ]4 d
  ca  ?( V# F/ w, l- w0 Y3 r: m7 \
  setup-globals
3 u2 U( ?4 R/ D: D8 b, T
  ~" q+ K) i& X! i/ T  ;; First we ask the patches to draw themselves and set up a few variables9 X/ Q- c* ^# R0 \0 E; V5 Z; p' X2 N
  setup-patches. F, t( E- X, X9 `" @5 [# i9 W! q
  make-current one-of intersections
6 ?* T! J/ j9 T5 v- d  label-current( @$ @. H% _  g
8 E9 K- `4 U( u- @
  set-default-shape turtles "car"
1 ~1 R! j% w' H
9 c! n1 I6 X$ L0 Q5 m3 y  if (num-cars > count roads)
) B2 |* L1 v8 [! e8 A2 V% e- L  [- m; l4 }$ H2 h
    user-message (word "There are too many cars for the amount of "
2 ~9 k, H) }: a" `2 U& o: ]8 Q7 T                       "road.  Either increase the amount of roads "
+ |1 }& V( ]# |4 }5 d                       "by increasing the GRID-SIZE-X or "* m! ~: K/ `2 W# @9 R/ r" l: ^2 e* \
                       "GRID-SIZE-Y sliders, or decrease the ". y/ y2 [. r: T9 S1 B8 a! R4 s+ h
                       "number of cars by lowering the NUMBER slider.\n"1 n9 \" ^8 @% T4 \6 k) C! T. A
                       "The setup has stopped.")) F( Z! k6 k4 T( {9 s
    stop
2 p4 ~, H, E2 D0 C5 n$ |9 {  ]
" p9 C5 o* d; [; S% V1 z  H. O. _$ W" [9 I' g/ a
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color& F" q* w& C% ~5 x$ s: M% ]; q
  crt num-cars
1 u  i! r9 ^1 b8 i# I& n% y. s# g  [
6 U) `- Z2 C; {# u# m    setup-cars
6 ]7 F# t( x' V    set-car-color  L5 p; q4 E  D' m
    record-data
! j: @6 I8 c% a/ T. A: R; D/ S) s$ }  ]& r$ O! V6 {, y( r: R
8 `5 K3 i1 r7 C, w$ A+ T+ C1 D! B
  ;; give the turtles an initial speed
, s1 u7 Y% `6 j- S5 D* o% c( A  @6 V5 B  ask turtles [ set-car-speed ]" v0 `/ a+ m( c- ]
5 {6 Q; X& J5 \( k% |
  reset-ticks, K3 N3 n- R' D7 h2 L
end
2 G0 n  \- Q6 z' I6 R' {' `% h! r+ u, q/ w
;; Initialize the global variables to appropriate values
- `7 p8 f9 s; ^3 y% j, Xto setup-globals
- o4 B' }1 j  f& }; W2 ^; d  set current-light nobody ;; just for now, since there are no lights yet) I" P4 h/ ?1 x, D. _
  set phase 0
1 q1 g& N. e* L  set num-cars-stopped 03 Y' z2 s+ }) l9 |
  set grid-x-inc world-width / grid-size-x
4 t( ^( ~+ [; t( W1 P, F# [  set grid-y-inc world-height / grid-size-y5 F" G) f8 |+ l/ t1 X8 g

# I$ F/ [+ P5 x" T  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
7 v. w. U2 c6 h! `9 x- @5 g) A# Q  set acceleration 0.099
& v! G/ x- @$ ~2 \9 ]end) o0 a! p: W, K
5 \+ K. v* h0 T& d# C# ?8 D! Y) e
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
- M, D& z- @# m1 S;; and initialize the traffic lights to one setting
. n- }. T) b% R. ^( M' _- e1 r; L/ {to setup-patches1 e4 ]6 j& u' R; H8 \' w
  ;; initialize the patch-owned variables and color the patches to a base-color
: B: g, X9 B/ t8 {6 V* N  ask patches
! _0 ~$ \7 o% Y+ D' ]  [
. g' ~9 B# Z4 N( W' M    set intersection? false
$ u$ L# T  x- l4 b% m    set auto? false
% ~& \* |0 r; D7 @) j% ^: v, j    set green-light-up? true; w/ R# D3 c3 d
    set my-row -1% x7 M4 ~' Z. ^9 y
    set my-column -1- a4 D; U+ C, [* ^% t2 V
    set my-phase -1. B/ W* _0 Q& v+ v( a
    set pcolor brown + 3# l4 ~* ?3 G' k- v! E
  ]  J8 b2 [- a8 n8 P8 G
8 z! u8 ]7 W8 J& j& Z* L
  ;; initialize the global variables that hold patch agentsets
2 @( N/ t3 ?. D8 F" o  set roads patches with
" K, J7 e8 A8 P9 N# f" P% `    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 z" r! ]  T3 h3 _" v; j: D+ r    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 p2 E" p3 q( H$ R; {6 R$ O  set intersections roads with  c! ]: W4 J5 z
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and' L1 z7 g2 z* t  F! J
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 |' v/ p+ Z% `; B- M$ U; j" o9 V
, z  F8 [3 p9 [9 X1 G8 B  ~  ask roads [ set pcolor white ]: y3 P! L/ @% J  K: n6 r
    setup-intersections4 U- S: n0 T' k! t
end
' ^0 Z: }( f, W# v" i4 C其中定义道路的句子,如下所示,是什么意思啊?
. C4 S) T8 j* j% @5 H! b: K set roads patches with
. E0 A9 j2 e; s    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
( ?! W" r* X+ U5 {    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 _# z9 g+ X- 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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