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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。; \/ C) ]6 }. F/ f% X& Z' K" Y+ T
netlogo自带的social science--traffic grid这一例子当中,
& G2 p; q: @! _/ k3 |- C* }+ Aglobals
8 u7 {9 l) A# r; x' h) V" w3 z7 ^[( f$ i) l) N; Q0 }! L
  grid-x-inc               ;; the amount of patches in between two roads in the x direction4 Q7 c. e4 H6 R5 f- N* U
  grid-y-inc               ;; the amount of patches in between two roads in the y direction- u# |( d- U- ^0 s, O
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if, m6 J4 r8 u; j
                           ;; it is to accelerate or decelerate: ~& R. |8 {# l8 l% {
  phase                    ;; keeps track of the phase/ ^  @1 [6 H3 ]+ Y7 g
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure+ A9 U* w" S+ n, }6 g
  current-light            ;; the currently selected light" ~% j" l5 ~) c9 r

, ?) @5 Z) s9 z1 a2 p. N$ X  ;; patch agentsets
" u1 Y( y' y' h, P4 K7 K  intersections ;; agentset containing the patches that are intersections
1 y9 K  o0 j# p, g& z9 F  roads         ;; agentset containing the patches that are roads' ]2 N( i0 G7 |
]0 B, I7 V) A) C9 g6 _

, z  _% P" D. d: Sturtles-own
3 L7 k2 @- ?8 s3 @[
" ~9 ^1 w* S& `2 j  speed     ;; the speed of the turtle
9 b) B6 D! o7 U& f0 k9 V  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
# q, b. v% Z2 h+ d* W  wait-time ;; the amount of time since the last time a turtle has moved  q. }8 ?5 R; _! X5 s% j
]
, a! }2 n4 c% }2 ~
  n* v! g' P0 E& H% ]patches-own1 _) |0 ~* j  Z" T  _) Z" ~
[
4 v" ?- A3 t( ^. j0 l/ }# @  intersection?   ;; true if the patch is at the intersection of two roads
; [6 H2 D+ {8 |4 d- _5 u3 q# y  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
7 F& Y& _4 c) k; Q7 Y- j# f/ v* i7 _                  ;; false for a non-intersection patches.1 K8 O( M- g3 K/ R! e
  my-row          ;; the row of the intersection counting from the upper left corner of the+ V- K1 C% K! b% o5 p) ?
                  ;; world.  -1 for non-intersection patches.
! t, V) W# G9 }2 i. ]% X  my-column       ;; the column of the intersection counting from the upper left corner of the* v0 T0 i( o" S1 U; Q% ~2 u0 X! W) c
                  ;; world.  -1 for non-intersection patches.
# A% P9 E3 x+ s# q" J8 P4 U4 Y  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.' P" i7 K7 q, w5 }4 Y; [2 `; K
  auto?           ;; whether or not this intersection will switch automatically.
1 H2 b9 {+ O) c3 j7 t: [                  ;; false for non-intersection patches.
) P" l6 S0 C; }, p]' |8 Q& c/ s; b6 _, H8 |

$ c$ c) o  ]( F' @- I
( a0 Q! c( A1 |! E0 _8 s;;;;;;;;;;;;;;;;;;;;;;
8 F& Y. ^! y2 L. ];; Setup Procedures ;;
, V8 ^5 e: `- I; i1 K# w. \% Q/ h, ^;;;;;;;;;;;;;;;;;;;;;;1 n' w9 @7 y. k' q; n/ ]
# @/ I* P- @/ G3 x
;; Initialize the display by giving the global and patch variables initial values.# t. B: p4 {1 i, v6 U
;; Create num-cars of turtles if there are enough road patches for one turtle to
2 q/ P7 f( P/ h3 X, C;; be created per road patch. Set up the plots.
& S- G& u9 ^6 n5 J* Rto setup' U1 [6 m: E. |7 J* \& i8 Z# M
  ca% I2 k" {! t' x/ Z0 P3 I$ {, l
  setup-globals
+ {, J) a" B" Q6 h! k6 a# X5 `5 w6 b2 {; C* J
  ;; First we ask the patches to draw themselves and set up a few variables! S) V0 y3 V  Y; a
  setup-patches
. A* e& E4 R$ ]- j& G3 h6 V  h% j1 C5 i  make-current one-of intersections% x% l2 A" q) m1 H: e3 X! a
  label-current
# Q: S. G9 K9 y
0 W* s9 S6 F1 o  set-default-shape turtles "car". ]: ?; l# W- ~) R3 D

+ [- O+ M0 l) T0 T. a  if (num-cars > count roads)0 b1 {+ l* M( `: V: J7 h
  [+ g/ P6 W  M( a6 N3 ^9 t
    user-message (word "There are too many cars for the amount of "
( x. h. I$ X) u7 A, }' n, Q) d                       "road.  Either increase the amount of roads "& o: |6 {. G$ R/ M2 K: S7 u; h
                       "by increasing the GRID-SIZE-X or "
; B8 \! r/ E% [' |" P/ ]" U                       "GRID-SIZE-Y sliders, or decrease the "
; n+ ]+ @, i' b  F# C                       "number of cars by lowering the NUMBER slider.\n"
  e& S. W2 x8 P                       "The setup has stopped.")
! h" Y8 v+ A4 N    stop$ J9 o( f8 `1 U6 V! A
  ]9 y+ E: i, ~6 S- e
1 f- |  O: ^; X; _
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
; [" J* r/ V9 B  crt num-cars0 g- p  M# ]: m& }1 n5 N9 g
  [
( w  N9 L: r, U& x    setup-cars5 S' H+ T. {, t( z! Z2 K# k5 y( _
    set-car-color+ O! e! L  Q' m8 P& M1 M2 O  G
    record-data
( K" p$ h$ s# {, O; X  ]1 j; _0 J, Y+ k, U

# T) W) n' V$ \7 h: k4 N  ;; give the turtles an initial speed
/ |* _. z1 M2 ~! Q! K$ Z7 V0 F  ask turtles [ set-car-speed ]6 @6 J# w- H" }

; ]' j$ j( O1 J4 @" k  reset-ticks3 |* h. B$ b8 t1 G
end
! M& Y% \/ H3 ^' w
8 |# @( B  [0 e5 h* d) x7 [4 |3 v;; Initialize the global variables to appropriate values
& o$ ^) q8 u, x7 z* Uto setup-globals' ^+ ?. z9 f% o2 t9 j* L2 F- J( ~# W4 [
  set current-light nobody ;; just for now, since there are no lights yet
$ I2 s" F6 t, D3 J/ C  set phase 0
/ T& K6 W9 Q9 q' D, C+ J  set num-cars-stopped 01 |+ I+ |+ k- Z
  set grid-x-inc world-width / grid-size-x8 f1 A; i3 [  `/ W( Y" c
  set grid-y-inc world-height / grid-size-y, d; U" E! R; e1 Z: w  s1 y

- c2 k1 j* D6 U/ R+ h3 J" O* U; o  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
) {" W# i* a9 X9 c9 J$ L- P; q- Q  set acceleration 0.099
0 @/ |. n) e( U( rend
1 [9 s. H! _) K0 E7 q0 M& F, q* D) t5 J) \0 v7 Z
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
8 g0 A/ _, b6 y;; and initialize the traffic lights to one setting
( D& c& }6 v- M3 m0 cto setup-patches
5 B/ [8 P0 n1 d2 J3 C& H3 I- S  ;; initialize the patch-owned variables and color the patches to a base-color: G% p; S  e. Q
  ask patches
" f8 s* M. c$ e  ~) {. h/ m+ p  [0 j' @1 G5 B1 W: R2 C
    set intersection? false6 s) x# u, o7 W
    set auto? false5 z1 X+ N9 i3 {1 M4 M' g
    set green-light-up? true
) o( z  i3 L2 Q3 y: V1 p    set my-row -1# S0 i% ~; c* W8 h+ b: H' E
    set my-column -1# @' \2 M* E" l% x  O, M
    set my-phase -1# A6 b6 L. X. d5 U7 P* p' Z
    set pcolor brown + 3$ x, m4 S$ @) n. W
  ]
+ j% X: S7 z  q* \/ d
7 p! q1 S6 f5 v  ;; initialize the global variables that hold patch agentsets
/ ]4 y) c% g- v. `: Q! B  set roads patches with6 H- G6 U# Z5 n( Z+ W9 V. b
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% O8 O7 H% ^( y0 B; D( s4 [    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% Y1 m0 G( W4 X4 _5 O  set intersections roads with5 R* U% E6 p& ^* Z6 k) V
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, z( _' R; j) G- f5 c
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. a% L  ]# o+ G8 A
' t: C: h, F' c; j6 n$ Z  ask roads [ set pcolor white ]; e/ |7 H0 ?! S6 l) [  v, g
    setup-intersections
# O& X& C9 ~( K  f. tend! D. M8 x) W6 D( x, e. A6 F: [
其中定义道路的句子,如下所示,是什么意思啊?
% q5 Z% f- u* S2 N) G8 z set roads patches with
% Z$ M& R  ?, l, S7 O  [) g. v4 x$ O    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 }, w: x7 p" V; k# f
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* W% C( F1 c# x& w* O2 k9 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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