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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 g) i; o& cnetlogo自带的social science--traffic grid这一例子当中,0 r$ K0 Z, n3 x8 O" v8 \
globals
3 b: J# |. [/ N. J! i[, @$ O- o1 {! j2 F  b3 T$ X
  grid-x-inc               ;; the amount of patches in between two roads in the x direction. j! |7 l4 ~. ]0 l
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
( j1 B9 N+ |1 Y3 b% s2 B" q  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
9 N- S" u. Z0 h3 s5 w# U1 j# P                           ;; it is to accelerate or decelerate: x0 W. ?# ~) Z( ^% V4 a( @
  phase                    ;; keeps track of the phase3 d/ Y' Z$ I# p) ^7 n5 N
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure8 ?7 R1 r5 V' b# f
  current-light            ;; the currently selected light
: X& l0 q/ Q; X5 |& k
1 Y  L2 i1 L0 e  ;; patch agentsets
( {1 J1 e7 q3 c: o  intersections ;; agentset containing the patches that are intersections
" ~; `7 C& \  N! A6 t' }- `  roads         ;; agentset containing the patches that are roads  s; R- K( T" z
]
5 q# L0 Y9 X0 f) o* b: s
& p1 }( a' C- sturtles-own! ^* U' M; Q" c% M
[
* h7 s. J  B! w8 f" e$ q  speed     ;; the speed of the turtle- i0 u+ P3 ^! A5 _2 G
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right) T& C" t( r6 W1 u
  wait-time ;; the amount of time since the last time a turtle has moved
1 ~: f  w3 w1 e0 e9 g1 a. y( v]
& \2 X) b$ I* y* ~/ X
/ L4 k/ j; `7 Qpatches-own
' O2 T+ d# g& p; x[
6 E6 ~1 R( H/ m* l0 I  intersection?   ;; true if the patch is at the intersection of two roads; z5 D4 |* E( N& Z' B) b
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.  b( ?$ h6 g4 f' O
                  ;; false for a non-intersection patches.1 A& {$ C: @3 j- F# \, ]
  my-row          ;; the row of the intersection counting from the upper left corner of the" s" F3 U7 G- d; a% C
                  ;; world.  -1 for non-intersection patches.( W; e# @+ u4 }; Z# v
  my-column       ;; the column of the intersection counting from the upper left corner of the. j, h9 X; j+ a/ x( A
                  ;; world.  -1 for non-intersection patches.: Y% ^) L9 }8 B& y7 ?. v, z2 Z
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.; [3 q( f5 i$ e! D% m
  auto?           ;; whether or not this intersection will switch automatically.; \' |2 d3 v+ J! }7 J- F5 x
                  ;; false for non-intersection patches.* s5 ?+ g% D) ^; \$ R- I
]
, a" k# [: D: `. N0 j# A: Q7 q8 g% w/ A3 C& a" x0 W& n5 h

  Y) v3 c* L2 N;;;;;;;;;;;;;;;;;;;;;;
* N2 U8 B4 \( P) a3 D& ];; Setup Procedures ;;6 D, z" r/ V. w3 e6 D  r$ E
;;;;;;;;;;;;;;;;;;;;;;! [* F8 e! k7 Y7 B+ e8 ]
! k' y9 s# I/ ^
;; Initialize the display by giving the global and patch variables initial values.
2 l  d, f9 j4 A9 ?6 t4 c" };; Create num-cars of turtles if there are enough road patches for one turtle to* o% N' S, O" S' @
;; be created per road patch. Set up the plots.
2 m- L, U0 l) m4 ^$ Rto setup
2 s  U# N% t2 h. l- N% c  ca2 M. e) G& R: l7 S
  setup-globals- t% f6 {0 c; n4 Z1 s
& T. k, J# |" k" m+ r: t+ ^( ^; c
  ;; First we ask the patches to draw themselves and set up a few variables
5 L2 u* L6 {( W2 l  setup-patches
& ]2 g2 m4 j" W4 a3 ^9 u1 |  v3 a  make-current one-of intersections# E3 {5 v) C$ D; G' B7 o
  label-current/ h9 }  @( ^% l2 S1 w2 g- d2 x) b3 _

/ ^5 A6 H% H3 b. Q  set-default-shape turtles "car"$ t; T0 `5 [4 F9 F! u( h9 G7 i, d

- d5 C' z+ O; x; x; F/ x8 z  if (num-cars > count roads)8 G# o$ [( L& R! Q2 A
  [
' E$ _4 H) }3 \0 p  w    user-message (word "There are too many cars for the amount of "3 k6 o; G- @1 b" J6 V6 }
                       "road.  Either increase the amount of roads "/ n; ?) M1 ]: g4 s
                       "by increasing the GRID-SIZE-X or ": x! ]& O/ H. x' k: W
                       "GRID-SIZE-Y sliders, or decrease the "! l4 Q3 E# d" C- {4 o5 _
                       "number of cars by lowering the NUMBER slider.\n"
3 A* O. i- D& I" C                       "The setup has stopped.")$ |0 D7 F$ S5 }1 Z, x+ M2 A1 }
    stop
$ Y2 D' c4 [) r" a# L7 Q6 V5 f  ]
0 \7 f! ?/ d* n. h3 T. f/ e0 h
  t/ |8 N! G: ~  b# ]2 P  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color' K. Z- w$ b: V0 p0 T" Q
  crt num-cars
" S: d- K  F3 e9 c& e$ l, v7 S& W  [
+ `2 D1 Z1 M4 u8 R" j    setup-cars
/ ]8 {4 w5 d4 ^- ]6 o0 J  p3 _& [    set-car-color. K; @; c0 Z* `0 g
    record-data
* P( Q" X% A7 G* A7 V- [' d  ]
, v9 V+ Q7 X8 D3 d( U7 {/ a: s; W* _: n" I" e5 w3 ^( a8 D2 o! d3 }3 k
  ;; give the turtles an initial speed! c5 T. c, I$ z: D9 A3 }% U  h
  ask turtles [ set-car-speed ]1 a7 M3 u5 ~0 U: k
% V8 l% s# b( i- t
  reset-ticks
" y+ a; v9 n7 b' D. wend
; O( c, E; _* e4 y# V. K5 W6 @; h' ?8 H
;; Initialize the global variables to appropriate values+ T& L7 Z6 U) C% k1 q
to setup-globals( G& L& n( F% K! y# L9 }+ c
  set current-light nobody ;; just for now, since there are no lights yet" b) E4 E' ~) {4 i  v# A
  set phase 0
$ {" v! h0 R- x  p6 U' A% l  set num-cars-stopped 0" e! \$ Z( E- T! |( J
  set grid-x-inc world-width / grid-size-x0 B/ ^/ p! z: W% t& u3 b6 v* e
  set grid-y-inc world-height / grid-size-y+ z) ^  n" P7 u: H6 T0 V3 `
1 {: P& ~: m) ^! l) D+ I+ P
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary3 D4 m4 p: I" L5 E  m  ^
  set acceleration 0.0990 ?- |$ e/ R& D& O! ^
end
4 g# s& \3 _  I! e7 E3 `; l8 b! l9 j+ q
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
6 ]; n  O% X( L; O9 W;; and initialize the traffic lights to one setting, K, D  ]4 p; @: K% q, d+ _
to setup-patches
/ ~! t5 d& ]+ R0 [* K1 Q- x  ;; initialize the patch-owned variables and color the patches to a base-color
& m7 `' R  n+ }& U# V  ask patches
5 G3 h. B0 q7 ~% I  [4 ~2 m0 w8 @9 p" W" X! e+ W" `
    set intersection? false: R- E. A0 s! }& i1 s
    set auto? false
" o' K- T4 c1 j8 C    set green-light-up? true
0 u$ N4 e" D0 t6 I7 J' w    set my-row -1- a* Z3 B" Z' L& q0 L& v
    set my-column -14 F, R6 s& X9 I4 g3 K7 x4 ?& D
    set my-phase -1
: T5 l5 e( }  Y" m  M+ i    set pcolor brown + 3  L, A! j+ {( z) p7 P  ?
  ]& P1 S( P" y1 x! m

; S& x# z+ u& p' G. Q. Z  ;; initialize the global variables that hold patch agentsets
4 Z. X2 A/ z6 h  H) o  set roads patches with/ ^/ {6 |2 H. J  o
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 E- v0 u! a  K# m$ M2 @+ l! u    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* o6 e$ g& ?3 _7 K( p, u
  set intersections roads with' O( f0 J2 m2 c; X6 a# O9 z. R4 W+ ]5 j
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
- q% A7 H4 M, i; o    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; I* |1 E7 j) y$ c2 B) d
$ z* A+ h6 ?( a6 x$ }# W
  ask roads [ set pcolor white ]
" R5 }: A( E% P, T3 l    setup-intersections4 A& B4 O! @. a9 M
end$ a- g7 C. ]: F7 J
其中定义道路的句子,如下所示,是什么意思啊?
! }$ H  J$ R# l; I- T9 a- g set roads patches with
7 }7 @( S& P5 q- Z; Z+ z# o2 f    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% l: k& H1 R2 t# Z$ d. X8 S
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]% Y: {; {$ b9 U! o9 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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