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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。; q" p7 ]4 I& c) M
netlogo自带的social science--traffic grid这一例子当中,0 ^' a8 q9 m! V1 I2 t3 V
globals
5 M6 ~4 ], Z9 C: o[9 }0 e" W: |# [5 A" E
  grid-x-inc               ;; the amount of patches in between two roads in the x direction: ^4 J  n3 @0 t3 Z) ]0 ^" F
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
: b0 p# s8 N) @9 ]: w9 S( M  P  acceleration             ;; the constant that controls how much a car speeds up or slows down by if+ w4 a& n5 {5 q% u5 c
                           ;; it is to accelerate or decelerate
0 F3 P+ e) k, V5 }  phase                    ;; keeps track of the phase
- G% |6 ~, v+ I8 S- C  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure0 B! v2 m; S+ ?& H2 V
  current-light            ;; the currently selected light
; I; L; h# i! n8 h# P% ~, x
" ]0 n. j; y- F# D3 u  f  ;; patch agentsets
3 y  ]2 u8 ]+ _5 T5 T, a$ K  intersections ;; agentset containing the patches that are intersections# U& _+ s  O$ U7 [" U$ G1 z
  roads         ;; agentset containing the patches that are roads
- F+ x/ l, l: R! C]
8 y$ Z  Y; I4 U0 }6 ?  I% \' N5 U+ e) F- u! s4 O
turtles-own' [1 g0 w5 n' z
[" o( X: H. l4 f$ t5 ?; L, v: _
  speed     ;; the speed of the turtle8 B- R+ Y% |- W5 ]
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
* z* Y, S  J  V( ?  wait-time ;; the amount of time since the last time a turtle has moved% \3 C2 x) n- B  w4 t0 j$ X9 ]
]  }6 e% f  K7 E; G- m3 k
) ?+ k2 N5 T  ~6 |
patches-own
0 d1 @* G, ^5 n[
! u3 K' B6 C2 H% o5 s% p$ E# @  intersection?   ;; true if the patch is at the intersection of two roads- J" K7 F& w5 J! l! s$ q+ d0 ~
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
8 q, M0 u% M% V3 F8 M4 W0 z3 V                  ;; false for a non-intersection patches.& @6 Z7 l$ Q- u
  my-row          ;; the row of the intersection counting from the upper left corner of the6 C: S% W7 A, ^( N  {
                  ;; world.  -1 for non-intersection patches.
' j( X: t8 Y  J( T# x* @  my-column       ;; the column of the intersection counting from the upper left corner of the
7 m  u  ~9 }& R7 w+ p, G8 u                  ;; world.  -1 for non-intersection patches.! l: x' O" j4 I  L) a* z
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.$ b4 x3 ^9 ~& O# V; U7 y
  auto?           ;; whether or not this intersection will switch automatically.+ w$ |  m  D* Q4 q- z
                  ;; false for non-intersection patches.: {3 c: n& E" c* }# B! y) V) H
]
0 ]" x2 g: }$ v3 {' n! X& B! ^- h, _
9 X" S/ y! M: i( m
;;;;;;;;;;;;;;;;;;;;;;4 B" ^! {4 G! @( Z! X. X
;; Setup Procedures ;;
. u4 B* M& e5 v6 e" A6 `, M8 H; Q: d* f;;;;;;;;;;;;;;;;;;;;;;3 l0 h, ~5 r' G- j* P' I7 s* X! R* J" q
/ ]4 _! M+ M, C- ^/ z# q0 j" v2 U
;; Initialize the display by giving the global and patch variables initial values., b5 T2 G/ I, _
;; Create num-cars of turtles if there are enough road patches for one turtle to
& G- b% a7 F) L7 `. g;; be created per road patch. Set up the plots.3 o2 o6 e  q" B) Q
to setup: N( }8 p4 w! t+ d* }
  ca7 O4 l; J# [3 N% F: h. F; p
  setup-globals
9 c+ o: b+ p) a/ J7 t/ f9 U" a8 m+ R! H/ Y0 Q" F* i
  ;; First we ask the patches to draw themselves and set up a few variables
9 h( h5 h5 r2 y# x! A. l# ?  setup-patches% ~1 [0 S( \* i- \0 s
  make-current one-of intersections8 q' V+ t( @7 t9 @- h4 Q/ n6 \
  label-current
. p* R. W/ Y) P* m0 a; f$ ]" h0 _& l$ {! M" o$ a# h1 M
  set-default-shape turtles "car"7 h+ @" Y8 I' X% w& t

3 ]! n2 I* J1 e$ J5 O9 R, D  if (num-cars > count roads)
- b. R# o! H, o  [( z2 S7 `  y8 c% a# d0 [, O0 Y
    user-message (word "There are too many cars for the amount of "% J  E* x5 V; |
                       "road.  Either increase the amount of roads "
9 d( ~/ W/ ?/ A                       "by increasing the GRID-SIZE-X or "
0 d  `2 Z% i$ f) T0 n                       "GRID-SIZE-Y sliders, or decrease the "
  ~  ]) L. k. u                       "number of cars by lowering the NUMBER slider.\n"
7 D3 G. b' \( J- G0 L                       "The setup has stopped.")3 E7 P0 y7 m  |' p4 D
    stop
4 _, x4 {7 S7 D/ B0 d# d* p9 X  ]
8 P& \: J, e% O/ q6 e; L
. ~7 c0 {) z% \' Z, ^  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color# n6 u2 B. b* ^$ q
  crt num-cars5 W% I5 J  Z# d, Y8 k! F
  [% a2 [/ ~3 X. Q, M6 C4 Q( }
    setup-cars
5 u& O: l  |, {) V) A    set-car-color; E0 i, T9 Z3 h% w" h+ |
    record-data% v) _+ A% z+ E( ?4 n
  ]
! x4 U' f) p: g) u* d) R* C5 }
  \5 f/ g2 P/ \% j* ^" R  ;; give the turtles an initial speed9 c2 C1 O8 F% i! P( w/ j
  ask turtles [ set-car-speed ]
9 K3 x9 u5 Z5 R6 ]7 J; D& K+ f3 v- J/ M: w: r
  reset-ticks
2 s% n. L' I/ o- Gend+ M0 v1 i; q8 n$ F# J" V

9 e2 D. @- c; c+ \/ {1 @;; Initialize the global variables to appropriate values
$ z" }+ }/ |2 w" e% q' M' \. v3 `to setup-globals
3 N# n+ o/ H5 y, a. e2 U( \  set current-light nobody ;; just for now, since there are no lights yet
2 `/ Q% P0 J( l6 L  set phase 0' S9 U7 @9 S" D1 ?) ]3 q- V, d
  set num-cars-stopped 0: t% m# i% w- E7 ?( j
  set grid-x-inc world-width / grid-size-x
% J8 @) l' x3 |+ l& t) @3 H: Y0 M9 P  set grid-y-inc world-height / grid-size-y
0 p8 c( R# Y! R1 d/ x' v: T0 ?4 j% L  m+ n& j& f- L
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
  \# j6 Y: Z  ~  set acceleration 0.099
1 W1 }( p7 l$ y5 v5 x) i0 |end
" X2 B5 U4 f8 h1 C! Y
  N- o4 A0 x$ q% O;; Make the patches have appropriate colors, set up the roads and intersections agentsets,/ p' ]) Y; m% T4 C: B2 [
;; and initialize the traffic lights to one setting
& F" B& [9 i; w8 E. zto setup-patches
2 ~- N( f/ W" M' {  m  ;; initialize the patch-owned variables and color the patches to a base-color# H& _7 P7 P, [, c" {) S# D. q
  ask patches- t- @+ \" \, P
  [
- \# l' V6 y+ C3 f  R9 u    set intersection? false. n* H$ e+ [' H8 A! {5 e+ t9 Y2 a
    set auto? false" N5 Q: q7 f- y# s( C9 J- O
    set green-light-up? true2 n% Z/ O" g: m7 {5 x( W2 e
    set my-row -11 |/ z( i. ?) G% m, g9 Z2 G- J
    set my-column -18 O% g) {7 D* Y4 h: y! f
    set my-phase -1
8 r7 Q/ X+ v3 X% U    set pcolor brown + 3
* K0 \. M: v7 t5 K  ]
4 E( m7 G8 K4 S0 C
5 s5 p) W  y  m. ^  e  ;; initialize the global variables that hold patch agentsets3 K0 O4 X0 Q. s! b+ b+ k3 m/ B0 P
  set roads patches with
" _2 A, l+ F% n9 J5 [. G* Y2 K    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or* W0 _& s5 F7 S9 |( ^" W
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! `1 ^, x) b  d1 {$ A
  set intersections roads with
7 E' e- l8 F1 [+ G9 e4 n    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and8 i. f! G0 u  g; n
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, }' `& [4 ]9 U- _$ B0 h6 J
/ u6 G1 Z6 }) f  z- n2 Q/ H  ask roads [ set pcolor white ]
  O6 ^6 l8 Q! y" \/ g: X8 Z3 {: e$ c    setup-intersections$ k8 c8 x1 z2 C) M% @, T
end2 i. V. ?9 p- A* W9 A: k
其中定义道路的句子,如下所示,是什么意思啊?2 x/ L. d0 X- n% I
set roads patches with
. E& q! r1 c; b    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' ?- H, ~% m- N+ R  b+ l) \    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. m" h" k: o3 E+ q8 x# |6 N3 Y- W+ M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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