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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。
; k+ y, f0 E5 e# }. Qnetlogo自带的social science--traffic grid这一例子当中,
  Y( q- R. }9 u  z: F) `( Gglobals1 q  l/ q- T9 D; p  i
[: p& U/ k+ p2 O- e0 U; _5 s
  grid-x-inc               ;; the amount of patches in between two roads in the x direction* E4 S* P- P, t, O! `+ i3 U
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
  N& m8 `7 v4 v* p' s# d' X% K1 X  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
3 V. u# g* a1 `. `% v                           ;; it is to accelerate or decelerate. T4 M8 h; C( T; g
  phase                    ;; keeps track of the phase
% ?' b: e/ s1 `5 w  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure( \$ ^, r. b' ]' `
  current-light            ;; the currently selected light
! }4 Z6 V9 f- ]8 I  E/ h( z+ w
+ e% j# Q4 Z* L7 l$ F; L) P  ;; patch agentsets
' t+ b: u  P8 h! D3 I' L& c  intersections ;; agentset containing the patches that are intersections
  d* m& m0 u/ `4 V$ p  roads         ;; agentset containing the patches that are roads
- a4 T: W* L$ [( ^; C) j4 t5 Q]
3 U% A* A4 m/ r, ]# X- \
0 j$ z. e, z2 u+ k6 J. }turtles-own
" b9 X; O" B9 U3 v& J- I& r$ m[
7 U/ D- |9 s3 l  speed     ;; the speed of the turtle/ `# k% t- c8 @* i- n; D
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right+ G) {2 I5 r' a! [5 z; H8 O9 ]
  wait-time ;; the amount of time since the last time a turtle has moved; }- W* |: O  D* p" S* d
]/ c/ l8 |+ g& ~  W7 A- M; F

6 n# I( K6 u- a; w9 K; Kpatches-own
1 X; Z! X1 T6 I& H2 _/ _[/ M. S  o% h) S
  intersection?   ;; true if the patch is at the intersection of two roads
! \# J# {, n; F3 m; F  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
! P/ k# W# E3 j/ Q                  ;; false for a non-intersection patches.) |: t. S' ^+ I0 w0 H: d" v" Y0 ~+ ]
  my-row          ;; the row of the intersection counting from the upper left corner of the
9 R* U0 R1 R" N; A7 O- E$ b+ n; W" l                  ;; world.  -1 for non-intersection patches.* R" K5 \  v# Y: c+ m8 C
  my-column       ;; the column of the intersection counting from the upper left corner of the
& h8 H% _9 ?2 ]: z                  ;; world.  -1 for non-intersection patches.* c& t' s: t# p" z. z' C
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.' U" L2 ~2 Y9 Z+ v# k7 |7 Y) k, v
  auto?           ;; whether or not this intersection will switch automatically.
* I9 ~% H- O$ k# [; n  O                  ;; false for non-intersection patches.
# c" c; ~8 Y: B]  k/ q5 J6 I, k& H5 I

$ t# E; ?# ?9 W4 j9 b5 j) U3 ~  f- s; Y0 y
;;;;;;;;;;;;;;;;;;;;;;4 P8 k( r- W/ j* m3 M6 ?
;; Setup Procedures ;;( K+ ]& O& X8 f+ L. z8 n
;;;;;;;;;;;;;;;;;;;;;;
+ k. q+ e! m2 J+ R' I3 ]9 o( f, E5 ?4 j2 C3 ]6 V/ S! t8 H4 R
;; Initialize the display by giving the global and patch variables initial values.) t& y0 N. N7 t$ b4 p6 y& M2 `- N
;; Create num-cars of turtles if there are enough road patches for one turtle to% n* ?/ z' @9 g" o
;; be created per road patch. Set up the plots.
6 `; U0 v1 n6 U4 Y6 \to setup6 v# R) t9 F# v. k, q9 l
  ca
* o+ i$ {- c  [, a+ c  setup-globals
, a6 V5 M0 N+ ~* M1 Z
2 O' H" Z& d2 w2 S' y. o  ;; First we ask the patches to draw themselves and set up a few variables
( \  l; E# J% ~  setup-patches! s! X+ V2 ?# o, ^8 u
  make-current one-of intersections6 j  h# q" d1 P7 k
  label-current
) h5 \) [( t8 o* Z  E
, }- n. _1 w( B1 ?, C7 y  set-default-shape turtles "car"9 D7 a  Z! e% d2 [9 _9 c  X. _
( I2 a4 R- `. x+ }
  if (num-cars > count roads)+ n  V+ B" w* Z  Y5 A& T- R
  [7 z! s. C  Q3 R/ ]: P- @
    user-message (word "There are too many cars for the amount of "  A: m( E' a* S$ O$ x4 ]; a
                       "road.  Either increase the amount of roads "
4 L- X4 q( B6 z# l3 w$ z+ K1 T: d                       "by increasing the GRID-SIZE-X or ") m* ]4 K/ U  k0 y+ n& l
                       "GRID-SIZE-Y sliders, or decrease the "
0 `2 W" S5 E0 D/ H* e- `) `$ K                       "number of cars by lowering the NUMBER slider.\n"( U7 M' J8 |' [9 M! R. C! J2 b
                       "The setup has stopped.")
% V( L- B' Z: Z$ `% x9 X6 Q$ s( X9 S' l    stop3 `2 {9 d$ B' h4 c  W  Y- k8 Z6 e
  ], T% A* M0 F9 b  R

: \8 t' ~/ h! ?2 u  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
! s+ f: N6 P; I6 {8 _  crt num-cars
# ?! \! O' h$ r8 f& q  [& G0 B) B9 Z6 ^
    setup-cars
* Y; _. Q" _) g! I6 L" o# ]    set-car-color, X0 r4 l: [1 a( G4 o
    record-data$ \$ y1 G0 s3 B& ~* S7 [6 u# l
  ]
6 O, a+ |% D" |3 P7 e  I* C9 S1 U6 {0 y
% m2 H. I, N. w9 @: x; c( H" a+ u  ;; give the turtles an initial speed
. c9 S+ @0 R0 |5 ?; I+ d- V) B; M  ask turtles [ set-car-speed ]
: U# H1 t! ]' @/ S9 g8 w0 P/ D7 p5 ?. r5 o5 y
  reset-ticks
5 D5 L& g, N, j' z6 Cend# F. S; O5 H  Q! V4 j

) p& n9 n/ t% }% K! I;; Initialize the global variables to appropriate values! C4 X' \0 H" r, E) \
to setup-globals! b2 u4 l" }# u$ p7 c
  set current-light nobody ;; just for now, since there are no lights yet
0 _" W: i- `+ \' h  set phase 0
* J' y* N8 c/ l0 \; b; |  set num-cars-stopped 05 K; }* X) Q; n: c) A/ i9 P
  set grid-x-inc world-width / grid-size-x
' W% d' Z$ T" q9 ~/ n  set grid-y-inc world-height / grid-size-y
5 W9 f+ h. `% `# E! B, Z5 C5 Y8 T" F/ h* M6 Y
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary% y+ s! K7 }- S5 @; `7 d; w8 {
  set acceleration 0.099
' L$ P3 V; r3 B5 z+ ^/ e9 Y# V2 yend
# _% o' F' ]* e4 [4 r! `# o6 Z& u- R  |! M4 h
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
7 c5 A2 p! a5 \8 |/ ~( e2 U;; and initialize the traffic lights to one setting
3 U3 |- Q: t& U8 K  gto setup-patches
+ p2 a" \- G, g. k. v  ;; initialize the patch-owned variables and color the patches to a base-color6 Q2 l1 J5 B: l$ l
  ask patches5 u+ b" z' s& m# n( ]
  [& H0 h& }# E( P6 O6 i( y
    set intersection? false
0 ]# S3 h. q2 B1 }+ u    set auto? false1 u, q. y' v: c' q3 \
    set green-light-up? true
. u1 k6 A/ N: ^# B8 z    set my-row -1: U8 c3 V/ X/ C" H/ s
    set my-column -18 f& {( g% p8 x4 F2 [" k
    set my-phase -10 p! o+ M/ V; ]( ~  t: \9 ~& E* ]
    set pcolor brown + 34 `4 e/ h( _. f) _5 F$ Q, k
  ]. s* W) r8 X) T5 I2 c
4 I) x( |8 Z$ N' r2 T
  ;; initialize the global variables that hold patch agentsets& S% Z5 ]  X5 J8 c7 T0 H# V
  set roads patches with2 o  _- ?: I: t4 J) S; k1 S6 ]9 V
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 k) a. d7 W, H/ A% N6 X; ~    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, z2 |6 w2 T9 |; J0 K) n  set intersections roads with: u: ~# j. F% l4 w6 X+ ?4 U
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
, W6 j/ B, s3 L) I8 b$ Q    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* J/ K" }9 f; V" e
. u, Y" ]- k* k0 F3 z, h+ c0 y5 V6 J
  ask roads [ set pcolor white ]
8 s+ c1 W& q4 m: Q    setup-intersections# |8 d! @5 t: d* x: E
end
& b- L' N) K' n其中定义道路的句子,如下所示,是什么意思啊?
/ {. V5 h( Q! s+ h, G set roads patches with- C% d% A- f' W! m
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 Y* F2 a" T5 q    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* Q; H7 l* |* I5 G8 k7 D! C5 G3 v  B# o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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