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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 m- c( r& s, i& E2 |! Fnetlogo自带的social science--traffic grid这一例子当中,
$ C3 s3 E' w: b& Iglobals
0 S) g" |) r9 i[# z- J7 F% V( e0 H0 a
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
$ G1 v" n) A& x% p. K6 A! ?  grid-y-inc               ;; the amount of patches in between two roads in the y direction
( t' m7 q5 ^2 s  P" ]  acceleration             ;; the constant that controls how much a car speeds up or slows down by if9 }; b! J: \; D0 ]* c1 d3 Y* d7 r3 q6 i
                           ;; it is to accelerate or decelerate8 |4 n2 ^3 g& g- k2 `* J: v7 F
  phase                    ;; keeps track of the phase- p1 W; g5 ?; `) |; }( J
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
9 I* P+ W5 M/ a* b4 G  current-light            ;; the currently selected light
6 U# o- ]0 t- f+ j) U3 K: X' \
5 M4 p. T" d9 s  ;; patch agentsets
# S0 c: n0 Y0 m  intersections ;; agentset containing the patches that are intersections
- X7 M; Q, {, |' R3 e- ]3 U. H1 ?  roads         ;; agentset containing the patches that are roads% q% H0 W  w$ u% z3 P" G8 Q' e# B
]: p% a! }+ j7 A) }4 ~' `, k

# d9 m! o# \. v2 y9 k% iturtles-own
: h5 f8 C1 _5 K: {! m# i8 ][
" H* G% {8 z  Z  p/ w  speed     ;; the speed of the turtle0 U" }& W! i" e, h
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
- W# ~8 N% L' f" V3 [8 ~  wait-time ;; the amount of time since the last time a turtle has moved) Y2 Z1 Z; p) l  l7 @/ F
]/ B" s0 Y& P% o

1 ?: Z! }- k  r& V/ Wpatches-own" m9 m  O/ ?/ @: ?2 F, ^0 d3 s1 b
[
7 u8 k' [+ l: [. a  ]& i# m! E  intersection?   ;; true if the patch is at the intersection of two roads1 r5 b, `0 f* c, \; X- [
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.0 B9 |2 V4 x7 g$ h# I9 |
                  ;; false for a non-intersection patches.
( M; n0 K7 c% j: ~4 d, q7 w  my-row          ;; the row of the intersection counting from the upper left corner of the* C! D8 X3 M5 B( o
                  ;; world.  -1 for non-intersection patches.
& a$ \8 C; Y1 G  r4 _" Q  my-column       ;; the column of the intersection counting from the upper left corner of the( P9 y+ @/ x6 \  r* ~
                  ;; world.  -1 for non-intersection patches.: @. Z9 i& U' r4 i
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
: T- q# B* e2 R) D  auto?           ;; whether or not this intersection will switch automatically.1 z' S& j+ v( w% ?
                  ;; false for non-intersection patches.2 I+ b% H7 i$ ^1 M3 R" Z
], S) p2 i, B! w# G3 ]+ a

0 C! ~( x# @. b8 q% f
6 d+ d7 r% \) u; t4 C: T0 B3 g;;;;;;;;;;;;;;;;;;;;;;
2 k7 D1 ^/ b& |) |: v. |;; Setup Procedures ;;
3 M% H7 X5 d5 p* W# U;;;;;;;;;;;;;;;;;;;;;;
- J  C4 ~  ]  R4 x. B0 U7 T5 N( D4 K/ w3 I3 ]% E3 t
;; Initialize the display by giving the global and patch variables initial values.
9 Q4 ~/ @! L* q+ a+ x0 v1 y# {;; Create num-cars of turtles if there are enough road patches for one turtle to
* D( ^; i3 q+ N( b: x;; be created per road patch. Set up the plots.
8 v  f8 L; F& M1 ^to setup1 S6 {& }% d. o% {
  ca
' V* o: b$ i9 v8 K  setup-globals
+ r6 F' W" \7 C/ {6 o0 D8 t! s8 G' o' r, E" }  g/ Y
  ;; First we ask the patches to draw themselves and set up a few variables
6 V# f' l& d% V6 v  setup-patches
! z6 z/ Y1 [6 v# P  make-current one-of intersections5 |" [7 s1 g6 I' r% q
  label-current
1 J7 C* f$ k3 X  i. v+ d+ [3 X: i" a& q/ |% k
  set-default-shape turtles "car"" q+ y. g4 q4 a5 m8 t% d

! D* S) s& B" C5 F# Y# f" G# i  if (num-cars > count roads)
+ y$ e3 d+ K& y  g! M  [8 T1 M. g: E' N! Q) f. t
    user-message (word "There are too many cars for the amount of "( `; }" F1 D' u2 ~! G/ j4 K
                       "road.  Either increase the amount of roads "- d( ^5 a0 n5 d4 @
                       "by increasing the GRID-SIZE-X or "
7 Q- H3 T8 E( |# Q8 I                       "GRID-SIZE-Y sliders, or decrease the "
9 }# N& F2 C, ^* I                       "number of cars by lowering the NUMBER slider.\n"
% N; f; g+ K+ a9 m- w7 o1 }                       "The setup has stopped.")
  X: A- b9 R- V' B9 A3 q    stop2 S( B* i/ \0 @0 H
  ]
3 u2 G- f8 ~# {
2 r2 ^) \0 G8 o  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ g: M& p5 _7 I1 Z* X
  crt num-cars
  \- J7 u' `4 B! O4 q! W  [6 P. p" |' D# g
    setup-cars; y# |$ n/ Q3 b
    set-car-color7 w5 e1 N, G! W6 `! f7 o( @
    record-data/ y9 j/ K% Z- ^: y0 Q" J' M
  ]
2 H9 U" x3 E0 `; V9 @$ P) Y) j/ N" Z1 f+ [+ }1 `
  ;; give the turtles an initial speed
6 j5 C/ \! ?) h- L& R! F. L& c: T. A  ask turtles [ set-car-speed ]
3 w7 A4 O9 C8 y# G( M5 h; i) |8 g2 H  P/ g5 Q4 K& o. T
  reset-ticks8 z/ H) Y2 ^# y/ V& P
end8 u  E# j: j4 p# T4 M9 f
6 I7 d6 w9 g( w8 _- b3 k3 @
;; Initialize the global variables to appropriate values+ ^8 b6 t( [9 `  W0 f2 Z! Z& h6 ?
to setup-globals
4 m) j) [) t, ~  set current-light nobody ;; just for now, since there are no lights yet( \1 c) W8 f0 w% Z
  set phase 0
, q, D  @( H( I5 {4 }! f! F1 {  set num-cars-stopped 0
( U* J- I% S7 @" K) O& q/ c  set grid-x-inc world-width / grid-size-x
. Y+ r! Q& _' S6 W2 i  set grid-y-inc world-height / grid-size-y# E" l) x" a$ P- T# f4 ^: Y

1 j8 F2 l1 e* @4 o, u  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
1 Q1 x' u8 }  z: d" q  set acceleration 0.099
; b# ?: `# n  Y3 aend3 K# @0 R$ t6 _5 D. {6 c
& G/ Q' p6 G8 r: R( w
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,: d7 v& @+ g& }6 m0 A7 C
;; and initialize the traffic lights to one setting6 \3 R9 p& N3 x' y5 w7 _
to setup-patches
; Y2 K+ h& R: e( I  ;; initialize the patch-owned variables and color the patches to a base-color% D& w: K$ f) x- I, y' J, X; H
  ask patches
* C7 A- I5 o/ ?, q$ p% s; G) k  [
( q4 d' Z2 H5 i+ s) U7 r& ?8 r    set intersection? false
1 [; u  T' V4 R' r- s1 M& [% x    set auto? false7 Y+ J. w& |1 z+ {) b3 g
    set green-light-up? true& ^! a. b9 ]0 h4 y
    set my-row -1
1 F( Q+ i/ a3 C    set my-column -1
2 Q9 b) K, G) v. n4 J. ^    set my-phase -1) J8 S. g' O% ^. \4 m& T
    set pcolor brown + 3
3 [; V1 E! [; p; j) J! m4 ~! k  ]$ O) v+ z# O7 a. ^7 V5 |# Z
. ]+ G! |$ T: G, Y; {/ |* |( Y- b0 C
  ;; initialize the global variables that hold patch agentsets
3 K, H% T) U5 q1 ?) C% J$ \  set roads patches with
4 m: ]# N' g& R+ V    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% E$ R+ F6 W' n: A4 V: {5 ~9 R7 q    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" ^2 t1 r3 C1 ?* ^  set intersections roads with
# {9 [" a* p, \2 C7 R' G- d    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and4 A/ i3 S8 |9 h- k; i
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 U- N% W1 C3 m" ~+ G/ u; R0 K% x
7 N8 `2 K) @; B9 T1 i$ _
  ask roads [ set pcolor white ]. o. w9 w8 g* V5 f/ X7 {2 [
    setup-intersections
' B8 ]  `- f. K' u% g8 k  |end
6 W0 K: D& m$ a" j! e- e, E9 a其中定义道路的句子,如下所示,是什么意思啊?
) d2 H% _5 j$ t set roads patches with) W1 ^8 P+ D& d3 P# v& p
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ ~4 L8 ]7 `' X; i    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- I" g$ h' X( |9 s! 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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