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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。
4 R- Q1 C- O; B. u, Mnetlogo自带的social science--traffic grid这一例子当中,6 T8 f1 f- Z+ `! H  |/ L! N! r! ?' P" f5 L
globals
; l0 I6 s, \( }7 I" W[
1 s4 s$ a5 C, N  grid-x-inc               ;; the amount of patches in between two roads in the x direction# U5 S$ j5 h5 P; `) ?+ F4 z
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
" Y& D$ z3 o: Y8 e' ^  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
  w# e9 L( x% R# `5 l                           ;; it is to accelerate or decelerate# b" U! a4 |; Q# t" D
  phase                    ;; keeps track of the phase
# ]7 A7 J3 c& U$ G  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure" q+ p0 P1 l; Q% P. u
  current-light            ;; the currently selected light
1 J/ M) e9 E! ]6 M( ^+ I! Y
; G1 D0 S9 l% p& g, @  ;; patch agentsets
3 U% I/ n+ a  i; L  intersections ;; agentset containing the patches that are intersections; r3 y$ z1 R4 b7 ~
  roads         ;; agentset containing the patches that are roads, V6 T3 L2 t1 |9 D9 {/ I
]
) @! ^/ _* C, i+ G% q6 C2 b, a; s- M( P
turtles-own! _0 J+ _, M9 K$ h
[4 \) S# k! I7 t
  speed     ;; the speed of the turtle
- T9 D0 v" @$ Q& {3 e  up-car?   ;; true if the turtle moves downwards and false if it moves to the right5 D  A0 {% X- D- J* p* m
  wait-time ;; the amount of time since the last time a turtle has moved
& {4 \" X+ D8 g]
6 j- e& w; R; K6 D  a/ G; P: v
9 N; _& L# {1 B# v$ Gpatches-own6 [- f3 P# e6 Q& V$ k
[
" D4 U# C% Z$ _5 a1 u0 n  intersection?   ;; true if the patch is at the intersection of two roads
/ h2 O7 j& ^! c. {8 S  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
4 P. T. `, Z& b2 z/ b; m+ Q                  ;; false for a non-intersection patches.5 Q3 i0 D5 n# b6 q, `) J( v
  my-row          ;; the row of the intersection counting from the upper left corner of the$ B! O/ y* \" U: A; R0 x2 p
                  ;; world.  -1 for non-intersection patches.
% Q- a5 T0 e/ l  my-column       ;; the column of the intersection counting from the upper left corner of the( \) d0 l4 `6 Q$ {* M
                  ;; world.  -1 for non-intersection patches.# s0 o: g9 \- `2 M  U& H1 e% [
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.! M" i! g- J, K7 ^) Z! i
  auto?           ;; whether or not this intersection will switch automatically.; M0 a' F$ f9 M% Z0 ]! [
                  ;; false for non-intersection patches.0 v  W4 G4 ^- J) V6 ~7 N
]
( f% N/ W: {# s- @# {+ {! \( v: p- U7 w1 }, O+ b- D6 c. X
6 s/ Q4 ^6 H0 ?. ?5 S2 W
;;;;;;;;;;;;;;;;;;;;;;
9 r: C$ _& y) O% I; B, r4 l;; Setup Procedures ;;
+ l! \. E0 r; f8 u5 A3 o& N;;;;;;;;;;;;;;;;;;;;;;
& `) h6 \; r/ S# m( c' b0 A! F. }
4 K9 V$ U5 G& a/ N;; Initialize the display by giving the global and patch variables initial values.
6 N+ f9 F8 S& s  ~* d! r- A  J;; Create num-cars of turtles if there are enough road patches for one turtle to
6 v# m. o5 _6 D;; be created per road patch. Set up the plots.$ {% ^! J% B! r; l+ ^" w+ R: T
to setup
& M* A1 a! a  U4 L( s# k/ G  p  ca; M% H( M% _4 F8 L0 I- }- U' }
  setup-globals
2 ~5 }! m* r. t3 X
% T( A3 [5 `( \  ;; First we ask the patches to draw themselves and set up a few variables) Y; G, H$ u0 x" X: ?3 p( k
  setup-patches
6 X+ M1 I- }' b5 T/ S  make-current one-of intersections0 t9 J, w4 r9 `$ Y
  label-current- q. T! S  M8 A) f. z7 K& b

. j8 z! V/ q# }  set-default-shape turtles "car"
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& M* C$ O6 x( t6 h! _  if (num-cars > count roads)
3 n# r# J, _1 q% Y8 k  [
4 A# w( V' O, \- ~5 q0 [7 \/ w" e  U) Y    user-message (word "There are too many cars for the amount of "  |6 ]6 y- M# ?. J$ Z9 Y/ g& t) m4 V& K2 f
                       "road.  Either increase the amount of roads "3 _( e- {5 z" H! C: z5 ]3 ]
                       "by increasing the GRID-SIZE-X or "9 t: D3 c% B$ G1 M7 h
                       "GRID-SIZE-Y sliders, or decrease the "
+ G& |  [& W: L. p3 i                       "number of cars by lowering the NUMBER slider.\n"
' ~$ a2 T, M5 I" B& ^3 L                       "The setup has stopped.")
5 o/ Z( \. V/ C6 Q    stop- _$ V, ^3 C) h" F8 n, J
  ]( `8 T, U; s! A0 c  w8 V; ^

0 R7 R" d* w4 m* o4 g; v2 ]  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
/ w" z6 I! R, ~5 L7 v5 ^  crt num-cars- A* q+ Y# T% {8 |8 W3 ^9 A
  [
$ [. L8 p8 }7 u0 Y( d3 J" `; f    setup-cars& x& `3 w7 X9 S2 |4 B3 K8 i5 M
    set-car-color
! x6 `0 a; N" q" ^( z" ~1 I    record-data
6 ~9 T- k1 {4 e* T# R0 N  ]
& `% d7 ]" S7 S  ]$ ?; [% X9 e  p& P1 {: r9 ]
  ;; give the turtles an initial speed
' e9 t, [! _- u. g/ [1 o1 Z  ask turtles [ set-car-speed ]
0 t1 J0 U: ~6 }
- y3 g0 }  \4 R) L% ?+ I+ t  reset-ticks% M6 P% \* ^# b% d# \
end, A5 V: Z* S  E0 h) y
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;; Initialize the global variables to appropriate values
* Z/ V1 T8 g: Z; i3 Jto setup-globals" F/ `; G: ]' b, }
  set current-light nobody ;; just for now, since there are no lights yet% b. `! l1 ~+ X$ J
  set phase 0
( A8 G% c# `' ]2 k; N) Q  set num-cars-stopped 0
  X% Y7 t# ?2 u; d( X6 g  set grid-x-inc world-width / grid-size-x- A: R4 W) h3 i# n4 D7 x6 j
  set grid-y-inc world-height / grid-size-y
3 B# m) U( o: Y' G7 A2 V
1 L* r! a, D. c5 a. Y' H6 F  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
. H) U' @3 l- |8 _  set acceleration 0.099
( X1 W+ |$ |! }  N6 yend  H2 I2 E, b* O, `: P
2 M6 W0 n8 c  P7 _) O& n
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,9 Q4 }4 ~: Z3 D6 B& E
;; and initialize the traffic lights to one setting
8 o7 h/ d9 l4 N* A/ Dto setup-patches
  z! e8 Z# R5 p: ~9 X* A  ;; initialize the patch-owned variables and color the patches to a base-color
# ~- H$ M- q0 o* b1 [, n  ask patches, u3 O: h; Y# `$ Y0 H
  [+ f7 ~& n/ v4 |7 |9 ^/ R) O+ J
    set intersection? false
" c; g3 l5 q8 P    set auto? false
5 P4 E" F1 s8 v% [) W7 b/ S    set green-light-up? true, X" a9 e9 R+ H2 W# K/ I
    set my-row -1
' M+ t8 q1 ^" l* G* J" S    set my-column -1
0 S0 Y/ j+ ]: B. d* e% |& k    set my-phase -1: [4 C3 Q% Q  U& M
    set pcolor brown + 3/ u: ?# W5 s" v1 C, c
  ]
4 O3 a! A! N( S" s0 i) J9 k1 C2 G+ C
  ;; initialize the global variables that hold patch agentsets
/ I' I) l3 H/ y! F, I; ?  set roads patches with  ]' w7 H, i/ y! d
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' V9 S' p: c' w9 F0 _    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 m4 a! Y' t& z; G) [$ Y' y  set intersections roads with5 g* ~1 S- q$ A% d9 G! I! O+ m
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and9 e: D: k, Q6 Y: y7 r
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) P: t, M3 T1 D5 b! W: i4 T

$ }, Z9 A9 X& j4 s& o7 L  ask roads [ set pcolor white ]
% V2 r/ y0 k& n6 m  P  q    setup-intersections
+ W% K$ {  m' ~$ v% K, u5 Qend
: j7 @" ~1 W  s: e# L其中定义道路的句子,如下所示,是什么意思啊?4 Q# m- ?! E( r# R+ k' y
set roads patches with0 f7 |! C7 \2 |. K$ R4 K; Y9 v
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% i* ~* M3 H1 ]# \
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; v& Z5 d. f  N! H, s3 N- Z
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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