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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。& N+ D; a/ F2 I- B4 g) a! s
netlogo自带的social science--traffic grid这一例子当中,8 a9 H7 `; H" \0 W, s2 D
globals
8 Q- P, T" I( a2 j) L; r/ x  b[$ p  P6 N# M# j4 ?# b
  grid-x-inc               ;; the amount of patches in between two roads in the x direction# h; j; u# B! D+ g9 C1 ~
  grid-y-inc               ;; the amount of patches in between two roads in the y direction" b) }* ~# E; a' A& R
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
! }# e0 x& m6 M  P) ?! b                           ;; it is to accelerate or decelerate
( t# L" P3 q  y/ K! S5 ^* ?! A$ P  phase                    ;; keeps track of the phase
- A  r( `7 A, y& ^6 ~. f  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure+ V3 Y  a5 B; E( u# p9 j  V
  current-light            ;; the currently selected light
' P8 k1 \7 q* r% C5 j( |
$ D9 r/ G4 ?% Y  ;; patch agentsets) D( l! ?8 S/ I# I$ R# o4 n8 L8 I' Z. P" j
  intersections ;; agentset containing the patches that are intersections; n: t. t$ B: e
  roads         ;; agentset containing the patches that are roads
0 i& H/ {  _/ l/ @4 ]1 G]5 ~2 _) p& k; h$ B% I9 I) V" e( f
! P# |) X0 a& e3 ~; ]% w) j5 I
turtles-own
& w( B0 ^* ?2 c) P; w4 W[
/ i( @# H/ {  r  [  speed     ;; the speed of the turtle
  U, s5 T% N: S3 H7 H; F% Y4 h  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
- V: Y+ |& z8 ]6 A  wait-time ;; the amount of time since the last time a turtle has moved1 L" U6 {" t7 a8 l
]2 O, m/ Z8 i; Z1 b, C8 Q  O

8 e4 D1 K+ }! t+ D5 u+ bpatches-own5 z: C9 ^0 q/ R+ t+ c* L* d
[/ c" ^, C& U  {; E, {- J8 m5 L
  intersection?   ;; true if the patch is at the intersection of two roads) I9 o. ^! b  l
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.6 h9 a7 W: T2 }9 d6 g3 F
                  ;; false for a non-intersection patches.
3 t. n8 L4 K8 v( O* V; a  my-row          ;; the row of the intersection counting from the upper left corner of the
% C/ C# v- h% E% O* @) }* }! [                  ;; world.  -1 for non-intersection patches.
# U: o6 L' T- Q4 X1 p* z  my-column       ;; the column of the intersection counting from the upper left corner of the" C+ j. Y* c6 R7 v$ i" l
                  ;; world.  -1 for non-intersection patches.
' _* n: B' M  `0 L/ G; l  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
* @5 i3 @6 e% i2 R% u. S  auto?           ;; whether or not this intersection will switch automatically.
9 F3 ~' r/ k6 K                  ;; false for non-intersection patches.
/ p4 b  T2 O% J0 e) t$ Q) C$ R]
4 S& M' C+ L+ ?0 P2 I! n  N7 x6 L7 j: i/ V( u% _: T
! F# i2 S  y, \
;;;;;;;;;;;;;;;;;;;;;;
/ \2 q2 @$ o: _4 J8 i;; Setup Procedures ;;6 G$ W3 J' j# z* ^
;;;;;;;;;;;;;;;;;;;;;;5 C+ K% D2 i) }+ u6 A

( m4 r% k/ n3 M) K: U+ \7 N8 [* _0 };; Initialize the display by giving the global and patch variables initial values.
% [% ]- Q3 R* d;; Create num-cars of turtles if there are enough road patches for one turtle to0 G  b2 r$ |/ Z' Y/ T- ]" b
;; be created per road patch. Set up the plots.
5 n' Z  `* t6 i- f$ i; Hto setup+ d6 H: Z  f" p
  ca, P! I  H" X9 d
  setup-globals
6 e9 U4 }9 c9 r* f* s3 p
0 P' ~. d4 b2 [  ;; First we ask the patches to draw themselves and set up a few variables
; O+ N: e2 d3 P& v; J  setup-patches
5 n& d- d2 h" J# E1 {  make-current one-of intersections
1 D) t; r& e. V0 s" }  label-current; N4 j8 y+ k8 B' m9 Y, R

) I2 L" b( e7 U6 a# v1 o1 y  set-default-shape turtles "car"
! k3 Z" M: D6 o7 e& R
2 ]3 [3 w& K: }. `9 [; x8 ^  if (num-cars > count roads); l, o% I: n, o0 ]: X
  [' b9 h: s' a& k: z
    user-message (word "There are too many cars for the amount of "
( v) F) J5 r: R$ p( }; [3 C                       "road.  Either increase the amount of roads "/ m6 D5 f- ?  @, [8 W, q
                       "by increasing the GRID-SIZE-X or ". q& [1 s9 n6 ^! i) [
                       "GRID-SIZE-Y sliders, or decrease the "
$ N4 s& H: X; J                       "number of cars by lowering the NUMBER slider.\n"9 m* J, l! _4 n" h4 u
                       "The setup has stopped.")( u9 X8 y& D9 ]+ e$ O
    stop' X9 D; n7 `$ H5 y2 b6 _
  ]) n+ m$ t& h! j. R+ i0 n% g, r
! e4 E2 j9 F: a, Q, O' n
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color: ~3 I$ h7 |* P8 l' l% F& c
  crt num-cars3 S; S8 f1 e1 I) {/ U
  [6 ~8 l, h3 s9 h1 _: I* x! F- [- Y0 [9 i
    setup-cars0 J' e8 d0 `- v% b, m- |8 w; `5 U) c
    set-car-color
5 F9 f2 N( a+ K, G. ]$ m3 N    record-data
) i; J7 P1 \7 G. O* y  ]) v$ b2 @7 I/ ^. L; ^) P
' g0 o% R! Z4 g
  ;; give the turtles an initial speed0 X: t* R) a# \$ C$ c2 r) M
  ask turtles [ set-car-speed ]
4 K5 _2 x4 Q- W# O/ ~. z6 N5 x7 q) f+ u. ?4 N
  reset-ticks
7 @# d# E) N6 z" F6 u  qend- }0 q6 d; W7 d) h: H$ m1 {
1 t  @- ~! K  ~% E+ {. |$ ^: p
;; Initialize the global variables to appropriate values
1 j6 b+ k! p& c4 b8 B( j' Pto setup-globals8 k$ P% k* f* [/ _/ A3 B+ H
  set current-light nobody ;; just for now, since there are no lights yet
8 v9 M5 u+ {) l/ q) \5 I  set phase 0# U4 y3 @5 Y9 D" v
  set num-cars-stopped 06 P+ U6 M9 F) K+ Z/ ?' ^6 `' L
  set grid-x-inc world-width / grid-size-x
. Z* F1 ]4 z0 G  m! J' i' I- x& i  set grid-y-inc world-height / grid-size-y& O; E3 K- Y8 k( j5 z3 t
* R* p) V- Q7 ?  H2 r/ B# L
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
% L$ J  Z" t) G. o3 z* v+ n! \  set acceleration 0.099
7 w! _4 E$ c2 s. @6 }3 {  a" lend5 y7 M( \9 _3 ~. p4 k

" r8 _9 J2 z, c' K9 e% s;; Make the patches have appropriate colors, set up the roads and intersections agentsets,1 D( `& ^1 i' F( G2 ]  f5 `+ f
;; and initialize the traffic lights to one setting
. ^. {5 V4 j# P' ~+ y0 m. wto setup-patches
; g  e$ {: U+ \  ;; initialize the patch-owned variables and color the patches to a base-color
: m! T- e9 k6 v; n) ]  ask patches
0 E8 z1 y& K  Q; m% `0 s  c  [1 t( {0 Q  Z7 o' u1 c
    set intersection? false3 F' }+ ^3 ]8 L2 P
    set auto? false
+ e; F9 u, F' j6 W8 d0 ?: X$ X5 Y    set green-light-up? true
7 U; t# `" z) E* h1 m* o. Q6 I    set my-row -1. c) J8 P2 |6 _% j! t
    set my-column -1) x& o0 s& r' ]0 M
    set my-phase -1
9 `, v! H  o2 F! {# S    set pcolor brown + 3
3 H, e" j/ Z6 ]# ~; M4 q  ]
' Y& g& v- A( _9 K6 z( [9 j& y
3 b$ q$ u% f0 j- Q- R  ;; initialize the global variables that hold patch agentsets8 {+ [; n! h* x- ~/ q2 a, i6 c
  set roads patches with) ?0 p' l8 E1 a( r7 |+ K- I
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ _" o: \+ w) Z( I
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 L4 V2 n& q+ ]! o  set intersections roads with# j% e( N8 @* H) [7 @9 m% v
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
4 q) r- I" F4 Q! [& }: {: m    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ A# _- K, k' z' B, }% `

9 x- Y3 `  S5 }) ^% N4 j+ H  ask roads [ set pcolor white ]
1 P5 F! f3 w: _, _; k, c    setup-intersections. [" }/ t; Y( b/ [2 s! i: R
end
( ^9 D; B& Y; U$ @  Z其中定义道路的句子,如下所示,是什么意思啊?
# t$ _) X- V6 b" V, Q set roads patches with4 L" I4 J+ P. j) `8 {; |
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# n* ^* b/ M! U0 \' R! O9 t: A8 M    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 U; ?8 h) s! Y- y' Q6 |: h0 d; Q- n# V
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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