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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。8 [: K9 u2 x6 R+ o' ~3 X
netlogo自带的social science--traffic grid这一例子当中,, v3 Q. M% I: W; I
globals
6 c3 C4 G) s# h[. ?! H9 c- {* b0 @
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
* U  P( s" X4 O9 l$ `$ s6 b  grid-y-inc               ;; the amount of patches in between two roads in the y direction3 w& ^1 s3 G" ~. X
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if  |# d; U' |5 X" p- @! j# V% w# s
                           ;; it is to accelerate or decelerate
8 p( i  J( I1 c- S) y  phase                    ;; keeps track of the phase
& w. t) R$ `4 U1 Z/ H7 a! d  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure# _9 ?- E, G# K
  current-light            ;; the currently selected light+ ^$ W6 J& X1 Z5 I4 P. r
3 @+ A  _* Y9 U/ r9 r2 Q
  ;; patch agentsets
" Q8 A3 i7 C! S  m7 F3 o  intersections ;; agentset containing the patches that are intersections
0 K3 G. `: S" G2 ^& ?* a9 `  o6 f  roads         ;; agentset containing the patches that are roads
/ v# D  M" z5 v7 r]9 Y  x+ I) c; f4 b

; Z! @, W7 o' Bturtles-own6 o" f# n! o7 N  t- L( q* X
[7 R& s% d# A+ N" o
  speed     ;; the speed of the turtle3 Q1 G, z. R( W8 S2 V) c+ V
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
; Y4 B  x( `% u0 d! X* T7 f: t' Z  wait-time ;; the amount of time since the last time a turtle has moved
$ `# _! x3 K) s) q4 t7 o6 l]: B8 [. V1 D+ D+ N& ]& \6 Z) h

. [& u* o; a* D7 V9 y/ D) e# c6 @patches-own3 v4 i: C; S% ^' R0 t( J
[
9 o% g. y* ~7 x1 V% ~" e  intersection?   ;; true if the patch is at the intersection of two roads6 {, X$ z& _( v: L$ `( r$ u3 d1 x
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false." S# E  W( B. e$ A. e7 g5 P& x9 v
                  ;; false for a non-intersection patches./ T. n$ m, p( p% Z
  my-row          ;; the row of the intersection counting from the upper left corner of the2 C# x& j$ }% {' m. e2 K
                  ;; world.  -1 for non-intersection patches.: e/ b% E& u) I7 S* t5 w; p& V
  my-column       ;; the column of the intersection counting from the upper left corner of the: k7 a6 c- H5 T3 B) [8 p8 U* l6 P
                  ;; world.  -1 for non-intersection patches.
+ o4 u( S0 T2 F! Z; D* u  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
9 q$ t5 {: B0 L% J2 C! n  auto?           ;; whether or not this intersection will switch automatically.
& n7 e, w+ s: d# E* N                  ;; false for non-intersection patches.5 _! e; Y% c' k9 g$ n1 Y
]
7 ]/ Q1 E: a: z2 Y- O6 |9 `) @( W- E3 d7 q
$ H' \1 K4 h2 V9 X$ K" k0 g
;;;;;;;;;;;;;;;;;;;;;;
7 m3 s0 K0 {5 ]: _! p;; Setup Procedures ;;# c7 q+ c( t* ~0 m7 V+ o) E
;;;;;;;;;;;;;;;;;;;;;;+ Q  H6 V) E- b& N8 ?
" s& H* a$ Z% }
;; Initialize the display by giving the global and patch variables initial values.* T; N: \; `# ?* ?
;; Create num-cars of turtles if there are enough road patches for one turtle to
' r9 s/ ~' J) Y! p4 P+ W* T" w) J;; be created per road patch. Set up the plots.
/ A( f* I5 p/ R! |- X  v: B% N3 ito setup
0 t% U# [- S' I6 Q" n% `  ca- B! _4 ?3 y) s9 V% i
  setup-globals# x5 j& Y& A( ~

; V$ b* n. f- X; @  ;; First we ask the patches to draw themselves and set up a few variables
  `9 H5 A0 S' j0 T; G  setup-patches" f0 w/ V+ Y! d; D' Y8 T
  make-current one-of intersections% m9 U+ X% [. E7 I7 L. c& E4 v+ F
  label-current
/ q5 ?& S* w, j6 N6 C8 v  X
) i9 U! ]5 d( V* q) \1 p: ^3 F  set-default-shape turtles "car"
5 K& z2 ~! V; a% m, b7 ~4 h7 b! j
  if (num-cars > count roads)
) G% d) C# ^/ E" X0 ?& c- C  h  [
9 A) E; O2 @" i( Y8 {    user-message (word "There are too many cars for the amount of "
, }: ]: O5 E; g- {, V                       "road.  Either increase the amount of roads "
. U: J" s7 s9 m- y( e- W6 X1 h                       "by increasing the GRID-SIZE-X or "
  a7 {, m& K1 g# o5 J/ z                       "GRID-SIZE-Y sliders, or decrease the "
: m( h& H7 B3 p) X                       "number of cars by lowering the NUMBER slider.\n"
* f6 M% B* ]; m+ R                       "The setup has stopped.")+ o: y" [6 }: |
    stop' R/ K' Y$ Y8 ]* \5 z: E, r
  ]
7 X, g/ l  I8 q- |' `
6 f: c5 e( b* i- t0 W  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
* K+ z, X8 F' G7 n0 D% y! ~& Q  crt num-cars
$ ]8 V+ A- ^  [4 f& |  [7 M9 v$ K9 ~, c" Y! y
    setup-cars( N* [. l3 B+ u
    set-car-color
4 q8 I% e3 Q8 |: R. E* [    record-data. c9 W8 L) l5 D5 ]5 |) j
  ]9 w& \$ q2 q$ k% D; N6 ~. A
/ h5 `: T# l3 h- x1 J$ Q
  ;; give the turtles an initial speed) W  q  Z$ G  w; d* S; _6 @" U2 p
  ask turtles [ set-car-speed ]6 o' ~5 e. r$ K8 N

5 r' r9 O/ x# q* ?0 f: j" I% F- x  reset-ticks$ i, R) ?; `  m7 g+ l
end
2 r( R7 o+ ^3 W% t9 [2 d3 S# g2 ?0 U+ P' E4 b) W
;; Initialize the global variables to appropriate values$ E9 R( g( P0 G3 V1 F! P0 D* t- w
to setup-globals4 [2 v) I$ ?1 M6 w$ k  N" M
  set current-light nobody ;; just for now, since there are no lights yet' R. K5 r8 E% I6 Z% ~0 f
  set phase 0* K  Y- ]$ V3 e8 U
  set num-cars-stopped 0
! j0 H* ~6 B8 j. f" j  T" l  set grid-x-inc world-width / grid-size-x& @$ S! l  O( @8 W0 i
  set grid-y-inc world-height / grid-size-y
5 k( ]5 i0 t/ s" q  e) F9 S3 h  X' r6 j$ ^7 u
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary9 d/ H* X9 n/ O; y
  set acceleration 0.099% Q! D* x: l5 J- S
end
' i' L9 [5 I6 l8 t4 s5 A; m5 K" l# {% n: R/ K# i5 x
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,7 P2 M; o3 \) H# [" Q
;; and initialize the traffic lights to one setting4 M  I* V# }* G- U; {0 d
to setup-patches
. i, K* R( S" ]$ Y2 Z1 T. V  ;; initialize the patch-owned variables and color the patches to a base-color
6 j2 N  U9 t. i  ], O$ E  ask patches8 W  Z/ g8 X" n& p0 N% a! j  i
  [% O, M3 `( O% v8 |* ^& k
    set intersection? false) _6 l5 ~$ [. Z4 ?1 f
    set auto? false
+ l2 I6 H4 X  C8 E" J4 d    set green-light-up? true# q# b( S& i& |
    set my-row -1
0 [& [9 _) L" {0 J* g    set my-column -1
8 s3 `/ _  |. Q5 ~% Y    set my-phase -1- x& m) I- v! M0 q5 {
    set pcolor brown + 3/ o& L2 m) r1 L
  ]
! F7 N, t2 u; ~5 J: b, m. J: ]  U6 m/ Y8 E7 X; t) ?
  ;; initialize the global variables that hold patch agentsets
' }7 u, y- L3 E1 Q  set roads patches with, `( k, v. J( p  N; e: `6 ?: L
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) w$ t+ M6 k& h5 u
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
  D) A9 b, L3 L) J( x  set intersections roads with
6 W* \( z" Z. u' L: s, {3 C: R3 [    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' z7 T: y$ e5 V5 c    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 H4 c6 H* j# w0 W" o- U  y3 W- w
: T$ \* z$ m8 d5 b  ask roads [ set pcolor white ]  q2 z3 F7 v1 n3 I' y6 `- a4 \/ f0 F
    setup-intersections  W3 B- ?* r" n6 i
end
* ~+ f3 g2 Y$ ~1 j9 a  H% y其中定义道路的句子,如下所示,是什么意思啊?
9 o  c. O+ I6 L) l% j set roads patches with* f4 Z" Z/ V" N9 H6 M4 u7 W: B3 r
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 N( x! `( u! U9 r# p" U9 G7 V
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 P% u4 R9 }( @0 \& u
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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