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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。
/ Q; _; {2 ]+ _6 nnetlogo自带的social science--traffic grid这一例子当中,
% P/ t& v1 K* n( @% @, S; Bglobals
) z4 {$ k6 f2 R5 E3 u6 [[8 Q) t* g& o+ [5 H" x) ?$ k
  grid-x-inc               ;; the amount of patches in between two roads in the x direction% d. h  G! S* p) u0 {  ]
  grid-y-inc               ;; the amount of patches in between two roads in the y direction9 m7 }; h( I9 Z8 V+ L! v
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if: a  ^% i) E( W! C% v1 c0 L
                           ;; it is to accelerate or decelerate
8 p- \9 I4 x: J) q; M0 A( \+ c, M! C  phase                    ;; keeps track of the phase
7 c# D5 i/ g  V4 @: x  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
: j3 P  R- K8 v% ~9 i  current-light            ;; the currently selected light
8 w4 L4 M5 A% _" i; p
" d2 d6 \" ^; Z6 y9 ?- X: c: }  ;; patch agentsets
9 W3 w$ n; j! ~3 z  intersections ;; agentset containing the patches that are intersections$ S+ |6 E# f0 z; C6 e+ V
  roads         ;; agentset containing the patches that are roads$ p: p5 ]! L: X/ k& m
]' i/ X. P  C- z5 ?3 ]) m: `
1 z, a' Q; H7 D2 w: K
turtles-own0 H* Q5 x" U9 ?7 L
[: ~" L# t; n5 ^9 L- s4 a
  speed     ;; the speed of the turtle
# a2 B0 z" n4 U  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
" l" s. U) ?, _, X8 U/ a( X( x  wait-time ;; the amount of time since the last time a turtle has moved
$ z* [: x5 Y' J% p]
+ Q: b' a$ f, o) x
4 B1 F8 B% X2 U7 dpatches-own
2 V% H! G7 h0 I4 E# j! a6 ?1 B[1 }0 O: U8 Y" I3 j4 F4 z0 F
  intersection?   ;; true if the patch is at the intersection of two roads
: Y' ?" S. R7 r3 m  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
7 ^1 {: @9 R3 `1 P5 t                  ;; false for a non-intersection patches.2 |* a: H& @- @
  my-row          ;; the row of the intersection counting from the upper left corner of the
" k9 e" a2 ]# q; f8 H9 C                  ;; world.  -1 for non-intersection patches.& f4 ^$ A7 z8 A8 {
  my-column       ;; the column of the intersection counting from the upper left corner of the+ B5 q. u$ [5 n9 L6 @5 p  y
                  ;; world.  -1 for non-intersection patches.
# R4 D+ H' E) V9 J! m  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
, P1 @  x/ W" ^! K  auto?           ;; whether or not this intersection will switch automatically.
5 J) O6 e( j/ G                  ;; false for non-intersection patches.
' ]. B3 I; i- U6 t; X9 U]8 v. }0 N& @4 f# d8 d  ~2 C; \
: E# S. }% T, D
. u0 @+ m0 O. B! o" c* v$ v4 W
;;;;;;;;;;;;;;;;;;;;;;. |  x! ?7 O; c) M5 ?; o
;; Setup Procedures ;;1 a1 W. B0 ]+ S& m9 F: L
;;;;;;;;;;;;;;;;;;;;;;
0 q8 G; y. P9 s. J2 E# H. t+ N8 n* p- N
3 u0 L5 _/ `+ E- }3 r( m! s;; Initialize the display by giving the global and patch variables initial values.
9 W- v0 w% Q( Z, B;; Create num-cars of turtles if there are enough road patches for one turtle to
7 h" ^/ x. V2 }5 B/ ~( m5 m;; be created per road patch. Set up the plots.
- P8 s. K. \# J2 `2 u' l5 ~to setup
  g* {8 z! k, X9 J3 }* {. D  ca
5 i- L9 I1 f- _0 l  setup-globals9 l8 d5 L9 ~5 F; y1 c4 m

* f# t% k- t1 u( d8 p/ \  ;; First we ask the patches to draw themselves and set up a few variables
5 _/ a% W  v1 t  setup-patches: Y/ W& |/ Z& m
  make-current one-of intersections3 S% L2 X! W7 R
  label-current
/ o; A; d  b5 U- N% `# [8 \
1 n8 r1 z: r: ]8 }; U  set-default-shape turtles "car"5 Z/ X8 o/ @7 r0 S: S

+ h; R7 e4 u8 U6 y, j9 t2 Z  if (num-cars > count roads)! F! v+ G* r7 {
  [
6 P! p, b" N; d( K. a( M( L' V    user-message (word "There are too many cars for the amount of "
: j" d7 R/ w3 C% @/ \                       "road.  Either increase the amount of roads "
3 h' `7 E4 n' `: |6 ]7 Y" l                       "by increasing the GRID-SIZE-X or "
5 \4 m7 Z- R) A7 d                       "GRID-SIZE-Y sliders, or decrease the "
6 {$ G8 w+ B7 h# I( I7 A5 S                       "number of cars by lowering the NUMBER slider.\n"
# n5 j8 [: U$ e$ Q6 P; X                       "The setup has stopped.")
8 |* Q* |# G' s. F    stop
3 H3 `7 q- B; V$ m  ]
4 U- T( c2 t5 b6 o$ m  g, k2 l- c  p5 j1 H
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( i+ T, @1 t- D  p2 m; B3 b
  crt num-cars- \, u  C) R- ?6 i+ A: a& c
  [
1 f8 \7 i: ^9 D, v. U5 d    setup-cars
4 b; u$ x, F( j: \  }    set-car-color
! b' x0 I9 l& y5 ]' R    record-data$ f' _* j  F7 R: W; m' x. @' Z
  ]( ^& ~" a. s; O, P4 V

1 H+ P9 g* o: H+ u. q8 `9 m) b  ;; give the turtles an initial speed
, K2 t- P7 e# T- W! |! C& z* d1 N/ u  ask turtles [ set-car-speed ]
4 ~6 _7 ?" F5 d$ j7 ~7 z
' j9 k: e) v8 @" K  reset-ticks, j- l) B' l: P4 C+ _
end
6 l3 B0 u) q+ ^3 ^+ w; {5 T: b4 I( ]* Q7 N) m
;; Initialize the global variables to appropriate values
+ O; |2 x+ t4 v! H. p* fto setup-globals
1 t4 }9 b! |, V' c4 b( E3 S  set current-light nobody ;; just for now, since there are no lights yet( v3 k& Q: h/ v4 {9 E$ o
  set phase 0
1 T! k+ j9 s0 h& G3 C0 X6 O  set num-cars-stopped 00 A% S7 y' G  k* s2 s9 T* N' @
  set grid-x-inc world-width / grid-size-x
3 U1 j0 C2 g0 Z. ^! ^) N6 m/ Q  set grid-y-inc world-height / grid-size-y
2 u$ G1 c2 x1 G& M. x" K% A6 h
( a% x) g4 k% k5 N! h  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary5 _: t3 u: Z3 [0 `* f
  set acceleration 0.099
* F7 f1 H( Q) L4 \end9 C/ ]0 G4 q- K( S" ~3 _2 p

6 z& k7 F- z( G8 P9 v;; Make the patches have appropriate colors, set up the roads and intersections agentsets,0 j0 K6 m% A4 ~6 I1 L7 d
;; and initialize the traffic lights to one setting
. u. ?0 o$ M! S, gto setup-patches
- M; k. R$ p) c6 g3 H* d  ;; initialize the patch-owned variables and color the patches to a base-color6 r  C* D: [" a$ S2 l
  ask patches
1 c  L! ?* r+ y  [
  `3 S. p: j2 t    set intersection? false
6 i2 B4 @$ u! Q6 b! x# f4 E$ i    set auto? false- j6 Z) X) m8 t4 q
    set green-light-up? true
. f2 I+ ?' V; S' n, A2 w8 [    set my-row -17 g1 i3 w  k; t+ t' S( m
    set my-column -1
! w. _  C% h" c; h3 D5 @    set my-phase -1
& L  Q2 F1 O! v0 [    set pcolor brown + 3& h9 [: D) h& ]! o( a+ f
  ]
0 h8 J) K; E& ?
2 z% c' _; D8 K4 C% w$ ^# J% j  ;; initialize the global variables that hold patch agentsets
" ~  k" G0 u  `1 l- d$ \* C  set roads patches with
/ L/ M1 |4 n8 j' J9 S    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 [% T3 o4 ^" F9 p    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: c% c' |- r$ v$ D7 ]$ S, K
  set intersections roads with
0 l) j# \4 C2 h$ D    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and! a; C+ `$ ^3 k+ p3 q
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- [, V# T1 `. t7 k/ u2 f0 N

7 Y3 W# v: @- q0 u  ask roads [ set pcolor white ]6 k5 ?# ]% t0 U& H6 h
    setup-intersections
$ I9 x0 Y. k+ {7 ?! B1 ~! Jend
7 u! t3 o* O9 g7 N& t8 r其中定义道路的句子,如下所示,是什么意思啊?
$ q6 q5 c) {6 S0 N6 \/ h4 i. W' l5 D set roads patches with
9 B) P/ j! V, k0 ]( a5 y    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 A7 T* u0 K* N) g
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# W/ R) ^9 O5 P  e/ x. Q+ E4 ]1 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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