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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。
0 N. z! z& L- onetlogo自带的social science--traffic grid这一例子当中,
& o' W9 @4 C8 k; A6 k& {globals
6 u) o% z& e; v* b2 o[- ~2 a- k  y  `% \( Z
  grid-x-inc               ;; the amount of patches in between two roads in the x direction/ b; Y7 X1 ~0 q5 |- f
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
4 n1 X2 F2 c2 ]* F% X2 m  acceleration             ;; the constant that controls how much a car speeds up or slows down by if# R" j  y% A3 G4 o
                           ;; it is to accelerate or decelerate- @' d8 W- b0 h5 {: C
  phase                    ;; keeps track of the phase
3 f. `8 g1 ?- g( T2 O' j  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
, o% z$ z$ y' V5 m- v! J  current-light            ;; the currently selected light
2 ?- ]2 w* |2 j' k6 {; j- ^1 {. S+ S
  ;; patch agentsets
5 n7 p1 d) h% u0 S- f" c+ f  intersections ;; agentset containing the patches that are intersections1 x( c2 w7 [7 |/ z+ N. G
  roads         ;; agentset containing the patches that are roads! d% M! U2 a6 u3 g/ D  {1 N1 A* |
]/ x1 {+ n; F4 R) z# z, ^
, v- f* a' ~4 T3 z
turtles-own
+ m4 o  n- ~, ~( R9 r" S[$ j: v% o. _. s( O( |4 X0 p9 t
  speed     ;; the speed of the turtle6 I% H" |, c# H% o6 C% u1 }2 j! ^
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right; {. @9 c" F3 Y7 H5 v
  wait-time ;; the amount of time since the last time a turtle has moved
6 I( {4 A+ V. l) y3 b( P]! n0 n$ u" T( `6 F2 S  ?/ f9 x

4 v, M+ K1 e8 i% D# Y2 ppatches-own
  b& U5 _7 W9 N( P[
) X2 |5 K5 g/ V/ f1 p7 \! C% M  intersection?   ;; true if the patch is at the intersection of two roads/ R! k5 |9 N* J+ z  c2 N1 `; _
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false." u$ w. u8 O" w; a& W; q
                  ;; false for a non-intersection patches.$ J; ^1 u- {) y1 Z& q5 l: i3 H3 \
  my-row          ;; the row of the intersection counting from the upper left corner of the
& [6 q) X; L" k& A                  ;; world.  -1 for non-intersection patches.' X! l. p# I( Y/ c+ {3 @2 ]
  my-column       ;; the column of the intersection counting from the upper left corner of the
; A! b" c2 S, H3 Q0 g5 W; m. Q                  ;; world.  -1 for non-intersection patches.
+ G/ [1 l& f3 o7 \  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
/ G6 p% a& Z; S# \4 ]  auto?           ;; whether or not this intersection will switch automatically.
; |. H4 f+ {. i                  ;; false for non-intersection patches.0 D$ s1 d  I( z: x
]
6 `$ ^" t$ ^* q: _, _9 [4 G. @9 N* K& V6 I4 o  J0 i3 Y3 t

" m* v$ P9 n; h3 A8 T7 Q) {;;;;;;;;;;;;;;;;;;;;;;1 Q: V. q) I' Z" G
;; Setup Procedures ;;
) N2 @' u( d3 F/ R$ x2 i8 j  A;;;;;;;;;;;;;;;;;;;;;;) y0 [1 r% \9 k9 S5 Q* q

# f% I8 ~6 i/ [. [' D& ^& Y& r1 A;; Initialize the display by giving the global and patch variables initial values.
' B3 N( `( P" y7 _: k;; Create num-cars of turtles if there are enough road patches for one turtle to
% ^4 N& O7 N4 e! F9 ?/ q;; be created per road patch. Set up the plots.
4 U: J) q6 g, }+ D7 ]* _1 r2 t" ato setup
  d+ v2 K& t& S  ca
. i2 p% ]! }" h2 E$ i# p/ R" p$ l  setup-globals
. `0 g# u- |) ]; N9 a
+ a) f0 r' Y: i# E! i3 m  ;; First we ask the patches to draw themselves and set up a few variables  p4 g9 F1 r* M$ h% i
  setup-patches) p% r5 W8 f& g! r5 [1 B
  make-current one-of intersections$ z8 o, Q# z( @! h" ?" A
  label-current8 ]  X+ B7 y5 e! @; K

! ~6 I1 H( W% h% x% O2 {# v  set-default-shape turtles "car"2 H. _. G- z, j, x0 n3 I; r/ w9 J

  ]+ ^" R$ {- O* [( l  if (num-cars > count roads)
) U% Q! a1 T# j1 C4 x$ `  [) Q3 F1 w% R( \9 {* ^. U
    user-message (word "There are too many cars for the amount of "0 ?+ D. P# H0 f/ X8 J
                       "road.  Either increase the amount of roads "
* Z& I0 S+ \$ ^; u; b                       "by increasing the GRID-SIZE-X or "- B1 `8 E8 [1 j+ t4 a5 A
                       "GRID-SIZE-Y sliders, or decrease the "
; z5 y0 r) D6 e* w- }! C; j                       "number of cars by lowering the NUMBER slider.\n"
3 T: B, z9 Q! l& d4 o                       "The setup has stopped.")) L8 D* J+ f' E% B; J
    stop
) F6 A7 f9 a! j% Y8 e4 r0 ~  ]
6 E; E! x, t2 Q; i" J5 I" l- P* p" F% ^& o& S
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color  _+ w. F7 I, k
  crt num-cars
* l, P) Q! c; [( j5 q  [
# g7 `9 `1 X6 y4 U    setup-cars
( g7 d2 O: T6 L* [    set-car-color
0 K3 X/ ]6 E& _. R    record-data
$ h. z. b5 e1 {, K  ]
1 I; w4 K& ^9 G7 q- U  b8 V: s; _1 Z: |7 \% N4 }
  ;; give the turtles an initial speed
' g+ {2 e* y# T, h  ask turtles [ set-car-speed ]/ ~9 ], D$ A4 e0 F) I% t
' s! L4 k6 _7 D# X
  reset-ticks" x" f# k- ?/ `& S: m* a
end
2 ~5 {6 k. N3 g' f$ J+ Q; u% l9 N2 t9 a: d5 W- a
;; Initialize the global variables to appropriate values8 U% x6 k; B! z: q/ ?$ t; U+ L
to setup-globals
- P% Q' Y' M4 p0 i8 r' p  set current-light nobody ;; just for now, since there are no lights yet* v9 i) I6 q# T# y, ]3 Y8 _, B; e
  set phase 0
5 c  ^$ j: ]6 h7 V  f  set num-cars-stopped 03 M9 v$ l" I2 \( t
  set grid-x-inc world-width / grid-size-x4 c' y2 w$ f+ x) [( k6 [# y
  set grid-y-inc world-height / grid-size-y9 O  h3 I; w' p3 b! e8 N0 \! c
- L$ p* M1 Q! S1 i! t# W& w+ b6 e
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary2 A, |* p" o/ i2 k% i
  set acceleration 0.099
4 w4 N- [5 a& K) {2 j9 ~end$ ]0 {6 ^, C: J% y

) E4 g; n# ^% k: B4 L1 Q3 X" Q: Z;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
8 [3 `9 T/ G% L( t2 \5 c- o' Y;; and initialize the traffic lights to one setting
0 F7 Y/ W) g5 c" A6 W2 Z" I) _3 Tto setup-patches
6 T5 P  ]& O6 m7 p* U" U  s( l  ;; initialize the patch-owned variables and color the patches to a base-color/ {& H6 _1 T) q( g8 ?' C% R
  ask patches* j8 s/ N$ K6 W1 k
  [7 l  J8 F. x( z$ a
    set intersection? false- D* O, G2 Q/ E- B% f+ M$ C6 w
    set auto? false; m# k( M. @/ j) c' ?
    set green-light-up? true
3 X7 K& I# M6 M  X: ~3 F    set my-row -12 d+ F% f; n2 V% K7 p
    set my-column -1
3 |7 z* P* w  c7 J$ s0 X    set my-phase -1: j5 S5 ~  x/ m# F! d/ E
    set pcolor brown + 36 i$ i0 q0 y+ ?4 q. a2 H
  ]* ]9 c* p5 O  h& m
+ M( J% T) k, Q( N
  ;; initialize the global variables that hold patch agentsets
4 k1 n! n) G$ `0 {3 \+ V# J  set roads patches with
& R; T# K  E3 p4 f( w- m    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 R9 j& K( }( I3 b
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- M+ M! f5 E+ E% d( |# }$ L: F
  set intersections roads with
# g) d; v( n5 U    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
; O2 X- E  X% c. G# m    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# {5 A7 b+ W, J7 `  n. @
  Y4 O0 Y8 n; Q7 n! a2 R
  ask roads [ set pcolor white ]8 u; Y9 q1 {$ B/ t/ O$ b5 x
    setup-intersections
' n/ q9 i4 E1 T# Send
& |- T. a4 P- X- A0 @其中定义道路的句子,如下所示,是什么意思啊?
) {* L8 e% m, o3 b; O1 t% M+ p6 t" J set roads patches with
6 R# e/ M- G+ \" M    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 B2 e8 F8 s( o9 a4 D5 [- r3 K
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ S) P( M, C% T; M. _2 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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