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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 d) W0 r6 }; V( z% Hnetlogo自带的social science--traffic grid这一例子当中,  x+ @/ m3 v  \4 d8 i/ S
globals, K* j4 c5 h) L  q% G* V' h( v
[% }2 h& Y; Z2 M4 h, ?
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
& r9 Q8 {( v' d% U1 w6 O  p  grid-y-inc               ;; the amount of patches in between two roads in the y direction& z* B6 I- U) ^& e
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if6 I4 G; P- d4 ?2 z0 x  z, I. [( R/ H9 i
                           ;; it is to accelerate or decelerate
: T1 S2 c4 w5 [: X2 ]$ H6 [( ~  phase                    ;; keeps track of the phase
. e% t" Y: D6 D2 D  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
' O  w+ {% z! F# V# r, O  current-light            ;; the currently selected light: @+ Y- C0 ]: P
' R" v% \0 p, ], m. Z
  ;; patch agentsets
* u  A8 L& {5 u: O: R  intersections ;; agentset containing the patches that are intersections
; z$ v& U. C. c' B8 |6 H( q+ H  roads         ;; agentset containing the patches that are roads& Z' Q$ v3 X/ L* K" N8 Z
]5 E7 C6 M! K. K- }8 J

/ o8 }8 ^4 q4 t. Rturtles-own8 Y7 t: q& a' o
[
. V+ I( {$ y6 q" W, b: \  speed     ;; the speed of the turtle; d0 b, Q5 S7 t/ K  c" n
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right7 c) M9 [8 B( O, o& l
  wait-time ;; the amount of time since the last time a turtle has moved) m# ?# [5 K/ l2 I9 E0 N. K
]
( P+ M  {3 \& r! @7 N
, k/ c, a! T2 Q4 x$ Apatches-own* A- [9 W& s- v% Q- a
[
. x, C7 A9 H) s& i  intersection?   ;; true if the patch is at the intersection of two roads
3 [" v* H+ p& q5 a% C: w9 i  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.4 N3 i* |7 w% v" c5 T' p1 F/ B
                  ;; false for a non-intersection patches.
, }. N& U, h( Z9 V! C( l  my-row          ;; the row of the intersection counting from the upper left corner of the
; ?7 P8 O, m+ k0 h& W$ b4 ~                  ;; world.  -1 for non-intersection patches.( s6 H. g% L+ z+ I
  my-column       ;; the column of the intersection counting from the upper left corner of the# r" `- h5 p7 V* B3 I; `
                  ;; world.  -1 for non-intersection patches.
& A0 q1 j0 ^% ^8 P5 J) W! ?; c) T. v  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.) u/ C2 C9 \+ Y0 \  j; \% F
  auto?           ;; whether or not this intersection will switch automatically.8 ~% ], W- d9 B+ O- f3 g
                  ;; false for non-intersection patches.: I, c8 r7 g4 z& H
]6 I/ e! ?, ]7 j1 D
+ U% `( ]: d& n& K

* c, c, S& l, _/ Z' };;;;;;;;;;;;;;;;;;;;;;
2 ~, p, A3 W/ ~' `8 E* n2 v;; Setup Procedures ;;
9 t; R' g: u5 O. f# d0 Q;;;;;;;;;;;;;;;;;;;;;;- K9 s8 {) Y7 Y- y* P  C8 b1 H

6 E9 K, j- @. X+ e2 l6 n) h;; Initialize the display by giving the global and patch variables initial values.5 q- J9 E" o7 T* t8 f2 n
;; Create num-cars of turtles if there are enough road patches for one turtle to
' U4 O% T1 \8 x( N" |* a;; be created per road patch. Set up the plots.  Z( p% R4 h- S( ?
to setup0 ]0 ~3 J$ \! v" G2 O6 K. [7 C* S$ d
  ca4 A* n. B1 |; F, F
  setup-globals
2 ]- y/ U7 h* }3 M3 ]% F' Q; n8 F# A4 ^
  ;; First we ask the patches to draw themselves and set up a few variables
' T  s) T$ C4 |- e) o/ ^  [( ]  setup-patches
6 L9 S3 u+ ~7 n5 o  make-current one-of intersections& X& K+ Z( O' F# e
  label-current
$ C9 {* H, t) d3 ?9 r' Z* c) o
  set-default-shape turtles "car"+ }6 f" i4 _) M* K. ^
! C) Z' S  x% J/ h
  if (num-cars > count roads)
- o' n  o/ f8 s: G6 z  [
7 i$ H, w" g6 x5 a* s    user-message (word "There are too many cars for the amount of ". d- |4 a. t7 y# c& [( ~
                       "road.  Either increase the amount of roads "
5 x, i0 T7 M) u' i9 l# I                       "by increasing the GRID-SIZE-X or "1 S* h1 j/ g( r
                       "GRID-SIZE-Y sliders, or decrease the "
0 z4 Y' X5 D1 c- V/ X9 x( r                       "number of cars by lowering the NUMBER slider.\n"
2 S# }5 k' [: z- K# |$ Q                       "The setup has stopped.")/ j; f  F7 w( q
    stop! j9 `. P. \* p# \6 X7 \
  ]
6 g; U. b1 s5 g/ U' U. @# G& S
4 g/ |: b- S8 w2 ^$ t  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
! U% r% x( _7 h6 C5 ~1 g  crt num-cars! i( J" _4 U' y2 t: u/ Q/ j
  [
" m% R- z" F: N2 d9 Z& U    setup-cars4 \; \8 s, l2 y8 Q' U
    set-car-color) q/ Y2 |! E! ~4 i
    record-data
! W- n% E8 t. Z% S# t" z( F  ]% ~) N; n+ ~4 I% T& m

7 d$ a: q: g7 I# {4 l  ;; give the turtles an initial speed! f% D% ^, G: \% N
  ask turtles [ set-car-speed ]
. b" @; S. R* Y4 }
0 L2 o( a  r5 y/ j  reset-ticks
  A. |- W9 N/ D, ?! B$ send+ p- p: a1 K! L$ c/ R

, a& f. ]( y+ g$ U- k4 V( w;; Initialize the global variables to appropriate values3 ~8 F% x9 Z7 T9 `' |; d: `+ K
to setup-globals' A$ Y  m6 a4 U; W0 ]) M& t
  set current-light nobody ;; just for now, since there are no lights yet8 H4 S# }3 ]/ _3 x( [
  set phase 0
$ G! M: c7 r& G& Y) l9 D  set num-cars-stopped 0
/ a- i7 `/ @0 ]4 [  |! j; ?! y  set grid-x-inc world-width / grid-size-x
; g$ S0 u  K1 W) s, S) r! H! K  set grid-y-inc world-height / grid-size-y
- g8 A; D! v1 H- P5 \/ a
, Z! @0 z4 Q( q  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary- G7 U1 z# X" P
  set acceleration 0.0995 n9 r* x0 E  ^+ n5 Y( l- G/ g9 {
end0 y6 {9 G, Q( Q- F
# n/ g& p9 `6 ]) q: K/ ~' M( M
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
1 w9 P- q/ h& F, K/ d6 e4 m2 |;; and initialize the traffic lights to one setting
% W8 l: n( f3 Y& a% Dto setup-patches( U2 A/ E4 j0 z  |/ o# L1 R
  ;; initialize the patch-owned variables and color the patches to a base-color
3 [3 S! p; h4 [  ask patches, _1 z# E5 z% `  W0 B
  [
$ e/ J% a5 e" z: E" Q    set intersection? false/ H/ {- f! K# {# Y& D
    set auto? false! @% D( C) N) f: Q2 T$ `7 j
    set green-light-up? true& U' r% d: N" Q6 `
    set my-row -1
: F, y7 @9 z$ _    set my-column -1
) E" _* N# v) k5 F; i) V    set my-phase -12 n$ F* P: i* H' ^
    set pcolor brown + 3
6 I+ o; T1 U' m# t  ]8 R) Z( R( X2 c7 j1 q+ ]! e

+ R7 l2 j$ i3 X6 m9 b. t/ F  ;; initialize the global variables that hold patch agentsets
9 L: j4 E/ {) w. F8 o  set roads patches with# q8 r/ c) U9 ?: @7 w7 Y2 s* c
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 E8 W% ?; J( A. p2 p& w    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& E% q+ ^! H/ F$ L, U, K. B  set intersections roads with/ h0 X) C* ?# m/ G- f- M2 j
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and2 x( K4 ^7 B* I2 O. j, y
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 {& c! g# t* y* C4 f2 A3 m/ [& i+ F+ H) V* E- J! W
  ask roads [ set pcolor white ]
) i2 A- {3 E5 U; l3 z" j, ^    setup-intersections
( c% L# U; F5 T' {+ I! r2 I& Bend
- i+ Q& c# k  U( w4 v8 x其中定义道路的句子,如下所示,是什么意思啊?
0 s. ~6 n8 ~0 \) A+ `6 X2 ] set roads patches with
: J! f" n3 \/ s4 N+ V    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& E! ?0 M- N+ ]
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 X7 f' J" o! a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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