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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。
  u4 A, g* u/ a; j' u4 Snetlogo自带的social science--traffic grid这一例子当中,
8 S, w! m. E/ K4 W- }$ N, G' L9 vglobals) V4 p/ x3 k5 Y  c% n: p  ^
[2 R; h0 V2 K/ s, p, {) P9 m, W
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
; j: r1 L4 V/ u* o- ?' _/ z; M  M  D  grid-y-inc               ;; the amount of patches in between two roads in the y direction
) Q: {  O" C3 ^- g  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
) \1 ~6 h* @( x1 B( N- |. l7 x                           ;; it is to accelerate or decelerate
3 X3 t7 q  A! S3 r) ^, Z( _' H  phase                    ;; keeps track of the phase' ~# d$ I/ Q# I% N0 u
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
( f. @  O! O% X3 _  current-light            ;; the currently selected light; D6 ~! ]5 d7 U- Q: m2 b

+ V; ?' x  Z4 z# k: m) N  ;; patch agentsets
5 h* k  _7 a% a% Q  intersections ;; agentset containing the patches that are intersections
6 ^  |/ ^1 T% T  |; g  roads         ;; agentset containing the patches that are roads
2 R4 V/ j0 Y# a  T5 P& p]
5 A, k! G0 Z. G& s. B& y  ?
( w1 B; b0 v9 N8 _8 V- Jturtles-own
. r4 E# R5 I; D2 B[
: f8 ~, @6 \$ F4 n* }5 ~  speed     ;; the speed of the turtle) R8 r$ a0 }6 X* V9 G; `2 g& p
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
4 C: D4 K& `6 F4 b0 }9 f* z; [4 S  wait-time ;; the amount of time since the last time a turtle has moved
& t. I# t9 i! t5 |9 i]
- y5 u) t5 Y: B8 ]$ U6 l/ z& ^
! I. \* |$ q8 h1 T3 E: Vpatches-own* `& a. b& s1 v+ @- J
[! s3 Q; ]. }# }+ @! p. P
  intersection?   ;; true if the patch is at the intersection of two roads
$ I4 |  V3 o( O  w0 S  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
* J  b: C4 F5 j9 A( I, {                  ;; false for a non-intersection patches.
0 S  t/ `  ~- \% Y& q  my-row          ;; the row of the intersection counting from the upper left corner of the
* V9 ]4 Y7 z) |1 _. y                  ;; world.  -1 for non-intersection patches.
( F; [) m7 Q" |; f2 {  s0 r. Q  my-column       ;; the column of the intersection counting from the upper left corner of the$ x7 k9 }  i) }: F
                  ;; world.  -1 for non-intersection patches.& b# m3 m4 j/ S0 |: J& f- @0 Z
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.; `. R3 z  `$ k- t1 |
  auto?           ;; whether or not this intersection will switch automatically.) w6 W; ]" F( F# f. h% w
                  ;; false for non-intersection patches.. T" I# C: p7 V/ N6 t5 Y! L; r* a0 @
]+ `0 l/ y. x/ k3 ]9 Z

4 O; t# W6 ?' L3 x7 R* u' l* s
$ V1 z7 M2 [4 q: ?2 _4 R# ?( E;;;;;;;;;;;;;;;;;;;;;;3 i8 P" Q1 ~4 \0 g* f; ?
;; Setup Procedures ;;5 j7 _+ S5 {7 M
;;;;;;;;;;;;;;;;;;;;;;
$ N* d9 @& G  |0 t, d( C2 _- S/ y+ t1 S9 e
;; Initialize the display by giving the global and patch variables initial values.
" a' t6 U% g4 K1 n; v1 i;; Create num-cars of turtles if there are enough road patches for one turtle to
, J, W0 s7 O/ U# L$ e;; be created per road patch. Set up the plots.
" V  n1 f1 ]: Yto setup3 R9 z, T* [# J1 j" R4 E+ N; x) S
  ca
8 t. R1 l* B. p+ K. \& x/ k# h  setup-globals
# k- \7 ~  O3 Y" m# p- `- z: _$ s2 }
  ;; First we ask the patches to draw themselves and set up a few variables
$ ~  Z, `3 \) ~; h/ O& k& ?  setup-patches
; L! m* s' _# i; `  S0 {8 H  make-current one-of intersections
" o9 X$ r( \, E# t  label-current
# j& ]4 R: C+ C) x/ v
5 Q4 R, o$ e/ @% a* D5 l' d  O  set-default-shape turtles "car"& L) B- s3 k$ q/ ~: A

) U6 y+ K# [& c2 w  A  if (num-cars > count roads)2 ]9 n" R1 j0 x1 p- q  K
  [% F+ M% Z$ o! p7 `9 p# H  Z
    user-message (word "There are too many cars for the amount of "
# x# g0 Y- X5 ]: c! x8 L# h  n5 q& v                       "road.  Either increase the amount of roads "
7 u: i' E, C6 A) P, |7 W" \; b                       "by increasing the GRID-SIZE-X or "0 ]4 P+ ?, x- X" }) I
                       "GRID-SIZE-Y sliders, or decrease the "8 q* ~2 c! V/ A7 P
                       "number of cars by lowering the NUMBER slider.\n"1 o. a2 G2 ?6 ?; H' |
                       "The setup has stopped.")
; @6 l/ c+ L2 o    stop6 ~1 D% u' d; n- d
  ]
. F) Y! Y. c& W4 Y
! ]0 F' n- Q* {; f! y$ P) [9 b* E  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color* ?% W  A8 Z( M3 M
  crt num-cars+ F0 i5 P. J8 l$ m7 k$ |
  [# Z+ N) J6 w+ g& z) Z. K
    setup-cars& r4 P# d1 o+ g6 k9 D" D% p
    set-car-color
: w, _, s: M3 h; f- b    record-data
! w  g( C$ q& Y  ]% a: R' `5 p) \/ Y6 Q& n( T" l
3 ~( k; j, b2 g2 ?
  ;; give the turtles an initial speed5 D; a! W; B( ]8 ?* @! x
  ask turtles [ set-car-speed ]( \) C4 p" n/ v, V. Z: F
7 y; T( m7 x7 x) d' R
  reset-ticks
" }9 c) v4 [8 p1 K$ I- Z: `$ R3 rend  `& O* L7 A" s

) i9 P9 L- U2 F' U;; Initialize the global variables to appropriate values1 s- W  ^8 o( B8 `7 N
to setup-globals
* d6 L  q; C7 m$ Q! R  set current-light nobody ;; just for now, since there are no lights yet
8 F# j1 r$ Q8 v. i1 k) ?' u  set phase 0
' ]+ c* K" [3 M' c( t7 b' ]1 A  set num-cars-stopped 0
! [2 d$ h. s' t" x8 R# ~  set grid-x-inc world-width / grid-size-x# m4 \) e9 w7 n6 h. k+ e
  set grid-y-inc world-height / grid-size-y
0 W' T$ Q  a  ?+ ]% H/ u6 K$ a! R4 n6 O7 k( @' f$ ]- `3 M' f  v3 u
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
( E# S. T( i4 e5 t' o  set acceleration 0.099& W& l7 E2 a' a5 m  J& I
end$ i+ n  L( N- X1 Q0 k

8 y7 `: B3 M0 B5 j* R  k;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
, p% m  a) G! Q; i;; and initialize the traffic lights to one setting
' p, c$ R1 F4 b! r7 Y: @to setup-patches, M- X, J% n& f
  ;; initialize the patch-owned variables and color the patches to a base-color
  V4 h, R4 z  L) ~7 z  ask patches: s0 z8 e2 O, E9 ~/ c
  [0 Q' _8 A, `3 @% [# z
    set intersection? false
0 c1 W$ k; D& ^    set auto? false
9 h$ S3 T% ]* j    set green-light-up? true; c) M) f3 h- X; q" }) T0 ^
    set my-row -1
( s( T1 c- I+ E. I7 J( p    set my-column -12 B9 v/ j# B+ e( {1 t" _
    set my-phase -1
' W' I9 Z* W6 d' }. o; w/ F    set pcolor brown + 3
. r7 w: j1 n/ G( l( Q$ D! j% |  ]0 g( b7 }% t0 r, ]! Z
1 k& [  e" P' A: v
  ;; initialize the global variables that hold patch agentsets8 [$ |4 t! k2 g3 S# I* o
  set roads patches with8 F# Y' ?" m: B+ ]& K
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! P9 ?( ^7 v# s: v+ M
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)], B/ q5 u# ~7 c0 w3 Q# E3 {
  set intersections roads with9 E' M" y* j! N1 r" t6 S) R
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and2 L" Q" X3 w$ L! R) s1 k" x
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) e- b- {5 h0 y9 y* Q

: p9 z  W6 N1 b  S. V6 d  ask roads [ set pcolor white ]% S$ d% S" u- d$ |8 O7 t
    setup-intersections% j- O# p8 A# ~  `
end3 J. S1 C; o. o9 `; R" A. p- k+ q! P
其中定义道路的句子,如下所示,是什么意思啊?- c5 f# ^: _) f6 K
set roads patches with7 b% s- {# F$ N0 B9 P) c6 D
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 E% M/ |0 H3 ]. _8 R) N! }' G
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! j# `; a6 R: m5 q% [$ 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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