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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。
) i) [  ]! z/ a3 r& Knetlogo自带的social science--traffic grid这一例子当中,
, {5 }" r! v8 j, G" t, q* Aglobals2 e7 y% q& E& i2 ~( N7 u4 A
[
1 J" y7 r  g7 `& {3 P  grid-x-inc               ;; the amount of patches in between two roads in the x direction
/ z$ l4 ]$ ?$ E& p3 }0 \$ F  grid-y-inc               ;; the amount of patches in between two roads in the y direction
0 M9 o4 b" i% N! }  acceleration             ;; the constant that controls how much a car speeds up or slows down by if, a: q0 @8 v+ H. `& u2 L9 p, S
                           ;; it is to accelerate or decelerate
/ `4 D# s0 v: ]9 S% l6 X7 }5 ?  phase                    ;; keeps track of the phase
8 ]: d! ~8 y! s% f6 j5 R) N  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure! m$ C1 q  @- x1 D3 o
  current-light            ;; the currently selected light0 l1 E+ l7 w$ @& R( q+ h

% w3 D$ c- V+ E: I& \, `  ;; patch agentsets
  l1 M. {9 k7 [9 u5 P  intersections ;; agentset containing the patches that are intersections
% u: V5 ]% @$ [4 @& O  roads         ;; agentset containing the patches that are roads3 X2 w% x4 n' w6 c7 e6 S# Q$ F
]
- x( V, U' l+ I4 Y7 p- T
3 w! ]% M- v2 h, h6 }: i) `7 Fturtles-own
$ A) O7 ?, r% f[! k5 |1 p. s+ ?/ {
  speed     ;; the speed of the turtle% m- F/ r  |! m4 U: y' a$ c4 h
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
6 `" J% O. r/ G9 K! _; p2 ^  wait-time ;; the amount of time since the last time a turtle has moved* @6 ^/ g0 }7 D* c8 e
]6 ?3 H5 |- n& V1 n

( q5 s( S7 b" i- Z; vpatches-own1 P& a- h; _% ]2 o" r3 D: _
[' L  @! N1 a8 x; v. [/ \, \0 Y
  intersection?   ;; true if the patch is at the intersection of two roads, L, ?) y- ]; T' z
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false./ x. @8 O1 Z0 M2 y% Z
                  ;; false for a non-intersection patches.
2 z/ v2 ^$ A) w; b  U  my-row          ;; the row of the intersection counting from the upper left corner of the
1 Q* N1 |4 R# X. n3 A                  ;; world.  -1 for non-intersection patches.+ |# C& f# k0 |( O( s8 h/ y
  my-column       ;; the column of the intersection counting from the upper left corner of the! c- r! A+ ]  V$ C$ K
                  ;; world.  -1 for non-intersection patches.; G/ t. T2 F2 x/ s- p/ }$ D& g( k
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
6 O( P$ W7 u" ^5 m. J  auto?           ;; whether or not this intersection will switch automatically.
) l8 b% P2 s& w7 F; Z) }                  ;; false for non-intersection patches.4 h) l& y# N- B& S  H5 |
]' s2 k/ ~3 k' i  f7 P! x& z/ C

0 g0 l! {) e7 \  u5 F: a0 C' e0 s- j- A' X; D$ |) ?
;;;;;;;;;;;;;;;;;;;;;;
# \# Y& l) n! U0 U* X' w! ~;; Setup Procedures ;;5 h( u2 g( Z' u; U, o$ a! i7 s
;;;;;;;;;;;;;;;;;;;;;;
6 w1 b& M# @( S' Q8 M! t) k: t% ?5 D  K6 _
;; Initialize the display by giving the global and patch variables initial values.7 n2 g" Q4 i4 a  y' ?& Z
;; Create num-cars of turtles if there are enough road patches for one turtle to$ i& ]! E: A6 k
;; be created per road patch. Set up the plots.
9 X5 |! q$ N6 R8 n- @4 N  vto setup
" T. r' w* r) \0 d2 z+ j  ca' h: n7 F0 M# `2 `* C
  setup-globals, w* f4 R4 S% o5 A3 h& Q
/ u4 R; ?' y8 d7 C
  ;; First we ask the patches to draw themselves and set up a few variables* l9 k( `, l5 U7 _& n% N1 y: f
  setup-patches
3 D# q" O# |1 \. o  make-current one-of intersections9 |5 n: |9 |( D
  label-current) q- q4 J, ]! P: Z; q
8 q, L" I- e4 l% W
  set-default-shape turtles "car"
7 l9 \2 I* s9 ?) M- J. o5 n8 L1 J# w6 w: _/ [% ?+ }5 E$ a
  if (num-cars > count roads)
' N, Q. W1 ?/ ?2 v1 Y  [# @5 L* P! T' G! ~0 i
    user-message (word "There are too many cars for the amount of "- I( a5 h: j1 y2 A1 Y0 p! l
                       "road.  Either increase the amount of roads "" v* D6 @) o3 R& n
                       "by increasing the GRID-SIZE-X or "
1 R" l" {+ m) u                       "GRID-SIZE-Y sliders, or decrease the "$ _! o$ x2 u9 |
                       "number of cars by lowering the NUMBER slider.\n"
: i+ }7 E0 u5 Z2 J# f4 M8 v. C                       "The setup has stopped.")# [+ ]; T5 J% A" v& w: S9 A8 S
    stop, r/ `+ `* }# \) f- l
  ]
  g4 A% {" P( T0 y4 P  R3 O* G: T6 ^2 m* W+ Q4 E. b9 j
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color" o, b' e' o; |
  crt num-cars
) E) g5 u. p; ?  V# {1 S  [/ j! S5 D8 J& F9 E9 p
    setup-cars
- h! Q( c+ R! V/ ]: Z  F    set-car-color. C  V, c4 E2 z+ j) S$ \  x+ I
    record-data
# S6 t' f4 Z7 O3 U+ k2 B$ e4 O  ]7 R& v% H5 k1 G) {- z) p; c

0 l6 }+ i0 j3 w. K  ;; give the turtles an initial speed! Z% _0 I- F! x/ k! I
  ask turtles [ set-car-speed ]/ f9 L& n- K& v2 g

$ o2 y( L, p, ?8 [1 x9 e/ |  reset-ticks
6 k% j. E4 ?( a9 G1 Cend9 C0 d6 H" Y# p! f4 ^9 \

( S- E4 @$ s% D) }# F;; Initialize the global variables to appropriate values
; }8 `% x) [5 B& sto setup-globals: M8 u7 ^0 a5 j) E# i: a
  set current-light nobody ;; just for now, since there are no lights yet+ p8 w. S" ^4 h7 p6 M* Z! O8 x
  set phase 0# @  }8 l; l- q& X
  set num-cars-stopped 00 f/ y% J* ]0 i: O
  set grid-x-inc world-width / grid-size-x
; S0 e2 N4 W0 C. }( O6 Q  set grid-y-inc world-height / grid-size-y. N% I+ W* M4 |; i

  q+ y0 s0 x6 _! U! K6 E  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
2 e, N8 |1 v1 @4 v- c  set acceleration 0.099% j5 r5 h4 |& C
end
+ C" y- R0 L4 @: e. N0 k) e! y/ N( H2 O( f; d" T# `
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,; z8 g& O% q- Y+ {! T  _
;; and initialize the traffic lights to one setting. l2 z! K. g: d. Q7 t
to setup-patches
! x3 ^  B/ B+ M3 U  ;; initialize the patch-owned variables and color the patches to a base-color8 q/ `( o7 G6 ?/ w2 u
  ask patches
8 g% p) d7 f, v% F0 x  [
( q" D" p/ {$ S# F* f2 a; N    set intersection? false
: m2 K/ ]5 |7 w- o7 O    set auto? false" i. t+ e. ]$ e- M  C
    set green-light-up? true" s& P: b2 e. K) E
    set my-row -1
$ M: L% h$ E: t9 k+ ?    set my-column -1' J+ s6 N* h/ y' ~( T, Q
    set my-phase -1" t& `# m" r5 @3 E3 Q
    set pcolor brown + 3* }! H5 o6 d0 T  o2 E7 Z
  ]" q! u, a8 j1 n# W: X
& H& V: a# K1 f6 k# f
  ;; initialize the global variables that hold patch agentsets
1 l3 I# z8 e: B: h8 d" h$ W. J  set roads patches with/ t  @9 }# ^( B$ u% B
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
  n5 v' J* {5 y    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 K1 x+ {! g8 X+ {! Q! R( R
  set intersections roads with
! t  u- Q, I& y# a    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
1 {8 @' l- B0 _$ {" L6 w- Y& N    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( p& V: B6 B; M; d
- M1 o; y6 m/ t) }+ `
  ask roads [ set pcolor white ]; T- P, {" k) ~& W
    setup-intersections  X- u1 o# k' O
end0 s( j6 j' l- ^9 n  `; l, n. L! _
其中定义道路的句子,如下所示,是什么意思啊?2 o/ C; }5 f$ r
set roads patches with
; ]8 w2 w3 e0 {; o6 b) x. Z2 |    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; B1 `' ]" V" R2 c- \, R
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ d3 t+ G+ X  N/ w% n" w* B
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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