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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。$ ]- f7 y4 b  F8 v8 P, k
netlogo自带的social science--traffic grid这一例子当中," n* o* H, @6 C+ I6 _
globals& y1 r% I! T% O9 u
[
! n  F. O8 x  C& I' j  grid-x-inc               ;; the amount of patches in between two roads in the x direction
$ [  d$ Y8 Z4 O  grid-y-inc               ;; the amount of patches in between two roads in the y direction8 F. Y( @% ^+ O7 j: F# j$ [
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
1 G+ D) @9 c9 U, q; J3 _8 K                           ;; it is to accelerate or decelerate
3 A2 |  E' [4 r: ]( @7 o  phase                    ;; keeps track of the phase
* [2 A3 [. d! h2 J" L/ l/ A  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
6 x' ]' i9 l- g3 K+ g2 X7 C, u) _  current-light            ;; the currently selected light1 l$ c* k2 I' ]) e8 b5 h

8 x% S2 i( \: p8 t8 y  ;; patch agentsets1 J3 b6 T" L- `
  intersections ;; agentset containing the patches that are intersections6 _# L/ [; \  u( p
  roads         ;; agentset containing the patches that are roads
+ a( X  K) b8 C# }/ I$ u]2 z; s# d- z) s/ J( a+ x- O1 y) Q
3 q. L3 ?3 k2 u5 q& B
turtles-own
6 ?# J. l4 K/ V& u7 R[
# }# c5 h; d; x+ j  speed     ;; the speed of the turtle5 W$ A- w6 N5 l6 L: Q
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right: [# d! i. W3 j# L$ m5 E, V
  wait-time ;; the amount of time since the last time a turtle has moved
4 Q3 Y+ D. h; X# q" |]/ {6 u. x! N- X

+ N" f" W, A0 _7 E1 c# `8 qpatches-own
9 S% c% ?& o( |. E[7 S2 ~- k6 L+ j2 t
  intersection?   ;; true if the patch is at the intersection of two roads. a1 K5 j5 ^* z! ^2 w- L
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
. f. K4 W" r! u( e                  ;; false for a non-intersection patches.: W8 p. [/ e+ @. N9 U7 F
  my-row          ;; the row of the intersection counting from the upper left corner of the
. X7 [) ?- T5 U                  ;; world.  -1 for non-intersection patches.9 P: K3 X& \4 W+ d
  my-column       ;; the column of the intersection counting from the upper left corner of the
* _, O  V- d: O                  ;; world.  -1 for non-intersection patches.) ]2 A7 m% m# Y6 V! \5 q
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches./ _% h/ |' h/ t# Y1 j
  auto?           ;; whether or not this intersection will switch automatically.. W- [! t( Q' `( E; R, l1 \" Q6 f
                  ;; false for non-intersection patches.
% i; k8 m3 u. F' O$ n4 ^) f]
8 u# l* E$ u, k- ?: f2 n7 `; f* y5 a. k9 ^- z

6 h2 q# t1 _. y, R/ G* y;;;;;;;;;;;;;;;;;;;;;;8 c$ I. m. }1 r/ N2 l2 C0 S
;; Setup Procedures ;;
) H- W2 D! L; _  u2 I5 y4 a;;;;;;;;;;;;;;;;;;;;;;4 r# R  ~! A7 q, m: \5 T
' A2 h6 e0 G% {
;; Initialize the display by giving the global and patch variables initial values.) s' t3 C3 m2 ]. x
;; Create num-cars of turtles if there are enough road patches for one turtle to
1 e* |7 n9 e( [9 O;; be created per road patch. Set up the plots.
2 R  U2 P3 G& i' `to setup
; [1 q8 T, Z0 c/ [  ca
# d9 S! \( X0 S# e' E3 ]  setup-globals0 _- ]. d5 k4 m/ J: @: H2 ~8 R; S
  u8 e6 w: P) }2 D7 L+ i9 v
  ;; First we ask the patches to draw themselves and set up a few variables. |1 C' g: l( ^  @* z
  setup-patches" N3 t( {) f+ G9 l3 r
  make-current one-of intersections
2 G; b1 \& M/ G5 |1 A" Y8 G  label-current
$ z6 K- |& N, w% t: r' U! M: F9 J( c2 v  v6 J
  set-default-shape turtles "car"
+ J+ b; {# X( {6 \: |' i, S
8 I5 {+ q) Y% l( C  if (num-cars > count roads): H+ F3 m$ @+ h. t* q
  [5 z4 R7 s! q0 p6 F4 r: U* d9 a
    user-message (word "There are too many cars for the amount of "
. K5 _7 _4 \, E                       "road.  Either increase the amount of roads "
, ^! w4 E2 ^) n! [6 {! ?- {; W                       "by increasing the GRID-SIZE-X or "
' f1 Y1 K5 G$ \3 F& a& }) U% p                       "GRID-SIZE-Y sliders, or decrease the "# Q4 }, z* n( r3 {9 O( W- k6 ]
                       "number of cars by lowering the NUMBER slider.\n"
; h8 n$ U" ]# f                       "The setup has stopped.")
0 O. ]& Z0 A4 O7 t# J0 P! p    stop
, r5 J2 s1 V1 F/ X, N# q  ]
/ S- i- x6 T2 t
; [; n6 t, [# l* t9 b  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ U- R4 V: u& B
  crt num-cars
" m# H: B( A1 B6 Q2 m' D  [
/ ?7 g0 X4 A7 [% v5 H* }9 R    setup-cars
# B5 y/ Y( N" a+ ~( |' a    set-car-color0 {: c7 e: f8 i( C% D
    record-data: t8 C3 m, m) A( b+ v
  ]
. i1 H& N: M+ w& U7 g) N
+ U" _; L4 n% E  ;; give the turtles an initial speed
& P2 }  l# g: g0 D. v& o8 H* c# F  ask turtles [ set-car-speed ]% A4 r/ @: @% H
% k% j) S* N1 x
  reset-ticks9 o! ^! e1 @9 w9 o7 f) j
end
. Q' l- b& V7 {) B1 H8 A. K- G7 j5 T8 l( b9 U! l- h
;; Initialize the global variables to appropriate values
0 E  u  {, n9 e0 L% v# Yto setup-globals
' b7 O  S4 F/ e' T  i: O  set current-light nobody ;; just for now, since there are no lights yet+ k% M: V$ I% I& M0 z; N  ^
  set phase 0
1 f! b- [) `" [; E+ f  k& L  set num-cars-stopped 0
. a0 g5 p( L* X$ b  set grid-x-inc world-width / grid-size-x
. X6 m8 z0 r/ s; [  set grid-y-inc world-height / grid-size-y
6 T5 r# @, p, [) J0 n
* P2 g1 x% V6 `3 \  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
3 C/ M' I0 t7 \! g" d) d! U  set acceleration 0.099
% W  i2 E* m, [5 @, Hend
1 |3 C/ K5 {5 E
  b. _; O5 r/ o;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
! V( [7 _/ A! v/ p! S;; and initialize the traffic lights to one setting
( w/ |  a% S  y3 @. r+ F* X2 \: Jto setup-patches  ]3 ^% J% z  x/ }% `- w. W( Z- P
  ;; initialize the patch-owned variables and color the patches to a base-color
$ n# N! L+ M0 Y! h5 b' j6 }  ask patches3 O' x# e( @) M2 D9 ?- m& K8 s
  [2 i, c$ A, r6 `3 E4 g8 V' ?  e
    set intersection? false
  J/ X5 v9 G! W0 ?5 ]/ z    set auto? false
( \: U/ I2 F7 d- N$ s( t    set green-light-up? true
4 n( Y- @% |6 G2 q    set my-row -1
5 D, S8 C: }2 N# o# V' l    set my-column -1
% p  _0 C$ |) K0 U- }. s7 S    set my-phase -1% J" n) ^! D# u5 B8 k2 V$ D
    set pcolor brown + 3
, E1 g$ O2 I$ V/ y  ], N5 c" B  e, X$ U3 B- `
  a3 W6 @& u! V2 j: ~; _
  ;; initialize the global variables that hold patch agentsets
4 O8 J8 o9 `% ]( G+ s$ g5 N2 @4 K  set roads patches with9 V, V% o" b, W% E& _+ ^" z
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ \4 n3 e; ~/ U1 }; U    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; e+ z8 F8 ?2 ~8 }6 [$ x5 |7 [' Y  set intersections roads with
- d, {8 l1 Q. ]% l  ^    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
# {5 ]% l  O' ~, l! ~    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- V/ ?* n, n8 f

: U! a, k+ R' M9 u  ask roads [ set pcolor white ]
5 ]5 v9 o% A- C* R& |8 f7 K3 m    setup-intersections
$ h1 O& G7 x# t$ uend) v+ F, m% N6 H5 b
其中定义道路的句子,如下所示,是什么意思啊?
' s: g3 ]2 y. Z  L4 J set roads patches with# u% N# `0 d0 x- Q! A
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# J4 N7 P. {$ u" y# B4 N" N  b$ N
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# @% d2 W: y7 W8 ~
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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