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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。2 s9 o" Z6 o0 b" {$ c; Z7 d5 ~
netlogo自带的social science--traffic grid这一例子当中,
3 g/ t' e" e: Wglobals
, B# R8 G# u: Y$ X( A0 P* F3 A; _[
4 ^% ?6 R- f% \. o( @; S  grid-x-inc               ;; the amount of patches in between two roads in the x direction3 h4 \1 Q0 W' I3 p2 [6 `4 m
  grid-y-inc               ;; the amount of patches in between two roads in the y direction' C" C; A" D) g+ [/ C: x2 K
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
7 p7 p+ G2 c+ b  V  i                           ;; it is to accelerate or decelerate
  M: U3 ^" W0 _% W# `( Y  phase                    ;; keeps track of the phase. X! z: V+ {( G0 _, l+ o
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure$ O0 i7 k* @& X6 n
  current-light            ;; the currently selected light1 D1 X  N1 W% F+ Y  K# G
3 F) k; ^/ Y, W
  ;; patch agentsets
$ L, G* c6 s0 y, g  intersections ;; agentset containing the patches that are intersections
7 ]# I& j, f# t  roads         ;; agentset containing the patches that are roads
& D8 z+ a" t0 Z" {]
: f1 P! l2 w) p* ?4 `- R  ?; ], Q5 \
turtles-own& ~+ ^( j) N& k9 q8 @
[" }$ ^+ I8 ~* g/ v4 c
  speed     ;; the speed of the turtle
( U  G9 D4 q1 s% V! L! q8 P1 H  up-car?   ;; true if the turtle moves downwards and false if it moves to the right% r7 w7 B. d$ p6 }- e9 o8 M) J- u
  wait-time ;; the amount of time since the last time a turtle has moved
$ L4 y. ]" T% i" q9 ^' |0 F% I]
& }$ i" ]0 L3 A0 X9 J# n
, m  [  ~' H& ipatches-own+ Q. d8 e2 C) N9 _; ~
[
4 r* I7 O. w( \) {# \* @  intersection?   ;; true if the patch is at the intersection of two roads. X9 p# V+ i' p) l9 _
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
) s2 H1 f# f* k& x+ D                  ;; false for a non-intersection patches., G8 e0 O! c. \2 E/ o
  my-row          ;; the row of the intersection counting from the upper left corner of the; H. v' T+ f! ^' b/ f3 u8 x/ n
                  ;; world.  -1 for non-intersection patches.
% H4 @" W- r, M, \0 Y  my-column       ;; the column of the intersection counting from the upper left corner of the! @" S( U; z3 {8 I' J
                  ;; world.  -1 for non-intersection patches.8 b3 d7 `- P: ]- r
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
: N) b' B( @* ]1 d/ a$ @  auto?           ;; whether or not this intersection will switch automatically.. H. B5 }. T. u( Q
                  ;; false for non-intersection patches.* j9 x- C( _! ~8 }8 Y3 [
]0 f# Z5 i0 T) w; T
4 R2 W- b# c" G( M5 @$ a/ ?
$ @" z1 F3 T5 j2 s- X* n
;;;;;;;;;;;;;;;;;;;;;;# _5 ?! _' \9 Z) W$ g
;; Setup Procedures ;;
) ~$ j& B: t  I;;;;;;;;;;;;;;;;;;;;;;
3 H! a! \7 G* b! n9 `5 v
* q0 m5 M6 m* Y. {  {4 J: p;; Initialize the display by giving the global and patch variables initial values.1 J5 S" V2 S4 |5 ]1 F. {
;; Create num-cars of turtles if there are enough road patches for one turtle to7 ]' d$ z- u5 F# f: c0 w9 S4 a. [
;; be created per road patch. Set up the plots.- o9 G: I  ], l9 S: V
to setup
+ ]/ A) z- H/ A2 w/ W+ m  ca$ w5 e, v9 ^- Q
  setup-globals
; I0 [  s+ T$ l: m* I
# s& z3 c$ }4 i+ T. g  l) q  ;; First we ask the patches to draw themselves and set up a few variables2 o6 H- ]! ]$ h& y
  setup-patches" c0 r: a. E% N0 ~8 c& G
  make-current one-of intersections% ~# t5 y$ V" X! B
  label-current( A1 [/ Q: z0 f- @9 t  \; ]

; M' W" B' w; t7 C, E* `  set-default-shape turtles "car"
' k% w1 `6 p- `/ J& c0 L1 V
7 ^, L! S, _2 ^: l2 Q, z# ]9 |  if (num-cars > count roads)
. j& y( Q- s, _: ]  [
! e  x- J8 r, N: M& m    user-message (word "There are too many cars for the amount of "
" C' S+ Z9 O- ^- m: o9 z                       "road.  Either increase the amount of roads "9 J0 H$ X* j" [. W1 M; C& V3 ]
                       "by increasing the GRID-SIZE-X or "1 G, n0 o3 i# H6 ~. F7 P
                       "GRID-SIZE-Y sliders, or decrease the "
- Y6 P; `5 T! d& Q                       "number of cars by lowering the NUMBER slider.\n"
# s% h5 A2 t3 b* S0 ]                       "The setup has stopped.")* T6 w. K- Z! |1 d9 u7 [
    stop
1 M! D6 X8 g+ {" ^  ]
0 `1 t" {9 v8 I1 ~, T1 v  m
' m) B# F1 z$ B$ o4 a2 J  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color  q. c/ h4 P/ Q1 X; M
  crt num-cars
& k" T9 f0 d& o. x$ }. B6 i  [* j, f5 N! n$ m) q6 L: _
    setup-cars* c4 Z3 r: {! J
    set-car-color8 G% i  d" m4 {$ c+ t4 J3 z
    record-data4 \0 e0 d+ j, z5 E  x5 _
  ]
% k" p. V/ E2 y+ D  I4 B. o7 |
  ;; give the turtles an initial speed
. i: j& H; d7 a  ask turtles [ set-car-speed ]! n( H1 v3 N1 H  V$ r* i" m
# z4 I* w  k! c; i% L/ V7 W
  reset-ticks
- u! W; a+ W' hend7 t( W0 w2 n0 Z5 w# v, q

7 `6 U  z4 i. \5 x4 ^2 l;; Initialize the global variables to appropriate values) h7 E$ g9 J3 j2 W
to setup-globals
- z% `; _" i1 w. v5 n  set current-light nobody ;; just for now, since there are no lights yet
# E) b/ P- e8 i' M/ x  set phase 0
/ [( t- f+ m" |2 S. c5 v  set num-cars-stopped 01 v$ b4 W* g: F9 B7 W; S7 J6 ?
  set grid-x-inc world-width / grid-size-x/ c0 @: R3 R( ^% X
  set grid-y-inc world-height / grid-size-y
# o+ P# _. x$ ~& ~5 h+ ?6 w
/ T5 Q& |( P, h$ ]8 g* D* e  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary& n) U9 D$ Y0 V% |
  set acceleration 0.099* o- a- p) L2 N
end$ f  ?1 b- W% {- r1 ?; o) T
0 N5 e- w: x) |2 G% C$ m, l: N
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
1 A( [' F2 z) C3 ]. y;; and initialize the traffic lights to one setting
" p# n' v, c- }9 bto setup-patches
" p, ^7 \6 s5 ^+ R" u  ;; initialize the patch-owned variables and color the patches to a base-color" R' p% b4 p4 r9 i) {% O4 h/ x
  ask patches
$ e0 x5 ]6 g  Z/ ?  [
9 H3 a+ b) r# }. I    set intersection? false% h" ]% s9 X4 S4 T% \
    set auto? false
% \& ?% T3 k7 J1 l( O% b4 h( ?    set green-light-up? true" I  I+ R$ J: C# G0 I) t
    set my-row -1$ Y* k- ]/ O, E
    set my-column -16 z2 O  Q1 F* @3 g" d
    set my-phase -1* ~0 G7 i- e$ w( [
    set pcolor brown + 3
* ^6 R" q* X8 ?" U% S; z& F  ]
9 W; t$ p$ y1 T! ~2 j
: `$ ^/ r# b; B  ;; initialize the global variables that hold patch agentsets
( w  X- z5 x5 }, y  set roads patches with9 J9 `  B- `; `; p4 W
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) t( n' }; G# ?9 G+ S+ l# M    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! N5 |; a( a! X! K: `$ K! m  set intersections roads with
* y, u. H. I- ?. |7 n7 ~( p. T3 t    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and$ P4 v7 N/ {3 s) S
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# h7 \, H1 ]0 ?  d& U: ^) e
6 L7 ~* L1 T- P; ^0 F
  ask roads [ set pcolor white ]/ S% L4 k1 T* M# B% P* d8 C
    setup-intersections- d. v- G8 Q+ j7 J  a4 |
end& L, Q: F/ l/ J0 S9 a
其中定义道路的句子,如下所示,是什么意思啊?+ V& }- }8 Z- O
set roads patches with) M. Z! F% Z  s
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- O4 H. [) p4 f& f
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ z! B. R6 r6 y) T3 r5 A9 G
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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