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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。
/ B9 D. u/ R1 ?& m; \netlogo自带的social science--traffic grid这一例子当中,
) O9 T1 j  N) I( l9 rglobals; B; _( H2 O6 V& i
[4 R6 J& Q  Y, A  V( ]  P; p( C. t
  grid-x-inc               ;; the amount of patches in between two roads in the x direction2 I0 L. m# u- H8 V0 t
  grid-y-inc               ;; the amount of patches in between two roads in the y direction( N- d2 d; m8 k: q6 Y9 z- u, L
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
7 h( y6 [# r3 I: O( v6 Z; ?                           ;; it is to accelerate or decelerate
: x  b1 a  `% f, y  J  phase                    ;; keeps track of the phase
) ~3 M0 u7 q7 ]3 g$ @  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
" }) a6 I; ~& P# m' d2 t# ~- V  current-light            ;; the currently selected light
8 e2 g0 n0 G) h+ c  \' J3 @1 H
. S3 r1 L! o* c  z  ;; patch agentsets
* i5 \- F& z9 e& \  intersections ;; agentset containing the patches that are intersections
' {- T) U/ c* G+ v4 A  roads         ;; agentset containing the patches that are roads
' A2 K2 L0 n2 G5 @]% ^7 _) b3 c) Q$ J1 X

7 G  ]* Z# J* R, ~; p9 oturtles-own
& l- ?! ~' j' o7 d* j) ~& X, q[
: S- o2 U0 [3 \5 c1 |' d  speed     ;; the speed of the turtle
; n1 ?/ x1 B$ ]3 U9 @  up-car?   ;; true if the turtle moves downwards and false if it moves to the right4 ]4 g$ }) r6 B: y
  wait-time ;; the amount of time since the last time a turtle has moved
8 ], C$ }& a2 q]
' k3 g2 {5 y; g( f7 X) h  S7 o/ J) I6 y
patches-own
$ `* Q# p$ J( J4 S1 n# W" O: n[
6 }# w/ a$ T  x2 k* ^8 g" _5 r3 v  intersection?   ;; true if the patch is at the intersection of two roads
: o" e& ~% w  n" d! c- \/ @  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
/ k# c2 B$ A" ~: c: n% O. ~0 ]3 W                  ;; false for a non-intersection patches.
' c$ }% q( x* L- A  i/ ?  my-row          ;; the row of the intersection counting from the upper left corner of the6 ~5 w; @; n* J/ @
                  ;; world.  -1 for non-intersection patches.2 S+ f. n! _' s7 m9 S: Q, e
  my-column       ;; the column of the intersection counting from the upper left corner of the
3 c6 M0 L8 x) F+ ^0 i8 W                  ;; world.  -1 for non-intersection patches.) m# ?& J+ M, z. e* W! f2 _
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.+ S( q& D6 G% \8 [+ v: g5 A3 G# m
  auto?           ;; whether or not this intersection will switch automatically.
/ ]! [& l/ _. Y# x                  ;; false for non-intersection patches.3 M. T7 a) T* `: H& p1 l2 @# z9 E6 g
]+ y" l0 p1 \& x* z3 X5 V

, }2 H: e9 T, G: T. ^9 I+ V
3 q; E. B8 W5 `;;;;;;;;;;;;;;;;;;;;;;& s5 f) h8 X! @$ U) u. d, v
;; Setup Procedures ;;$ P3 _2 E- Y4 H- t1 G
;;;;;;;;;;;;;;;;;;;;;;4 B: K# g9 l! J  s! }$ _5 q. H
/ P- M2 [2 ?5 R7 B
;; Initialize the display by giving the global and patch variables initial values.+ n& H- s! E0 y3 M7 q+ g$ Q
;; Create num-cars of turtles if there are enough road patches for one turtle to
* v. X: j  ]7 ]8 R8 w8 t;; be created per road patch. Set up the plots.
/ \+ A* n, M: R# C/ qto setup% G; O& ^# {, B
  ca7 T$ y" t. _, G8 t- K9 z
  setup-globals2 J) [0 v% N9 k% p  h5 d

4 ?4 q8 y! D& W' T0 Q  ;; First we ask the patches to draw themselves and set up a few variables- n+ `& ^3 b6 b
  setup-patches" c3 O# b2 M, k! x" q$ i, D& a; [! T) {
  make-current one-of intersections
% `4 Q0 ?5 y6 E! @  label-current
' P% J4 e5 C3 z3 O; P# F9 V6 t" f2 B4 U2 G
  set-default-shape turtles "car"9 y% ~6 S, }2 z/ |2 n7 M

& E. X0 Q5 u# n: Z, ]/ w+ @  if (num-cars > count roads)( [/ \& {" f& G2 z( a
  [
( b0 I% H: Z" U5 C4 m    user-message (word "There are too many cars for the amount of "
# O) C1 Y# ^: }. i/ c3 N6 o4 V8 Z, j% _                       "road.  Either increase the amount of roads "( a2 z4 c2 T5 ]; Y& w2 @
                       "by increasing the GRID-SIZE-X or "1 D- e+ D$ f0 {' j* z( X1 C. T
                       "GRID-SIZE-Y sliders, or decrease the "
; l% }" Y9 X7 Z4 Y5 X                       "number of cars by lowering the NUMBER slider.\n"
- |' W9 I5 d$ e% t3 O/ _! |                       "The setup has stopped.")+ w4 v! q3 \/ b1 [
    stop' J4 q; y# y3 H0 K: A' j, @
  ]
5 Z6 V/ p% d- b9 m$ i5 c7 l4 {
6 _5 I# v% ~* Q  [8 S% P6 c! v! O  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
1 [; M9 c0 e, r: l$ @4 e$ G  crt num-cars, |# T+ Q# Q2 n
  [& Y4 d* S/ G: O4 ~
    setup-cars
/ T/ [: a2 n! W. K& i- U    set-car-color
& Q9 M9 F% h# ^1 }# Y' ]    record-data
" t$ U$ L# B) q) Z# T; m" D  ]
! W( x0 L1 }$ R0 |9 O' k5 ?, l
( ^& ?2 d! \( M0 [8 U+ V, m  ;; give the turtles an initial speed
5 a) h8 n3 d2 j# {% o, D, M! Q0 h  ask turtles [ set-car-speed ]
/ T  P+ Y% w0 [  E6 r
. l, q3 Z5 f0 l" F  reset-ticks) q0 l$ H+ T& l( R% j5 `# c* g
end0 p  T) j2 o& n  S

. z$ m$ @$ M" j& \" d9 b$ F9 Z;; Initialize the global variables to appropriate values9 P4 D" O' @- w; Q9 r
to setup-globals
/ v9 m1 z  {! T  set current-light nobody ;; just for now, since there are no lights yet
& O  e3 _& l& V1 E5 v7 k  set phase 0: B# U1 w1 [$ _6 P% q' r5 }
  set num-cars-stopped 0
$ E! y1 x2 m3 A  set grid-x-inc world-width / grid-size-x
2 [' w4 w! p' X* C8 Y  m  set grid-y-inc world-height / grid-size-y
5 f8 W/ J: ^6 |6 q9 ]
) Z9 i* z& a& z. q6 Q: q  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
$ t. l  y5 z+ U$ k  set acceleration 0.099
8 J3 Y3 P' G) Pend
, R* H/ [- @3 b$ O/ }! ]+ K
6 \+ r/ W8 T) F4 I' N8 k;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
% o3 S2 l  [2 K: m) _, T;; and initialize the traffic lights to one setting$ s# S9 p. t1 D/ }) D
to setup-patches5 R0 ^1 ~0 c, @: p) W0 s
  ;; initialize the patch-owned variables and color the patches to a base-color
" m- a2 t( l! [! O+ U7 m  ask patches# P+ b7 a$ X; M8 |# W& \
  [9 {- r5 e/ L1 h: g7 N
    set intersection? false) N( c' F! a. V# q. b$ _; b
    set auto? false3 e' P2 k+ C0 C4 R! A' ]; l
    set green-light-up? true3 w7 ~) `2 p* I3 p( i$ d9 d, z! n
    set my-row -11 Z) g# n8 Y  d  P5 ^! H. H- a* ]
    set my-column -1
' Q$ N  L) c. Y& r  H8 \  p    set my-phase -1& i: n( Z, |% d( p( Q: k0 u. d
    set pcolor brown + 3
3 Q1 Q( C, V4 X* S1 I  ]
: r/ ^4 V( I* Q6 \+ M# d. @5 ^
: E7 q6 B/ y0 d2 |  ;; initialize the global variables that hold patch agentsets9 Q3 K9 E! c) i% t- R
  set roads patches with1 Y( a, K: P0 ]3 O, q- t
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: L) F: Y' n6 n' g9 M( |5 k3 j( e    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 D4 @% G/ ?) |* F7 c) ~1 R1 e/ C  set intersections roads with
! a; T- _4 a% W' Y    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and0 i1 I$ Z4 K+ X5 x3 D9 i1 A. a8 n& e
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. K% Z3 m- a' @6 x  y$ f9 _5 v2 {2 b
  a3 ?+ y+ M5 L, {( d  ask roads [ set pcolor white ]; h* d; c& m% o  P4 X/ q
    setup-intersections4 z3 v& ?9 R# v, |2 n
end* u3 ]9 B! x) H
其中定义道路的句子,如下所示,是什么意思啊?, Q; u/ d, l4 m* w
set roads patches with( R4 g, S! s: V- F$ D9 F
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 Y- H6 y3 ?. k3 A. x' S
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 z8 A( P6 F/ x2 e* J! l# \  \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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