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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。
0 d3 ^9 l8 N$ x7 d/ cnetlogo自带的social science--traffic grid这一例子当中,& H% r3 k; d( R4 h' y. G7 s$ A: U
globals
/ L3 N+ D8 s/ y6 C0 Z' M[" D( l4 p0 h( n+ g2 k: d* i/ x- u
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
) X" w4 v  U5 r/ I/ L$ W& k# T  grid-y-inc               ;; the amount of patches in between two roads in the y direction$ T. J' Q$ U' H2 r4 X
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
% G! Z- @8 r9 r: x5 c/ [/ N. }                           ;; it is to accelerate or decelerate
1 D% X# j. t7 p. A6 q  phase                    ;; keeps track of the phase
- w% H' M7 O& P; }6 s. q( k. K  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
- H9 l+ d5 x2 W2 F( Q  current-light            ;; the currently selected light5 n. A& w0 f) U  D; T

* P5 {3 A' q1 L. Q. j; i  ;; patch agentsets
( o9 o- v! h% B  intersections ;; agentset containing the patches that are intersections
% [* V9 J9 |( L3 b) Y  roads         ;; agentset containing the patches that are roads
  f/ x* j/ P! O2 h& m# u: _]. C5 l5 z( d! f$ }) T1 r! x" m
8 d% t: _& |* _' w+ X. {' c$ E
turtles-own
9 B* j9 I$ j: Q8 X0 D6 v[  I& g$ f  i$ O. H* {. [
  speed     ;; the speed of the turtle
2 T' h; Y* R( H# c  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
( Y1 ^+ S% a# c" B/ e" O  wait-time ;; the amount of time since the last time a turtle has moved
" H5 ?  q/ Z: C: U) k7 e" A]
- v4 }: D9 @# V: ~9 F
& g$ i* B, A( Y# r) |patches-own+ z( o! C/ \$ N- h
[4 @0 k# f2 [  o4 V- J: O
  intersection?   ;; true if the patch is at the intersection of two roads
1 F# w. X: O, Y/ ]( q  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
, e' U, ]% a' f5 R5 Q& A! d3 C/ X& m                  ;; false for a non-intersection patches.
/ @5 a! {# N1 u4 F% ]( }  my-row          ;; the row of the intersection counting from the upper left corner of the0 `$ F4 P/ P9 e9 Y
                  ;; world.  -1 for non-intersection patches.5 a0 m3 A. |5 q" g9 X
  my-column       ;; the column of the intersection counting from the upper left corner of the
% [1 ]% \* G; Z                  ;; world.  -1 for non-intersection patches.: @! k# B* _! D! o$ `; q
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
% c) L1 X9 _4 i9 d4 K" Q/ D8 Y  auto?           ;; whether or not this intersection will switch automatically.- c# J$ Q' t* B, H
                  ;; false for non-intersection patches., }# B/ w: U2 a4 v9 P
]7 U2 Y' x! _* ]# }# S8 M

8 P& X& I% j3 @, ]# T; Z, [; j
1 w7 p; Z) e- N+ E8 S& @% r;;;;;;;;;;;;;;;;;;;;;;1 q9 Z4 A0 u! j
;; Setup Procedures ;;
2 {6 Y. L! s* G0 ], b4 s/ }0 q;;;;;;;;;;;;;;;;;;;;;;
& S2 j7 g% R' L4 U' W- r! ~- i1 |2 i$ |' U$ W' w, N
;; Initialize the display by giving the global and patch variables initial values.* a' j4 ]/ ?4 O- ]5 l/ N
;; Create num-cars of turtles if there are enough road patches for one turtle to4 z+ o2 C# ^9 ?$ b
;; be created per road patch. Set up the plots.3 I5 e4 r9 o7 k
to setup) u8 }, R( i9 l. Y2 c) H7 O( F" {
  ca! r2 o3 N, A7 M! }. f8 Q- R/ ?
  setup-globals
2 x, V8 |' p! x- r9 M2 K9 C/ m& F, E$ b  U- ~8 Z0 k6 J
  ;; First we ask the patches to draw themselves and set up a few variables
8 X& x5 g3 ]6 J# Z/ X# i1 Y" s  setup-patches3 A9 s0 [2 J. {
  make-current one-of intersections2 r# q3 h3 X9 D3 b0 q, A; J
  label-current7 G5 a4 W$ t0 w
5 u! p9 \. ?6 O# `8 R
  set-default-shape turtles "car"7 J4 E0 w8 o) L$ x' V+ q: N
) X& t: {  G6 `3 M5 N- a
  if (num-cars > count roads)
& h/ ^0 s* o0 P- k  [
5 [# `9 p1 x5 ^, f    user-message (word "There are too many cars for the amount of "$ @0 D4 n  D5 C, Z- o' b0 G$ z0 q
                       "road.  Either increase the amount of roads "( O4 A; T; U" J' T: A
                       "by increasing the GRID-SIZE-X or "
1 H7 L- q. t7 A                       "GRID-SIZE-Y sliders, or decrease the ". v6 z) r: E5 s4 i) V
                       "number of cars by lowering the NUMBER slider.\n"8 v" t" |# v" O3 [
                       "The setup has stopped.")
6 e, j# a" U/ L& M; y    stop
8 @6 d$ i) Y/ n( H9 I. n7 P5 O0 k2 r  ]9 T; Q3 h5 B+ S8 O' ^
, F9 m$ K& c3 A
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
7 [: y" _) R- j; h; v# G  crt num-cars* u- {2 l; s  ]8 V# y7 v; M
  [0 g5 G3 q: }% o1 Z0 ?- Y) v
    setup-cars$ j0 q2 d' i5 u
    set-car-color7 u; R1 b% Y8 a' Q) R% A2 [+ l* u% W0 ^
    record-data
/ F* X+ @1 k" G1 a; ^  ]5 Z2 X- _) c/ M& E

* o; v+ D( x7 y2 M8 J4 E4 F  ;; give the turtles an initial speed
7 O4 Z* S& y6 @0 _, w0 y  ask turtles [ set-car-speed ]
" N3 ~( K" t& I3 w
1 n, M  S1 t8 v! q! k  reset-ticks
$ Y, T$ {. G) n9 P4 G6 H; h- tend/ E- \5 }: P) I# R8 s" s

5 j& s8 `9 I0 j, Q/ `/ _  s;; Initialize the global variables to appropriate values
3 u" ^% ], |) {- jto setup-globals
. A. ~0 R  u( M, @  set current-light nobody ;; just for now, since there are no lights yet
. W, ~) Y' U6 ]* m0 ^! |  set phase 06 d2 f2 M# h+ _5 Y
  set num-cars-stopped 0
& ^, M& k( W# X" h8 h7 l  set grid-x-inc world-width / grid-size-x1 N. p; ^+ W5 x
  set grid-y-inc world-height / grid-size-y& o% {. ]! |( }0 s. Z
' m. r. T3 T* f" Y0 t1 @* R
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
7 h- ?# m8 T$ g, \6 _7 a  set acceleration 0.099+ H/ f! u1 F+ ?. ?' T) f% U: X/ h
end
; s0 B& S- P9 Q+ M6 k% M/ K9 u& x
5 x# F: S( I. E, ^* k* @9 b: F;; Make the patches have appropriate colors, set up the roads and intersections agentsets,0 f2 l' M- U4 ?0 u  c& Y
;; and initialize the traffic lights to one setting
% p) o) J. Y! V/ R  V7 Bto setup-patches6 `) d- w! Z6 w# s
  ;; initialize the patch-owned variables and color the patches to a base-color
1 ~( ]9 m6 S1 L% ?5 [" p8 r  ask patches2 z: b: j' d, b' h  l! E, v0 z
  [
9 I* z( h3 ]& s) [    set intersection? false
# P5 p: }' q  j- [" ?1 a3 d    set auto? false
/ i5 j6 j7 e2 I  w) K, d    set green-light-up? true
- ?, g  U3 I- k1 |$ g- I    set my-row -14 s  j, p' U7 R% X6 E' \
    set my-column -14 W7 X. e2 U- q
    set my-phase -1  i6 U. T5 f* `, ^) }1 a8 p
    set pcolor brown + 3' O& g8 T8 E9 o: l8 D4 \9 T9 N
  ]3 R# W- \# m- ]" H; e+ S! W* D

1 K: n: [+ g1 m* `  ;; initialize the global variables that hold patch agentsets9 G8 \  R+ E: S2 r, \; @/ a
  set roads patches with- B" Q0 e+ |9 h
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 R8 ~, I7 Q+ F    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: i9 u" h7 Y2 T5 k; M8 j  set intersections roads with
6 G3 X& V/ z+ ?& T1 m- X    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and( h- b4 o, s  {$ h- k
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; N: E+ S! k9 ^$ R1 S" m" {% l% w
! U6 F. u1 B* N4 U' U' s
  ask roads [ set pcolor white ]
) |; [) P) i! h    setup-intersections
6 s. I4 J: A$ y8 U: z. Xend' i1 S4 I, V5 l6 _% s
其中定义道路的句子,如下所示,是什么意思啊?
% x& _- F6 m  k! R+ G; F$ X9 [2 {; k set roads patches with
! V+ i* b' b, ]    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 s  C! _' v" m* J. O9 d. U
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" t, R) t1 [! R6 g0 O0 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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