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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。
. l8 O% x% ]) `netlogo自带的social science--traffic grid这一例子当中,
3 m( ~+ `( V& r$ a! cglobals1 K) f, |- O& o: X
[1 @0 i) Q, m. P
  grid-x-inc               ;; the amount of patches in between two roads in the x direction' ?# S& T- w1 l8 w8 {/ x
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
& _. G" H% f$ B; N( y  acceleration             ;; the constant that controls how much a car speeds up or slows down by if+ C/ L' l0 |, D
                           ;; it is to accelerate or decelerate; F# E( ~( C1 L+ t% c
  phase                    ;; keeps track of the phase4 F# w0 l1 H& f2 ]! E8 P2 l
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure7 N' e. B9 i# v; u& J6 w4 z2 {2 S
  current-light            ;; the currently selected light9 u4 E+ G7 b' H6 Z! q
) q7 \& V+ F3 ]) f$ S$ X" v) S* N1 }
  ;; patch agentsets% o" U' R4 W: h2 {% E
  intersections ;; agentset containing the patches that are intersections% j' l0 A4 p/ m, w
  roads         ;; agentset containing the patches that are roads
. _/ F: u% r# a8 ~/ {]9 p. Q- D8 B- W0 u4 V

) Q" M- q. Y) v/ cturtles-own
0 Q' v. z5 ~: G& \. O[
, l! D/ V2 ]/ @% j3 v  speed     ;; the speed of the turtle
: b% \, X/ ^, V% ?  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
8 ~, [/ N1 w/ l: x; n$ i: _: j  wait-time ;; the amount of time since the last time a turtle has moved
0 X' l$ m- b! Y6 T( D8 V]' `3 Q/ `' h+ T+ c

/ i. H, A3 Z4 V& q0 d& c" cpatches-own4 N2 a, S' b# q) S
[
+ f3 x0 ~7 V& S# O) d7 @! ~( L  G  intersection?   ;; true if the patch is at the intersection of two roads4 u2 C6 b& `+ K
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false./ {" J, R9 f* ]* g7 i
                  ;; false for a non-intersection patches.
) n# b1 p; [6 I/ ~) H  my-row          ;; the row of the intersection counting from the upper left corner of the! t5 l7 t" S4 [. P7 u; }
                  ;; world.  -1 for non-intersection patches.
: @8 q4 Z6 ^* D/ t0 z5 n" l  my-column       ;; the column of the intersection counting from the upper left corner of the5 ^! P; O0 [8 j( E
                  ;; world.  -1 for non-intersection patches.
, h+ w" \, A& H% H0 U; ]  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
) P6 T! F: j" ~$ r  o9 z  auto?           ;; whether or not this intersection will switch automatically.7 p7 i2 [6 F+ M# {' R  ^3 b3 O  q. \
                  ;; false for non-intersection patches.
) S. v, ?. ]2 O# g& []$ U+ b9 F2 s$ ?- p5 T+ ?8 T3 l

, A% p# R2 [5 O! Z) N) b$ Y' O! M" K: c0 t* ~' b) _$ @6 R0 p
;;;;;;;;;;;;;;;;;;;;;;
0 m6 K4 @5 r# Y( J' O;; Setup Procedures ;;$ x0 T) W% T: ]) ]( a
;;;;;;;;;;;;;;;;;;;;;;
" _# T! y* {8 T7 U# k
4 \4 j9 O$ n* V" Q8 V/ t;; Initialize the display by giving the global and patch variables initial values.2 c7 d  l5 N& N
;; Create num-cars of turtles if there are enough road patches for one turtle to
/ A8 d5 H1 G& K( S3 t;; be created per road patch. Set up the plots.: W1 u& t3 d" i. x' t. b  T
to setup" I7 j' v8 W# \
  ca- i; W+ |7 a5 A4 C
  setup-globals
& N+ X. Y3 G. X2 F8 `' i4 {8 G$ ]! N7 W! Z. k
  ;; First we ask the patches to draw themselves and set up a few variables
# j- S+ q2 \! A4 a6 ?  setup-patches
. H# T2 C$ n! ?/ i5 d. k  make-current one-of intersections/ m$ X$ P- z, a  t+ X: G1 c
  label-current# Q  g4 h7 y7 h

8 n1 b5 ?! B* m4 Y) i6 P; O0 Q  set-default-shape turtles "car"- h& `3 y0 W/ \) C/ ^
/ z; Y9 F9 c# S* }3 c
  if (num-cars > count roads)# m% W% k7 A/ _5 W$ C+ G  |0 d2 s3 U
  [
8 ~& ?2 L  \6 {# h3 }. u+ c4 p    user-message (word "There are too many cars for the amount of "
% }0 B5 X% a# V) j4 I* C                       "road.  Either increase the amount of roads "
5 d8 E: x& V- r3 R6 `2 A                       "by increasing the GRID-SIZE-X or "% d) M8 L; ?3 S9 g3 L) J- D- B
                       "GRID-SIZE-Y sliders, or decrease the "
5 a. A0 l0 |  x, C0 N: ]9 i: }                       "number of cars by lowering the NUMBER slider.\n"
& F  j/ A  }, G; M. i2 x                       "The setup has stopped.")
. D" h1 B8 x9 y" G6 ]2 `2 Y    stop  B" n0 ^$ [  }$ o9 u: T4 n4 i
  ]
4 o! g6 O7 V- z3 g  T7 G0 v8 u! ?. x5 t/ _3 V' ^
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color! j& N  w4 P, U* D8 ~
  crt num-cars! [8 {, D1 Q6 i) x2 @7 Q9 G
  [
2 `2 b# l. F1 ^1 T) g+ Q1 c    setup-cars, g$ n- c, Y7 l) M7 Y' }3 p+ x
    set-car-color* j; P! ~3 J5 F2 p
    record-data
  W+ k. J$ Y% y% t1 z' w& E  ]
1 [3 I: l8 N9 |" v3 F- ^' [
: Q1 W0 X1 c: `( @* W0 P  ;; give the turtles an initial speed
7 J. n. f1 }7 V& D  ask turtles [ set-car-speed ]
8 [# b. i5 h& {& `( d3 k
" H+ C3 x% @" a/ O  S7 O" x5 p  reset-ticks
+ B* Y3 }7 r/ X  Lend3 d& ~3 S& v  w9 q- @) ?1 m
8 {0 e9 G9 m) e. u3 v5 n
;; Initialize the global variables to appropriate values
" }3 i& F4 C% ?2 jto setup-globals
  ?7 s; g$ b9 f; Z- L( s- b  set current-light nobody ;; just for now, since there are no lights yet
3 L+ F, u- X$ {, W' l  set phase 0: k# j) m* l) w& z! j
  set num-cars-stopped 0
1 c" {& \9 i: s- \- r  set grid-x-inc world-width / grid-size-x2 d" ^* Z6 Q6 P% v1 @0 r
  set grid-y-inc world-height / grid-size-y
9 Z; Z0 z: u( C) c5 m2 a3 i, b
6 z3 |1 W  |; {. N, Z: S% Y: q2 R  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary' c$ B( h2 e2 E! `4 G, f
  set acceleration 0.0998 c5 {  P( X! e. s8 {- \$ t; E
end
! L! }9 F- K* `- S9 }  R; w1 j# ?# {  |
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
( u. q) x% c# K) S- L* G4 `9 X;; and initialize the traffic lights to one setting
3 ~: c' n6 @/ b3 g( {7 c$ `to setup-patches3 [- Y1 k6 i; h
  ;; initialize the patch-owned variables and color the patches to a base-color
% R" A7 v9 R) n, |- P0 y  ask patches
% [1 u" e' c' E7 |$ N9 T  [
4 x1 U7 Z4 A- m# D! }* F4 j    set intersection? false( ]' y7 W* i' b' t% L
    set auto? false" n7 I9 p% `( D; \4 w% ^7 e
    set green-light-up? true
) R* y' e- a0 d+ O( E% D6 ~0 m) R    set my-row -1
! X/ z3 M$ R9 @    set my-column -1
% M2 R4 r/ f7 r2 O    set my-phase -1/ m# d1 {7 k( J$ j; ?1 o+ ^, E
    set pcolor brown + 3% X1 b' h& Y/ j; S9 v# k8 e
  ]" u# K; T) O8 f/ B0 b
$ w  t+ s4 m# z+ w
  ;; initialize the global variables that hold patch agentsets# _% q  d# u6 `" C3 @5 M( _* O
  set roads patches with+ `3 t. P; f4 L
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 r1 d. |" _/ ^7 V% c    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) ]) y. Q; D+ t, d6 b) r5 X
  set intersections roads with. J" `5 P5 P" O
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and& @6 {. J+ K3 ?* x( [, S
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* V, v. @! D( {. }; S: x3 Y: l
4 i% E5 E$ v, k- i$ y- y
  ask roads [ set pcolor white ]/ r+ w3 H' p" z# ]' r
    setup-intersections
# g( G+ @6 z+ P/ y, t- w2 Qend
( x  A) d  l& L5 G0 d其中定义道路的句子,如下所示,是什么意思啊?
7 Z1 w/ K4 R' s7 j) i set roads patches with5 p& ?0 [* P! c) j6 m& z0 Q5 T, m
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. b, t% |0 B; Y5 J' v% b% q' _
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 n$ d* j* h2 P4 _1 i
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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