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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。
) w$ M4 w7 \, r5 Snetlogo自带的social science--traffic grid这一例子当中,# S5 }! S3 m( u. k. D$ j: J0 i3 e
globals
3 m! }0 T# c: K0 W& |[
. ?1 w. ?( @9 b/ V7 f& u& T  B  grid-x-inc               ;; the amount of patches in between two roads in the x direction" @5 }2 z% ^) Y0 ?' ?4 J+ I. Z/ o$ N" v
  grid-y-inc               ;; the amount of patches in between two roads in the y direction- f0 C/ P; n% d' P* m. n9 _
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
' ]( _* s: T! i/ \* C) `3 Y                           ;; it is to accelerate or decelerate, R# z1 o8 h  i& n& _- Y
  phase                    ;; keeps track of the phase: Q* R. |1 @5 F9 I5 |. w& T
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
9 _: r% |/ G7 F* ]  current-light            ;; the currently selected light2 }% p% z, U# q( Q; c$ ?
; I1 U! U! e+ t
  ;; patch agentsets
5 O8 b# D% q! p- b- W  intersections ;; agentset containing the patches that are intersections
" k: o: @" T5 ^: i  roads         ;; agentset containing the patches that are roads
0 F5 b) W$ r$ C( P& G1 Y; ?]* D6 w+ c- t; I; a' E

" n" l+ P2 I  }/ {; T. q0 W7 pturtles-own
4 f4 s5 J7 [$ R[
1 }! ^& H: }' s+ e; {  speed     ;; the speed of the turtle% x; O! Z  x* [7 |" x
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
2 W- B( `( V" E4 h2 _+ {; u! [  wait-time ;; the amount of time since the last time a turtle has moved
5 W' L+ s3 O) I]; }- c0 p2 V# B9 m& J/ J
! r3 H9 `8 B* B4 S/ o
patches-own
4 ~- }3 x: Z; {% o[
; z& v1 U  o! c8 s4 w  g  intersection?   ;; true if the patch is at the intersection of two roads- g7 J+ L# v7 A
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.  b  c- ?  \3 Y
                  ;; false for a non-intersection patches.% f; w" X, A" t: I( n
  my-row          ;; the row of the intersection counting from the upper left corner of the
# A7 ]0 E% Q$ I% ]2 u' e7 n                  ;; world.  -1 for non-intersection patches./ h. M# [" [* U* ?+ h, Z7 e$ A
  my-column       ;; the column of the intersection counting from the upper left corner of the  c4 A0 p9 K+ P* A; y& g1 K
                  ;; world.  -1 for non-intersection patches.3 a+ a+ ?: s2 a! l! F$ T% V& g' `. v
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
; f$ m2 U+ }# H. w$ n  auto?           ;; whether or not this intersection will switch automatically., }6 }, }# i& i9 Y& \2 {
                  ;; false for non-intersection patches.2 ]# ?% g2 }8 j! |! `3 i5 l
]
  `8 A' y% y  K7 _% `* v- Y* a2 m3 Q5 a' v5 V7 D7 u* K" S* z! n
$ r4 @4 H% C. V
;;;;;;;;;;;;;;;;;;;;;;
% y5 T( H6 c: a5 U$ O6 r) V;; Setup Procedures ;;: `) N0 V% l8 @5 H" t$ s2 M) w$ r
;;;;;;;;;;;;;;;;;;;;;;
% u. M1 M* G% U: p3 e
8 n/ P1 h+ g, j/ Z8 I;; Initialize the display by giving the global and patch variables initial values./ T$ p0 ^8 }* m: r8 B1 r
;; Create num-cars of turtles if there are enough road patches for one turtle to6 ~/ h/ x1 `. R: P
;; be created per road patch. Set up the plots./ D/ c( t/ G4 n( f2 Q! G
to setup- B# R$ x- m4 d
  ca8 Q* z9 m( t" _
  setup-globals
9 P4 F; V1 R5 w; F5 j5 n, W/ K! I" i
  ;; First we ask the patches to draw themselves and set up a few variables
6 ]3 @* P: B3 X  setup-patches1 |! @8 Z5 R6 A* u; V: I
  make-current one-of intersections+ R, k, i  N" I5 B
  label-current& e( P& d) `7 U& l; u6 s

- w& B: `; Q8 I, s4 F  set-default-shape turtles "car"
5 y- j4 j1 q* K& q
: l. Z$ X& {  K" V3 q3 |/ [; @6 r  if (num-cars > count roads)7 ~+ s/ }* R8 f: D
  [8 D. E) L$ \( G' f& s
    user-message (word "There are too many cars for the amount of "
- B/ m7 S5 `: }- l$ M, x2 r0 r/ c                       "road.  Either increase the amount of roads "' i- V$ f6 N/ J8 C* o" |
                       "by increasing the GRID-SIZE-X or "
% m' N3 ^; |: m" \; E, e$ @# R                       "GRID-SIZE-Y sliders, or decrease the "
! R8 k- G. R: w# W; c- M5 W                       "number of cars by lowering the NUMBER slider.\n"$ Q" T) S2 o; N- V
                       "The setup has stopped.")
3 o0 _7 J, o4 {" w4 i2 @* k    stop
, R: Y2 m: D& e/ _3 \* j  ]- ^$ x. a/ u9 @8 p5 q
2 v" K3 t; X9 _
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color, O3 |6 a% ~' \' |8 n
  crt num-cars$ ^7 o; i! T1 C  ^% a
  [9 ^# {6 m9 K. m5 A# N
    setup-cars
, Y7 _5 W; o8 m+ R  a    set-car-color
$ `8 F' D+ T. H" O    record-data
- g# l- C8 c9 Y: x. m: B6 C. X  ]
. q! x5 H- }, }/ V
* j, \  U/ d5 Y% k7 p  ;; give the turtles an initial speed
1 ^0 S' A) t+ E! M6 A: q  ask turtles [ set-car-speed ]
0 v9 b# B1 A: q
! ~8 {; L- ]9 u+ ^  reset-ticks2 h7 V5 ?/ a# X  q
end0 W  @/ H' {: k8 H& q( [2 Q+ P, s

/ Y% }6 @& w6 A0 y;; Initialize the global variables to appropriate values
5 B& n7 u! e, G' \2 Z/ eto setup-globals& Q1 M$ n! w+ ^. G9 j
  set current-light nobody ;; just for now, since there are no lights yet
0 ^, k' _- T- }  set phase 0
% C" u$ g# y: }1 L4 R  set num-cars-stopped 0
0 h$ r2 n% O' k# ?  set grid-x-inc world-width / grid-size-x
/ }; x) N3 w2 V/ I2 ?  set grid-y-inc world-height / grid-size-y9 p+ D- z+ x9 e; R
5 ^) d$ X9 J; g% D; z! E3 L
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary) r" C3 l" Y: c7 a
  set acceleration 0.0995 J: `! _( M8 E$ A" ?5 L. g: v
end
* i. b5 M3 ^, y3 f0 ~( T4 ]& y1 F  m8 o& J
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
: j2 G- C7 x, @3 W, x" _; C% t;; and initialize the traffic lights to one setting
7 y/ u" t' C8 y+ f7 r4 Rto setup-patches# ]0 n9 F; l' ^* n
  ;; initialize the patch-owned variables and color the patches to a base-color6 e3 U8 b, w8 L3 |3 U' s+ |# Q
  ask patches
1 Q) j9 a% G& V( N/ e  [
- X+ a2 _" ]+ K# e# p: B0 t    set intersection? false- I4 N( [# f+ u6 N6 l9 R# Q
    set auto? false
- o  v9 Y, y/ O$ ]    set green-light-up? true2 ^: \* b0 G: |" \! w
    set my-row -1
0 O7 ~+ t2 d4 y4 ^( U( j    set my-column -17 t* j. o* }! R( ]
    set my-phase -1! {9 h1 C9 Y) W0 T' S' F. w6 X) _( b
    set pcolor brown + 35 F+ H$ Y" Z& J* s6 e1 y
  ]
0 N" ]; N% c7 b# q! P' Z' \3 s8 ]& r3 f3 u, W  x
  ;; initialize the global variables that hold patch agentsets
# e0 Y$ Y$ F  H  set roads patches with" A5 s+ w9 r3 x- S' @9 s4 n
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 U! }* R  T, K. a0 I    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# _! U/ x( }5 S. O2 Q% J+ B8 G+ N  set intersections roads with
! d$ C/ }2 K! }( {    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
! |; ^- L% d9 v- c' D    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! Z* j. d+ z# m4 G$ V4 N, m
* L2 d! y, e- D/ P5 x* E' j  ask roads [ set pcolor white ]0 o6 F# x$ P1 R+ P$ t8 m+ x5 R
    setup-intersections
( ~8 n$ r8 W! k. Z1 ?# Eend
% B% O$ d& O" |, Z' d* o其中定义道路的句子,如下所示,是什么意思啊?
; ^7 l1 Q% o( Z# e8 u+ V set roads patches with
2 u5 N% W* b; o# `4 N    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ m7 f. @  o3 @$ U( z! O    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 A5 P7 I9 U  Q0 s4 k
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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