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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 j9 ~# j) [9 F3 O/ k7 e
netlogo自带的social science--traffic grid这一例子当中,
5 |$ O! F; h( S- x7 J2 f9 H/ g6 S) Yglobals9 k& ^) b$ W& W' V" s, c, \
[
3 Y  V/ m3 g( T% Q  grid-x-inc               ;; the amount of patches in between two roads in the x direction( ^$ K5 R9 c1 k6 g, Q6 z
  grid-y-inc               ;; the amount of patches in between two roads in the y direction. D% Y; y$ Q( L  w
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if1 b4 X0 ]$ j$ B) C9 Q
                           ;; it is to accelerate or decelerate
( P5 M% i: P& X( }8 H  phase                    ;; keeps track of the phase/ H  e' c+ p3 b; k; U4 }3 c$ S: r
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
+ B9 O6 t: w. h6 X2 ]  current-light            ;; the currently selected light8 p! i7 a; r+ ]% ^# G9 l
. p+ O; y" Z0 [0 O5 w0 {6 M  T. H
  ;; patch agentsets% A; p1 D9 }& g: {1 D1 t3 y" z
  intersections ;; agentset containing the patches that are intersections
. w. y/ o8 p1 x8 B* k% I  roads         ;; agentset containing the patches that are roads" M# N3 T0 o1 ~
]* C" v! F9 q& A/ I3 `: |
, R% _, ]$ w1 L. U" C
turtles-own# d+ O( F) P" @, `
[2 N7 J2 T4 V: K; B) D! x# H
  speed     ;; the speed of the turtle( ]! w  O2 F+ h7 E
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
' T( H; t, g  x1 t( }# g  wait-time ;; the amount of time since the last time a turtle has moved4 v' }' ?: G, F! X' n
]$ X( W7 F3 M& U9 Z

# Q* T/ ~& N" K2 f8 l' P) B5 C# J- ?patches-own" x' Q5 J% W$ ^* E
[& e3 Q( p" u, S9 `1 u) I% |2 b
  intersection?   ;; true if the patch is at the intersection of two roads5 Y* J$ `% S4 J5 k0 i; ~* ~! c1 q
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.3 o3 I( @1 j& u5 t
                  ;; false for a non-intersection patches.2 a% \( H% l6 a9 X. f7 }
  my-row          ;; the row of the intersection counting from the upper left corner of the
* e1 V# s! I( I/ k7 }7 R7 ?                  ;; world.  -1 for non-intersection patches.
% u/ g+ C% e+ G! C  my-column       ;; the column of the intersection counting from the upper left corner of the& ^8 [5 T  r1 w; u9 Z
                  ;; world.  -1 for non-intersection patches.
! v8 \$ c. H4 M  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
/ a0 h9 Q# R/ v! `2 Y* `0 K4 E  auto?           ;; whether or not this intersection will switch automatically.& n( _" ?$ M) t( [( l+ d
                  ;; false for non-intersection patches.( |' {* r/ t, i8 ]: Z4 M3 K4 H$ K
]/ ]8 @' k3 Y( {" q- J, H/ P; Y

- O: ~4 D6 t: e! v# V
' v2 \1 u) w, m;;;;;;;;;;;;;;;;;;;;;;
% t$ v$ g( _5 h3 C) U) M7 z4 z;; Setup Procedures ;;: [" p; g) J5 e3 s% k) n& B1 V
;;;;;;;;;;;;;;;;;;;;;;
" C* g# a. n2 N) ~! Q; q( ]
% [& y9 x0 w; s1 M3 _2 ]  Z9 x. X;; Initialize the display by giving the global and patch variables initial values.6 r/ E7 x. T1 y: A5 O
;; Create num-cars of turtles if there are enough road patches for one turtle to
; I, a+ S+ Z6 B  N0 Q1 f;; be created per road patch. Set up the plots.% p) n; V4 K5 E
to setup7 ?0 C2 M* k$ _+ H# d
  ca
8 V9 V0 W  K( M  e  setup-globals
. b4 H: P# A' P2 U' z& a& J9 i) I4 Y* `; Z: ?
  ;; First we ask the patches to draw themselves and set up a few variables3 D6 |2 j3 @( X7 ~
  setup-patches8 u" r& L; o# V; p
  make-current one-of intersections
4 A! T9 T* l4 Q$ G  label-current( P# A4 `- P+ e' |

9 e' k/ ?( [% ]5 W  set-default-shape turtles "car"
5 W; b8 z& ~2 ^6 l
+ C9 u" m4 k% y  if (num-cars > count roads)0 x! j' S6 d$ ~7 i6 Q* R( [$ {
  [  @+ N4 M# e1 X
    user-message (word "There are too many cars for the amount of "
  r' f9 V' U3 T0 P( `                       "road.  Either increase the amount of roads "
; G1 g1 `! ?6 W6 r+ N& _                       "by increasing the GRID-SIZE-X or "2 @+ z$ p# z+ {5 [: [3 Q: l
                       "GRID-SIZE-Y sliders, or decrease the "- H4 V* r- }, Z8 }8 z1 g' M1 N
                       "number of cars by lowering the NUMBER slider.\n"
3 B2 s, w2 H; R% ]; T                       "The setup has stopped."). ~% v2 V' E, n
    stop. U" C+ E1 L9 l% J4 o& t" w  d/ F
  ]
+ u& Y2 A& ~: a% `
. ~: G. ~- u& |5 H& T  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color+ r& F. }* K5 m  t4 Q0 `
  crt num-cars0 e" i1 S" z* z
  [5 E( R  t: b! ]& e$ N$ U! |
    setup-cars
, ~" b" J* k$ |5 s+ d+ J    set-car-color
' X. z/ u, v3 Z+ K5 ^) ^    record-data
7 s! L5 [3 \9 F1 N2 c  ]1 u& Q( j; ]9 E; k
0 W$ U* F  Z: n" }# }- i
  ;; give the turtles an initial speed. B; ]4 e0 A0 Q1 Q+ s2 f
  ask turtles [ set-car-speed ]
/ i5 C6 H$ t/ ?! o
: Z6 s! Q% r+ W4 C: A. Y  reset-ticks
6 U9 P- h$ ~6 X' n1 f9 E4 xend& n8 D5 S2 p4 f1 G
, N0 [* a& q( `" q7 D  S# L; L6 v
;; Initialize the global variables to appropriate values
( Y0 Z; C4 {2 S. e: k' d7 D0 G, Dto setup-globals( k# ~6 e8 }; N3 Z. [
  set current-light nobody ;; just for now, since there are no lights yet- V0 x- @) M7 K  m, h0 V
  set phase 0
4 S4 v) [* `2 K9 W, {  D0 v  set num-cars-stopped 0
5 {! h3 o% \2 l/ k+ u3 W+ \2 l& o  set grid-x-inc world-width / grid-size-x% o: I5 |! L) S& k/ U
  set grid-y-inc world-height / grid-size-y
1 T/ t# d: A# ?/ l' u: I
, T3 F0 w& h" e: O  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
& ?* I9 _' p' m* B  set acceleration 0.099+ f9 w$ ?) z/ O- ?5 x0 L
end7 `5 W1 {  [1 O2 N0 d9 w- C

6 C7 \0 Z. X( A8 T" e$ T;; Make the patches have appropriate colors, set up the roads and intersections agentsets,$ g* g4 G9 |9 H1 V5 p: ]
;; and initialize the traffic lights to one setting
  @. Y6 V2 I- Q* K! a9 W$ Cto setup-patches
3 Z( P# y3 Y9 ~  ;; initialize the patch-owned variables and color the patches to a base-color- Q$ h- M* ?. ^/ i. X! D
  ask patches
% l2 U: p/ R- U' B  [
/ n7 A! B. L+ Y" |4 k    set intersection? false! K! k& C/ n+ |- Q
    set auto? false+ m. v' I+ C. W2 H
    set green-light-up? true
: U: [0 [# a. |' |4 Y+ {    set my-row -1  c/ {" k3 q5 O1 p9 Q  ]
    set my-column -1
( G, `* r: {; ?- e    set my-phase -1
  t. o  T# O; b( v4 C    set pcolor brown + 3
' _+ |, O6 ]- v2 g* z1 k  ]8 K4 w. y9 T6 b+ F1 |$ H

2 d" M# v( R% {1 I" U  ;; initialize the global variables that hold patch agentsets
$ c" ^$ v( s/ A3 y% ~( g  set roads patches with4 Y! t. f8 L5 u! Z0 l; M0 }0 e8 ?
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 T5 t! `8 Z9 v' _; C
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& u) u: ^% r3 [/ c# n3 A! O0 L. Z: U
  set intersections roads with
5 ?: T# P" H! C! r( b! n! [    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
. v, |& z" R2 t5 b/ f    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' \: d! v& P1 m
! M. S2 Y. c7 }) t- ?9 H- a  ask roads [ set pcolor white ]
5 r" F# {$ L. r9 m, s4 y    setup-intersections
3 H3 J. x3 f  V' W, m8 zend
0 c0 J) [/ `# ^* H8 }% F其中定义道路的句子,如下所示,是什么意思啊?' L/ H0 g8 ]) Y( X( \% f4 O, _$ X
set roads patches with
- k5 d2 o3 x  K) H* x* a! e    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 s; P2 w0 g1 I+ g, d
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  z) K* I6 c3 L5 @: S) v7 R
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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