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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。
$ ?6 y& ~3 o6 ?6 V9 g8 [netlogo自带的social science--traffic grid这一例子当中,
+ q5 L+ k) Q6 }globals
7 C, v. n2 V! N+ {  P" b8 A3 @[) ?& r3 P/ b- q
  grid-x-inc               ;; the amount of patches in between two roads in the x direction4 `4 S+ C% N, \0 n. N5 _
  grid-y-inc               ;; the amount of patches in between two roads in the y direction4 ]( O, U# {$ q/ e
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if& e. j$ r0 b7 f" v; M' \7 f
                           ;; it is to accelerate or decelerate
, C3 q  K9 ]  [6 S  phase                    ;; keeps track of the phase
, `4 O& j4 q- x0 L. O. j( A  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
, k# q8 U+ d$ B3 r, G: E: c! l/ b  current-light            ;; the currently selected light, \5 F2 v. v6 m# V
0 u+ Q1 n% D; H2 N9 c# N5 K
  ;; patch agentsets. U1 u2 w% p6 V9 L% F' P
  intersections ;; agentset containing the patches that are intersections6 W0 A) O6 L9 M# X
  roads         ;; agentset containing the patches that are roads
# H5 u! B' l# P3 t- A. a1 v* D9 p]0 }- r/ L2 i. n# g: F
/ d$ B- e. _+ s
turtles-own
6 ?3 p9 e8 z( Z( |. o[" S  P1 J: C8 ^& z5 h
  speed     ;; the speed of the turtle
. q$ p" y; @: {: u- L0 E  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
& g; }% T6 N+ I9 R9 M  wait-time ;; the amount of time since the last time a turtle has moved
& H* ~4 U0 V" E2 b]
3 V2 o( F( E+ g9 p. m
0 |/ i- X) t  \% p; I- o- Dpatches-own
1 p  V) I7 p5 q; W2 M/ Q[
! X$ n6 J9 |  N# _  intersection?   ;; true if the patch is at the intersection of two roads
0 ]9 u' s, R* f' ^) k5 p7 ?3 }  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
9 G2 Y! B1 a+ _" m                  ;; false for a non-intersection patches.. q( [4 [' ?. G; k. O9 v
  my-row          ;; the row of the intersection counting from the upper left corner of the
0 e# r" X3 |( b* Q  p- X                  ;; world.  -1 for non-intersection patches.
; Q, S# l$ J% b5 c% Z) [$ J9 e& w' _  my-column       ;; the column of the intersection counting from the upper left corner of the
% {8 _$ b5 t7 |5 Z# q6 A0 T" N8 s                  ;; world.  -1 for non-intersection patches./ ~) H- W# |3 i. e+ |6 d; @
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
4 F) G0 L. v4 H  auto?           ;; whether or not this intersection will switch automatically.
/ t! r. p9 D. h; Y9 M                  ;; false for non-intersection patches.
& a+ |- T* X1 o  |% F6 @0 z]
) n9 ~6 f+ ]) f! ?! r& C4 s! M" n( w/ z% n3 l, g) w& k- `
: [5 w  S: @1 o. i9 W6 F
;;;;;;;;;;;;;;;;;;;;;;; q% \4 Z; `2 W) t! t! {2 `5 l
;; Setup Procedures ;;' A# ~: p7 A/ c. V+ M
;;;;;;;;;;;;;;;;;;;;;;7 d7 j0 E3 m2 g4 x) N7 K, i
6 X  _0 g" B" w/ i5 F5 i: f9 Y
;; Initialize the display by giving the global and patch variables initial values.
. s% |' F5 M; i' ~( v& t% I! m;; Create num-cars of turtles if there are enough road patches for one turtle to9 g/ p7 P' y; E/ L0 b- }# {
;; be created per road patch. Set up the plots.$ N$ p+ }& W- m) w) U/ A
to setup
8 t9 _& s5 K% a  ca
1 V( e- W' c6 D% k/ _, L  setup-globals5 y- M( }" N( I" f! s9 T- E

$ z: l& D5 V0 W7 S5 J. g& n; B1 P  ;; First we ask the patches to draw themselves and set up a few variables
. ?' m: u$ _" e6 B" T0 V) A' X3 x  setup-patches4 v( F/ K* L7 N% \4 s* j* z
  make-current one-of intersections
% X& ?: ~* x. I" X) g; I9 w  label-current6 S; T6 s, [# e& d% M0 ]0 J
( D) \" }. e; H* q3 ^
  set-default-shape turtles "car"
8 C! S+ R# w2 w; {. T/ Y: ~  m' l! e+ w$ w' D4 @3 Q9 ~: k
  if (num-cars > count roads)5 T7 |! a7 m. r; O+ O% [9 B/ e( s" |
  [1 [. i" [0 g( I( \- |- b2 s
    user-message (word "There are too many cars for the amount of "5 o$ B4 |; ~( M' `7 U5 _
                       "road.  Either increase the amount of roads "% F( M* R& D3 ~7 i* J, i9 n
                       "by increasing the GRID-SIZE-X or "9 s2 E4 j2 H9 n/ x: k& I* D+ j
                       "GRID-SIZE-Y sliders, or decrease the "
7 O4 y3 y, j+ P                       "number of cars by lowering the NUMBER slider.\n"
# W1 j4 h0 e. `$ Y  U                       "The setup has stopped.")
# \; j( b* A+ s  o. Q    stop
7 p' w5 x3 y7 p8 w( d8 F  ]. F! U; P+ x+ _- B
" n! q. ^) i. W5 A8 ~$ P# ~7 @* ^4 u
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color! ?# S, z& p: m  i" h* P
  crt num-cars8 Q/ a8 [" e  g! l! u
  [
) [  I" F2 @/ y: V    setup-cars, V, M, X, c8 u' g( V
    set-car-color
3 r4 z. N3 V7 r" }& b# W1 B7 t    record-data! Z: r; F# O+ F) s
  ]0 ]% V& H. s  L+ e3 U
0 N) b6 ~! ?$ J. k- z: m
  ;; give the turtles an initial speed; B! Y; m: w5 P$ @7 f6 E$ R
  ask turtles [ set-car-speed ]$ q. J9 l  }7 N8 T$ [
' H- M  l% g6 t6 e5 m+ n  b
  reset-ticks+ r" C7 _1 f& m' r1 y+ y0 ~: u- P
end
% @. u6 t8 Y, Q8 u4 }) a5 ~3 {+ T6 [" w
;; Initialize the global variables to appropriate values
/ R2 }# [1 K2 g, p/ t2 b- qto setup-globals, a, o/ N/ B+ ~+ {* M& q
  set current-light nobody ;; just for now, since there are no lights yet% @: D( R0 m* Q  l
  set phase 0
% X/ a# i, K* @1 Q; x! M0 A  set num-cars-stopped 04 S: t+ _4 @. m' n& f
  set grid-x-inc world-width / grid-size-x
7 C6 l3 z; U! {  set grid-y-inc world-height / grid-size-y0 m  Y' L* V2 g. s; e

' s; N1 w+ N) G  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary) U' h; G+ s! ^' a, e0 r
  set acceleration 0.099
1 _2 N8 F! j6 P+ G4 Y1 g+ jend& H3 l) W+ @( C5 c
8 \3 q/ G5 g- {( j
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,/ x: M4 }1 k% Z
;; and initialize the traffic lights to one setting
3 t, T- ?! T" W; X3 L6 gto setup-patches
! z" }$ {0 P7 F% a6 u- a  ;; initialize the patch-owned variables and color the patches to a base-color3 x3 Y2 A0 P$ ~" }: P( N. h
  ask patches
- {! e/ _2 e7 {  [
& A% o# l0 o1 o" p6 t4 s    set intersection? false
4 N; U" k2 v. f% U" Y    set auto? false
* P2 d" b) N# b1 W4 F    set green-light-up? true
) D+ {0 i/ ]+ f* M& F) a    set my-row -1
2 J. {8 J$ t' q6 O* |5 X" x4 A    set my-column -1
- t: s1 t+ V! z8 D) o    set my-phase -13 z7 I8 {$ W( Y9 V3 y
    set pcolor brown + 3  @" k( T, |7 F+ Y$ d8 ]" Q
  ]
# _, K7 r) C0 {  K3 I$ B7 [( K
/ W* b/ A7 y3 K/ j+ Z' n  ;; initialize the global variables that hold patch agentsets
$ d% f8 }0 U2 O, \3 P  set roads patches with
, r) m- X/ s* v7 T; a2 @    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" E8 r5 I1 Y0 O0 O% V0 {
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 \0 b# ~: s7 B$ S* ?& P. k  set intersections roads with5 \- b1 R( L7 p, ^% J" [) @
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
: E8 C2 i& s7 n3 ^+ {; I, o    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. L; U& T, _9 `% D+ U( f

1 Z4 M% L: y5 Z& I) X  ask roads [ set pcolor white ]
7 o' t6 `3 y' `6 R    setup-intersections
6 z, {! B) w1 ]* S) a; O2 z" \! U8 N- oend
0 E; N3 I% B& v其中定义道路的句子,如下所示,是什么意思啊?
+ {  q8 R; G) H, {  c6 J set roads patches with
+ t# p. {' K( @* c. {' r) D    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 N2 y6 o3 |  h2 W6 j
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 H  n. Z, I- _6 X3 F$ Z: g
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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