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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。
: |* h) h! g6 b" f5 Enetlogo自带的social science--traffic grid这一例子当中,
* m1 y4 h, L2 M( B+ `; Rglobals) p5 E( t$ y1 Q  w
[, y9 r3 c6 o  H. G5 k
  grid-x-inc               ;; the amount of patches in between two roads in the x direction' a$ i* q5 L5 @2 T/ U, C) R  r
  grid-y-inc               ;; the amount of patches in between two roads in the y direction: y- b: K$ l2 m+ D4 z
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if8 e5 M- G) A. c" c% h
                           ;; it is to accelerate or decelerate5 O6 X, V+ r& |, x% ^/ R( D7 {/ N
  phase                    ;; keeps track of the phase
; ~) o1 H8 Z5 i4 L1 I6 ^) h7 n  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
" ^; S/ n. q4 R  current-light            ;; the currently selected light6 _* Z# u8 l) t/ Y
4 ?2 V- V7 W9 o
  ;; patch agentsets* O! ^* O8 a1 b  ?" u
  intersections ;; agentset containing the patches that are intersections
3 P9 x2 I5 x7 ]6 v, V7 v  roads         ;; agentset containing the patches that are roads
: G; D: a' H$ Y# Z" A]7 I2 |$ E& a- B7 o+ A! H
6 G, z' `1 R0 B7 ^7 O- o
turtles-own* ~& \6 G( ?% o: E
[9 O/ H1 ~; D. q" i9 f5 w5 G
  speed     ;; the speed of the turtle
* w, _3 k6 M' U2 J  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
: ]; w: {) x  n" l! k& a0 G& T  wait-time ;; the amount of time since the last time a turtle has moved
- ~6 ?- k/ ]$ {3 D) D8 v]. R: c# f+ z7 x, [: H2 C

' i6 f3 S- c4 d( E& Upatches-own
- i1 }, C" y2 p. [; {8 ][, V% Q. `5 S* i5 m: ~: p" o
  intersection?   ;; true if the patch is at the intersection of two roads
4 w. k6 Q& t+ M  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
, `  {1 `! k& Z0 B" p6 [                  ;; false for a non-intersection patches.9 ~+ [- r2 H6 G% h8 V0 l: |! P- W7 G
  my-row          ;; the row of the intersection counting from the upper left corner of the9 D! F+ P* n5 D' y9 D2 w: Q( @
                  ;; world.  -1 for non-intersection patches.
4 v0 X* V9 g  u3 r) z! I* o: F  my-column       ;; the column of the intersection counting from the upper left corner of the
. Q6 C; S. j6 t                  ;; world.  -1 for non-intersection patches.; w# }3 P8 A5 h. ^$ B9 C# U
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
2 G3 t3 i/ K/ A3 `1 N* Q  auto?           ;; whether or not this intersection will switch automatically.8 b# `2 f. S& B" Z' I+ @
                  ;; false for non-intersection patches.
! F8 b& N5 U: \/ m5 L7 f$ [; R  H]
1 Z; v5 N0 Y3 I" J
* B( q% B/ F& p9 h: e0 }/ t! C8 z0 M) P. w# }( g
;;;;;;;;;;;;;;;;;;;;;;+ W7 X: L& q) t/ c7 u! F
;; Setup Procedures ;;4 J: T1 W3 V# u, ?
;;;;;;;;;;;;;;;;;;;;;;; S* \7 m6 N( a9 K/ ~$ V# {) y

0 h1 ^+ [2 U  o  w. p4 x;; Initialize the display by giving the global and patch variables initial values.& z% s0 m; d- ?: I* L7 |
;; Create num-cars of turtles if there are enough road patches for one turtle to
9 ?9 u1 A! c8 t& U$ a5 G: S/ l4 \+ O( V;; be created per road patch. Set up the plots.8 u; P, W7 o  Y) \2 s- w6 J
to setup
: S) s2 O5 r5 Y) x7 ^" t9 t  ca
4 s: H+ p4 Y  v8 Q0 r  setup-globals
+ H4 ~' Y+ g0 H3 `% x, G2 ^# v2 g8 n
  ;; First we ask the patches to draw themselves and set up a few variables& {" K: h- V2 s' e- b5 u
  setup-patches
' M' F1 ]- t$ [  make-current one-of intersections
: d4 r" Y* s, ]  label-current* L  x/ f$ r; {9 T

' H7 H7 a1 a4 F" z' p" d& A! z  set-default-shape turtles "car"1 j( p* C1 |* X3 X! d4 q0 }: `
' q1 q; c5 i+ |1 a% _  D) n! T
  if (num-cars > count roads)
1 d8 S1 |6 f) I  [
; x9 y9 C% ?+ \' K+ P    user-message (word "There are too many cars for the amount of "
. z2 E4 p8 C! j1 S                       "road.  Either increase the amount of roads "
: T- v& W& P% F/ k1 u4 F                       "by increasing the GRID-SIZE-X or "% I+ b) s9 R: @% n
                       "GRID-SIZE-Y sliders, or decrease the "7 \3 G. g& S* n! ~% Z
                       "number of cars by lowering the NUMBER slider.\n"
9 |, u) [! D( Q4 f5 E# h                       "The setup has stopped.")! l2 ^8 J  }6 d0 Y' \7 z! o& D
    stop
' X' P% ~# v  r& J  ]/ P: W: D3 U( ^' K* Q3 l- W

: K& f" i" C, H- A) c, e$ {9 k  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color: f  d' Q: S% ~9 N
  crt num-cars
: K0 \- w. C% J. b  [) `- ]5 r8 _- I0 y6 k5 }
    setup-cars1 Y" O$ {4 e0 \$ Z2 A% \
    set-car-color
/ M( i2 f7 C! X: c" X, I+ T) C/ q    record-data
, |8 s3 z# l3 P* h  ]' y1 J$ Z0 Z- p& s; S9 V
0 e2 {; n  W  b- D% A# [/ v3 W
  ;; give the turtles an initial speed
, c2 G7 h; y& F9 ~# W$ @6 b" b. ]  ask turtles [ set-car-speed ]  s  X! |1 @* O1 n6 m0 W8 w& C

) v1 T' w2 H: U+ X0 a  reset-ticks
' d. P, b% j# Q) R1 n( eend
$ i5 ^3 M* K( l* }. B7 }5 [2 N, u0 R% d2 l7 W" W+ L( c8 M) i
;; Initialize the global variables to appropriate values
& f6 X0 P8 m& ^+ v( y7 @7 h! J% Yto setup-globals
* c* \7 C1 z) u/ `  set current-light nobody ;; just for now, since there are no lights yet- ]9 y. F8 k9 T# M
  set phase 01 R' t! Y9 M' D, L1 j* q
  set num-cars-stopped 0. u7 p' n. @# @4 \9 v& ^* t3 b* T
  set grid-x-inc world-width / grid-size-x
. v% V4 ]4 [8 O9 u/ E8 u5 a  set grid-y-inc world-height / grid-size-y1 u  ~& M" ?: c- b& \4 |" i

4 l: w& g7 S* Z# i! w9 M  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
, @5 k; L0 l* X1 X  set acceleration 0.099# ^4 O4 c. J3 G! R( ]
end9 J: m9 ?7 d+ _) B8 n+ M
  f4 {" T3 v* Z- R0 B% I9 g( o
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,# G8 b" J8 K" ]5 r' {5 a' W! a
;; and initialize the traffic lights to one setting" g' z" v& l1 L2 J. s0 i8 k3 V
to setup-patches8 t0 f) A% Z. z' ]# T3 H, H# o$ W
  ;; initialize the patch-owned variables and color the patches to a base-color+ D% Z6 j! V: j5 i
  ask patches
/ X/ Z% Z! v, B7 s% o* ?# T$ ^  [
5 G6 ~+ }+ j% U3 ?7 x    set intersection? false* H2 b! N3 a. R) d* L: N( }/ w
    set auto? false) w* ?& f: j; Z/ Q# j: e8 m) \+ o# i
    set green-light-up? true* G7 h0 U2 {$ z  Q( C; h5 q$ K5 o
    set my-row -11 S5 ]( K* k' Q0 i  k
    set my-column -1/ [  Y. ^* ~( @7 Y( ^0 @
    set my-phase -1: e6 Y. o& R% [
    set pcolor brown + 3
. [8 Q" S/ G# g6 S/ c  B  ]
6 E7 G6 W6 A* R" i! q; L: ?  J+ y- C
  ;; initialize the global variables that hold patch agentsets' k! C- H% E0 k# `3 ]- h/ ~3 M
  set roads patches with" y/ |5 k+ @+ |6 ~
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 }0 E5 [% X/ _: K; K8 Z1 E
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) p9 M$ |' K4 l! \+ x% R
  set intersections roads with
& {- O( ?6 N6 c0 U    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
7 s% h" r; [% m3 X1 b8 c2 \5 b    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' `2 u; w6 O  q) n9 J. |* g

1 ?2 r& W0 G# T0 ?! m) C  ask roads [ set pcolor white ]
: Y. l1 ]' f: I$ ]7 B% J4 l$ s    setup-intersections
6 B( e, P5 l! aend
0 b8 X7 s) @) v  u! |' N9 L其中定义道路的句子,如下所示,是什么意思啊?: a$ b3 }1 A/ X) B
set roads patches with
+ V2 ?6 `$ v1 J$ X6 f' J/ [    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. U, M1 Z: ~( D  V    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 ?& B3 w" ?6 @. [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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