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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。
! x7 z4 W3 v! p  R. Tnetlogo自带的social science--traffic grid这一例子当中,
$ ]9 L1 o  Q# B* J/ g! ^globals
' ?- ^4 x1 D) d- R: c9 q$ ^[
& p/ W6 p% Z! s5 C3 W  grid-x-inc               ;; the amount of patches in between two roads in the x direction
0 R) g( J, q# c$ F  grid-y-inc               ;; the amount of patches in between two roads in the y direction
7 p# x0 a6 h# c7 u& I8 X1 P  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
; C+ g5 r  }& k3 K- u                           ;; it is to accelerate or decelerate
% M% o4 H+ R/ u1 z# g3 {: y5 E+ c, N  phase                    ;; keeps track of the phase
, i( m& w4 B$ Y  ~2 A  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
1 a" @8 U6 A( Y0 f  current-light            ;; the currently selected light
3 C6 s3 Z1 ~: m4 g3 B# c( D0 K2 G+ m
  ;; patch agentsets
: x; |' l% i0 d1 ]  intersections ;; agentset containing the patches that are intersections% \( z2 t4 h+ ^. j  ~% B" R
  roads         ;; agentset containing the patches that are roads
( q; y+ h9 h7 Z7 v; C1 v]8 a1 T8 j: k8 j
" y3 }7 y, n3 S6 }, q( h
turtles-own
. g; A: M, a8 R( R+ q9 G[  ?9 Z" Y( `7 x: A, d
  speed     ;; the speed of the turtle
! {7 u9 a0 x! E) M  up-car?   ;; true if the turtle moves downwards and false if it moves to the right# v& e; Q* [+ D2 {8 W
  wait-time ;; the amount of time since the last time a turtle has moved
: I4 w& O7 z& s]8 P* ^  T' J* i

  G" b/ T. N* t" ~patches-own! m8 R) G0 @, V" \
[
" G) J( N" i( Z  intersection?   ;; true if the patch is at the intersection of two roads
* J: c$ g( b! R1 ]8 M, N  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
# X( n9 K8 `9 u+ y! E  R; v                  ;; false for a non-intersection patches.( c7 L" O( u. a& T6 o
  my-row          ;; the row of the intersection counting from the upper left corner of the
' ]! X/ w2 x: {( s+ `, m# n                  ;; world.  -1 for non-intersection patches.
+ c* b% z+ H- z' v  my-column       ;; the column of the intersection counting from the upper left corner of the
* U& j' L8 n* Y6 v) j- N                  ;; world.  -1 for non-intersection patches.0 b2 N  K+ |7 [: s
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
+ }0 Q( x6 V" i/ \1 e  auto?           ;; whether or not this intersection will switch automatically.  O* }; p; w  S# R; W$ y
                  ;; false for non-intersection patches.
8 {) q3 s; ]  \3 X9 j# [* y]
1 Z# H# \/ \$ O- Q2 O9 R5 v& }8 ]7 R/ f+ O" `* |. `# d
4 T5 v5 ?! B+ `7 H5 E* F
;;;;;;;;;;;;;;;;;;;;;;
* l1 l4 \& P. R- @' J" w9 |& h- `;; Setup Procedures ;;
+ i8 T9 [# ?  v. r;;;;;;;;;;;;;;;;;;;;;;
- N% N. v8 ]( x  D; A& b/ A4 m9 d7 b% m
;; Initialize the display by giving the global and patch variables initial values.
* |! c9 R4 X2 w: k4 c2 Z# a;; Create num-cars of turtles if there are enough road patches for one turtle to3 P" ]  |' M( Y# k& X3 W
;; be created per road patch. Set up the plots.
; ?. ^  R8 u$ n# ^to setup
; p$ e2 L8 o" \+ V# O  ca4 j, F1 Y* i' Y) l) M( z. X
  setup-globals0 l/ N1 B% O( R4 _& m( v

  V; ~% @+ \6 Z. R' y, n/ s  ;; First we ask the patches to draw themselves and set up a few variables) |4 {& Z: F) i3 _* @, N' B
  setup-patches( w& S3 ?6 k1 @6 e, V$ J& b2 R
  make-current one-of intersections
; D3 o3 o0 _" F6 ~4 j  label-current/ _& {& P6 T. d* P$ q% J! d7 ?
. @. W+ A% k7 a# N
  set-default-shape turtles "car"  B4 b, S4 Z# Y7 f

% j  B- \# F2 h9 T& Z+ u- v: v  if (num-cars > count roads), Z8 i* I# O1 `- C
  [
+ x6 B" n. H/ m+ f6 h/ ^% L    user-message (word "There are too many cars for the amount of "
) r3 F: I% Q% o. O. Z% s                       "road.  Either increase the amount of roads ", }" G7 J+ `5 q  F2 N: t
                       "by increasing the GRID-SIZE-X or "
4 `, X3 G( C0 M# L. Z4 y                       "GRID-SIZE-Y sliders, or decrease the "& E$ k; L- ^7 ?% D, Y2 c. K
                       "number of cars by lowering the NUMBER slider.\n"% ~$ {2 @! N1 f  L6 M8 {% Q2 S0 J
                       "The setup has stopped.")
$ N" X$ C! i/ i; z    stop
8 f$ z8 w& u* Z4 |: u5 _3 z& `% V  ]3 d) Y' E' `6 h8 ^  `* m) T' s

6 Z0 W  A' `- F  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
2 I8 f! q* F/ Y) y" U9 q; R  crt num-cars* [9 v6 n7 I$ B8 |
  [0 ^4 }( m0 L+ P3 D+ e
    setup-cars4 {5 B' F; r: C* E/ ]( l# r$ C
    set-car-color- u  k; |0 @9 l' i% ]* h5 u5 y  K
    record-data
# ~9 A* y. K4 v. M& e: y3 S  ], m. j% u. `4 N# ^7 G+ e" @
7 P0 K# Y1 Q* m4 k4 `! g, L% @
  ;; give the turtles an initial speed
% n, c6 b0 D1 `* q4 g9 w: I' Y  ask turtles [ set-car-speed ]
4 Y: @: u% v/ m1 S: k0 ~8 c. e: Z. A2 r. o! w
  reset-ticks
, A2 e1 l7 `+ Q  wend8 J. {# ^* h7 O# w: f7 f! j- i+ u

0 b! v$ D6 h/ N  a1 J9 I;; Initialize the global variables to appropriate values
* d: |  a: z+ F5 Mto setup-globals; |' o3 a% s( Q' d5 n- @' @& ~
  set current-light nobody ;; just for now, since there are no lights yet
7 l9 l4 h8 D3 j) h, J' H  set phase 0
7 G) q+ J# S4 X, _3 ~5 J  set num-cars-stopped 0
- e) P- L& D3 ]5 k2 u* Z2 K  set grid-x-inc world-width / grid-size-x
" ^3 L* \. c! c8 {  set grid-y-inc world-height / grid-size-y5 ^; {0 v) f* `) P- G

. I: U+ [5 P9 A( v* l4 E5 [# z* \8 J  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
, V# W7 ]0 `  G, F  set acceleration 0.0994 \' V& I& J8 _6 u  r5 Q& @/ h
end
* z2 B0 ?6 _, }
  ~1 [6 o3 d, K; L;; Make the patches have appropriate colors, set up the roads and intersections agentsets,+ L7 e- |$ T! n- @2 R
;; and initialize the traffic lights to one setting
; b6 s5 u; Q6 v$ d( T& t3 {to setup-patches1 G5 C3 l5 D9 y% m. j
  ;; initialize the patch-owned variables and color the patches to a base-color' Z* l& J2 f9 D' B( {0 T$ w) Q
  ask patches8 }$ t4 D  s. |' W# ~$ |; Q! F
  [
4 N5 r, ^6 I" I4 f* g    set intersection? false
' M/ L$ n, Q8 u1 I  I9 I    set auto? false5 \3 X$ D* B3 \" u& T3 c+ k
    set green-light-up? true
; S; J& c- `$ Y1 F, g. Z$ q    set my-row -1
5 z8 L2 [' ^& {% f    set my-column -1: `" t8 T4 M- [
    set my-phase -1; _* Q6 x2 N7 K& c1 H- g% i0 Y' [
    set pcolor brown + 3
- I7 G' p$ p1 V2 z; h  ]: c1 d0 k$ ?' e4 s! I4 p3 j5 @

# R" o  n: ~* x4 E( e, c8 @. i  ;; initialize the global variables that hold patch agentsets& Z: `+ c, H( Y* T: z; q
  set roads patches with' S. V6 f- |* a1 U9 K' U
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 l' f. A7 i& ~) j/ U) d$ a
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' @3 e8 y( G" f$ M0 h* F1 T4 d' V  set intersections roads with' ?( h4 h* U0 }! C1 I
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
: M0 `% z' h. q9 {    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( x, [* a4 a7 ?, X8 Y7 x5 I

! n. ~' h7 s- Z9 p/ y  ask roads [ set pcolor white ]2 w$ W1 ^1 C2 ^
    setup-intersections
" F* U( ^0 J0 B# k: Hend7 x; n/ j6 t" k' F, b4 J9 T! V
其中定义道路的句子,如下所示,是什么意思啊?9 J% W* f3 ~# W: p6 `0 q
set roads patches with
5 n7 D* @& w: F    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 u( t: w' }* b/ p4 j( M
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' ~' l" W3 a* l. b
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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