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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。
. V( @* f2 d: ]% E0 Q/ C' p- ^netlogo自带的social science--traffic grid这一例子当中,# _: S( b  U  [' q1 T
globals% N0 m; r% W* k4 U' I  i, t2 {
[
' C! B( r0 |' e1 [5 u+ V' `! w$ f9 ?  grid-x-inc               ;; the amount of patches in between two roads in the x direction! j" x: N2 c: p  d6 M7 f
  grid-y-inc               ;; the amount of patches in between two roads in the y direction0 `+ X2 g8 ?$ [6 A% l6 H$ \
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
8 F5 ]8 u  N' Q9 _& |0 ]                           ;; it is to accelerate or decelerate
' V/ B9 P  b. l" |  phase                    ;; keeps track of the phase. x$ X9 r8 {$ c2 K4 [: W% R: _" N
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure# @" P+ ]/ Q5 `  B# S) a
  current-light            ;; the currently selected light' _0 y- q3 }( D
) O2 u" u* U- O
  ;; patch agentsets
" G  b5 r, h( ^  intersections ;; agentset containing the patches that are intersections
) ^. u0 f% c& w! `0 `, A  roads         ;; agentset containing the patches that are roads
5 O3 c% l& H% o]1 u2 L( n* [. N7 v

6 w- e3 }3 h# E: bturtles-own
) @2 A; J: B. v0 z+ e[
) y, o0 T" x' v, C2 G  speed     ;; the speed of the turtle
# ~3 ^) z# i3 e) o* W  up-car?   ;; true if the turtle moves downwards and false if it moves to the right( F# W' N$ M# l0 u
  wait-time ;; the amount of time since the last time a turtle has moved) b3 P) q- ~3 J. s8 X* f
]6 A5 b3 _$ G0 k* u1 P4 m: @% k* j
' H' ]+ L7 U, H7 e  f, H
patches-own7 @3 Z6 n. J! o; A+ F- u) N! R
[' d8 s5 u2 T' u) O! L+ h
  intersection?   ;; true if the patch is at the intersection of two roads3 z" M" s3 ~. b. v4 m( l- _
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
* h2 X& a. R, w0 z1 r5 ~                  ;; false for a non-intersection patches.3 g! t# d2 C4 T( {
  my-row          ;; the row of the intersection counting from the upper left corner of the8 }+ \& D0 ~9 H$ F  x' Z( [+ s$ m
                  ;; world.  -1 for non-intersection patches.
& Y3 ]) M4 V. D( \. G' _0 R5 A4 ?  my-column       ;; the column of the intersection counting from the upper left corner of the
" a% l1 @# T- Z1 x$ x                  ;; world.  -1 for non-intersection patches.
- T0 k+ ~) e1 ?; x2 O5 v' y1 b  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
& y$ U4 ?! v3 d+ g8 f  auto?           ;; whether or not this intersection will switch automatically.
5 Z# ~+ Y& q6 M. j' X                  ;; false for non-intersection patches.: H# |; g, B2 O2 |5 O4 h
]+ s- O+ g: ]$ R" c+ I

) l2 T( g" e* ~' @2 T* O% c+ b
+ H4 o! P& g2 o; r% _- Y;;;;;;;;;;;;;;;;;;;;;;
1 [7 O  E. M( B" J7 Y3 v$ u( m;; Setup Procedures ;;' V/ V: J, ^) j) u1 y4 X5 K! ^7 K
;;;;;;;;;;;;;;;;;;;;;;- I4 r6 ^4 c! s# Q# A# A
' G4 ?- m, P" A  \* f' u: M. ?
;; Initialize the display by giving the global and patch variables initial values.
7 r! k5 U* U! l" U0 O6 L' z7 P;; Create num-cars of turtles if there are enough road patches for one turtle to
* C# \: D" j& B! @;; be created per road patch. Set up the plots.
' N: d; A; N& Z% z, f" ]0 p* `, yto setup/ \9 v; L4 Z4 h. u! H
  ca  I9 X- `, S% D7 y: l+ R  i
  setup-globals9 w  p! k; m+ }1 Y! ?
3 ^( b& o$ U9 N& N3 _1 F  E/ z
  ;; First we ask the patches to draw themselves and set up a few variables
: k8 y8 m5 @2 s: _: D3 y% _  setup-patches
9 a) u3 }# |3 s  make-current one-of intersections
; ^. }/ g4 [6 ~9 C8 X  label-current+ _1 U$ ^' N. H% @; [
: ?9 _- M; M, }, m9 U  B, T) x& j
  set-default-shape turtles "car"
! X! \) ~, ]& l: y$ B% ~
( x% p2 r! ^3 M2 p1 |6 W8 }& @  if (num-cars > count roads)
& F$ r% v; l& N% Y& \1 n5 l% v$ K  [0 q' q; I' P1 }$ v. v- X( ~
    user-message (word "There are too many cars for the amount of "$ v0 G; A8 c4 H2 y- }% o9 ^
                       "road.  Either increase the amount of roads ", Y$ Y  Q. e+ o- v, C
                       "by increasing the GRID-SIZE-X or "
$ ?3 k2 o! J2 @* P9 p! O9 m                       "GRID-SIZE-Y sliders, or decrease the "
! _/ ^. J! M( X- a% x                       "number of cars by lowering the NUMBER slider.\n"
: w  Q/ V# l0 J9 [                       "The setup has stopped.")7 o+ R1 A6 N9 Z+ `4 \: n- H7 l
    stop
5 l0 O% t  ~! F3 o; R  ]2 D8 F0 ]/ w/ ~3 G! \. x2 c
: ~" K5 m7 `2 L* H% N8 a' s& b* f
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color2 e& l2 c, }. F; C, B# I
  crt num-cars
" \& Q7 Z' j( t  [
# m1 F; P3 y6 J. D3 ~1 F. x6 Y9 l$ d    setup-cars( O+ `1 A. L+ f! ?
    set-car-color% ^$ }% i- I0 p. ]' q9 t$ \
    record-data" |4 a9 ]5 D8 Y- u+ c% D) Q
  ]9 f" p0 R: Q5 Y+ {7 w$ n
* O( ]' B* H7 \* P
  ;; give the turtles an initial speed
% {7 D+ |  H, G' W9 B& F( {  ask turtles [ set-car-speed ]
" O0 p1 x6 n% Y, d" ^( N/ G: A& |$ d. ?3 [, ~! K
  reset-ticks
% Z) Z  k: \1 d& U+ a% m7 |* z6 }end" l1 b: j. n  ^7 M' S% K1 U1 u
6 V+ L2 L# T1 H: x$ N1 y
;; Initialize the global variables to appropriate values/ n# B& t5 R$ u  [7 o: d
to setup-globals
) l& i% h' b$ A  set current-light nobody ;; just for now, since there are no lights yet8 T* |2 Y; y. Y* J1 Z
  set phase 0* ~+ N! f& v' K: v$ Y" V( c
  set num-cars-stopped 0
2 \! u5 U0 p6 h; a  set grid-x-inc world-width / grid-size-x( U- V1 n- k# m! k* H6 Q$ ?# c  [
  set grid-y-inc world-height / grid-size-y$ [2 M0 b) Q3 D3 I& x3 p
. y+ J0 E2 B+ o. G! f
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
) |- v( r, f* V1 T6 H5 o8 {8 n( ?  set acceleration 0.099
0 s& D/ c9 w9 b3 i" A& ^6 c* jend# m- S5 U" i! e6 ?0 Q
% c  y* v" u- D$ x
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,6 |0 u: E( e: X6 j% a% f
;; and initialize the traffic lights to one setting  M" f4 s6 `6 z+ d# J& Z0 A
to setup-patches
9 S  t- w( k7 Z; q* h( N, M  ;; initialize the patch-owned variables and color the patches to a base-color8 [4 ~) t1 z  H" X5 j8 |
  ask patches0 r/ w8 p6 S% Q) h4 S
  [7 y3 b9 A+ X4 D  x$ g
    set intersection? false3 r: s2 A$ f+ O
    set auto? false
/ w$ M8 w+ [8 w4 h6 K1 A" Z    set green-light-up? true
5 l9 Q' u7 @: `) E: d    set my-row -1/ p& B( r; Z8 E9 t1 v5 n* w
    set my-column -1
# p; O: [) M: V9 N/ y9 N    set my-phase -1
/ A! ]3 r$ S0 h8 g/ y    set pcolor brown + 34 g% R+ m4 v& x$ L1 w  ?5 c
  ]/ f9 x; D7 l' Q* e$ s1 v* l

8 ^6 b2 K& \9 l7 w* k7 }1 R  ;; initialize the global variables that hold patch agentsets
0 B1 R9 X3 z0 E* W- z  set roads patches with
4 s0 {- x3 ?! F. S. d5 E    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% H. b. h' M& w8 v6 c: i8 I" t
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" ?1 X& M1 f; F  set intersections roads with2 y# O4 }8 l7 _6 {( ^
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
: z  |/ o8 T" z) b- b    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 N, s, u, ^5 n6 e, N0 Z/ ^1 t' {" s; Q& P7 ~+ M
  ask roads [ set pcolor white ]
4 f* u2 @8 X" f6 P    setup-intersections
9 w" |3 y, N4 _; n# {- I, Pend- F! u3 ~; a+ R0 N
其中定义道路的句子,如下所示,是什么意思啊?
* [3 a1 h9 }& c- E( c4 ~ set roads patches with: q+ i) B+ O1 l: b
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' {, q$ h1 R3 _- I) S+ h$ f
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 q( M; {/ o! P6 o) X6 o, ~/ e) M7 ^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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