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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。+ M; p9 }; |& {5 e6 k
netlogo自带的social science--traffic grid这一例子当中,# n9 p0 @! C5 j
globals
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  grid-x-inc               ;; the amount of patches in between two roads in the x direction
  R4 |0 T4 I) \2 a0 N  grid-y-inc               ;; the amount of patches in between two roads in the y direction4 A  U, L6 N$ O9 N
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
+ B1 x1 Z) t  Q. i7 r8 v2 `/ z0 H                           ;; it is to accelerate or decelerate
8 R& ~  {0 D' q* Y3 k( N* {  phase                    ;; keeps track of the phase8 l3 q! o) O- [0 T& G- w7 }: s+ a
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure! E' W: \# Y% N9 R$ N- j0 w/ W# o
  current-light            ;; the currently selected light, t" j$ F, @: D: `5 \
& u) v6 I" M# G( }" q
  ;; patch agentsets
/ Y+ L& |4 g7 K" ]  intersections ;; agentset containing the patches that are intersections0 D( _  N/ J, Q% P
  roads         ;; agentset containing the patches that are roads
! `  ?5 z2 O2 J( k5 B+ f]5 w2 q) s: Z. B2 E5 Z! g6 M
( v2 ^' t! t1 E  A* U
turtles-own
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5 m, U4 n, v) g. K- Q  speed     ;; the speed of the turtle: `3 ?( ?1 [  L6 Z
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right7 x0 u" p) M4 G- A7 l5 K
  wait-time ;; the amount of time since the last time a turtle has moved
0 k! P% H! L2 t4 |  h]: t  y8 y' W7 l7 a- S

8 j% Q( d( Y  S/ [0 j8 L  a6 Spatches-own+ R3 F7 U# h# z2 R! {8 S
[
" a+ U* W! A5 h5 v: \1 q  intersection?   ;; true if the patch is at the intersection of two roads$ P5 b9 b3 J1 I4 o6 G5 N% {
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
/ M. g( b% V1 T% W                  ;; false for a non-intersection patches.
. R4 t# d( ^* z+ W; R0 r- H  my-row          ;; the row of the intersection counting from the upper left corner of the3 {' ?1 V) D" s, l" y
                  ;; world.  -1 for non-intersection patches.0 T/ |. N/ o& v% K
  my-column       ;; the column of the intersection counting from the upper left corner of the
; ?! K' m+ c" y% ^6 j* F5 R1 C( _                  ;; world.  -1 for non-intersection patches.
: \2 T/ J# z* V8 C/ C- e  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.0 x: D2 \# b* r. G" d, U+ j( k
  auto?           ;; whether or not this intersection will switch automatically.# R0 Q' }. V( a
                  ;; false for non-intersection patches.
7 T" E, ?3 r1 V! |! t% [( `+ ~]& T$ F  Y: W' [0 F4 W
  ]0 q  Y* y9 t6 u# H- v
1 i: A; q. M  A. h
;;;;;;;;;;;;;;;;;;;;;;
0 n) P4 v& n: D+ n7 b;; Setup Procedures ;;5 K" r( W: ]% }6 q( m
;;;;;;;;;;;;;;;;;;;;;;
  y: H) n! w, c; S# I- R
2 ]; G7 W8 f- P0 g7 `;; Initialize the display by giving the global and patch variables initial values.. {. a7 n$ B" O  T8 c: x/ C" p$ @
;; Create num-cars of turtles if there are enough road patches for one turtle to
* f' H& }" L$ y# q' n( n/ H+ z5 ?;; be created per road patch. Set up the plots." a% T+ x( J, N+ `: e
to setup
3 P8 b, L4 U5 D  ca) o# b3 }5 x' ~" X
  setup-globals
$ s: F$ T! m* f5 V" h8 r0 u8 y) v5 B2 Z
  ;; First we ask the patches to draw themselves and set up a few variables
' m& C, _' h2 \$ }  setup-patches
5 r$ H9 ]  }5 t$ S1 g0 B0 f  make-current one-of intersections
; @" Y" ~' W2 `$ N0 O* ]( f( K$ Y  label-current
1 m. ?  p/ q$ {/ F; A: K* T7 E4 q; W
  set-default-shape turtles "car". }8 ]8 I; F" K  q
6 j. W. l, y( T& H" s3 q3 y
  if (num-cars > count roads): N% {" j+ v, d# D0 w( S5 {
  [- M% ^" I: q# W) a
    user-message (word "There are too many cars for the amount of "4 d& @3 n/ C# U  ]
                       "road.  Either increase the amount of roads "1 [# M% B4 a$ h+ s* Z$ J
                       "by increasing the GRID-SIZE-X or "
( r6 I7 Z" m3 |# o- N9 b1 X3 _4 }                       "GRID-SIZE-Y sliders, or decrease the "
' L9 g* f3 j$ A: l+ [. j* e9 l                       "number of cars by lowering the NUMBER slider.\n"
8 a- `8 ]6 q( t# q                       "The setup has stopped.")2 ?$ X/ M( q' \( p
    stop
' c7 o% T5 U1 c/ P" @  g' Q: [  ]
% |4 C2 t6 M/ J$ Z
) b" b- U" O# N* T: M" U  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
4 Q. e$ X. J$ Y" Y4 a2 j  crt num-cars% e. v: J4 {! F/ u3 i3 H  B6 `
  [. {( Q8 A/ G( K: U2 d  S
    setup-cars' H3 L+ l' i  S- ?% p( q
    set-car-color
9 S1 {) o1 ?/ F! h) k# q; z- Y, {    record-data
+ F- ]3 I0 Q; k3 b1 r  ]  q6 ?$ |* n; Q

! z! ^, N' n4 g9 r  ;; give the turtles an initial speed
5 \3 R) k6 L- ^$ P0 i: h  ask turtles [ set-car-speed ]+ O' T/ S# k2 ]' m8 b8 O) H
/ b) @0 K  k# K, T5 }: C1 P
  reset-ticks
- Y, T# T1 N# n. d4 v/ Aend# |5 N! G$ U* i5 c* F4 L$ R
* Q" l# v9 b5 B8 G
;; Initialize the global variables to appropriate values
# i  o- W: l2 Y8 |to setup-globals
" z! c6 S/ b. ]  W% K8 R  set current-light nobody ;; just for now, since there are no lights yet
9 G8 b3 ^/ }9 f/ I+ ]! e6 L  set phase 0
( }5 p1 B- u4 K. `. M  set num-cars-stopped 04 d9 v2 s; ?. S, D4 \" H- \1 Y" P
  set grid-x-inc world-width / grid-size-x. j" K! t; f. z9 E- J! E) `
  set grid-y-inc world-height / grid-size-y
9 e' ?& a# i" U* z% `) X  a- K3 }! b' o; U
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
& [+ z# z  w8 H: d  set acceleration 0.0992 d' Y" [+ Y  r4 e+ G+ [
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 {. T. \: o& n- U1 m8 D;; and initialize the traffic lights to one setting2 M) j; L+ E- _- B' |; m! U6 r
to setup-patches
. H, a; }9 o) s8 S0 K* c1 r  ;; initialize the patch-owned variables and color the patches to a base-color& b/ p, Y: ~8 w( [1 A5 y
  ask patches/ s; r) t( u8 e; e# w( s9 F7 j
  [- t) s" n$ n% E
    set intersection? false1 u8 ^$ m' I' K- P: Z
    set auto? false
- B! c8 c( [6 _/ ~0 U4 b+ k    set green-light-up? true
1 O  I9 _1 P; q- \1 A( j: r    set my-row -1
, V: {+ M- Q- f5 n6 i* p3 A    set my-column -1
$ f" X# K5 X, ?6 c- X. b    set my-phase -1
) O0 E5 X3 W0 @5 i# a    set pcolor brown + 3
! Q3 N3 a6 }& k  ]
# }1 R3 M) L3 a  h8 }! J- F6 d
& B5 M6 {3 m5 p  ;; initialize the global variables that hold patch agentsets/ X+ `, Z4 w2 T! B8 {; T
  set roads patches with* X# ?( W% ?7 N5 |: j8 q
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 l- ?  W& M+ b' T
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 V) D5 Z3 W$ e  set intersections roads with5 _* o/ j  j, s5 ]& f5 `6 ]  ^+ i
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and0 d( u) ^/ J% [
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
  O3 B6 h  Z9 _4 `  \) f3 S) }+ J0 r
% G& K7 i6 h% \  ask roads [ set pcolor white ]! n" Y; R! n* W
    setup-intersections% |* C$ P. Z8 Y- [9 w, L) ^
end
; F( h3 Z$ d5 ~2 C其中定义道路的句子,如下所示,是什么意思啊?
1 f, k2 L' o! G( _" l$ k set roads patches with9 A& j( \4 ^. n
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 |) F3 N1 G8 U0 B) Y. V    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 i, k0 J# E# o, V) i6 K
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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