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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。
- U) D0 w. @8 f8 e2 {netlogo自带的social science--traffic grid这一例子当中,' @+ w% k! l1 D" L( x
globals4 Q. S/ a1 e/ g* o+ n7 [
[
3 s+ ?0 k- A" s9 ?2 H  grid-x-inc               ;; the amount of patches in between two roads in the x direction5 s* r' l6 v2 N7 q
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
9 s, K6 [/ Z, |* s0 G# t+ t  acceleration             ;; the constant that controls how much a car speeds up or slows down by if; A3 ?& E  G$ l3 I: h
                           ;; it is to accelerate or decelerate% n8 Z6 n" I% g1 C" Y  E
  phase                    ;; keeps track of the phase+ J2 m( h  x  Y4 Z: j
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
) y: H. }( @5 q4 @- J8 k7 d  current-light            ;; the currently selected light
! V7 S& }3 }2 I3 o" |# f5 y$ i% C0 F; A" j# T
  ;; patch agentsets8 \% z0 y! g+ w+ }
  intersections ;; agentset containing the patches that are intersections- Y! X7 ^1 {; {2 {, G- o1 m3 c; F
  roads         ;; agentset containing the patches that are roads# x; E+ K" R9 T+ V. Z$ d8 m4 R9 u. \; \
]2 C3 |7 s% x* Q1 y& x

, p+ j, t6 f/ \/ \4 F& ~6 O9 }turtles-own
( u2 c& P2 v& I0 h) \% j$ v7 @" x! D[8 X3 P% w7 ]3 ^7 L
  speed     ;; the speed of the turtle
" c' Q- C+ S/ Q8 U, a  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
; w0 h( w$ f  @5 P( g7 @$ y5 Z. q  wait-time ;; the amount of time since the last time a turtle has moved% h+ Y! y. f# x7 v. X
]
# i' {9 k& n( Z9 V- {; O9 ?
+ _1 p5 {) v. R5 z. ppatches-own! `6 M3 w- f# ]! G4 t, [
[
0 u1 ]  J8 D* B: h% {3 F+ q  intersection?   ;; true if the patch is at the intersection of two roads
8 H& k' e7 H2 P: W2 v/ x  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
. C6 \' f! n& q* f- U- K, {                  ;; false for a non-intersection patches.
5 C: L4 f1 M7 i- J* @$ w4 n  t  my-row          ;; the row of the intersection counting from the upper left corner of the
( D8 h: {. G; T, r! {& \                  ;; world.  -1 for non-intersection patches.
$ E& p* r9 t& ?9 ^  my-column       ;; the column of the intersection counting from the upper left corner of the& K5 {0 R% z, c/ N- [
                  ;; world.  -1 for non-intersection patches.+ I7 Y# {) P' P* a
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
4 n- X# h: \6 l# Q9 r- v( J' P  auto?           ;; whether or not this intersection will switch automatically.
7 e' |! K2 J% S+ f$ T$ n9 ~                  ;; false for non-intersection patches.
. c4 W, T; O! l$ h]) T3 F9 U9 A/ ]8 X# V

7 b/ k# u" R" E, O
5 W6 A, \7 M! ^+ K+ x0 k, ?;;;;;;;;;;;;;;;;;;;;;;' q, s6 h9 ~5 l/ a8 [6 s
;; Setup Procedures ;;
; S+ |/ ?5 l/ b7 R;;;;;;;;;;;;;;;;;;;;;;
9 u7 k  `" q) ^0 x. e
) z, U* \! j) Q; H9 F5 X;; Initialize the display by giving the global and patch variables initial values.
. S/ m6 v6 g  V: H;; Create num-cars of turtles if there are enough road patches for one turtle to
/ y( k# ?5 v. X* n4 U;; be created per road patch. Set up the plots.
) `* s) o# y" X( bto setup
: q; i! N. m0 F2 u- ]$ q  ca; Y$ A% Y! d4 _7 P" A0 ~' v
  setup-globals
; T# I6 w6 d, [. \6 w* J( Z2 D4 B: _- J
  ;; First we ask the patches to draw themselves and set up a few variables) M* W  o, x& \2 w4 I) N# q
  setup-patches3 l* t$ c8 i; J/ U1 Z) P5 j
  make-current one-of intersections$ T; c& S6 Z6 o9 V0 v
  label-current
8 T0 s* l6 \) n; W! N& d" K' f* [& d" G) G
  set-default-shape turtles "car"1 O/ U, G$ {4 E  U6 R: u0 h
* B' u" @& |" H6 I
  if (num-cars > count roads)7 R) |/ o; C5 R$ p# T: u& d
  [
9 E. l$ u, W3 @4 P; B    user-message (word "There are too many cars for the amount of "
) [: _% I8 A- y                       "road.  Either increase the amount of roads "' z" z- p  W* `: t2 e4 Y& x- [
                       "by increasing the GRID-SIZE-X or "# l: ?2 Y) g/ p7 f- M: G; ]% f
                       "GRID-SIZE-Y sliders, or decrease the "
* d: p; a! e8 K& A" c& z  \                       "number of cars by lowering the NUMBER slider.\n"
6 N* z: a& U3 }                       "The setup has stopped.")* o$ Y- i$ L' n
    stop
, W" R  E! ~. K- G  ]
* B) z9 b" ~3 h# m3 w1 S9 q  G" F2 j! |0 ^, ~$ O8 T7 F2 q
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color& }: F+ @: {( l. g( w) U
  crt num-cars# O) R$ _6 d3 i& `
  [" P/ y# C1 k- U
    setup-cars* ]. U- t7 V0 Z7 Y% c" l1 `
    set-car-color
9 w1 M4 D1 X  u1 o    record-data/ U' ]  L" h& @9 u3 ?
  ]
, r4 l1 o2 y5 N- x
. ~% Z. C- K* J+ M  ;; give the turtles an initial speed8 v( N, a$ @- M2 L$ \
  ask turtles [ set-car-speed ]
# r& d3 \1 m/ x! g: B
# S% O4 t* h, {+ ~( Y  reset-ticks
: M1 \) m+ H6 j) D% K4 fend9 w* O* A* T2 V+ L
$ W. p0 `' e$ V  P  f( f) L0 a
;; Initialize the global variables to appropriate values9 M6 g4 X+ V$ x9 K  K
to setup-globals
7 G2 \  E3 q+ G  set current-light nobody ;; just for now, since there are no lights yet
; G/ \; S+ ^) a$ O  set phase 0: B5 _4 V: {) O9 W6 `
  set num-cars-stopped 0
& a9 ]2 K, X. i; t) e  set grid-x-inc world-width / grid-size-x
5 D! u4 H: f1 Y6 k$ A9 a  set grid-y-inc world-height / grid-size-y0 w, O( @8 z5 C, D
3 A7 h, {+ G$ Z5 F! V  M
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
3 _$ v3 Z! Z' N+ X! P" Y2 Y  set acceleration 0.099
+ D4 J* w$ r9 r2 aend
" T9 ?" T+ c6 Q. t* t$ p
# t8 Y' [' H+ S" i+ Q" f;; Make the patches have appropriate colors, set up the roads and intersections agentsets,8 x6 e, G/ z; r# L. K$ K. M
;; and initialize the traffic lights to one setting- D, j/ y( X+ \, L% m
to setup-patches
& E' {" k& [9 N7 I" @8 t5 ^  ;; initialize the patch-owned variables and color the patches to a base-color6 U  q  j3 _* y- n: L$ K
  ask patches% ~7 {6 k9 ]* t
  [
' z, n0 i6 U! L, f    set intersection? false/ M0 Z( s9 h0 I
    set auto? false/ d9 B) H. w4 O. U. _! A
    set green-light-up? true" b! K9 u% j) d8 `
    set my-row -1
8 V7 C- G0 ]6 D2 @8 O& I5 N    set my-column -1) N* I, R+ d8 i: `
    set my-phase -15 w7 H6 ]3 m  T( |/ K
    set pcolor brown + 3' }3 S& {$ m! u  D0 m7 T8 M
  ]# F3 w/ F4 l+ v6 E$ E3 {3 f
( d+ t8 h' E5 O3 K+ t. i. i
  ;; initialize the global variables that hold patch agentsets2 ]0 Z# j3 ~2 R" W
  set roads patches with
+ ]1 ]: x8 I2 Z( R5 X    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; ]6 J0 L9 l% Z5 a% }# G; \    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- I7 F6 \% O3 B" m" g5 h. ^  set intersections roads with
. t7 B( H5 v5 ^8 X! C    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, y! K% ]) g: _/ Q2 y  R) H
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- v9 a/ q! w8 v$ q5 c; @  Y

2 ]; |/ ]4 u, V' x- D0 P  ask roads [ set pcolor white ]
* W( R( h9 i. A! V$ P    setup-intersections+ A9 a  ^9 {9 V/ [  Y* b7 b' S! y
end
* ?$ c; P; u' a0 U; w1 m1 D& Y其中定义道路的句子,如下所示,是什么意思啊?
& `" H' Q  k) r" T1 M! n set roads patches with
, r* ^8 i& \: W$ G' \( W    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' q) u( ?' r, H5 z
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) N/ l4 g2 m! R9 `) v; {2 e
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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