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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。
' C0 P; V" n8 H; K0 [. qnetlogo自带的social science--traffic grid这一例子当中,
+ x, }4 s" h3 p7 c  U" C1 ]5 w, B) yglobals
4 {* s5 V1 Y3 t: _4 w" P7 N  R# U! d, P[# F% f" `3 c& V: _3 P; K+ y
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
# s# d# e1 r! `' ~- O& v1 ^8 B  grid-y-inc               ;; the amount of patches in between two roads in the y direction
- O; r& z: Z0 w# g5 F1 w8 z. _  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
# }" m1 j1 v5 p% o                           ;; it is to accelerate or decelerate
' d1 h/ k" l- q  phase                    ;; keeps track of the phase/ X* J6 u5 ^6 i) P4 R( ~
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
2 Y0 T# u4 E/ S# F: e+ ~  Y  current-light            ;; the currently selected light
) i) o! \  W6 k, d, X+ X4 L- ~& ^5 A- s' h  Q# ^
  ;; patch agentsets9 o1 ?8 k/ q9 m7 K- L
  intersections ;; agentset containing the patches that are intersections
, u; O. z& u7 |9 K' n. h  roads         ;; agentset containing the patches that are roads9 Y' H) i4 E& ^" J* n/ Z
]
& W6 x" l  l$ Z- R) A8 ^. N) S& g
+ b" D" |' \" K# uturtles-own
; F& m& B  w5 y: H5 C, I+ U- k[
1 {. j; d5 G& d  speed     ;; the speed of the turtle
& c% e& N- }& a  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
" b7 H" C4 R, X& n- v9 ~/ |6 q  wait-time ;; the amount of time since the last time a turtle has moved
  J+ t/ Z& H. R  M# D]
; Y# Z" w" O+ `* B0 q# V7 s7 p% q. A; F) F+ x% {9 S) g
patches-own
8 D; C! s) c+ C[
# w. R" ]. d! b  h5 s  intersection?   ;; true if the patch is at the intersection of two roads7 \  d7 p/ s3 ?! A( t) v
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.. v3 Q/ [. v; ?: r  c9 n8 c3 Z
                  ;; false for a non-intersection patches.2 I8 t5 l, L1 R- f# I1 D
  my-row          ;; the row of the intersection counting from the upper left corner of the) r, \  d9 `. E& E6 q# [
                  ;; world.  -1 for non-intersection patches.  F; }% d6 {) A8 L; Y* w
  my-column       ;; the column of the intersection counting from the upper left corner of the3 D" X; b* B7 s) t. c2 ~
                  ;; world.  -1 for non-intersection patches.7 m5 V, G, R. v: x
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
: O1 m9 G# r" q/ J' g4 `  auto?           ;; whether or not this intersection will switch automatically.; }# r5 A0 k) T, @- O; p5 e( [& V
                  ;; false for non-intersection patches.2 Z$ }& `; |0 m9 V& `2 e
]+ W3 E# _* C' v4 k

- z8 a! x1 M8 Y/ a& |) L* u
/ l) U$ h; \9 s1 ^3 t; p;;;;;;;;;;;;;;;;;;;;;;
$ n% k! U4 \" Q. M0 V* ]( J, C, N;; Setup Procedures ;;
  I3 F. N9 h& ~7 Z6 k0 o, `;;;;;;;;;;;;;;;;;;;;;;
2 I( q( s$ h5 f& n1 H6 z1 C1 q% ?' Y: N- x1 o- i+ S1 f
;; Initialize the display by giving the global and patch variables initial values.  [7 I: z" c9 s( i; C7 V+ E
;; Create num-cars of turtles if there are enough road patches for one turtle to
) r0 d) x; L6 O;; be created per road patch. Set up the plots.
  _7 T! d# M! S3 s9 R1 {) Yto setup
6 }  e* ^, V9 b+ l8 h  ca
$ z) Y  h2 V1 Z# @& [& Q+ X; S  setup-globals
* t1 a  G( x, d) ^* m% b$ `5 C
! h6 z. y" y+ W8 K  ;; First we ask the patches to draw themselves and set up a few variables2 O2 }9 R7 W2 ^
  setup-patches6 [) a0 U3 d% o; O
  make-current one-of intersections; a% Y- {+ |; H
  label-current  I6 j% n" z8 V- B1 Q; ?- N" n
0 m8 i. @2 Y9 S( D: A
  set-default-shape turtles "car"
5 D9 x8 M+ j; q$ @- z% d3 R3 T+ i2 J) w
  if (num-cars > count roads), a9 t+ s" ^0 A3 X' B
  [2 o9 i* o8 ^* z1 H& `8 [
    user-message (word "There are too many cars for the amount of "$ X+ [4 H  i2 [0 G
                       "road.  Either increase the amount of roads "
  O2 c$ {/ v6 ?' T                       "by increasing the GRID-SIZE-X or "
! P- Y# M, [6 p                       "GRID-SIZE-Y sliders, or decrease the ") [9 C. i$ z: K/ d& S
                       "number of cars by lowering the NUMBER slider.\n"8 w* v# D# Q, u, V* j4 l
                       "The setup has stopped.")7 K  z" x% }+ M4 n) h( W6 ~
    stop7 @! V* J6 {5 g+ u( Q
  ]
) C0 b8 g0 _8 P8 R7 H$ U- n6 k- h# X9 r1 C& F' r1 l4 F% B" z
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color, i0 k* z3 Z% K5 R# I
  crt num-cars" [& ^6 i! x/ {  f: z) f
  [
3 {9 `' X( N4 b    setup-cars$ [( y; d0 k( l  `. G5 Q$ t& i  O
    set-car-color
# V7 q; q' h  O. \0 q& N1 {    record-data# y0 c1 t/ A( R" d9 X7 b/ R9 t
  ]* p) f2 O# B1 _6 |. K( p4 e. x) T4 h7 W
! E3 }5 [- s* ~. ^, _! f& p
  ;; give the turtles an initial speed
- Q7 v  |# F4 k  ask turtles [ set-car-speed ]8 m2 S; D' y5 `/ S- [

( ?2 R1 j! J. `0 R5 Q, x, f( Y4 f- K: U  reset-ticks% t9 ^" p4 M3 w
end- d$ H$ G- A) g4 s
* [: j) L, z) V8 _7 x' B! ^4 F$ `
;; Initialize the global variables to appropriate values7 X2 z" r8 p% h+ \' Q
to setup-globals
; Z1 [0 l8 U  V- }  set current-light nobody ;; just for now, since there are no lights yet# y3 }/ w# C' O) t( _/ S6 b
  set phase 0
. g4 q! B& ?  u8 G' i- v  set num-cars-stopped 00 ]5 E6 t! G0 M+ M: p
  set grid-x-inc world-width / grid-size-x
; Q6 {' |$ h7 v  set grid-y-inc world-height / grid-size-y* B6 g9 e  n" z; h+ i. x

0 {& i& t5 i  Y/ s% E4 K$ k( S  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
/ X  y0 g. L2 s3 n  set acceleration 0.099
7 m7 d5 `5 j& g" H) t5 Uend
: L/ Z' Y8 F- Z# a' d0 s) z" b" U# ?1 J* B0 N7 U+ r$ J: J9 B
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,+ B( z, i) `/ |# X
;; and initialize the traffic lights to one setting+ E, \+ h# a& `5 l8 p0 j6 n
to setup-patches, c. U" u' J/ i/ `5 R# ^
  ;; initialize the patch-owned variables and color the patches to a base-color
3 G/ v% R4 r" e& O" ?2 _  ask patches
# ^) I# b3 G- ~7 n, Q6 ?  [' p! f- l' G, I7 }, y9 H
    set intersection? false
: ~+ Z# u, U3 i0 D6 D( r! ^    set auto? false
# n4 W/ q# h# h- J    set green-light-up? true$ e/ k* |4 Y) {- [( W
    set my-row -1
# ?3 M2 L/ N$ @9 ~5 h% y    set my-column -1
- P2 ~! C$ q: @$ @2 {+ B" d    set my-phase -1; a3 S! Z3 ^* Y& v1 I) x5 L+ q
    set pcolor brown + 35 E, l0 ~4 l/ f
  ]  q# p5 w9 y, Q  p: Y9 X
2 n. U7 q* o$ x+ z( g7 R
  ;; initialize the global variables that hold patch agentsets
! ?: Y. t7 d8 @2 v  set roads patches with+ {+ h) W, G" `, |' S% F
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* ^1 ~4 [( ^  N9 ?- a1 {+ H, e    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 i* X. f# E' S! ]$ ~
  set intersections roads with
7 l! d8 [1 n8 f. M- j0 r    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 n; ?2 {1 X) u; X( p& V- b    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# M0 ?/ t6 D5 e9 [

' `$ i; A, C2 Y6 Z* T$ L: F# s  ask roads [ set pcolor white ]
3 M4 s/ e( i2 h4 m0 ]* V: H2 {/ y    setup-intersections
) |- W# @. Y/ A: h) [9 S  P3 B( `& ]! Jend5 B- Z, f" O3 F
其中定义道路的句子,如下所示,是什么意思啊?
5 O6 v5 E7 S- g' H3 ]" _4 T set roads patches with; e( W, W8 \+ t+ W/ R( I
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% |" Q6 r7 \, d
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- e$ N& o: L5 Q5 H& K/ D
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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