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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。
3 k6 Z* }0 r" M" `  D- u* m3 B% t- Wnetlogo自带的social science--traffic grid这一例子当中,  U  u; W1 F# ~* I7 T2 x) s' z
globals9 n6 `$ l- u* E3 S; R7 O/ P2 N
[3 j/ @( x/ |, A! _
  grid-x-inc               ;; the amount of patches in between two roads in the x direction8 w+ Z6 j# q) ~% K, R8 ^, e: l1 D5 L
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
/ J$ Q$ X+ ]! M1 z  F) x  acceleration             ;; the constant that controls how much a car speeds up or slows down by if7 F7 R3 F, t. z
                           ;; it is to accelerate or decelerate
: z% n5 `& G; P0 L+ s  phase                    ;; keeps track of the phase1 t/ g8 n' J7 z/ _4 [
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure* D6 n# {/ o9 F% N' d
  current-light            ;; the currently selected light
+ V8 C% Z# ?2 E* e3 t. k" ~6 `; {( ?' _
  ;; patch agentsets
! Z1 G; @. _4 n" t6 n3 V5 i  E* v9 S  intersections ;; agentset containing the patches that are intersections
4 I9 Q8 ~: A: U' `  roads         ;; agentset containing the patches that are roads
0 m/ j  ]+ n5 m3 K7 v& P  j' ?  s]" I# M: h0 k# t! N  F$ D
9 k6 {: ]3 I* V. e% x+ V
turtles-own- m, d- h4 L, C+ s9 I* r
[% L$ H" _0 g/ \6 U
  speed     ;; the speed of the turtle8 r+ [" E6 r) z, v3 E/ v; W
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
( C' j$ I  B  S& k9 U  wait-time ;; the amount of time since the last time a turtle has moved3 R, T3 w. Q: G3 i0 V
]0 ^9 A, K* o- P% `9 N" p

1 F2 j% Y* T" q+ @patches-own; {0 n$ A1 v) Z8 e/ f% h
[3 M. s6 s2 _4 ~
  intersection?   ;; true if the patch is at the intersection of two roads- e: J$ Q$ m; R5 a. S- P% J: k3 Z
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false., G' U0 H# {2 h) }/ H4 I1 i6 `. V
                  ;; false for a non-intersection patches.
, F6 d: ]6 k7 y: X* \  r5 S  my-row          ;; the row of the intersection counting from the upper left corner of the3 x1 F( r% w- x+ N- Y& X/ h2 f
                  ;; world.  -1 for non-intersection patches.1 h% m) @7 q7 n! j
  my-column       ;; the column of the intersection counting from the upper left corner of the
9 _) m5 R2 u; ]- B. [                  ;; world.  -1 for non-intersection patches.: L0 Q$ I- @' k/ t- e- j7 b) d
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
. E& p+ f0 o! ?8 J  auto?           ;; whether or not this intersection will switch automatically.) k6 D7 V1 j3 A( i' ^
                  ;; false for non-intersection patches.+ ^/ U3 |( S5 @: d
]
- N9 N# d1 f( [6 t  z0 d
% _1 f: U. J" g
) }! H% V7 ?4 T% V; T;;;;;;;;;;;;;;;;;;;;;;2 W6 V& p0 x+ k4 N# T1 d7 i; T) a
;; Setup Procedures ;;3 {: p# |# G- u/ ^) x6 X, t  M! n8 ?; u
;;;;;;;;;;;;;;;;;;;;;;) Q, X6 V) L/ }5 Y5 D
/ j  B. X5 I% y# |, {
;; Initialize the display by giving the global and patch variables initial values.8 E/ ~; P2 Q7 w- k( }8 a/ z4 {% I
;; Create num-cars of turtles if there are enough road patches for one turtle to- j1 p  b/ {* y1 @- |
;; be created per road patch. Set up the plots.
' t. H9 g9 j) r  Mto setup  W5 |, B# i. R
  ca$ {: y' s% F5 ~8 v! k+ J( W2 \9 l: [
  setup-globals
3 r* r! N' u5 q9 t2 m; V) ^- R
+ X8 {: [* w1 U+ r0 V  ;; First we ask the patches to draw themselves and set up a few variables! ~  H$ @" c) a+ s/ @
  setup-patches: M2 |# ~: t* E* i& s3 j+ y
  make-current one-of intersections5 q$ w: j' M( V2 Y7 U, g
  label-current3 |' i5 @. E5 |, p: V* k% V

8 |2 w* y3 _7 j3 g5 y  set-default-shape turtles "car"" i. h- C2 X- o# x8 n/ H5 B2 y

6 ?' e& \, D( f$ Q  if (num-cars > count roads)4 |0 {( Z8 s( H8 K% v
  [
. D3 o0 j4 F- B- S    user-message (word "There are too many cars for the amount of "! s8 F$ ~# G, p
                       "road.  Either increase the amount of roads "4 ]5 M5 F0 ~; K5 U3 y, [# x  e
                       "by increasing the GRID-SIZE-X or "
- C* J3 W& f5 T$ s1 d+ `                       "GRID-SIZE-Y sliders, or decrease the ") w' c, k$ X8 _1 O" k" H1 N+ S
                       "number of cars by lowering the NUMBER slider.\n"$ i8 T% V" P$ T/ J( B: {3 {& @  L
                       "The setup has stopped.")4 |* O# n1 o/ _! U9 z" L
    stop
# [, l8 g6 J  e- S3 n2 W  ]3 c7 C3 a- Q# C0 c( H) B" o! y6 k3 [6 x
1 X0 n  T1 w5 K9 L/ j8 e' x
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color7 p" x: L! s! [+ b& x; `
  crt num-cars
, |; }2 U$ z0 r& u  w* @  [7 @$ D1 j+ t3 g6 F  {
    setup-cars
$ k; |8 Q0 J( e0 B. Y    set-car-color* u6 _4 a9 N: X4 ~5 d
    record-data+ p0 Z) v- R3 z
  ]
4 l' G7 s5 P% r  L
3 S7 e5 ^3 ^1 F- H" p1 Z! ?  ;; give the turtles an initial speed
8 B9 _7 ]6 ?4 Z8 F3 H  U/ g  ask turtles [ set-car-speed ]4 p2 M, x( h' ]9 y# w( q% x& `; V
* d, {% |: d; ^  c1 |* n1 m. c7 G
  reset-ticks( x4 g9 i' K8 d/ S1 f/ r  A
end
6 e. w" {5 W4 [2 X0 A, ^) k' z( ^/ |4 |3 X) @( ?
;; Initialize the global variables to appropriate values
; g2 X# w6 [) a5 d; L3 L9 N, gto setup-globals
$ x5 A; ?9 }3 ?3 u' c& V  set current-light nobody ;; just for now, since there are no lights yet
5 z, u+ X8 N) E. K% o# l8 L  set phase 0
/ M/ @- O% h4 z! O, C# ]  set num-cars-stopped 0
9 d& P. s- o; ]. ?  set grid-x-inc world-width / grid-size-x
" |7 M" C- _3 p2 Q5 D  set grid-y-inc world-height / grid-size-y
- I% d4 {% V8 D( F  r7 Y* H
6 {- Y* ^# o0 e  K) ~5 N  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
6 o% [: V% G; }9 p8 X* @  set acceleration 0.099  Z$ s" c9 B( P5 M9 m
end
* v7 W( U2 R8 K- H
$ ?1 H; t2 F% B# z;; Make the patches have appropriate colors, set up the roads and intersections agentsets,0 w0 X5 m9 b( s* v* w7 L9 F5 Y
;; and initialize the traffic lights to one setting5 K" {) A# F7 Q8 ]. r: Z- N3 d
to setup-patches2 h0 ^# D- o2 M; @' _8 y6 U
  ;; initialize the patch-owned variables and color the patches to a base-color
" m3 O+ T- B/ }. z. D& M  ask patches
' n2 N( X2 X9 V$ i; M0 `# \  [( e" w  P" q5 N
    set intersection? false2 @& s/ ?8 t8 c) Z+ h4 b$ T
    set auto? false
) C2 ?# }7 J% P2 X* @* K    set green-light-up? true
$ y8 h# E" r) ?6 m. [% H; K1 Z    set my-row -1' w0 u) M# V/ o& u6 T1 G
    set my-column -1
: d1 |# ]2 t- o* B' N    set my-phase -1
" W+ b$ {/ k& d# R    set pcolor brown + 36 a' U! Y. o, n
  ]
% R1 W) @2 F2 l) I5 {& P
+ E* S& d  `# d1 g# L; r5 P, \  ;; initialize the global variables that hold patch agentsets. T. o0 i7 ^, y' `* Z. E9 ~
  set roads patches with
* Q6 r/ {$ K, u, n    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# n' M$ g% A- @# D+ D- U
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ Z6 R3 o! P9 B6 y  set intersections roads with0 C) @4 e4 z5 `: {) }- ~2 d1 N
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
$ H2 C, B" B) \' D; S    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; y$ |# @( w- V* I8 Z2 e
8 r- Z/ r& D/ S8 f) T. K: v
  ask roads [ set pcolor white ]
& k7 P, ~2 \3 E) Z- X, e4 M    setup-intersections$ R% R7 ?- z/ m- t7 z
end
2 L/ i2 e! Z7 g1 K% f" |其中定义道路的句子,如下所示,是什么意思啊?; ~( \! p4 o5 C& X; U- R
set roads patches with2 y" P: _0 D) h9 J: F2 Q& K/ d% C% M2 Q
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- C* I9 N8 V% e0 d' R) F  `
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# A4 n7 r& S+ u7 G! M8 R2 T* 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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