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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。
0 ~3 i: t5 y2 p" H% O3 O" l% u7 wnetlogo自带的social science--traffic grid这一例子当中," M$ s( \+ G# l; E6 N
globals
6 N6 H7 C% k: K9 Y8 j: Z" R[
0 z: [  I  E9 G( p" C  grid-x-inc               ;; the amount of patches in between two roads in the x direction7 g8 g6 t9 A1 J( A
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
8 A+ ]3 i: p6 v* ?% D+ {  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
3 {( Y; i0 y2 `, h8 ]                           ;; it is to accelerate or decelerate: i  ?/ E# _4 R  N4 U4 d& [. z
  phase                    ;; keeps track of the phase- j8 g1 `- @2 X8 t, C# v1 c) F
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
% X3 n: H& t9 i4 O5 t) Q, B3 Y  current-light            ;; the currently selected light5 L% |- z0 N. e
4 O, C' f! |, I" ]
  ;; patch agentsets0 m* Y4 x4 _. ~1 h$ A
  intersections ;; agentset containing the patches that are intersections$ o; h, F# z+ c& j2 b4 @- g
  roads         ;; agentset containing the patches that are roads8 j1 T& B# D3 W7 K6 H6 X" P7 h
]
3 j0 e, o5 H1 g8 u4 N: R
: T3 Y/ H, H) c  g: Bturtles-own
0 S# H/ q) j& ]& }8 G5 i[# u' K( N3 C2 R2 J3 k7 j- `
  speed     ;; the speed of the turtle6 O0 L/ J  w' f- |( z
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right5 Z7 S3 _, t8 m& L
  wait-time ;; the amount of time since the last time a turtle has moved
/ }6 o/ C# u# e3 e$ \) W. p# b]+ F$ k- y( U% U. {: z8 I& U
& b; }& U, D$ @, I
patches-own
4 b  w/ d/ ]- Y# Z[
* ^. h, e* q3 {* U+ d! \  intersection?   ;; true if the patch is at the intersection of two roads
9 {- z2 E$ X7 R; G. B5 g5 o& }  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.1 s0 }) r$ V" _- X
                  ;; false for a non-intersection patches.
/ b4 _! x# }) L  Y( m2 o  my-row          ;; the row of the intersection counting from the upper left corner of the. V! t$ e1 P# t5 \" {* n
                  ;; world.  -1 for non-intersection patches.
3 ]+ l) c/ L# o# w: v$ r  my-column       ;; the column of the intersection counting from the upper left corner of the5 }6 ?4 L0 ~- t  @$ Q
                  ;; world.  -1 for non-intersection patches.) {4 i! j9 l& ]6 o
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
3 c1 y+ h2 o+ Q5 H) O- D  auto?           ;; whether or not this intersection will switch automatically.8 }* O5 Y! {7 g) t
                  ;; false for non-intersection patches.
/ ~8 p: \/ N: c+ L. i1 G$ X; z]* }/ l2 p1 c  E! x1 T4 o' |. b

  |/ {5 Z9 H. O) g, u  ?8 L- V# K& K6 K3 h1 f% M. V
;;;;;;;;;;;;;;;;;;;;;;3 `. B7 E' Z: c/ t2 B# V
;; Setup Procedures ;;# p- T$ @  i1 Q6 U
;;;;;;;;;;;;;;;;;;;;;;
! T# B& \8 n, u/ f" u' I! j- i  j0 ]0 i' _
;; Initialize the display by giving the global and patch variables initial values.
7 G$ V. M( f0 N;; Create num-cars of turtles if there are enough road patches for one turtle to
/ L  q  i, i: H5 P) N. Y1 }5 g;; be created per road patch. Set up the plots.- I: @0 x8 z! z, U
to setup
/ w; q' H. {+ u5 K! E  ca9 J; f5 h/ \8 I3 z
  setup-globals
9 y* T, ~' R' S
: @& p* s9 Z& M! B, b  ;; First we ask the patches to draw themselves and set up a few variables
- F, y% A/ }$ y+ ^2 J  q  setup-patches6 Q  n4 z8 B" j, h8 U" h% \
  make-current one-of intersections; a9 F3 }3 _$ G+ ?6 m
  label-current
" Q4 ^$ K+ O) p$ [% d4 k% {# w4 q! U* j* L' n7 @+ U
  set-default-shape turtles "car"
( {2 J( `4 N5 R4 j) E2 R. r  R: ^4 O& A. l4 h/ A# {4 L! u# p5 l
  if (num-cars > count roads)
7 ?5 j' t' @4 U+ h  [
2 i3 {6 i- L$ n    user-message (word "There are too many cars for the amount of "
5 [( V6 C, k3 R' B# N4 z                       "road.  Either increase the amount of roads "0 ?4 w: r! i$ \& C
                       "by increasing the GRID-SIZE-X or ": S$ Q6 m. Z$ D
                       "GRID-SIZE-Y sliders, or decrease the "9 H3 i: W9 A1 C) X; W+ v  V
                       "number of cars by lowering the NUMBER slider.\n"7 H8 \1 I) K4 u; V8 U
                       "The setup has stopped.")
# L: g5 ^0 r: d# X* w- _' C+ |    stop
; r+ O' t1 D; i2 n8 k7 R  ]6 p" ^- P# x) t
. `& P/ a% G. n
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color4 m6 b& F$ I- n3 y
  crt num-cars& R7 I) B7 N7 g6 f) f# C
  [
' s2 k$ V$ u, L4 Y. f# J. y. g    setup-cars; V# g, o2 ^8 ~: {
    set-car-color
, Q0 h; }" k* L4 M. h. Z    record-data
6 Q  N* x/ F' B* a  ]
8 o; I, Z; [1 U5 q3 l5 M+ l4 G1 o
  ;; give the turtles an initial speed$ y( X5 l- b, a
  ask turtles [ set-car-speed ]
) a. p  E3 I7 v' R, e
+ B6 s/ r' k: Q: d  reset-ticks/ s- ^" K1 p, f1 E6 H
end
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2 x) S8 `1 p, G( u2 `# k* t;; Initialize the global variables to appropriate values
( C# h6 t3 `) T2 Hto setup-globals
: H( U4 `# n# x& @/ n  \4 Z! J  set current-light nobody ;; just for now, since there are no lights yet3 b5 I% X& X; l( K" I1 v6 q( y
  set phase 0) W8 ^- u2 Q6 o, P. W) J' l3 ]1 C* e
  set num-cars-stopped 0- ^0 T5 v7 L! x, m2 S9 d6 E# H* \
  set grid-x-inc world-width / grid-size-x
7 O; D" f; i2 T6 y6 {4 x' p  a  set grid-y-inc world-height / grid-size-y
# }3 R( B& v0 J0 v# Q
# f% |) Q) E1 \7 [  g8 Y  e  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary. y5 f; d6 `4 C2 P5 F. e
  set acceleration 0.099/ n* ~9 W( T9 n3 D% [
end- {* E* @* H8 S$ {# c: ]
4 O* m; t* |  J. ?
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,$ ]4 W* z4 c% ~5 D
;; and initialize the traffic lights to one setting
- f3 z2 Z8 y% o3 i* P, Z2 x" t/ Ito setup-patches
5 G* _( q9 Q1 g% a5 N) C) P) U  ;; initialize the patch-owned variables and color the patches to a base-color
5 g) B# U/ C( B3 M  ask patches2 `$ B1 H) i1 I) o
  [
+ Z# D" L2 J5 P    set intersection? false
: ]7 K. V4 D9 h) _    set auto? false
, S. ]7 D' o, C: S% p& R& K$ K    set green-light-up? true6 M; e1 F( w! v8 A: G8 ]
    set my-row -1, s2 Z! Q/ Y9 G. q- W
    set my-column -1/ Q1 F2 B, r. r. U- G& ^& V% G
    set my-phase -1- h% J7 p3 `6 V$ l" I
    set pcolor brown + 32 ]; b3 H, ]+ F
  ]
) i9 R- K# K9 P( `3 j; {. w" }6 p% a% }' l* W2 b& w! Q
  ;; initialize the global variables that hold patch agentsets" V/ ]3 m1 v0 c# U. j; J5 m
  set roads patches with
* v- w1 ]) _2 J, `    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 \% W: G* m0 j; l    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# ]" X" y3 ?' F3 K" N  set intersections roads with4 s$ B! }2 \0 K: L+ L# m' _
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
2 ~- {$ M: |8 a  _; s7 m    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ I: }# J# e6 M5 M& G

; Z* U& H3 r1 u  r  ask roads [ set pcolor white ]* e! Z1 ^2 T9 z) h
    setup-intersections) s* Q5 S6 ?( r# K; N
end
1 f0 V( H4 a3 x- s- c: N其中定义道路的句子,如下所示,是什么意思啊?( t: {0 t9 Z0 I" X/ r
set roads patches with+ I: N* L9 I" u( ]9 a
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 [+ X1 Q/ ]& I* }6 t    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ ~5 }8 N* x& A/ {+ v2 Z/ R  p% m
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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