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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 g% Y6 W( S1 s, i6 N# U+ mnetlogo自带的social science--traffic grid这一例子当中," v& j4 l! |6 L* v' a- ~
globals7 ]* w' p0 H* n4 A% v9 {; G% \
[) C1 P: |4 q- |' K. o5 @2 e: V
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
# p) S8 r$ n: n, j( K  grid-y-inc               ;; the amount of patches in between two roads in the y direction! V" \- @7 z' x. [
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
% O9 r5 H% l# G# t* p- V+ d- z                           ;; it is to accelerate or decelerate% [8 g( Z3 X0 K" K$ A4 u; Z- U$ {& L
  phase                    ;; keeps track of the phase# y$ Z* W& L* A
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure/ I* F! F: h! i, j( x& O# m" O
  current-light            ;; the currently selected light; a; d- K- F2 ~& G

7 r. k6 U# d* b$ L' A# B  ;; patch agentsets' F$ |, {5 _$ |$ t1 |0 V9 w
  intersections ;; agentset containing the patches that are intersections
( R+ q7 L# Y2 n9 d5 ~, A  roads         ;; agentset containing the patches that are roads4 L) J6 L/ X# m% i# K
]6 _9 P' t* _3 F4 d+ }8 T* M/ q
: P& c. i9 Q) x& _3 z2 @7 ~
turtles-own
: \6 l+ x5 [$ E% v[, c5 Q7 U" a+ C. G
  speed     ;; the speed of the turtle
3 U/ d9 B4 Q$ N: f' a3 B$ P  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
3 |; E/ S# \; L: c7 E  wait-time ;; the amount of time since the last time a turtle has moved
0 S. Q& \, V, B+ [, t5 T]' j% u/ _) z  c3 o

* W( M0 j% A- [/ y: B1 Z& E6 epatches-own" P3 ~* A0 [/ M/ c9 Q# p
[
% z2 a: w0 w; ]- m" D4 W" Z) V  intersection?   ;; true if the patch is at the intersection of two roads8 H4 C3 L- n  S7 u: F, c7 t
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.5 S  Y, D9 q1 s  k) N5 U8 n
                  ;; false for a non-intersection patches.7 N# z0 u7 j6 P7 e
  my-row          ;; the row of the intersection counting from the upper left corner of the
4 L7 X+ U: _$ L: `! R                  ;; world.  -1 for non-intersection patches./ K  ^1 x9 o" f3 @- @
  my-column       ;; the column of the intersection counting from the upper left corner of the
7 V& Z1 `7 k% L$ T, f. g5 J                  ;; world.  -1 for non-intersection patches./ g& [! I8 {  E6 S! s" v' B! c
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
* _' I: ~& P8 `! M/ ~, P  auto?           ;; whether or not this intersection will switch automatically.
* M3 b& a( o2 M                  ;; false for non-intersection patches.1 O" W. j( p$ s4 M
]
( t9 ^# x/ B+ A- v8 `' f5 k$ T! l" R# N  H( o
' v5 P2 j# Y0 {5 a5 O2 \
;;;;;;;;;;;;;;;;;;;;;;) }( Z1 ]2 A! M7 _* E! o
;; Setup Procedures ;;. |$ V# l+ C3 [5 }
;;;;;;;;;;;;;;;;;;;;;;2 m% `6 J2 V3 l9 n9 `" e
  l" t! I, _) _# C) f" u" M
;; Initialize the display by giving the global and patch variables initial values.4 r; h: O% C/ ^2 w5 b
;; Create num-cars of turtles if there are enough road patches for one turtle to! b3 D7 N5 r  w# o- `4 J3 `* L
;; be created per road patch. Set up the plots.
$ J9 y6 {+ J( d3 f3 Vto setup, I+ b4 K, J- K9 k
  ca
7 S- ~% K- H# b* t5 h6 `  setup-globals" C: T% N2 q# h

9 E- I* o# j6 X! q9 f& i( y  ;; First we ask the patches to draw themselves and set up a few variables* f; f9 h* O0 m+ S4 K  Y
  setup-patches
5 I6 }  ^3 g7 K" F- k+ i& C; w0 |  make-current one-of intersections* L) w8 A. s4 ]  ?
  label-current# F3 G  N' ?- S+ _
, X2 P  u" S6 j, Y4 a% d' H& _1 H* A
  set-default-shape turtles "car"
* u  u( g8 G! e- Q
. W4 Z8 X& q# c  if (num-cars > count roads)
( l1 |' I8 a/ M: C5 P  [
' k1 [% [. G6 H+ h    user-message (word "There are too many cars for the amount of "! t- Y3 R/ A% F2 d* T9 }$ {) Z. a
                       "road.  Either increase the amount of roads "7 n+ w1 \5 l$ f0 |" }' K
                       "by increasing the GRID-SIZE-X or "8 [4 _' _! j% _* ]
                       "GRID-SIZE-Y sliders, or decrease the ". [  b# K) |; H7 O) C
                       "number of cars by lowering the NUMBER slider.\n"( K4 Q7 n! P5 l/ C
                       "The setup has stopped.")
' }* h+ N$ r) W) H! n, E4 {7 o    stop
$ \' c+ `2 p; r, L* R" j( ]  ]% I# B3 l; |5 `: @  T9 u9 X0 {% O) u

5 g/ `9 y5 Y: e+ Q5 [! F  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
. N  C, ]# b+ n, @  crt num-cars7 }; t  D$ i9 G% [& b3 S$ P) h
  [' F/ r% G* c$ z3 e
    setup-cars. {. q- v# d! g& j$ m( D
    set-car-color
" D4 N- Q0 z& G" ?0 V    record-data! t. V3 q2 b  N2 H5 I; ~% s
  ]/ X8 \5 P5 ]/ k$ R* M
" d/ D" r7 e0 h# O
  ;; give the turtles an initial speed
. e; O! r( L0 S( N  ask turtles [ set-car-speed ]' H$ }3 P- w+ O/ C
& N  c) H1 t$ M7 u2 ^! U# j
  reset-ticks8 B" q6 J  K/ D  Z3 q3 Q
end2 W% E- k, f# a, R
$ v3 N0 K7 ^1 [: L8 L: G
;; Initialize the global variables to appropriate values
5 G- y) ]- e! X) _8 Q- g% m* Eto setup-globals% \# h, V0 [* }* m' W- V; q+ X, V% g7 P8 V
  set current-light nobody ;; just for now, since there are no lights yet
) h* m1 p3 A0 q  set phase 0
2 y9 o4 o1 n( D) }8 U0 I' m  set num-cars-stopped 0
6 h' x5 f" p) ^- L+ Q) Q$ e  set grid-x-inc world-width / grid-size-x
5 c, J- s0 Z( s! @  p7 K+ b1 f$ t  set grid-y-inc world-height / grid-size-y
  L) L; h" @, m1 l; {- T, A( u% `: \$ N$ t" h7 N8 M
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary- U2 l! o; V3 p) l
  set acceleration 0.0992 w% P- P8 V$ N7 i( W, C9 c
end4 S$ `& s# o& N$ L

: Z, {1 E0 E2 g;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
7 E8 u! G+ i% D4 p3 x# T3 I;; and initialize the traffic lights to one setting( e7 P, f( Y! C; F
to setup-patches! @6 C2 R, r' X! i/ w% H! E
  ;; initialize the patch-owned variables and color the patches to a base-color
& z* L; |4 Y# ]; g8 U3 m  ask patches$ P! `; f" ?# `4 z1 v
  [. r7 q1 t1 O( {! K7 U# c& W; C0 U
    set intersection? false
0 h$ W, ?( J5 G$ I' j    set auto? false
* @) R- K$ E2 K' @  C2 ^1 e2 M    set green-light-up? true7 x: H) }* z9 _5 r* f% U
    set my-row -1
! v- u8 v9 O+ i- t% l2 T8 F3 u    set my-column -1
. w& \  b/ h1 C    set my-phase -1
7 C* r/ z! H3 F) q& P# E    set pcolor brown + 3
) }* @1 f- b  [: k8 U  ]* c9 [9 m2 ~9 E/ u7 \

9 P9 F0 K3 K  f7 I! j; }' o  ;; initialize the global variables that hold patch agentsets3 U; ^; j' X6 a
  set roads patches with
% B7 K2 k+ c/ j# X- T8 V' U5 n' [$ Q    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 o9 ~, h& L( @
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# H! q3 V) i9 m# f. S3 E  set intersections roads with
2 q7 j2 t( E. s: w    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and8 A' W; v) A4 q
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 |, ?2 B3 ?) @& ^" q& t' P
* @4 Z0 m9 J# O( L% G. z  ask roads [ set pcolor white ]
: z6 @; U4 a$ F    setup-intersections/ n, J' t/ b; Z2 L$ |
end. W0 _, e, I  ^# j: Y1 p9 f
其中定义道路的句子,如下所示,是什么意思啊?
" `6 f( w9 r) h$ d& G! \8 l set roads patches with
: d1 M* @. E$ p0 U    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( L) S5 K# A  Y  T3 R
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 ]( D+ H% |! Q
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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