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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。
, p/ t+ d* v& G; n3 z+ v$ E3 K4 T" dnetlogo自带的social science--traffic grid这一例子当中,* [& d4 e: o& w7 Y7 H/ S/ i
globals
# h, S8 l2 @  o) f0 ]/ g' {8 R[
( f- i. N$ Z2 q  grid-x-inc               ;; the amount of patches in between two roads in the x direction
# G$ v0 W/ y1 W* O% w( I' g  grid-y-inc               ;; the amount of patches in between two roads in the y direction
- o' v9 L+ y' {* C3 J  t  acceleration             ;; the constant that controls how much a car speeds up or slows down by if% O" |1 b9 s  N% }0 r* d+ c4 m
                           ;; it is to accelerate or decelerate+ t5 t& I) g& q+ ^  k' I
  phase                    ;; keeps track of the phase& _3 K4 O7 i5 V" T
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
4 _+ Q( M# q, m9 [" j  current-light            ;; the currently selected light8 W6 z8 }1 ^7 m3 u4 e# k, B
6 z1 S* _2 _* c7 ^, \7 k1 @
  ;; patch agentsets
& B7 N0 f. N2 o  intersections ;; agentset containing the patches that are intersections
4 l! s: C8 f5 \8 W  f  R  roads         ;; agentset containing the patches that are roads
1 i( _6 y1 q7 k5 O. d* s2 w]
$ f) T) O/ c1 p  q- v- }/ t. U: \- j: N! K+ A8 v/ O
turtles-own+ D5 ?3 ^: d6 v$ _. w' z+ _
[
, V7 M$ w, M  O7 L4 l  speed     ;; the speed of the turtle/ e6 ?1 M$ _+ g- x! d: q
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
! V# b$ b  R' r, \( j  wait-time ;; the amount of time since the last time a turtle has moved
' L3 ^$ i' y1 D* J6 N3 x+ P5 ]]2 }8 _% H2 C7 M  }

) L, q, o4 N* V9 q5 r2 g$ Ipatches-own% P1 r* g6 U: \1 j/ V/ F
[
) e# D1 ~" r" w) L1 P. v: l  intersection?   ;; true if the patch is at the intersection of two roads
- j6 Y8 p5 I+ d7 |3 H8 J3 q1 O+ V( S  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.5 g+ Y3 F% J3 o6 S) q
                  ;; false for a non-intersection patches.
  E6 R3 O/ @! G' K) u5 E8 z  my-row          ;; the row of the intersection counting from the upper left corner of the& I2 H* X0 T8 T0 V8 Z8 h6 B- X; N
                  ;; world.  -1 for non-intersection patches.
4 m( }2 ]' }( s- Y4 t5 M  my-column       ;; the column of the intersection counting from the upper left corner of the$ I9 I, p. N0 {. x
                  ;; world.  -1 for non-intersection patches.1 y) R* {( T' E% i" R
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
2 s' K) M/ v9 X5 F) S  auto?           ;; whether or not this intersection will switch automatically.
0 Z. M4 n# G( a5 o) _9 g                  ;; false for non-intersection patches.
1 d4 ~: y3 o5 q( c2 D7 i]
% V- E3 k. |& w. F9 A6 c
4 q+ f( _% y9 @8 P1 j8 L7 _* S1 r2 ~2 P# b
;;;;;;;;;;;;;;;;;;;;;;
1 \! K# `  X& F( }  J;; Setup Procedures ;;6 ?8 w+ ?- d. U% r9 v' l
;;;;;;;;;;;;;;;;;;;;;;
; B2 g" _8 t. `$ N
3 d$ d# w9 D0 d( \;; Initialize the display by giving the global and patch variables initial values./ `+ n  R& v" l% E+ q; S+ X% m% v7 `
;; Create num-cars of turtles if there are enough road patches for one turtle to
$ {( i' G) ^, w* n0 O;; be created per road patch. Set up the plots.3 K+ E  c5 b* Q
to setup/ n* {& U& ]4 S: o8 X9 `
  ca5 O0 w# D. g2 Z1 N  X; \
  setup-globals- F$ M# N" d5 [: \7 q) [% ~- L2 k1 `( X
+ D: k# F) Y6 w* @- q; C: [3 t: _
  ;; First we ask the patches to draw themselves and set up a few variables
, `+ k$ K2 O0 o. I  setup-patches
' y2 b+ s- I/ r8 b  make-current one-of intersections6 O$ a8 J4 g6 n4 A
  label-current
6 V/ o# A! ?9 a  e: l7 C" x* T/ u0 q, R+ K
  set-default-shape turtles "car": j' V3 k( ?/ X) i! z. ~+ y* ^

* Z9 Y) X0 h; V  if (num-cars > count roads)/ P, c! p% w: O2 d* R) v
  [
  n5 x7 K7 L; g( ^, y1 g+ k+ |/ X    user-message (word "There are too many cars for the amount of "
! ~& {9 I# ~- S' W2 }+ P/ p                       "road.  Either increase the amount of roads ": J: H3 g7 b9 N; v0 P  ?
                       "by increasing the GRID-SIZE-X or "; p5 X/ Y( {& i. J0 o4 P* d& F& |" C, s
                       "GRID-SIZE-Y sliders, or decrease the "1 U2 @; ]* _6 d  F
                       "number of cars by lowering the NUMBER slider.\n"
1 Y) f! |' |3 D/ s# t# G2 A6 U7 t                       "The setup has stopped.")' L" j# _( o$ ^. U$ \  s0 W
    stop% R6 ^, ?4 A# j0 n9 S
  ]
2 H0 Z4 s# w; N
8 U( W7 _* Q& Q) \  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color: [1 l9 P( r2 r2 M7 t* |7 B: a
  crt num-cars# k! ]4 ^1 G2 }9 J. [& ?% [( H% Y$ z
  [6 B8 z# |# K. g+ L4 g. q
    setup-cars2 R9 J. \, c: Q
    set-car-color7 d0 Y' l9 h8 N3 R# K7 K! W
    record-data: e7 O! l& q3 E. G" H5 L: {
  ]3 K$ A; h: V& K; R, y4 W( P2 V. Y  J% I
' e# Z; ~' p! z4 v$ k7 m. [- n
  ;; give the turtles an initial speed
$ q1 ~& I" R) l0 d0 J# X  ask turtles [ set-car-speed ]6 B: k. e4 l& R7 L

" p8 }, V/ d3 F6 g  reset-ticks* L5 H6 @& b; G" C  ]  z1 [1 E. v
end
3 l2 X* D) K0 R; e* p9 d2 \# g0 H0 e) u- C5 S& Y
;; Initialize the global variables to appropriate values' t7 X2 z* I$ y; R+ ]) w
to setup-globals
+ e- I* l1 w: x8 g" v0 s7 ^/ a  set current-light nobody ;; just for now, since there are no lights yet
; z$ s) X( v: B0 l: z2 l  set phase 0) k) q3 i- V3 n7 |% o! u, y
  set num-cars-stopped 09 o# F3 H5 T, L- ]" |
  set grid-x-inc world-width / grid-size-x
/ J) H% |1 _9 X- `; g6 F1 ]  set grid-y-inc world-height / grid-size-y
" L  J) ~, I- R- H  f# S) L5 w! t1 {: t7 I/ ?% u, ?6 d0 u. V3 h; H
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
0 o9 D5 {4 b6 d1 w  set acceleration 0.099
& R/ u; d0 N% P- j& Aend2 D1 x& r" @& X# n5 C
( V* @5 ]. y" p9 z
;; Make the patches have appropriate colors, set up the roads and intersections agentsets," {( g- |7 {6 c7 F. h6 S& i
;; and initialize the traffic lights to one setting4 [3 S% K6 T' F6 ]% t( L- X, h. j
to setup-patches
" ^; h7 s2 t/ b& {  ;; initialize the patch-owned variables and color the patches to a base-color$ Y" `- v$ y6 Z1 e+ H; E1 e
  ask patches( B* W8 }) U& U" Y, q: F- z
  [
2 X5 Z+ q/ O; P, A7 `8 s    set intersection? false1 C8 |4 \! j4 ^" ]
    set auto? false
1 m3 w2 b7 Q( o$ G' [1 E/ X    set green-light-up? true0 N$ h) n: O# P( J9 p7 C4 y
    set my-row -1
( P$ [0 u" }) O, G5 }( w    set my-column -14 }7 E- C. X" b' x! i4 U4 [
    set my-phase -1& a& I. D2 \; E' w, ]3 d& J
    set pcolor brown + 3
  t% x8 O6 n3 [9 k% l  ]
! O% A8 ]' @& [1 v
& Q0 ?% w; E. G1 ]  ;; initialize the global variables that hold patch agentsets9 r+ U/ ]1 A3 M1 a
  set roads patches with
( m' C3 l2 Y7 Q. ^    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) B8 a5 Y! L- ^
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: ?4 v- ]' B' v: h3 j9 w0 w
  set intersections roads with
8 a' {# N/ x8 p5 t9 N: Q: A    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, ^7 g- g8 T+ s6 V
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 d$ h4 s6 l7 [( U' D5 h3 }% [. i3 }& B8 N
  ask roads [ set pcolor white ]6 m$ `+ E1 c! z# S/ ^* \( P
    setup-intersections$ @" w6 z: w/ _( B4 L8 b& @
end/ t2 g* @* U$ D$ w" p$ y- S  a0 U4 d1 G
其中定义道路的句子,如下所示,是什么意思啊?
! H, e# a( F3 }2 N1 N set roads patches with0 e1 k1 }  {& G2 h$ i
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 p2 f( S, H1 I0 m6 C8 M5 B
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* }4 f8 A: n1 R, F- G- U
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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