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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。
2 s: C/ C9 T" V# Jnetlogo自带的social science--traffic grid这一例子当中,
, X2 v2 a8 c* }) `$ wglobals
: d. O, m4 G7 N' B! J0 E& j2 d[- m+ I4 G$ N/ {' d
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
1 q% C$ }$ \" b" k' }  grid-y-inc               ;; the amount of patches in between two roads in the y direction+ v) j) [' B( N& s
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if3 R+ Q( L2 T4 M- s3 l
                           ;; it is to accelerate or decelerate
7 K4 `5 p4 {6 |( ?5 p  phase                    ;; keeps track of the phase
- Z6 s. S0 ]( [5 s  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure- @% b0 R! [, c; o2 [/ T, k5 L
  current-light            ;; the currently selected light. b/ A3 `1 `$ e3 e3 M. ^2 j

; `3 D* K! {9 ?8 y8 T  ;; patch agentsets* G7 v- A5 {) w/ ^8 e7 t
  intersections ;; agentset containing the patches that are intersections8 h) Y) m# g; I! D8 T
  roads         ;; agentset containing the patches that are roads4 w7 G# I  D" o
]
' k8 R. S' C$ S6 ]9 y5 C# M, x
6 b  R* ]$ S# \( s8 @turtles-own0 {# v) e4 B7 L, D5 {
[
2 }3 p( I$ {% z' ]( f, U0 T  speed     ;; the speed of the turtle1 M1 y6 E6 ]: p: ?, ]
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
3 g% b2 y, o& e' T7 f* ~' x' z  wait-time ;; the amount of time since the last time a turtle has moved! m6 F% o5 t$ r; ]: E% {$ N
]
2 l# @& K& w5 {$ @( }+ k
/ {9 l* R  ^& Ppatches-own. X# \7 L0 l3 F6 P, W  D6 \
[
1 x! ~  E9 e* N" ]" F2 ~  intersection?   ;; true if the patch is at the intersection of two roads
; m% j' v- Z1 |5 X" A* Z  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
. B5 j$ O% N, Y; a. I                  ;; false for a non-intersection patches.
& Q% P: ^& @7 b7 `& S  my-row          ;; the row of the intersection counting from the upper left corner of the
. D. l# Q2 D1 s3 x$ B* k: q# b                  ;; world.  -1 for non-intersection patches.
# Z1 O; S. F8 K  my-column       ;; the column of the intersection counting from the upper left corner of the
" z8 `2 L! J1 g5 b+ w                  ;; world.  -1 for non-intersection patches.
, i/ S" ?- K' P/ T& L+ O  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.9 \8 Z  m" B1 l2 ^
  auto?           ;; whether or not this intersection will switch automatically.& a: e4 e$ e8 `* T
                  ;; false for non-intersection patches.+ f) v; g; z" J2 E5 F3 y
]" }# @' V$ J% @: [" f1 ^% E
" j5 t( L- J7 J+ k  M' [$ a- A% q7 H
; j8 J0 c/ ^9 @+ a' c# q3 s3 e
;;;;;;;;;;;;;;;;;;;;;;
) c4 e* W7 ^4 j0 i;; Setup Procedures ;;
3 ^5 l. ?1 G8 g. p( g" `9 m;;;;;;;;;;;;;;;;;;;;;;
, X! V/ H9 m- g1 N8 e$ T' ~4 ?  M$ z% f! @8 |' W" [
;; Initialize the display by giving the global and patch variables initial values." Z8 z6 M0 ]* O. i2 ]: p) d) I
;; Create num-cars of turtles if there are enough road patches for one turtle to+ @3 k0 E% A: u  O( v
;; be created per road patch. Set up the plots.3 g3 J; ~& p# J6 W9 H0 x& \' ~/ B0 k
to setup0 k7 x2 z, f  i5 W
  ca( i. O. M; T7 F8 s' l5 _4 Q9 x
  setup-globals- Y# b* e2 P) i6 Q

* o, Z7 l0 d( B( K  ;; First we ask the patches to draw themselves and set up a few variables# a$ Z( R5 K% A- S* V( g/ U! o# w
  setup-patches5 L% H4 [$ v0 e4 j1 T6 N. `
  make-current one-of intersections; A/ E8 R1 N" m: v
  label-current
$ _# `/ s# d2 o6 N% _. c% L1 Y( v* d' s
  set-default-shape turtles "car"
) ^4 h5 }1 C- W7 n; M/ ~5 v
5 S2 a  r# t( l  if (num-cars > count roads)
* p( Y% x+ m- o% p; \  [
: n& w' X; p- Z! A    user-message (word "There are too many cars for the amount of "
  F8 g4 A& Y# L! r                       "road.  Either increase the amount of roads "1 T4 E1 n  L& r# _4 W# ^: i0 \" k
                       "by increasing the GRID-SIZE-X or "
1 F( G: |: r2 @# G- p' j% x                       "GRID-SIZE-Y sliders, or decrease the "* }, r# ]$ q7 w8 e
                       "number of cars by lowering the NUMBER slider.\n"
/ C" P) C- V- B, F                       "The setup has stopped.")
0 L' v5 z5 |7 i# W5 `9 h7 s    stop
& F+ X- E" F: g1 ?  ]
% t4 B$ U& ~  F6 j# Q/ T- ^. ]! C' E7 H: n; v
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color8 M& i# P  B( C" [$ S
  crt num-cars
( k) E- }7 G% u# ?6 P  [# W& {- n4 V8 c. B5 r
    setup-cars
' `. a3 G% Y) O& I: T& h; ~    set-car-color
. w1 c$ Y. q8 h% `+ H4 m    record-data! O: q  U' h2 W6 w
  ]
" f) _: O# S" o5 P; W+ d* F6 n# ?. K* k5 W  V9 y6 \4 u" ]
  ;; give the turtles an initial speed
, r* q: \% E, q/ M) r  ask turtles [ set-car-speed ]3 c+ j, |2 C* x/ F8 G. B: b; g
% G! T( A+ D, X9 M- Y
  reset-ticks& E; {4 F( S& r3 s( `' W6 ^
end
" S9 h( Y9 I" ]- J$ Z+ Z8 H3 Q1 v6 E6 e- c4 Y
;; Initialize the global variables to appropriate values7 y0 M9 A5 g8 T5 K
to setup-globals
4 k3 V. S" P1 ?) T8 m2 W  set current-light nobody ;; just for now, since there are no lights yet5 u9 u5 v6 Q5 F/ U! I
  set phase 0* S( x: y' t; W* U* [4 b' o
  set num-cars-stopped 0* y5 b) W* o6 k* i" f+ N! I! E
  set grid-x-inc world-width / grid-size-x
: p' W& P0 ]% s6 G2 e  set grid-y-inc world-height / grid-size-y
" t$ T' V/ o, u; a8 ^8 B/ a7 h3 p$ g+ C! P2 n* x/ `
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
% z! [( a+ O5 v. _3 i8 J  set acceleration 0.099
  u+ L0 a4 d& S: ?% H" m9 ]3 Z4 wend
9 T5 w9 `; {' ]
( m: t. V- h+ X& _9 c) C;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
/ Q8 s. v$ f. }" Z* ?;; and initialize the traffic lights to one setting
- E4 c0 R9 k3 L1 W2 cto setup-patches% F. Q" _& o1 A, c
  ;; initialize the patch-owned variables and color the patches to a base-color" k  G+ p5 [0 J* }8 k
  ask patches
5 f* g& V7 t; r$ d5 [9 r, l  [+ H) |+ ?! C8 v0 c4 l
    set intersection? false
2 A. D0 s( T" b    set auto? false/ g" b2 {/ z1 ], W# W6 {
    set green-light-up? true9 Z% C0 R8 ^4 {0 r
    set my-row -14 U2 g$ u! F$ a- B4 p4 q: i( }
    set my-column -11 R1 E) C1 R" v" ?* y0 ^- m* @
    set my-phase -1
: r5 s9 d/ v+ e8 `: f  [    set pcolor brown + 3
5 Q$ g8 K9 n5 L: |1 o  ]& b4 a8 a; |6 m0 l

: H' [. X' |/ ^& e* [+ u5 Q& r  ;; initialize the global variables that hold patch agentsets
0 h1 E6 N) v4 v: `6 ?  set roads patches with0 k/ F; I! a1 [7 V
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 E# b9 e+ O$ M  y/ ~8 x
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 `+ d% q9 P) w, s- v  set intersections roads with: |$ l6 I+ P1 ~' W
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and1 @5 f" Z  L3 R; L) Z
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
  _1 l& J$ v7 f% F) k& `! b
% f+ u7 b: v3 ~5 q# L  ask roads [ set pcolor white ]+ D4 Y( p. W( M) Q2 j' A
    setup-intersections
) c  k3 }# ~+ ]3 {7 w/ Yend
% }2 u* c, l7 v; [$ j' o) x; w其中定义道路的句子,如下所示,是什么意思啊?* b3 N9 l  K8 u2 Q1 _' Q
set roads patches with
* {0 L8 L! v, z7 [    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# f$ ~$ [: ~: T# J) K    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 E9 O- p. H; t8 ^3 L( H1 T7 t7 `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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