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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。1 w9 [2 z) S& G, k* n( N
netlogo自带的social science--traffic grid这一例子当中,- t: r. m, l# X5 G
globals* I& o6 N- Q2 r9 ~2 q
[9 Q% a* S/ R4 T' M# R
  grid-x-inc               ;; the amount of patches in between two roads in the x direction3 l' s$ D: V$ \  D; A) W2 E5 M8 p
  grid-y-inc               ;; the amount of patches in between two roads in the y direction- c0 e, j8 e- s3 M! v
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if6 `7 m/ L  W3 _0 m  X1 b) {  p
                           ;; it is to accelerate or decelerate/ E7 {* w& \% [7 y
  phase                    ;; keeps track of the phase/ T% B2 O6 T9 P1 F3 a9 I
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
1 H1 J( N. F. @. G, X4 @  current-light            ;; the currently selected light8 e6 _8 z/ \- x& m# P

6 m4 h1 t' ], P3 e$ Q6 Q# M  ;; patch agentsets. v8 h9 e4 {4 ?2 V9 n
  intersections ;; agentset containing the patches that are intersections
/ m# Q' ?4 A; L2 E% m, X  roads         ;; agentset containing the patches that are roads
, ?) U6 |& I2 G) [$ D]
8 @! o  F2 u0 u- Y+ ~0 w" Y! a" z7 z' ?' O+ u& A' m0 X
turtles-own
% _; e& ?  ^( w4 V' {, D; x; g[
3 {) S3 F. j* ?- {$ D; |  speed     ;; the speed of the turtle& v- I2 [' ]7 M0 j' Q  r" v
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right+ K( x5 [  r5 n$ j
  wait-time ;; the amount of time since the last time a turtle has moved# z7 ?3 Q2 a! T0 z! u. F5 N
]
; M% [1 t3 _3 ~1 V- [/ p
# y& p$ L- i7 h7 j8 Epatches-own
# J, p& ~+ k6 Q0 M, \$ m0 U[
8 F" R: B% F3 r4 q! n1 Q  intersection?   ;; true if the patch is at the intersection of two roads
( {2 g/ e9 f3 J0 ^! H9 z  A  y! G- x  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.  U/ h" D. k" _8 z! T
                  ;; false for a non-intersection patches.4 Z, l% y7 y& U, e4 i; b2 ^. Q
  my-row          ;; the row of the intersection counting from the upper left corner of the
. o5 S: j7 F) y  e* a                  ;; world.  -1 for non-intersection patches.0 Z/ D2 r0 g; |
  my-column       ;; the column of the intersection counting from the upper left corner of the1 u0 Y6 P; [+ a/ }) z6 ^
                  ;; world.  -1 for non-intersection patches.
0 f- N4 O/ j8 ?% J) |  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.* I8 o  z3 s& R- E
  auto?           ;; whether or not this intersection will switch automatically.0 X. k! f1 a: r7 V0 V5 ]
                  ;; false for non-intersection patches.
( C* q. P2 p$ W6 C8 |$ G$ N7 c' \]
0 N' t8 l- X+ L7 L6 p
8 e8 l, p$ }- c! t) r& ~: \- {0 v6 C9 B( Z9 C' c7 `, C) r
;;;;;;;;;;;;;;;;;;;;;;
6 M+ h, ?- Z/ ]: ^! ^: ]  N;; Setup Procedures ;;- S! c8 A7 a; c( I9 f9 \
;;;;;;;;;;;;;;;;;;;;;;% `- F( _" a) N8 S& Q
! g" I( [* N6 G$ g2 q
;; Initialize the display by giving the global and patch variables initial values.- r" K' r# r0 i1 V
;; Create num-cars of turtles if there are enough road patches for one turtle to
9 E% T! c( g* o( Y;; be created per road patch. Set up the plots.
5 A/ W- C& X; H% G) `to setup( e0 `/ y7 S7 O- L) \
  ca; Q+ X* |2 R, Z0 ]/ [& e
  setup-globals4 F+ x8 V& N( Y' _
/ G6 L+ X1 ?0 V! Z- q, y
  ;; First we ask the patches to draw themselves and set up a few variables
0 O, h! m+ }3 a  setup-patches
; F# T, @; g9 C" E& t0 s8 p  make-current one-of intersections' N! V6 j% |# m! e& z
  label-current) f+ {. J0 D2 x! e5 c+ x8 D

5 n7 |( |2 d! J/ }& ^# @* X, H: D+ n  set-default-shape turtles "car"
0 y' H! m3 K2 K; s
+ M2 I" v  ?& ?! D0 h8 M  if (num-cars > count roads)) l3 @: B+ r9 e# Z* d; L9 X5 K
  [
4 Y" |* D+ T7 e3 n! C    user-message (word "There are too many cars for the amount of "" k* n6 Z; }! e# ?. N. a& y
                       "road.  Either increase the amount of roads "5 m" d7 ^7 ]) E( `1 x5 b" X3 e
                       "by increasing the GRID-SIZE-X or "0 Y6 W) d0 k; ^7 @
                       "GRID-SIZE-Y sliders, or decrease the "/ O* d4 N, y  j: g' _
                       "number of cars by lowering the NUMBER slider.\n"
  Q% e2 b9 R5 _                       "The setup has stopped.")
- r! c1 I2 k. w! r% M5 P" ~/ o    stop
+ P) G1 E* y! k  ]
7 T# h% `/ q8 _$ h
; z/ C' P$ p$ A- L- C( M6 D7 l! @  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
6 t  z. b) Q5 R5 f/ s  crt num-cars
0 u& H' l% Q2 |  [
" _2 C- V. i4 K3 z: ^! e    setup-cars
  @+ V3 S  z2 k2 f/ O, O    set-car-color! y2 _6 M, |0 J" ~- N; d* _) ^
    record-data: g/ I$ U; x+ m7 Z7 L: d
  ]: z0 K$ O1 U) T; U# V5 T
# T9 |1 `. y5 ^  a" u
  ;; give the turtles an initial speed' Z( B3 F2 Y0 q. N0 S
  ask turtles [ set-car-speed ]. Q) O( f* m1 n! U( S

" x6 }3 n. w. j" P: u  reset-ticks
( M# M7 x  f, g0 Vend" f3 O2 F# e9 N. N. n# ^+ u
7 ]2 f# v' l  I  S" I' z$ Y
;; Initialize the global variables to appropriate values/ }' }6 |5 m& j9 |( O% Q4 ~4 E/ m
to setup-globals1 O* U2 c' y+ @1 C% h, r) `
  set current-light nobody ;; just for now, since there are no lights yet/ t* u* z' }0 a- ]
  set phase 0# |) W4 ?& u* e+ d
  set num-cars-stopped 0: p" n" J6 `% E5 U' X# K/ k1 J+ R" ~1 z
  set grid-x-inc world-width / grid-size-x
5 A  x: e; J9 Z5 b6 Z3 T- I7 ?  set grid-y-inc world-height / grid-size-y6 \2 R! M: R6 V/ K

: L% J1 \* m$ Q8 q# G- t  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary8 s3 V0 R, j# {4 T- [
  set acceleration 0.099! X% j! t7 [0 l6 ^+ w' q, f4 @; z8 }
end- o, l, v" u9 `+ l5 D! ~
+ i) |, Q8 @5 k  T
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 q2 ^* A* s: p
;; and initialize the traffic lights to one setting: ?$ \* W2 Y' _; a, r9 B
to setup-patches) J/ G( }9 L  C( a1 {
  ;; initialize the patch-owned variables and color the patches to a base-color
. H. i: `6 _/ [+ _  ask patches6 I6 y5 A6 }  f; G% c
  [
1 M. m& C! `. q" N    set intersection? false
# y* N/ r* e  p( W    set auto? false8 a8 A( c7 \; d3 u& t; f8 i
    set green-light-up? true
1 F9 k/ i" L; o8 [3 U    set my-row -1" N4 o7 k( f5 \1 J
    set my-column -1
7 L9 e. P9 b# k$ r) N, v2 v    set my-phase -1
4 _1 B% ?9 `  E( D' b    set pcolor brown + 3+ ?% e& E3 c" g9 a# Q# d7 E
  ]8 M+ X7 M+ E) p6 v7 W2 Z

( w9 d" T4 V! v* h) ^5 y  ;; initialize the global variables that hold patch agentsets, z; F7 f2 o0 M4 F
  set roads patches with/ F; X1 }) c- h7 W
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; P" F! V- J: k' W0 b2 C
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 k$ E0 j; T: W7 ^; J. m8 a
  set intersections roads with
2 t5 E8 Y# G- |* O  D9 Y( X0 g+ d    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
2 K" q7 J) ^1 P1 h6 r% ?5 R    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 i& s+ Q& O! ]4 K! K7 H6 l: u' T

9 V0 {5 M8 T8 E$ _. i3 F  ask roads [ set pcolor white ]0 y0 B7 @. g2 f
    setup-intersections" T  [& `8 M7 Q+ Z
end
( q. ?& O- K' u5 i+ `' F( C其中定义道路的句子,如下所示,是什么意思啊?
! Z! F$ c* s" K! T# [ set roads patches with: ^2 |3 f- R' ]. I
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ S# f, W1 a/ v1 p0 p
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: P9 D: @2 M# a* M; w9 _2 A9 o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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