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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。: \6 y- `8 C- @- j4 E' @9 k
netlogo自带的social science--traffic grid这一例子当中,
' w9 _( j: x$ [; _; D5 ]1 oglobals
& j" L8 g5 N! ~, c" A4 g[% j6 c8 |  E9 c; [
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
7 J3 t7 ]$ q( r  grid-y-inc               ;; the amount of patches in between two roads in the y direction
1 A' {8 Y6 d7 o, b( {  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
7 L" v7 r4 o% g" F, X. _2 `                           ;; it is to accelerate or decelerate1 s( b; m2 i3 q1 s- ~8 {
  phase                    ;; keeps track of the phase% L: m& J* ]- [  Y4 J! o
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
$ J* {2 l" Q  f) r6 z6 p% T  current-light            ;; the currently selected light+ I/ u5 _9 k. U' u$ \
( K8 @2 H! `) ]
  ;; patch agentsets) w7 K3 N  {1 P) x4 X# R
  intersections ;; agentset containing the patches that are intersections0 A# ?3 y" _$ z$ c3 W
  roads         ;; agentset containing the patches that are roads
7 g& m$ G/ _0 ~) h]
9 a0 M5 C8 u: e3 N/ b0 q+ K$ b/ k4 z8 v6 C) S
turtles-own. y% p6 R1 w1 K" |1 E
[
5 ]/ u9 Q( E6 d$ v% W+ t+ T  speed     ;; the speed of the turtle) h6 _- m+ g$ T: X: v/ k+ h( z! ]3 C
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right" V5 w9 y* A. m1 T- z
  wait-time ;; the amount of time since the last time a turtle has moved- S  t5 H! Y1 z
]
  ~! N. |0 ^. X$ j2 K+ h
% L/ M+ {, m0 [2 hpatches-own
, ~5 N- Z5 _; M' q1 ^' c; n[& e; ?: m/ G* i5 N) F4 H$ _3 o
  intersection?   ;; true if the patch is at the intersection of two roads
0 ~8 {% \- p; U8 ~4 F) e' A  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.9 y. E9 K$ L2 O, O1 t- I: Z
                  ;; false for a non-intersection patches.0 f+ {8 q3 ^4 b% O1 a
  my-row          ;; the row of the intersection counting from the upper left corner of the
! K/ V7 N. O: [+ w/ @; ^                  ;; world.  -1 for non-intersection patches.2 d. J% H# c( k$ k
  my-column       ;; the column of the intersection counting from the upper left corner of the4 d5 S" W- H  {$ o
                  ;; world.  -1 for non-intersection patches.
( K+ s3 ^4 o1 g0 H( |4 M  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
7 L. B3 B+ E# K, a  auto?           ;; whether or not this intersection will switch automatically.
5 k4 B1 a& i# v, I                  ;; false for non-intersection patches.9 L/ ^5 J: D: m+ n8 I8 W
]8 H* @8 l4 U9 F- v
9 h; v0 f& W) r, t

- X0 A& S7 M9 C- ~2 g- I;;;;;;;;;;;;;;;;;;;;;;  U$ A' r' t4 g; v" Z' m
;; Setup Procedures ;;
' C) K. x9 m: v0 k;;;;;;;;;;;;;;;;;;;;;;
3 u( |+ U; y( f+ q& W! S5 Z4 }
! B" ~0 |3 J/ x# G5 O* _;; Initialize the display by giving the global and patch variables initial values.: m  L% Q9 A% l& I2 h3 u( f4 {0 Q
;; Create num-cars of turtles if there are enough road patches for one turtle to2 T& Q( S& [! O
;; be created per road patch. Set up the plots.
! _# m7 a& Y4 v0 _( zto setup  r; w0 j5 V4 u* X
  ca! p# q; F  E$ z! p
  setup-globals+ ^! [, ^. E, [" R

3 t, s* Y( ?" @" y0 y  ;; First we ask the patches to draw themselves and set up a few variables, O7 [4 N" P6 _- H5 v
  setup-patches, d/ Y! |3 P/ [- s
  make-current one-of intersections% w: p4 }# ]/ T
  label-current" Y5 `' E, ]; W9 p3 ?1 N: f9 Z

: m" h" D1 {3 p) T% k6 N  set-default-shape turtles "car"7 e& e' L8 |8 t2 r- y" v# u
/ d% U3 o" |$ M0 K! i
  if (num-cars > count roads)% _/ F. G; ^/ X/ C- t& {
  [
! ?' o! G; [) q    user-message (word "There are too many cars for the amount of "/ g  b* H& D1 @% l0 f! X* ?" [# X
                       "road.  Either increase the amount of roads "7 {& p  ?! X, X+ f' _/ Z2 u
                       "by increasing the GRID-SIZE-X or "
( I% m: D! I; i3 F$ N9 d  e9 h$ [                       "GRID-SIZE-Y sliders, or decrease the "
+ ^4 h" a+ d2 }: A                       "number of cars by lowering the NUMBER slider.\n"
$ u- @; p; C+ |9 [( s                       "The setup has stopped.")% g0 \& k/ k- n* ^$ j# |5 a
    stop3 k5 x. X; e* i+ w
  ]; i+ k# Y9 b4 j  H! a( w" T

, P4 q- U# N: @  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color3 x" x* E1 N1 \# Z" |4 G2 g; T3 u1 G
  crt num-cars
9 C3 D* i3 ~; L: @  M, o3 R  [. @* u) q( j5 l) g$ i6 r" I
    setup-cars
5 Y4 ~- [2 y; v& P+ ?! _    set-car-color' g  l( \$ _6 _. H& j9 K, m
    record-data5 a, O1 E/ i8 ^# Z
  ]
1 N8 W7 r, S& J8 r! t
2 L5 w/ `# g) [  ;; give the turtles an initial speed
3 z. g0 x/ [& B  ask turtles [ set-car-speed ]/ }3 }4 j9 J1 _6 O# V0 T' N
. }5 G. Y, ]  j! c1 M
  reset-ticks  w+ M# Z: k- [) c
end
- i* E" W7 z& `% c/ b5 E: R$ [8 i
0 Z6 C3 B: `. S;; Initialize the global variables to appropriate values# }( N: q- R0 e8 r- t, q* n" C
to setup-globals7 m: a2 w; ~8 K7 H! ^
  set current-light nobody ;; just for now, since there are no lights yet3 {) w* c9 ?4 L6 O) Z6 i$ G
  set phase 0
# {1 x: \9 E0 J, ]+ t) q6 M! Z  set num-cars-stopped 00 i) A0 W: P7 `( R2 {
  set grid-x-inc world-width / grid-size-x
5 w0 ~* x  r* u  set grid-y-inc world-height / grid-size-y
. E* {# N1 l! C4 S0 e  H' Q& N1 T  u5 u" U
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
. \6 R! v; n) h% W. Z" W  set acceleration 0.099
% s8 d! l, J2 K( ?end
( R" O" Y* X  c2 z, Z  \  E
9 \3 V: N6 C* B8 o;; Make the patches have appropriate colors, set up the roads and intersections agentsets,& T. e+ ^- O, E1 |! L  q
;; and initialize the traffic lights to one setting
# L' R/ G1 ?4 Q4 t; p. Mto setup-patches1 ]9 _7 w3 y; S  B9 F( Q6 o& Q
  ;; initialize the patch-owned variables and color the patches to a base-color
3 o1 `# @& ^# ^; H' G, `  ask patches/ P" l4 N" I4 ]: O5 ~" e, K
  [4 A+ K  K  H3 Q' u) P% _- n
    set intersection? false6 `: B6 B% ^3 Q& K0 c9 T
    set auto? false6 g1 W4 A/ l, j) r, C& v
    set green-light-up? true9 @5 ~  h9 N/ C0 _
    set my-row -1
; R+ ^; Y) a+ m* L    set my-column -1* r0 G9 y! e; i
    set my-phase -1
; p. Y* `! O* x- D9 |    set pcolor brown + 3
1 X4 S& h  [2 A5 Y" a: P7 {2 a# W  ]
! p/ K! b. Y5 t: G% j& }5 Z
" `3 x* a( X4 O6 e$ P6 I  ;; initialize the global variables that hold patch agentsets$ I, d3 w9 s8 }& u6 c( }
  set roads patches with
# K+ }+ z% c4 Q) P7 ^1 N' U    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ l4 u- p4 t( b  j4 \* i' X" M! I2 j    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 ?- K. O' O0 C( ]8 |1 Z# n
  set intersections roads with
/ h% k% h( o9 x& z4 a6 `- m- h    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
- R0 N6 @6 u) ~2 @8 T    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) ~8 d1 M% w8 ]2 d8 {2 e' K/ _+ h) l' Z
  ask roads [ set pcolor white ]
/ e) P+ N' E  o; U% ?- @* x' w    setup-intersections
+ y$ N$ H% J" l, p+ Zend
' e% M* m) {! g2 E7 j其中定义道路的句子,如下所示,是什么意思啊?2 d+ n2 @; O1 C8 E/ i
set roads patches with& z8 \  ?1 P+ e' p. v
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ I& s0 ~" s; |0 T    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& [+ L0 v" z$ T9 B$ s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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