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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 H2 i! ~! T5 b+ Y" vnetlogo自带的social science--traffic grid这一例子当中,9 n+ M9 G: C! B6 A5 L" |
globals
0 I8 `0 {: ]/ J- V4 h$ p[0 E6 f. {6 z, l" V9 u  x" L5 H
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
0 I, Q  Y9 |3 ~! t  y  grid-y-inc               ;; the amount of patches in between two roads in the y direction8 T0 t4 ~: H+ H# i7 B- l
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if" i2 `; Q, g- l) J
                           ;; it is to accelerate or decelerate% N- ?4 F0 C! O) @2 @
  phase                    ;; keeps track of the phase
6 V: u% j4 L7 }6 u  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
2 r0 {; Y2 |7 |+ G  current-light            ;; the currently selected light
3 K- h; [. u7 `% n
  B. e, @9 a/ J. R' p  ;; patch agentsets
2 ]. i) ?% _$ G" m0 @) }% K  intersections ;; agentset containing the patches that are intersections
4 b9 P% j1 Y* I+ ?6 m$ m  roads         ;; agentset containing the patches that are roads
/ ^' o+ M$ |2 k9 h  V: n0 T" y' n]
! N- U" J# V6 z" x2 M+ Y; J% ]. b+ a
turtles-own; h8 s% h' z* \, q0 X* z# m2 T% T
[$ ]6 b+ l6 u+ ?  C; G1 E2 Q+ G
  speed     ;; the speed of the turtle) x* [  o2 L& e5 J* ?5 k
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right: i/ u$ o1 d8 c" N1 x
  wait-time ;; the amount of time since the last time a turtle has moved& G2 T: U# O; B+ V( A& u
]
9 n& o$ N  H# d& ]7 B! [7 f! a2 H$ r0 l; m0 v
patches-own
) n- |4 H  Z9 J# l( y+ {[* o: C  B  Z5 Y
  intersection?   ;; true if the patch is at the intersection of two roads
' f% ]  `  R$ w" L  green-light-up? ;; true if the green light is above the intersection.  otherwise, false./ Q# C* A0 g+ R; m( ]
                  ;; false for a non-intersection patches.
* Z8 q+ M# i$ Y: m3 b5 N7 U  my-row          ;; the row of the intersection counting from the upper left corner of the
; ]# N! m5 I! ^' W5 T                  ;; world.  -1 for non-intersection patches.2 r4 }. Z* [2 }7 @
  my-column       ;; the column of the intersection counting from the upper left corner of the. x7 o1 h+ M) ~( E0 C
                  ;; world.  -1 for non-intersection patches.+ o0 y: p- m9 G$ r% E( ?% {! L
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.# y$ @" A) @7 ]$ O) P
  auto?           ;; whether or not this intersection will switch automatically.
' i* n* A3 {0 ~6 c                  ;; false for non-intersection patches.4 i$ o0 E' [# p0 e. b( d
]8 A4 h, x( U& i; k

& h* H0 L# P0 h+ t- a( D
/ C6 b/ L) ]' N+ O3 G9 }* b;;;;;;;;;;;;;;;;;;;;;;9 C. P* v1 H6 y  `: M7 C; z
;; Setup Procedures ;;
( L; C5 `! u& P9 b- L' U;;;;;;;;;;;;;;;;;;;;;;: a" C0 ~( q2 g, j" L# i

- f6 h  S' c7 z$ n0 m! U;; Initialize the display by giving the global and patch variables initial values.
6 S& E2 J3 Q% g0 f( i; V; s;; Create num-cars of turtles if there are enough road patches for one turtle to
( X, E% y/ v, a6 u: K;; be created per road patch. Set up the plots.
. D1 b; J( {8 yto setup
+ `1 j0 w2 w8 _: H  ca3 L3 G% o: B; V. t
  setup-globals5 N) O  F0 W: o+ w0 a4 \
- o5 x! {, c( q/ F
  ;; First we ask the patches to draw themselves and set up a few variables
/ s9 r0 |' H& K9 e  setup-patches
3 |* j8 W1 p& K- L7 W  make-current one-of intersections
& o, {0 J0 F4 E3 B8 R0 O  label-current) ^/ a8 r3 _1 N; X+ p

  l6 y4 [  A; z' F  set-default-shape turtles "car"
: n: M6 I5 D3 b6 k
, V7 E. W4 l; i/ t+ V' n  if (num-cars > count roads)" k% {6 g1 ~7 D
  [
: A; y# E# T$ v  l. @    user-message (word "There are too many cars for the amount of "
) r5 f" S" t1 g8 o$ x                       "road.  Either increase the amount of roads "
( K/ Y7 i. @8 g                       "by increasing the GRID-SIZE-X or "3 L$ ~0 Y: I8 _9 N6 q0 t2 X7 B8 D
                       "GRID-SIZE-Y sliders, or decrease the "
( O4 X; l! R/ t4 D! p/ k- X, Y                       "number of cars by lowering the NUMBER slider.\n": D6 d& I9 g2 P4 N7 M* t. r. c
                       "The setup has stopped.")/ p7 _% |0 f3 x7 X7 u/ k9 p
    stop
  \+ u" x1 z8 [  ]) F' U: J; l7 K8 F

! a$ f/ B' A) }/ Q9 B* E1 t  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color0 }( `. g2 U. |
  crt num-cars" D9 t+ }* o7 k, x4 V/ K8 c
  [. L, P/ h1 H7 Y+ }7 ?
    setup-cars" r2 R& V4 s% t% y, e) p) s
    set-car-color
5 ?! z# {+ N: Y    record-data) L7 r! [8 [, i4 z- f* e2 T
  ]
! w! ?% N- Z4 f; V. O; u" i, @- `# Y& r
  ;; give the turtles an initial speed% P3 `/ K+ q! J' C% z* Y
  ask turtles [ set-car-speed ]& T% f, k0 ~" R4 F0 j2 k, N
5 r' Y  P3 A" l, v7 g% C1 B7 ^
  reset-ticks% H7 f( H, F: r. L8 T! R
end
5 |& _6 U6 f/ a  ~2 B6 o2 V9 y
- Z! G0 R+ h4 |" B6 j7 d, `5 C;; Initialize the global variables to appropriate values
8 j$ p- B( H" P# I8 ?to setup-globals9 g4 G4 d5 |( A# P8 F& G# ?2 O
  set current-light nobody ;; just for now, since there are no lights yet
; w5 K: h0 J+ C+ f( a; s" d# P# N/ o; Q  set phase 0
8 I; K+ S5 B+ [) l  set num-cars-stopped 0
6 ^! Y/ q4 c/ c1 v2 V. w1 z1 M+ O6 i  set grid-x-inc world-width / grid-size-x
  q- c/ t$ ~. L! [  set grid-y-inc world-height / grid-size-y& R3 E' l8 d" t% Y* k! m

" o+ i5 d" s& B2 b  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! y; ]8 S( r( C- [, a  set acceleration 0.099
8 m* Y% P; I% x" m  s& \+ T( iend
# J8 i+ m6 L$ {
' v( r! Z8 h( `5 W5 _1 Y$ V2 V;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
1 _% e, Q+ ]- ~0 E8 r2 W/ G8 M;; and initialize the traffic lights to one setting* F8 T. Z0 ?0 `( m" a
to setup-patches( {# i9 X. o; x) v
  ;; initialize the patch-owned variables and color the patches to a base-color/ N* [$ }: d1 E! @2 E) {
  ask patches3 D; e; \+ i+ U  R& `4 A& S
  [
( N+ L: ^5 L6 e" U9 a) {    set intersection? false, X: y& G4 r9 V" _- N
    set auto? false
. j* y9 g; H; Y2 A7 X* r    set green-light-up? true9 c3 a  f, J9 I  T& z2 n9 j
    set my-row -1* i( M  [* K& D1 W% I' Y- `
    set my-column -1
9 @% M6 R) A. w; i    set my-phase -1
# y/ Q% [2 }" H* A, b    set pcolor brown + 3# r' {) A& h" l; I: U" Z' w
  ]0 _( f- S$ |* S

' J& h0 @* l5 d  L4 e$ y' {4 H  ;; initialize the global variables that hold patch agentsets# A* Q& F% D# A( f- e" E& w6 g0 ~
  set roads patches with* D! u" d/ c+ {% U- H
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 Y9 {" \% [7 y* [
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 S! l# C- O2 e# G  set intersections roads with
; ^% f. w! b, ]1 Y2 F' E    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and* X; D3 ^9 r# N
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# g- E* ^) G! {4 N2 N* T
3 i7 {% j7 P3 y: l- P  ask roads [ set pcolor white ]
1 Q/ v5 C+ ^1 B, N+ `: W4 `    setup-intersections% n, V  J3 n, `
end! j8 v/ `$ Y- b! Y
其中定义道路的句子,如下所示,是什么意思啊?$ z. z9 s7 N+ g& T- v4 a
set roads patches with8 k  q7 G  N  S6 C( c  a
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. j) s$ W* R9 H% _* K- W
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. z* R5 r' q3 b4 w: f6 ~
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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