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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。
3 Z2 w' h9 Q9 z$ G; }! nnetlogo自带的social science--traffic grid这一例子当中,
6 k4 \' |) C; O8 V! z/ C+ r% Vglobals) r! w" [% S1 I" W2 `1 R  h( M; h
[
0 c, }* G, J& d+ ^1 F" k; M# }) G' D1 o  grid-x-inc               ;; the amount of patches in between two roads in the x direction
5 E9 o7 m2 J8 K9 f. I+ Y9 i  grid-y-inc               ;; the amount of patches in between two roads in the y direction
5 B2 j7 v0 b! R1 c3 X; G  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
) v. j$ a- B2 K7 c& L                           ;; it is to accelerate or decelerate
2 `% O. k9 S. a& }: ~  phase                    ;; keeps track of the phase: Z" Y1 z0 m* y7 Y, {3 a" j/ H4 {1 n, p7 p
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure& k, j# e1 ?# K; O/ i" V& ]
  current-light            ;; the currently selected light
* b1 k2 c! \$ L9 c1 o% |
5 [  k; B# C$ u3 J  ;; patch agentsets
" B' Z+ i3 ]; t, ~: K9 D; h4 V( ^: @  intersections ;; agentset containing the patches that are intersections
3 }2 ^9 ^. r/ Y0 D( |  roads         ;; agentset containing the patches that are roads: v& h2 Y8 T$ N; B6 v" B9 p% r  p
]
5 ~/ q0 n& B1 n$ F8 B/ e% j# u8 |9 N
7 i' d  i9 D/ i& f- |( C' K7 I6 |turtles-own
* G! d* l3 C5 f; j[1 l- H$ w' @9 Y) ]' d$ T$ c* A
  speed     ;; the speed of the turtle
% B2 p, _  @) m1 h  up-car?   ;; true if the turtle moves downwards and false if it moves to the right; ]/ @$ l% }# T
  wait-time ;; the amount of time since the last time a turtle has moved
, o1 m2 w# u6 k]  W0 e+ ^% u$ y/ r5 b

6 k* U+ ~/ |/ Y% a( `' Ppatches-own
5 \' w" f1 s, q; w- s[8 X. B9 N5 V+ k0 Q/ k' y% ?
  intersection?   ;; true if the patch is at the intersection of two roads! {  I* q* H5 t3 Q; s
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.; J/ C2 I: B! }8 @( |2 `4 f
                  ;; false for a non-intersection patches., O0 o, E* |; \. }' b
  my-row          ;; the row of the intersection counting from the upper left corner of the# O3 z3 m" j2 J3 N7 b, b
                  ;; world.  -1 for non-intersection patches.* N; k% l) V+ u( A3 v
  my-column       ;; the column of the intersection counting from the upper left corner of the6 e6 b: j# k6 k0 W# t# j8 i; X7 n
                  ;; world.  -1 for non-intersection patches.
1 A/ L0 f1 `$ }/ S$ n( N  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.9 a, H3 ~3 f2 j8 X" L1 L( k
  auto?           ;; whether or not this intersection will switch automatically.
7 R. i/ S, [0 b/ C7 O; N                  ;; false for non-intersection patches.$ F; S/ z" F! V6 n
]6 _' d! w0 d+ b$ f' }" y# C
7 M' j0 A* K# w# R+ b+ o
; w- O0 u" X& w
;;;;;;;;;;;;;;;;;;;;;;' h3 z* l5 U0 `* t
;; Setup Procedures ;;% H; j6 e  O. q& T! Y
;;;;;;;;;;;;;;;;;;;;;;
. G4 _9 N/ q/ `6 ^$ @
3 F2 S6 S% s5 p$ r2 h. Z;; Initialize the display by giving the global and patch variables initial values.
$ C5 G8 m% n. ~6 N$ L, M$ F: |;; Create num-cars of turtles if there are enough road patches for one turtle to
9 v$ E/ }- ~5 \* Z* j, k;; be created per road patch. Set up the plots.. o) f* [" O# w9 t5 F: N. `0 y
to setup# L4 f$ v! V" A4 A" w1 s! S) l$ H0 z: x
  ca
" M9 u- X! c6 N0 e# g  setup-globals9 S, ?* u8 S8 A; W

# V( w. p- o; n  ;; First we ask the patches to draw themselves and set up a few variables
4 I  W" I, ?  B$ I8 M  setup-patches- `  o& O- V# w
  make-current one-of intersections% Q' [6 S" |8 W
  label-current7 T) x% u# n/ r+ _2 Q( O" H
) }/ u. z2 B" X* J$ \/ Z- p. @& C
  set-default-shape turtles "car"
& z' m  u( A) O* b" n
3 A/ s! F8 M' V) O: k9 e, L  if (num-cars > count roads)
0 q' v* B8 h7 r; {2 o1 Y1 a& y  [
' x* H9 c/ w& ?: |' G6 F    user-message (word "There are too many cars for the amount of "
* o7 n& w( c5 {4 n                       "road.  Either increase the amount of roads "
2 Y0 _( I0 W' ^0 }                       "by increasing the GRID-SIZE-X or "
8 V5 C! T" R' w( f$ {                       "GRID-SIZE-Y sliders, or decrease the "
& d; j: n; M$ k, C6 Y: Q: d                       "number of cars by lowering the NUMBER slider.\n"" \  I% d# z8 O0 c2 H% Z
                       "The setup has stopped.")  X& ?/ K; \) n( ]4 `* Q# n4 Y
    stop
5 t) |9 x1 V* B4 h8 |/ K+ K  ]
' b; q3 W+ i6 D% N& r
+ I* R! x9 a9 {, q7 c  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
7 y$ I- f4 B9 Y$ m$ }  crt num-cars
) Z- X( x- [8 u; ~/ c5 y  [
6 t, s: Z7 |: `  V6 X( o    setup-cars
. K( p# ]( ?$ x- |* t& G' t9 N    set-car-color- \3 Z7 @! O. O6 Y
    record-data
. [' P: S6 b8 h- m' o  ]
& l6 O; F" Y& G
5 l' C$ u! s9 I% k- @  {  ;; give the turtles an initial speed
9 n; g5 r( @  X# u$ Q0 ~  ask turtles [ set-car-speed ]& o7 |" y# A6 b$ q% ~7 {% Z

6 M8 Z1 S' R0 h$ C, p0 b! Z1 n4 I6 t  reset-ticks0 L+ j" s/ H3 @4 P
end" P3 ?7 c$ c& t$ D- `6 K
" {9 D5 e8 l! ]8 W8 L0 b: T3 c
;; Initialize the global variables to appropriate values
6 G$ E5 J, ^0 V1 {8 Hto setup-globals
9 n2 z, n3 |4 u: W7 V  set current-light nobody ;; just for now, since there are no lights yet
! J; M, ?, i$ J6 o; q8 ~  set phase 0
1 w; P6 |) m- @( ~* ^% M6 @2 B  set num-cars-stopped 0
) E- ^$ U+ U, S- Z  s" c  set grid-x-inc world-width / grid-size-x, K& \& f; o7 i- x7 \7 V4 Q" y, H
  set grid-y-inc world-height / grid-size-y
$ |% Y) R3 ]6 w4 s; Y
+ K! @( c: U* d, n% \  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
" h+ A& k1 p9 |6 Y4 ?: V+ s  set acceleration 0.0994 X$ W4 s  B% T% R* E
end7 N" u! X, w1 ]/ `, V. S
( J5 V! s0 A! o/ Q! y+ H9 U, L
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
( x2 s5 z. z" };; and initialize the traffic lights to one setting
& \! @7 g4 W5 }; ~" \to setup-patches
2 X! ^0 `. r. h/ M  ;; initialize the patch-owned variables and color the patches to a base-color' t  y6 a/ z5 c+ Q" @8 Q
  ask patches
+ ~2 l- m1 i3 @  [/ S: L' T/ c7 g; A5 I% W' ^
    set intersection? false6 ~# n% R0 M! a1 v
    set auto? false
" y0 e3 W" a9 O- v, a    set green-light-up? true
, J# M; w% Q! q    set my-row -1
1 m9 ?0 R/ Z% G8 q0 T    set my-column -19 W/ F9 S. D6 w  f0 V1 m  @5 f6 H9 m
    set my-phase -1
# v) ~5 p( G' L, m- t- x/ s    set pcolor brown + 3
$ a. ]' n/ T3 Q9 g  ]
8 y* r0 T4 ?# F( g
- C% q- O7 N9 L- R( s. {) \0 W; h: M) _  ;; initialize the global variables that hold patch agentsets' T) Z$ F6 f6 O4 s
  set roads patches with
1 t, _+ L/ J9 G. m6 H- l    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# c3 A: c  M9 s$ A
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 E- K* ?! W6 l7 ~
  set intersections roads with
# _. L5 ?9 [/ @    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and+ Z6 i: e1 z- I+ z9 @- r( n
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ I) [; E% A! C$ U$ o; F( s
* r: L- h8 T' M  ask roads [ set pcolor white ]
* o$ h5 h; B: @! V- c3 }    setup-intersections* O; L7 \1 n& o: [' f! U5 B7 a
end
; G+ L3 a+ |7 o) e% r& l( L* w" N其中定义道路的句子,如下所示,是什么意思啊?7 U  H0 j  c! V' u( W+ C8 T( q1 I
set roads patches with
  S. ]3 R8 l+ t& P! {% {" M- E    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* k/ H8 ~  _! \; R% |    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 M, A' w. ]4 w) \) m" D8 K
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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