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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。
( h* C( G' C/ f1 k' T3 Y( Xnetlogo自带的social science--traffic grid这一例子当中,2 ~& ]) a8 h8 D2 g2 ]5 k8 e
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
) E, Z8 l7 L, K7 c+ M grid-y-inc ;; the amount of patches in between two roads in the y direction* t0 U. ]. J- s% D
acceleration ;; the constant that controls how much a car speeds up or slows down by if
6 [# `: G$ G2 V ;; it is to accelerate or decelerate) i- `2 ^7 r. d1 Y, y3 H# i( @* B
phase ;; keeps track of the phase
7 R1 _2 r. g5 Z num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure( m! D2 ^; K4 k L S
current-light ;; the currently selected light% G4 t8 A2 u9 H, W3 K
, F" P0 o% {9 D ;; patch agentsets
' T. w- l4 R9 x6 q8 t9 ` intersections ;; agentset containing the patches that are intersections' H. v$ Q" ~/ O( t3 a0 c
roads ;; agentset containing the patches that are roads/ |5 l1 A d) Y6 \
]% K' `# r+ s; v
9 w0 ]2 A R" Y% V' {turtles-own* L# k+ m9 R9 [0 A2 y
[3 a5 R7 ^% v% [5 F$ K
speed ;; the speed of the turtle
3 D) J- q6 E9 @9 u# O p. l up-car? ;; true if the turtle moves downwards and false if it moves to the right+ G4 u% j! O. g/ q
wait-time ;; the amount of time since the last time a turtle has moved
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s: n9 g2 v5 X8 }patches-own0 j3 {2 I8 d& ~) [) a
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intersection? ;; true if the patch is at the intersection of two roads
! H% g; C2 d9 f" S green-light-up? ;; true if the green light is above the intersection. otherwise, false.' O* ]3 L* j0 o5 x7 E
;; false for a non-intersection patches.
3 D0 H3 p* U" q( h my-row ;; the row of the intersection counting from the upper left corner of the
4 S( x0 I) m- i* i( K" x4 C, U9 f( L2 P ;; world. -1 for non-intersection patches.
/ w3 q R$ ?5 m/ ]& N1 n) m) ? my-column ;; the column of the intersection counting from the upper left corner of the
+ M$ b! n# X6 M8 }/ P4 l9 ?! M ;; world. -1 for non-intersection patches.6 L( f7 D/ c1 D# {1 n
my-phase ;; the phase for the intersection. -1 for non-intersection patches.9 s. t/ ?: j! U* _( R/ p
auto? ;; whether or not this intersection will switch automatically.! T/ W: G$ L3 y) z
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;+ B, O% S) |4 O& o
;; Setup Procedures ;;
! q8 R* [' R" R$ c, V;;;;;;;;;;;;;;;;;;;;;;2 _; B5 f, Q* G3 _/ m& W4 S0 x! g& v
: h$ Q) \& q/ J3 T: [;; Initialize the display by giving the global and patch variables initial values.
& Y4 I3 @! O" q;; Create num-cars of turtles if there are enough road patches for one turtle to
. ^( ~4 u, ^2 z6 r;; be created per road patch. Set up the plots.* ]$ Q! V# I: ?: G0 }: I8 X
to setup% g7 T7 L. F4 a5 i5 O
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setup-globals7 ^% w% H3 p3 b k$ ?
+ n2 X! y/ b8 p2 M4 I2 q ;; First we ask the patches to draw themselves and set up a few variables
8 N$ g, F- J6 B setup-patches
, g* |. v2 x4 C- ~8 t ^8 j/ p/ i make-current one-of intersections
7 {$ ~1 Y9 Q3 R7 j8 E6 u label-current9 E4 h* m' W! `2 u
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set-default-shape turtles "car"
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& c' H3 C% Y* K# ] F1 j if (num-cars > count roads)9 I' e% v5 l7 X; F% b" ` M
[
8 i# \/ W; x0 O- G user-message (word "There are too many cars for the amount of "
! _1 k1 p5 r/ B/ X Y9 f! N "road. Either increase the amount of roads "' u6 ^+ a" ^! r! F# W2 R' j$ b
"by increasing the GRID-SIZE-X or "" F5 x' P& h* }' V
"GRID-SIZE-Y sliders, or decrease the " b. k' u% T4 w- _' M) f7 [5 Y0 Y
"number of cars by lowering the NUMBER slider.\n"( C4 ]% J2 i9 j* C' G% p/ Y3 h# V
"The setup has stopped.")
" L: M; y+ I' f stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color2 T' c/ {8 o( o& W
crt num-cars2 b. K1 W' X% K# N9 s
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setup-cars
2 y3 n4 l: C. n% E9 ~3 z* q set-car-color8 b4 r4 a& X5 x& f5 b
record-data- \3 `0 y* p: O4 A) ~! n
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# f0 j0 A; A* e0 q5 K" `, ] ;; give the turtles an initial speed
% V+ m1 e. U7 m. n ask turtles [ set-car-speed ]
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# a, t# k/ k* O, C# f reset-ticks% U! N$ W) _, C: q; A' X
end& W& k, b5 u! {7 Q4 m( o1 H
/ V& Z$ k" s# P4 Z9 A& g;; Initialize the global variables to appropriate values+ @' y' y% M2 q& K4 [
to setup-globals0 L" g# {+ B$ s" C7 f
set current-light nobody ;; just for now, since there are no lights yet
1 ~2 N! C/ t5 H set phase 0! H3 ^8 J% ^, o2 n( A4 a
set num-cars-stopped 0& W- r# J+ J8 o
set grid-x-inc world-width / grid-size-x" y6 M+ _* Y" N% E
set grid-y-inc world-height / grid-size-y1 ?* H, S6 ^, @# C
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
* _7 Y. `! @! t( \ set acceleration 0.099
, B2 L& c2 F& l7 Oend
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# ]* ^* F' g$ x7 N2 q;; Make the patches have appropriate colors, set up the roads and intersections agentsets,* n+ o9 K# `: z/ |, T) [0 {, j
;; and initialize the traffic lights to one setting
. q5 H5 C9 i, i3 Dto setup-patches
) _3 s. U8 o/ H! K/ z# O ;; initialize the patch-owned variables and color the patches to a base-color
P6 {) Q+ n4 O6 N0 m ask patches
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+ F8 |" |; r i' Y6 Y& H% ] set intersection? false5 Q. B7 Y. i- U$ H7 s
set auto? false
+ Q4 r M% \) V3 h* o/ n set green-light-up? true
9 R* Q. y7 _/ j5 z set my-row -1
7 Z+ }3 T6 q: z2 h set my-column -1, |0 ?8 o1 l) e+ Y; n
set my-phase -1
& B& h2 I$ h8 n set pcolor brown + 36 u: `% d7 r/ W. ~& x; O
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J7 W* m' f2 V8 v) U/ E ;; initialize the global variables that hold patch agentsets7 z( j. r3 m# L1 n: P
set roads patches with
& J' V* {! U$ S: `/ i0 _ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 o! S% t0 ` i2 s1 x, D8 [- D# ?0 g
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 v- x5 u: u# n4 I# R/ I# t
set intersections roads with: B/ M: y" A- [
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and& H1 G- J9 P8 D+ K8 [$ k
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]- b2 E5 s: ~6 j
7 p! _* V4 I4 R! @" d ask roads [ set pcolor white ]
t: Q- t* r9 R+ A% o setup-intersections5 f+ k! C+ P D% C" A. G: {& Z
end
8 a# l. `5 e8 J5 Q其中定义道路的句子,如下所示,是什么意思啊?
# o& s8 m3 m! s set roads patches with: Z' D1 F3 R% Q, S/ ]& F; j
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' o/ a# |" |4 D' @, H) t. @0 U
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 k9 E7 i: t5 L: c# t" I
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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