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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。
`: B/ E T" m+ L/ @netlogo自带的social science--traffic grid这一例子当中,
% J9 n, \; @3 M3 b1 Z" _globals
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n/ J5 A/ a3 m( O! C3 U+ k grid-x-inc ;; the amount of patches in between two roads in the x direction! u$ l9 o) Y9 B. q, F# l: [
grid-y-inc ;; the amount of patches in between two roads in the y direction5 |3 A0 Y8 O, k, {9 j7 Z. ]
acceleration ;; the constant that controls how much a car speeds up or slows down by if
n5 e1 l2 I" V1 t/ _! t8 u% S ;; it is to accelerate or decelerate: A$ ?9 D. _, u: L a f
phase ;; keeps track of the phase
% k5 L5 S. a& c2 p num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure7 ?; u1 V" ]) m1 z2 ?: r
current-light ;; the currently selected light+ q7 T( {( K; C( F3 q9 U. E
7 l1 L: v6 K9 S! X* n6 A ;; patch agentsets$ m+ m: Q0 h+ G( E6 W9 l
intersections ;; agentset containing the patches that are intersections
* {, u& T% m V4 R p( M5 S roads ;; agentset containing the patches that are roads# e: Q/ l! S1 v. ?% ?7 L5 q8 M3 \
]$ l. L! P5 @9 B% }
9 T* J7 L3 j0 A4 ^; rturtles-own
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speed ;; the speed of the turtle7 n8 u! H) d/ n% N/ B
up-car? ;; true if the turtle moves downwards and false if it moves to the right. _) m9 p e' U) i8 Y9 B8 f5 f) M
wait-time ;; the amount of time since the last time a turtle has moved6 }1 ^0 U/ ]* V B, M" C
]
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' B0 [" b7 [: p) M; ?/ q$ Upatches-own/ ~) w. L! M3 t' z7 b
[
# ~/ ~& ]: |4 v; F; `( f2 h& ^ intersection? ;; true if the patch is at the intersection of two roads
! m6 S" M3 H/ m, s( c5 P: X0 R% z green-light-up? ;; true if the green light is above the intersection. otherwise, false.
) P7 Y) c- [8 R8 j( x C ;; false for a non-intersection patches.
- U( T. ~* M) w5 ^- D. U" R my-row ;; the row of the intersection counting from the upper left corner of the
+ ]% Q& X' r" h ;; world. -1 for non-intersection patches.
) D8 z0 M% N7 M my-column ;; the column of the intersection counting from the upper left corner of the3 }/ W3 X' ?$ I. u6 C
;; world. -1 for non-intersection patches.
4 o) Q/ a6 j1 V8 _; v my-phase ;; the phase for the intersection. -1 for non-intersection patches.
, e! L! u1 U- X3 O8 z6 j7 K auto? ;; whether or not this intersection will switch automatically.+ K8 e/ q+ h& F X& m. m6 G
;; false for non-intersection patches.# O& V8 k0 R7 z9 Y+ z& D( I9 C* ^
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4 w. T( C+ U2 \7 h;;;;;;;;;;;;;;;;;;;;;;2 ^5 z5 X. b' T% K) |
;; Setup Procedures ;;
' P2 x" m7 K* _& ]1 U" R# t;;;;;;;;;;;;;;;;;;;;;;
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. X) ^ {1 ? Q0 q x) |6 W;; Initialize the display by giving the global and patch variables initial values.
7 B+ P H, _' x;; Create num-cars of turtles if there are enough road patches for one turtle to
" G: k8 L9 X) j- a9 _$ H5 @ U' ~: o;; be created per road patch. Set up the plots.
5 I, h! }% u Wto setup2 E# A7 _6 n: h
ca
$ y) S# R6 h9 |5 o9 K8 V setup-globals) k$ p0 H! }8 D% L# q) y2 \* ^
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;; First we ask the patches to draw themselves and set up a few variables3 N0 w. c. u& q* S
setup-patches1 r& S4 X5 J# o7 f: c
make-current one-of intersections% z, H7 T; }2 j' D: R* D
label-current
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set-default-shape turtles "car"* c% m8 ~' E ]7 o* r: V% l* m
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if (num-cars > count roads)5 K+ l6 |+ }9 J& @
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user-message (word "There are too many cars for the amount of "
: C$ _/ t' U, }3 w7 v "road. Either increase the amount of roads "2 Q% m" `, h! \1 x9 X# t: q
"by increasing the GRID-SIZE-X or ", t3 S* [. I! S7 `, W. m$ [
"GRID-SIZE-Y sliders, or decrease the "0 w& u; ^; n7 j
"number of cars by lowering the NUMBER slider.\n"/ l/ P6 ^' D6 }
"The setup has stopped.")9 l! T1 t2 l! O4 `4 Y
stop8 X9 r) P {. P" S" P
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, k0 N4 b$ d0 ^. r* p% r! h. X- h ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
6 j1 g2 U6 V' Y* y( \ crt num-cars
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" u8 _+ Q4 U) B3 F' N" F1 W" l setup-cars
. o# p" Z; m8 Y! u% a set-car-color6 ~, i' ^% Q* ~6 R8 L
record-data3 n8 ^# R6 T' B1 v3 K" S
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; d) `2 k" N+ N9 z( @ ;; give the turtles an initial speed) t% \ y* `3 E! E) R b
ask turtles [ set-car-speed ]
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2 A0 i7 v+ l& x% B8 D$ y/ Z' X reset-ticks
: v4 t9 D3 b9 |: t8 j% w3 j( uend
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;; Initialize the global variables to appropriate values6 V& o$ Z7 h/ B) U
to setup-globals
* R8 \. g' L1 i/ I! J set current-light nobody ;; just for now, since there are no lights yet& E2 f3 I& k, }7 w( C+ N
set phase 0
3 ?& C$ L, i2 {$ n* m* X) f set num-cars-stopped 0
$ ?) A, U5 S" a set grid-x-inc world-width / grid-size-x
% ?+ I/ @% ^- A0 j8 L. N. ] set grid-y-inc world-height / grid-size-y1 |; w u, k9 A9 b3 o9 `
& Q/ k, P- p" s: y
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
8 B3 ~6 |- @) ^9 |5 p o set acceleration 0.099
# C0 V% D8 c6 L0 C; v2 eend
7 J) o o7 A. N/ q. U9 _4 }9 j* ]
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
# ?; Z2 g2 L# X5 H! C;; and initialize the traffic lights to one setting
. J5 Y6 @0 u5 d5 ^to setup-patches6 W3 C# x( |) D3 C2 C9 t) W
;; initialize the patch-owned variables and color the patches to a base-color# d& u; q9 A5 D" Z
ask patches! [3 d: s' @4 S& Y7 q4 R0 w5 `8 m% o
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set intersection? false# \% W1 B {! P/ }3 G
set auto? false7 z0 ?$ N, S3 i4 n
set green-light-up? true4 Q: k, @% \, S, ?% z* _
set my-row -1& F" C# I+ M* Y, M- R' B
set my-column -1
[ f! @8 a/ F4 v; U set my-phase -11 b, o2 F5 M9 ?; o% h
set pcolor brown + 3
7 w* p- C7 Y# T! L ]
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5 @0 ?8 Q& J" y V ;; initialize the global variables that hold patch agentsets" ^ \, ~/ a3 z' d. ~0 p" C! N1 ~
set roads patches with
3 s3 ?1 A/ h8 _1 U" a+ @; k8 N& y/ Z/ Z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ |( H& G2 G r
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]! ^( _2 ?0 v4 c8 s. z2 ~ ^+ ]
set intersections roads with
9 @, s7 S0 s& F' R) @$ s0 b [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
3 o$ i' p+ O% G( Q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
( s: s2 k6 L9 |# Z setup-intersections
% p4 C! ?& P0 ?- x+ K6 i. ^end
' }. u$ G6 Q7 h9 C. z( T9 n7 Q其中定义道路的句子,如下所示,是什么意思啊?2 s2 ]0 N* z- q! I; k; s
set roads patches with
: {; v; p Q$ g6 _5 ~" Q0 b [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: r) Y& g1 t6 b! U8 P9 ?+ j
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]: d# ?/ n" o4 z9 [
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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