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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。
3 L9 F g# e1 O! [5 v5 x+ Y! qnetlogo自带的social science--traffic grid这一例子当中,
, P4 X! L# L' V" s$ t7 k2 n# I4 Dglobals3 l5 f- w: \, m0 L' }6 ~5 G
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grid-x-inc ;; the amount of patches in between two roads in the x direction
) M) q q) P% m! V0 w9 Q grid-y-inc ;; the amount of patches in between two roads in the y direction# R! ~& f! F# J
acceleration ;; the constant that controls how much a car speeds up or slows down by if+ \- O# M% Q A: F# C
;; it is to accelerate or decelerate! ~) t# A/ ?, b: \- @, ^% F- d$ O
phase ;; keeps track of the phase
9 C/ U8 v% ` p, m num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
/ ~3 C7 l: `" t- D0 k9 A& P current-light ;; the currently selected light
+ V" ^: V0 ~) O, ?# X0 I( ]1 H- c; Z! Y8 [! k% b" |; P. t' p7 @# j
;; patch agentsets
4 ]4 E T- l: g$ w1 t intersections ;; agentset containing the patches that are intersections5 G1 ?" Z+ c9 L @/ H% c
roads ;; agentset containing the patches that are roads
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2 ~' l2 e: l: ] c4 K ~5 ?turtles-own/ X- V! D2 y0 w' x
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speed ;; the speed of the turtle8 l# c+ Q1 }, l1 i- i. ]1 f. o& S
up-car? ;; true if the turtle moves downwards and false if it moves to the right
* W$ i' R% d. M7 Y0 L4 k wait-time ;; the amount of time since the last time a turtle has moved4 M( G. y# G' t0 j
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patches-own
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) D1 D+ n9 U# e# B- ~ intersection? ;; true if the patch is at the intersection of two roads
3 C# S8 h5 l2 k8 ~8 Y$ j6 [ green-light-up? ;; true if the green light is above the intersection. otherwise, false.
- Z: B: P7 f7 B+ p ;; false for a non-intersection patches.; o1 I1 ], X: ^" s
my-row ;; the row of the intersection counting from the upper left corner of the; ? D# }# e# d m9 [( W
;; world. -1 for non-intersection patches.. h# o- y2 E0 n+ q& J1 q
my-column ;; the column of the intersection counting from the upper left corner of the- Q5 _6 S& t- Y9 ]
;; world. -1 for non-intersection patches.
' [2 J. _1 p$ |) d7 Q- @: q my-phase ;; the phase for the intersection. -1 for non-intersection patches.
4 P' i& G7 }5 U2 _ auto? ;; whether or not this intersection will switch automatically.9 k5 V- e+ ^, i' ?' c: e
;; false for non-intersection patches.9 i5 [6 p4 e& a( R/ ^
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8 O- t: E! D+ A9 h4 y;;;;;;;;;;;;;;;;;;;;;;
7 X4 ]2 L7 y. Y;; Setup Procedures ;;
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+ Q& w2 z8 e: b3 A4 _;; Initialize the display by giving the global and patch variables initial values.
. b" R, R* o4 G6 l. f;; Create num-cars of turtles if there are enough road patches for one turtle to9 ?) P0 D9 R: N" d2 g7 r
;; be created per road patch. Set up the plots.5 R) a+ o2 A0 _6 N0 m& j5 F3 e: X
to setup3 M/ r$ i/ W. l' s
ca
; F1 |/ W4 G4 c6 m9 d; E* } setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
+ ?+ v L- x& S setup-patches! s8 Y% d/ k' x2 c# a1 y) Q9 {
make-current one-of intersections4 E$ X: N# u7 s% N$ m: m. D
label-current
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set-default-shape turtles "car"/ V/ U, ~' U+ u9 u+ h Q
" g& B8 u7 K- }% a) s if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "4 ~2 Y) f6 V" D \9 x: c' a
"road. Either increase the amount of roads "
6 E- ]3 ]3 K/ U/ b$ l. J- ` "by increasing the GRID-SIZE-X or "
, _' W8 ~0 g1 X+ n& y! j "GRID-SIZE-Y sliders, or decrease the "% @7 b5 C/ |3 N( b/ O
"number of cars by lowering the NUMBER slider.\n"7 }( y2 b% B4 B# g, R1 j5 a3 L
"The setup has stopped.")
3 g: b1 T: j {. z5 Q% _ stop
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3 y9 q0 @& l4 A8 t" a+ ^ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
) a; K& [4 T9 J3 ~* g crt num-cars/ }0 e" w4 R# Y0 G7 c* y5 v
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setup-cars c7 e6 {8 D5 E5 O' H- n
set-car-color- H8 N* }4 P5 Z" ?* m/ D
record-data- M0 {, q& k! ~& ]2 f6 }/ a2 s. s
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" K0 c7 O- J( W( [$ s ;; give the turtles an initial speed7 G# ^0 {# p& b! N" i9 N
ask turtles [ set-car-speed ]
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4 ]$ d* L3 e/ y4 Q9 X5 F reset-ticks6 g% x* ~; Z" q, E6 G1 W6 K# `
end
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$ F& {+ K1 o- w' R2 c, B( C;; Initialize the global variables to appropriate values$ d& p' J5 N9 f; }; r8 H
to setup-globals% \3 ~$ K% X5 ^: J
set current-light nobody ;; just for now, since there are no lights yet
2 V0 F% c; ]. d1 l set phase 0" T& [9 n( d8 n: {
set num-cars-stopped 01 Y9 q+ U+ P7 @3 G# h* H9 ~
set grid-x-inc world-width / grid-size-x
$ a& y& a- m: G! x set grid-y-inc world-height / grid-size-y+ j/ c) ]# ?" W! r2 Z9 d# F
7 g8 Y- H( J1 y' T k& `! l ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary6 } n6 Y* D6 x
set acceleration 0.099
) @7 {1 K5 F o Z% E- Fend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
6 l1 l8 T' d# m T5 I;; and initialize the traffic lights to one setting% o' C7 O: V) S# m9 y9 m) W+ Z2 p4 H
to setup-patches
: H- D3 |0 o ~/ P1 T ;; initialize the patch-owned variables and color the patches to a base-color
( g) I& L+ U0 R# l ask patches) U2 K6 C3 m) h# J) ^7 M3 c
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set intersection? false' \" `$ R3 x9 p* V/ Q, X# d
set auto? false% Z* N; x8 A% I5 _+ K0 c R5 G8 P
set green-light-up? true
: o; p+ D7 P: ?# h0 W set my-row -1
( t" t# ]; E g, @! w- i4 a set my-column -1( c3 `+ a& `/ [. K2 J1 Z
set my-phase -1
! U. s8 |" ~0 @' K6 }- G5 V set pcolor brown + 36 L5 ]$ H, ~6 T$ h' F4 M# J
]
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0 ]0 ~( D: I7 m$ W ;; initialize the global variables that hold patch agentsets1 o3 Y7 V( W3 M
set roads patches with3 U$ I5 A# Y5 g1 C
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, E' e! y7 z9 k5 `/ `: K, }
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 s( F, i) m' F8 d0 c set intersections roads with
- q* B0 H/ t4 u, a, d [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
6 T# y1 ~9 O2 M2 N0 { (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* {, S" ~, q1 r! v6 d$ x5 w: o
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ask roads [ set pcolor white ]) b. x% \1 _' Q4 m5 U/ n9 g9 e* `
setup-intersections; q+ k9 w6 Q0 [5 ]/ U4 s
end% V# h p8 M5 I9 n D
其中定义道路的句子,如下所示,是什么意思啊?
) \( x2 k, y' J' T set roads patches with
3 u* K/ q3 P5 B" q& u7 O& b [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) T! O* U. y; y L) N8 C8 M4 g! I
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 I+ {; C7 u: s% j" 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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