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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。9 c5 k" V/ E, y% ]) b5 }
netlogo自带的social science--traffic grid这一例子当中,
# s. f3 M4 J" Vglobals
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! K; U, h6 R% ?7 ?7 F# s! [ grid-x-inc ;; the amount of patches in between two roads in the x direction9 @3 I4 e2 O! m7 g% {! q+ E
grid-y-inc ;; the amount of patches in between two roads in the y direction
( t, d) X8 |+ T# P! B3 U3 \ acceleration ;; the constant that controls how much a car speeds up or slows down by if
& ?( P1 I7 D7 F6 v1 } ;; it is to accelerate or decelerate& @/ w- c0 L* e* v$ H( H
phase ;; keeps track of the phase0 |* F6 |( Z3 D! [( w( i" I N( Q
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
6 l6 L! ?" j |: a6 z1 i current-light ;; the currently selected light
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: f9 K0 o, l8 S# |$ W$ l. U2 I$ { ;; patch agentsets' c+ B5 @ b5 K) D7 g
intersections ;; agentset containing the patches that are intersections" e5 Y( n5 T$ `* Y0 p! y/ X
roads ;; agentset containing the patches that are roads
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6 b9 H( i; e1 o) H8 G, s, R4 C! ]turtles-own
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3 _% H# F: g: Z9 A5 B0 C* U8 z speed ;; the speed of the turtle+ B2 u# Y, Y5 \
up-car? ;; true if the turtle moves downwards and false if it moves to the right
! R; v1 D9 J5 _" O4 _ wait-time ;; the amount of time since the last time a turtle has moved
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patches-own8 h$ j9 u6 K: z) J+ k$ J
[
. D1 U- n0 o+ g6 e! Y/ o intersection? ;; true if the patch is at the intersection of two roads
3 p+ e6 t$ F* M1 @ green-light-up? ;; true if the green light is above the intersection. otherwise, false.
2 I( @2 J$ H2 d) }& ~: V$ ^: h ;; false for a non-intersection patches.2 |( j7 P9 Q* S
my-row ;; the row of the intersection counting from the upper left corner of the
' J/ ^. y8 U# p4 c7 z; q6 Q ;; world. -1 for non-intersection patches.8 Z; u1 _* L0 m0 `+ p k! L( G
my-column ;; the column of the intersection counting from the upper left corner of the
t& v' e' ?. J) d% |2 o, c ;; world. -1 for non-intersection patches.2 N% x6 M0 A/ [' G! h0 |: I" ~
my-phase ;; the phase for the intersection. -1 for non-intersection patches.8 i5 R- I& @: n+ B7 j
auto? ;; whether or not this intersection will switch automatically.
( u+ H3 J3 u! V6 r ;; false for non-intersection patches.' }5 B3 p! X) X0 w/ P7 ]
]
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5 n4 C, E. t! a7 S0 w: a;;;;;;;;;;;;;;;;;;;;;;. I) \8 Y% W5 A, p8 A3 S# j
;; Setup Procedures ;;1 E) O5 @: @2 `. n! R
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( I1 n5 M. L# x; H;; Initialize the display by giving the global and patch variables initial values.
# c8 Q6 j/ O: [+ g2 w. k6 J- B7 D! I;; Create num-cars of turtles if there are enough road patches for one turtle to0 w/ Z% t8 Z2 X. _9 R
;; be created per road patch. Set up the plots./ W: u9 b# j7 `4 y \6 V5 L, D
to setup
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setup-globals X0 B6 H+ P% N5 G. ~2 U( C
6 |$ w' F0 }' S3 X3 N/ w* V0 k1 z ;; First we ask the patches to draw themselves and set up a few variables5 B8 A& x; j. f# d) f8 R( O0 r
setup-patches# \% z' ~# B% |) O
make-current one-of intersections/ n. T0 h' M1 m) _$ k6 v4 [
label-current% J* B7 ]! f/ r2 }1 K/ I
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set-default-shape turtles "car"0 Y; l$ t/ W3 `& @' v( V2 T
7 k0 l# [, f$ P0 d if (num-cars > count roads)/ d) ~# N% p' o2 v
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user-message (word "There are too many cars for the amount of "
7 ~/ A' V1 l) _, z9 z% e x "road. Either increase the amount of roads "
4 }9 E5 _( s- h( ^4 b! _& B( V* [ "by increasing the GRID-SIZE-X or "
3 X* q: M, h! J$ R% @( y "GRID-SIZE-Y sliders, or decrease the "
8 g! ^1 {. p4 s6 |8 `! [* ` "number of cars by lowering the NUMBER slider.\n"* R, B% L+ n8 p7 W( I, D% E$ d: @
"The setup has stopped.")
0 B* z3 d8 F4 U0 r) k$ k4 D stop) Q2 o6 X7 X5 B, T
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6 D, Y( @; a* H! W) n1 J ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
, g% a: P" D( K- C# W. }& { crt num-cars. M9 u6 E4 w5 ~. p
[
7 Z1 X) X* A2 O9 o; h$ q* v# S setup-cars
. ]! I) t1 F/ W, ~2 q! J! } set-car-color
0 ^. X- ?* f6 e record-data6 M6 g/ c) l% U1 Z6 T
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;; give the turtles an initial speed# @7 z* I- n) |1 C
ask turtles [ set-car-speed ]+ ^9 u( M* |- o! r
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reset-ticks
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;; Initialize the global variables to appropriate values
, `( L' G5 I. k3 G7 [% Q$ Pto setup-globals3 J T; j9 V: {. X! x$ B9 r. j
set current-light nobody ;; just for now, since there are no lights yet3 z8 T) I$ w+ |1 s8 g& L3 p: e7 k! u
set phase 0 [) a; k0 H+ }# h+ d! X, y
set num-cars-stopped 09 h7 \0 I& Z4 s! ~3 j
set grid-x-inc world-width / grid-size-x( M- A: T1 q2 p& J& v$ t
set grid-y-inc world-height / grid-size-y: Z* _! {, I5 M
( A' D! |; ^+ n5 ^" Y6 } ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! d, |6 w. y, f$ I: ~ set acceleration 0.099$ `: }/ k& n1 |8 V- ^; t% Y
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,0 V4 e% R- i* H1 d9 }. K$ ^
;; and initialize the traffic lights to one setting7 d; ?" m/ y" W! Y8 e3 B
to setup-patches
/ u' @ @/ l: T ;; initialize the patch-owned variables and color the patches to a base-color
1 V9 A9 i. x' T* z) ?1 ?; i ask patches
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7 `9 x: N% S1 X) t8 f N- o. e1 K set intersection? false
+ O' O/ U6 [, k7 I1 h set auto? false
0 k+ C# R v+ m0 `" \: A set green-light-up? true: W3 B2 T; u- ]' U7 K8 H
set my-row -16 W; J$ S, b# v! ^" o
set my-column -1: g2 L9 Q* r6 q, u- I& {
set my-phase -1
! O/ h+ ~5 p) k2 e set pcolor brown + 3& _# [. K: @- V
]
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;; initialize the global variables that hold patch agentsets" B( Y' u+ l2 z) p1 a
set roads patches with0 s4 u- _+ j( a3 \' }# e( M( L
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 o. q: Y1 t6 p5 }
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]: t, k3 D; L( l1 W8 e
set intersections roads with
; t! w& z8 t( `. w" c' j4 Q0 x [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
# v1 p* s2 h/ v f1 t3 x8 f' x (floor((pycor + max-pycor) mod grid-y-inc) = 0)]% l7 b3 X1 L9 p8 O5 Z
. q9 S" v! \! ^: c* L2 x ask roads [ set pcolor white ]
* [. Q8 u+ X' U4 M' S$ U( g9 V, X setup-intersections* s* p( \: S/ h( B9 R
end1 W2 ?9 _4 c/ h. U) Q( G! Y' F" `. E4 `
其中定义道路的句子,如下所示,是什么意思啊?) H u+ @; ?) F3 V2 g. h. Z$ x
set roads patches with5 E) _$ Q7 Q- s2 M c! q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 x& p6 X# e+ {. n- I
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ n1 ~. O( Q4 t" m8 v. ]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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