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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。5 H" [# T) @8 Z
netlogo自带的social science--traffic grid这一例子当中,6 f; `! I5 ~. x% Q% t
globals2 m4 x1 [; R, d, j" Q# J4 ~2 i; z& l
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) Q# Q8 a5 I. I$ A" ~' s1 [ grid-x-inc ;; the amount of patches in between two roads in the x direction, l8 d. B2 D, h' |4 G
grid-y-inc ;; the amount of patches in between two roads in the y direction; O5 M9 m. K* K; ~4 C, k
acceleration ;; the constant that controls how much a car speeds up or slows down by if+ |( c9 j+ x* ?# Z9 G2 W
;; it is to accelerate or decelerate8 `; W2 @2 @ c3 D3 m; A
phase ;; keeps track of the phase% [: Y7 Y2 o1 K: K+ ^
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
5 }2 t# n' G1 _1 l; e- e9 M, W current-light ;; the currently selected light
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;; patch agentsets% t# Z9 B1 C& G
intersections ;; agentset containing the patches that are intersections
: ~% Y6 c6 B2 m# [# ^% }# ] roads ;; agentset containing the patches that are roads; {* E' e' z9 T! R3 w
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* ?& m: n5 n% [6 R. u8 rturtles-own8 p# h7 C! x9 E" v/ H+ X
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# ^/ e4 }" Z5 w( V% {& Z. S speed ;; the speed of the turtle
, P; }$ d8 h, i2 j+ M up-car? ;; true if the turtle moves downwards and false if it moves to the right
; W6 E2 w' s' q5 k+ [9 D1 u wait-time ;; the amount of time since the last time a turtle has moved& A) S6 Z" N6 G; T; L, a# ~" U b
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patches-own9 N: P( r* j0 a# R! Z! h
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8 }# f$ ~( x' J$ M% k& K intersection? ;; true if the patch is at the intersection of two roads6 F! @, \7 U9 q- J. ]3 l, G8 t
green-light-up? ;; true if the green light is above the intersection. otherwise, false.4 |3 ?$ l4 ~" R2 E7 |& S
;; false for a non-intersection patches.8 Y1 a0 [0 Z g9 o) j h
my-row ;; the row of the intersection counting from the upper left corner of the3 l6 A1 k" v$ J
;; world. -1 for non-intersection patches.
8 j) s$ k" E2 ^; I, C$ K& L9 A- J4 f my-column ;; the column of the intersection counting from the upper left corner of the
3 h/ H% ^. a+ ^6 F ;; world. -1 for non-intersection patches.
1 y3 P. i+ l: H: H6 `) s3 T- L6 Z) Z% T my-phase ;; the phase for the intersection. -1 for non-intersection patches.
1 B6 K8 T2 a1 T. P1 | auto? ;; whether or not this intersection will switch automatically.- x2 e# K$ F% f# @5 n. V% Z' |
;; false for non-intersection patches.
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8 O) P: h1 `1 R9 U( i$ e% u;;;;;;;;;;;;;;;;;;;;;;
* A2 d3 j0 p. }/ V+ Q( B; Z;; Setup Procedures ;;
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. \( p& W/ }1 o% |;; Initialize the display by giving the global and patch variables initial values.
- |! C. t P9 h;; Create num-cars of turtles if there are enough road patches for one turtle to
; L: I! {# P- j/ f* Q# E;; be created per road patch. Set up the plots.% l2 c2 e6 L h0 L) m
to setup" b6 Y/ L1 T0 }! m2 b2 K# L5 b8 o6 Y
ca
8 j6 J( o) g3 n: D setup-globals/ ^' d8 P9 s& A, N- z$ T" k
4 a; t9 i0 m# k" E$ S2 _. D } ;; First we ask the patches to draw themselves and set up a few variables6 S' y& j3 M( i% F3 f5 P7 ?
setup-patches3 l2 h; M. Y% p* A9 r
make-current one-of intersections; h; I1 k( ^1 T$ \/ h- _
label-current8 i* e2 h: d# ^0 W7 d6 z
, ~: f0 }" N( Z( {# W- W6 N: b+ N" {$ V set-default-shape turtles "car"* S( M' O. Z4 T
+ {2 h1 t7 T7 |$ F/ [ if (num-cars > count roads)
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2 I$ x/ d0 T, \ user-message (word "There are too many cars for the amount of "
- O! a& Z: r1 D1 O/ M "road. Either increase the amount of roads "2 q9 u) a3 a, B' ~0 ]7 J+ @: ?
"by increasing the GRID-SIZE-X or "7 E7 Y- z' G9 l$ x
"GRID-SIZE-Y sliders, or decrease the "# Q) B! \+ p: X! V' }% v) i
"number of cars by lowering the NUMBER slider.\n"9 C/ h% T4 G( C4 I8 o. t/ B, r
"The setup has stopped.")
2 G0 s* r- u7 ^1 X5 l$ r stop
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8 \; f9 V* ?; c, s) `6 e: X2 x9 ~8 m, q ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color: O0 }2 \& T( J8 |
crt num-cars
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setup-cars) Q7 H# |/ s4 @6 C7 r
set-car-color0 \+ i9 e0 E; @5 r8 \ c5 J
record-data, L; l* T3 U4 x1 ]6 x& }9 }5 G, J
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;; give the turtles an initial speed
$ I `, E$ U9 M% D# \ ask turtles [ set-car-speed ]
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reset-ticks
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6 P& X) Y& f. f* k3 d;; Initialize the global variables to appropriate values3 k/ k% j3 f" l* ^7 w
to setup-globals% C: w+ {% _4 Y) }. R
set current-light nobody ;; just for now, since there are no lights yet
* l4 L6 t1 n- k4 r) @) N7 [& V set phase 07 d9 O1 {& L6 N& N9 S4 L$ j7 ~. L+ Y
set num-cars-stopped 09 f E, ^+ j/ x2 P& `; K+ W
set grid-x-inc world-width / grid-size-x( i# y3 D1 ?' Y# H. o6 V! e
set grid-y-inc world-height / grid-size-y) E- }# v$ C9 K; }# D) a# t; [
) ^ f. D- b6 _5 A! ] ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary2 l% T3 b7 n& s' l
set acceleration 0.099" y5 p# N. ~ x% t2 V. U& x0 x7 V
end
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9 _$ q4 R r5 h6 ];; Make the patches have appropriate colors, set up the roads and intersections agentsets,
' Q: I. s$ n! t# b( h. t& |;; and initialize the traffic lights to one setting
]7 h5 q9 Z# F: f6 c3 n) y" J" ?to setup-patches
, E+ D t* o" w- w: x9 z9 y |# ^ ;; initialize the patch-owned variables and color the patches to a base-color
$ B8 ]; Z) X7 G1 ]# Z* q ask patches
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set intersection? false
& t* Y$ M' L/ C1 D$ K: Z$ Y4 C) [ set auto? false
$ H6 p+ K' P1 R: C1 S7 ] set green-light-up? true
/ u1 c! @0 U( s0 L9 I! O# i/ X set my-row -1
! T0 b7 b9 K2 d1 @, k* e set my-column -1
( R( C5 [3 Y9 K8 N7 k5 ` set my-phase -1
/ i7 U) z( s% @ set pcolor brown + 3* N* n2 J- `4 o4 `, v( ]
]
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# s% a" N' w9 Y& N! E7 \ ;; initialize the global variables that hold patch agentsets7 F! s& d' _ H) c' b
set roads patches with
5 c5 `4 j6 p+ l6 C S5 j9 u" D7 e$ l [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- @7 s( A. m6 |4 u9 U' b+ P- l (floor((pycor + max-pycor) mod grid-y-inc) = 0)], n4 U: S5 y4 ]% W
set intersections roads with
2 |4 r4 Q: e; k! a. M8 A3 B& i5 T7 g [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and5 x* n0 T+ E9 X1 r0 b
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* a& d) |6 m" t/ B
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ask roads [ set pcolor white ]% F8 D9 `0 v& F: L( b6 N( r
setup-intersections
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' ^" @! s' l2 J" T其中定义道路的句子,如下所示,是什么意思啊?* l, t0 Y5 l# P! O: A
set roads patches with" C% B/ d0 |8 h& i" Y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 t6 y y% ]+ ^9 |6 o: O. Q1 @9 B
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 H2 M8 p+ G8 V6 t3 r" c o
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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