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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。( @2 |3 s6 }- ]- C
netlogo自带的social science--traffic grid这一例子当中,# |9 M4 V1 s; E- i: W
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction3 @3 t( ?. c6 ]* p" t7 b
grid-y-inc ;; the amount of patches in between two roads in the y direction
' t. X% T1 ?& K# l! N" ] acceleration ;; the constant that controls how much a car speeds up or slows down by if
2 f. I0 P- ?) b ;; it is to accelerate or decelerate
' \! D$ L& \4 j. @' p7 a+ {2 | phase ;; keeps track of the phase
& H) q- b' f& Q num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
( W; K- F( ^: L5 [. `0 U5 b current-light ;; the currently selected light8 O5 y* \( T B! S& Q
8 x4 H' O4 w! P; i ;; patch agentsets
" P# H" g& N9 r! ?+ ` intersections ;; agentset containing the patches that are intersections3 J9 a' F$ B \8 n7 p
roads ;; agentset containing the patches that are roads2 Y8 l9 r$ z2 ?! B6 i* X2 `5 ]
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turtles-own
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speed ;; the speed of the turtle* p% j8 U1 y( Y
up-car? ;; true if the turtle moves downwards and false if it moves to the right: _9 r6 _8 m2 W! Q; W0 i7 t
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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- X( B1 a0 ~% U3 U, l intersection? ;; true if the patch is at the intersection of two roads: h6 f5 [) ^; P5 C$ ?" j/ M
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
) o' m2 z3 M6 m6 ? ;; false for a non-intersection patches.
9 a" n1 Y5 n2 ?- q) K0 V3 u my-row ;; the row of the intersection counting from the upper left corner of the1 i4 a+ p( u% W6 ]# u
;; world. -1 for non-intersection patches.' c; q# J8 U: h& j% |
my-column ;; the column of the intersection counting from the upper left corner of the& Y4 M3 M9 `8 s9 _( t
;; world. -1 for non-intersection patches.
- ?1 ~% p. z" X% n3 N# Y my-phase ;; the phase for the intersection. -1 for non-intersection patches.
6 A! `. M8 u3 K# C/ i0 H' f- z auto? ;; whether or not this intersection will switch automatically.+ Z& l: B# a# q! N' q4 b! Y! D8 I
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;* B4 q/ x; [1 B: H- X8 [$ ^ h# Z
;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
& `! `- D& A6 t1 l: N;; Create num-cars of turtles if there are enough road patches for one turtle to
3 I( p9 q1 {* f4 f# U;; be created per road patch. Set up the plots.3 G1 |5 v9 @/ p$ G
to setup. [6 `+ P! A1 R0 C1 }5 f
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setup-globals
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% Y* {* {' d- f& T5 V+ R ;; First we ask the patches to draw themselves and set up a few variables
5 s4 w( A2 A! E1 n: l# b setup-patches
7 z4 K- P( |* @9 G% u/ x make-current one-of intersections
: j2 R- A9 T4 F ?$ S, v N label-current- H+ J6 D8 ?3 k+ `
+ c& ?* S( L H% ?# j set-default-shape turtles "car"; e" e3 T) I( K. g( T4 r
7 L% y3 O r# o9 [1 _3 x2 A if (num-cars > count roads)
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6 n9 y/ J6 B" i" i! e3 O8 N. K) ` user-message (word "There are too many cars for the amount of "
7 n7 g7 b2 j- F# D+ x# U# s5 S "road. Either increase the amount of roads "
. f- x8 s" m! ?- i2 A8 O "by increasing the GRID-SIZE-X or "
: A% p0 u# s$ ^" f+ D8 a "GRID-SIZE-Y sliders, or decrease the "
. `* V3 ~# W4 ]. k "number of cars by lowering the NUMBER slider.\n"
( x( E- I6 \# z4 N# Z2 G "The setup has stopped.")' H9 t0 w/ w' b% L1 C, [, T6 s
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
R* t* l0 I l& m% @% E crt num-cars) D1 ~* e2 d, q
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setup-cars
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5 ]: q0 r3 w1 \ record-data
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;; give the turtles an initial speed& y" r' u+ J- j; g: a5 A
ask turtles [ set-car-speed ]4 U' o/ w- h. S' M
; H0 A/ j0 ]- W: E reset-ticks
9 y* [/ @2 U; b0 E# L2 Eend
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8 Z0 O" D# k9 Y8 V/ J. A. X1 f$ i- X;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
% O# j% G$ |- \! n6 `3 L set phase 0
/ g0 G7 d6 v! r% i5 d# k set num-cars-stopped 0
' w# O* w! f. @1 C Y set grid-x-inc world-width / grid-size-x( |! v, A* h6 b9 w, b2 R
set grid-y-inc world-height / grid-size-y& N# K( S. H4 m& A+ e
) p- h# Y7 t' ` ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary: I' Y2 G& @) t/ ^* P: R
set acceleration 0.099 g) q7 i9 r; ^! Y3 Z! W
end
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) N' @5 o' C) W$ {; F2 b;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
: L3 G: J; d3 r4 V, [;; and initialize the traffic lights to one setting
8 }& [/ n9 z- R9 W' A% D/ [$ F8 ~0 Yto setup-patches3 c% ~4 O. b4 z {! Z( Z; h
;; initialize the patch-owned variables and color the patches to a base-color
$ l. ]% u3 U6 t9 O7 M, b9 D, c$ e( g$ e ask patches
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set intersection? false
& v+ H$ a& S0 n) k! Q7 q8 y set auto? false& j" c4 H% j/ L
set green-light-up? true6 {0 `; e" r+ c& k; Y
set my-row -1$ u/ D6 H. L# B! X3 Q! R
set my-column -1, k# J2 R% q- h* x& g3 i
set my-phase -1: J3 P- _( s! }& [. Z
set pcolor brown + 38 ?$ ^3 [7 q7 J9 D
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;; initialize the global variables that hold patch agentsets
u/ ?" z) y) m set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 |5 O& S P) g( X1 l; k' R: |
set intersections roads with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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6 f s: f _( D0 j$ G; ^7 [- o其中定义道路的句子,如下所示,是什么意思啊?
9 |0 f, J4 a+ L set roads patches with) v" K" F6 }- @. k g: _
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 Q* D/ h+ R7 F4 [ (floor((pycor + max-pycor) mod grid-y-inc) = 0)], H# i( u7 b- @% o- k. T
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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