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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 i* D9 Z' R% P9 y, N
netlogo自带的social science--traffic grid这一例子当中,# t8 F" x8 J w! `' {- S9 G8 ~# ?7 r- J
globals
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2 X, ~) ]/ x3 M# j7 _5 v. b3 v grid-x-inc ;; the amount of patches in between two roads in the x direction2 {! f6 S' p4 P, W' e
grid-y-inc ;; the amount of patches in between two roads in the y direction
3 E% b4 ?% d4 X3 X8 O( o5 ] acceleration ;; the constant that controls how much a car speeds up or slows down by if7 @& ~: H' ?" p: R0 q
;; it is to accelerate or decelerate7 {1 r& y9 M, J \( i
phase ;; keeps track of the phase% c9 r& o ~- g8 [9 o
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure* m. q8 ~( J2 s' X
current-light ;; the currently selected light
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0 W% D9 d5 @& ?# U ;; patch agentsets1 G" T- ^$ e3 l! I
intersections ;; agentset containing the patches that are intersections) T9 X+ j, ^5 Q, f
roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle, Z3 p1 [! n9 k0 K
up-car? ;; true if the turtle moves downwards and false if it moves to the right
0 U* P3 {( f! m- [# Q* b1 u; h4 t wait-time ;; the amount of time since the last time a turtle has moved" Z, D7 k7 \3 v/ l
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patches-own9 t; e. z+ ?6 }' H& E
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# `, _4 Z7 U: H7 b( a intersection? ;; true if the patch is at the intersection of two roads/ Z5 n* l. l8 }8 Q; x
green-light-up? ;; true if the green light is above the intersection. otherwise, false.# J4 x# ]! B1 M! q* Y
;; false for a non-intersection patches.
- w% z Y" w% n+ }% y my-row ;; the row of the intersection counting from the upper left corner of the2 c0 ~5 _0 |# o: x0 i, B
;; world. -1 for non-intersection patches.& q$ U0 v3 w, h4 J& W6 c1 a- i, Y
my-column ;; the column of the intersection counting from the upper left corner of the2 l: C' o7 f5 B
;; world. -1 for non-intersection patches.
* N1 l/ v+ |! _# V; j my-phase ;; the phase for the intersection. -1 for non-intersection patches.
9 F4 A! F$ T, T/ v+ _ auto? ;; whether or not this intersection will switch automatically.
2 a4 U: a2 p8 S1 C7 b ;; false for non-intersection patches.# }2 I. Y. g; x- b
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;;;;;;;;;;;;;;;;;;;;;;/ t6 h. ^- J% x$ U2 u3 v" Y+ H- i' _
;; Setup Procedures ;;" q w$ h' [! v+ t' Q& ] k
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;; Initialize the display by giving the global and patch variables initial values.
, ]" ]. |. J; L P) x, k/ g8 [1 m;; Create num-cars of turtles if there are enough road patches for one turtle to
9 `% ?% O9 g. T3 |. ]: h6 P7 u! R;; be created per road patch. Set up the plots.
0 [7 Z) S9 |4 S2 X6 Zto setup
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setup-globals( _7 j4 {+ d, }
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;; First we ask the patches to draw themselves and set up a few variables) s, C _, Y: |1 |5 r7 u5 s
setup-patches
T" I$ l y0 z' A9 h7 Q6 { make-current one-of intersections) Q' R: H7 R. V1 ` Z. h
label-current
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( k. n2 u# w O V set-default-shape turtles "car"
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if (num-cars > count roads)
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& c! _5 j3 \# ?7 c* ?# k1 c user-message (word "There are too many cars for the amount of "! ~8 z+ Z9 w {: `& E+ |
"road. Either increase the amount of roads "
0 l+ N9 L1 T$ E0 e "by increasing the GRID-SIZE-X or ". Q$ V1 E ~; v/ G2 u4 n. v
"GRID-SIZE-Y sliders, or decrease the "
; p Q. e5 d j/ z$ W) R "number of cars by lowering the NUMBER slider.\n"
* x5 v7 C) u7 X+ Q$ G( r% ` "The setup has stopped.")+ {0 o% B5 w0 L9 [6 L I
stop
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) n+ E, Z9 r! \7 y ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
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setup-cars
7 t: I) E$ `8 u8 I; S& S set-car-color
3 I5 w4 P5 V+ u record-data
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;; give the turtles an initial speed5 ?: u% {2 t+ ~6 i& p
ask turtles [ set-car-speed ]
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reset-ticks5 _# \8 E& e- f* }+ C. \
end
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3 b0 I4 f' Q& r4 i/ c;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet% C. L$ T ^$ z
set phase 0
+ `4 X/ [/ k4 Q' y set num-cars-stopped 0
" [( I$ `7 U; h Y& Y5 ~4 u! h/ X set grid-x-inc world-width / grid-size-x
. h# V$ z4 n. S set grid-y-inc world-height / grid-size-y5 U! |# C/ }" A$ k- M
: |0 c8 H7 S. f) L6 m ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
6 @# U6 v3 b1 Z/ e set acceleration 0.099
4 e# `) u# v& l# aend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
& c6 j2 e: E. J$ [# J" Q; ]% D' r;; and initialize the traffic lights to one setting( H, e2 W( K( n8 e+ w+ v5 ^2 ~
to setup-patches
6 d x! |5 @9 M ;; initialize the patch-owned variables and color the patches to a base-color; I; e ?' j- J. V9 t, F
ask patches) l2 |6 m c, \: r( `4 j: K) h9 E
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& }) |1 k; y t; a: a5 q9 c set intersection? false6 g9 k( U {. _1 O" M2 q. c3 {7 \! k: P
set auto? false, f, S% k4 G2 G! R
set green-light-up? true) T8 F3 T1 V' o; ^# Y* t
set my-row -1
6 h! m" z# r* Y; C U) _5 D set my-column -1
* a, T: F; l4 i0 { set my-phase -1
2 Q; F$ k G/ v2 v0 ?, w set pcolor brown + 3: |$ V2 s& _# ? s( @7 ]
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8 @3 e; l0 |2 z% g) j1 b' j ;; initialize the global variables that hold patch agentsets# p) ]7 V2 K; a/ S
set roads patches with4 U! k8 x. R G. ?# z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
( F9 K8 r% j3 ~* k' @. z) k$ J/ [0 U (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! g( F+ [- P. u9 x- q, i& R
set intersections roads with
7 {# g8 C& n+ R; T) {: @. Z x [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
& A5 }# F1 n; P* r0 V (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]' L0 ^5 E* {) X0 l
setup-intersections$ ~: s/ N( q: q. T# z
end$ O- a) `. q' |. |. |# W3 r
其中定义道路的句子,如下所示,是什么意思啊?
, \2 o- U! f, S set roads patches with% }5 ^& |" A) S" c" _4 `
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) G8 i) p* I6 p& Q* C (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) c3 C" d- r2 F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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