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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。4 B; N$ R. r- t Z9 p1 j
netlogo自带的social science--traffic grid这一例子当中,
) ^3 N$ M, L( ~, j. p1 D, Hglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction8 @2 i& M: O" @
grid-y-inc ;; the amount of patches in between two roads in the y direction
/ P) ]& m" T0 U5 @% E2 g+ ] acceleration ;; the constant that controls how much a car speeds up or slows down by if
! ~0 @0 _9 `0 a& M" L ;; it is to accelerate or decelerate
3 E( {, S0 L6 D1 e phase ;; keeps track of the phase
9 `' P/ ]" e; O( @& r num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
9 ^: z' P" _ ^$ _) x current-light ;; the currently selected light+ i6 a3 R) ]/ Z( `
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;; patch agentsets
& i( G9 r- Q2 f" j) ]9 | intersections ;; agentset containing the patches that are intersections4 i4 {: D M6 b4 B- o
roads ;; agentset containing the patches that are roads
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turtles-own
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7 v5 d# k; z6 f/ ?, \6 u/ ` speed ;; the speed of the turtle: l" r8 N* T6 \7 C, f# I% }8 ]7 B
up-car? ;; true if the turtle moves downwards and false if it moves to the right
# N5 E5 e% E; I# l wait-time ;; the amount of time since the last time a turtle has moved
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( K' H& v" S+ C6 M, Y7 Cpatches-own$ ?5 {! k1 G' q% Y+ h
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P- s5 y, z, s7 X g intersection? ;; true if the patch is at the intersection of two roads: q) g6 S. y S0 p
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
" i" w$ r. X( `4 o6 ] ;; false for a non-intersection patches.) d: Q6 ?& c/ Q. V- U1 w; e
my-row ;; the row of the intersection counting from the upper left corner of the
; Q$ t. q4 M" d) E5 X+ }! J* M ;; world. -1 for non-intersection patches.
4 ~) l; A. y7 j: x0 e" T/ k! P my-column ;; the column of the intersection counting from the upper left corner of the
$ X5 ] `' e6 z ;; world. -1 for non-intersection patches.. D" P6 Q' b6 Y% {9 l6 d
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
- k% F2 y+ d) F( @' k: N auto? ;; whether or not this intersection will switch automatically.
( p0 q* G7 J1 f$ A5 M) S7 w1 Q$ k ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;# A! O1 K5 m! a- ~8 D7 T+ \" ~
;; Setup Procedures ;;; e, j! u) P3 ]$ {( l% x4 G
;;;;;;;;;;;;;;;;;;;;;;
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0 m; V+ D6 z! q b) C; K) v;; Initialize the display by giving the global and patch variables initial values.
' m2 B8 ?! ]$ {6 f0 _;; Create num-cars of turtles if there are enough road patches for one turtle to) m* g5 X/ C3 ^* t! Y' H5 G! i. \
;; be created per road patch. Set up the plots.
2 ]# r3 [" D/ x o5 A Zto setup
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setup-globals2 s6 r6 K# t) K" G v
3 q) R& W7 G; j j2 h ;; First we ask the patches to draw themselves and set up a few variables# f7 m. X+ n* a4 x2 q" B
setup-patches
' ]% [% H9 b8 S1 L% e+ B1 h- u: U- D make-current one-of intersections: l' z3 O) E4 z& z- ~0 [
label-current: K! `" P+ D) N! J, k
3 D4 g! v' @$ G. l' C, s set-default-shape turtles "car": T/ s5 W6 x, k' Y0 o
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if (num-cars > count roads)
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. X2 @; I3 Y7 E. t+ k8 G% N% K user-message (word "There are too many cars for the amount of ", y3 C3 ^1 x0 Y" S- |
"road. Either increase the amount of roads "
: F% E' A" l) h$ q "by increasing the GRID-SIZE-X or "
2 D2 z/ j/ r* H% x "GRID-SIZE-Y sliders, or decrease the "% W0 A; A; k3 t7 G2 f- m2 ] p
"number of cars by lowering the NUMBER slider.\n"$ C" h6 F. v* K
"The setup has stopped.")
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" F5 e' N( s2 P( i. _5 h ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 y. u2 [5 T, X, Y
crt num-cars6 Q- J' S& v- T& R) \4 A7 U
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) x/ V. m1 ~- s; f! Y, k' o6 @, w setup-cars
) U% q; r5 s: I+ c/ I( j8 U set-car-color: u# J" k6 H7 H1 K, D* Y
record-data
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;; give the turtles an initial speed! } K5 x+ i, l1 X$ N! L
ask turtles [ set-car-speed ]
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% @) e* { J9 A; E reset-ticks
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6 K' M; z" ^: Y+ k0 r. }4 E, ^;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet' H! f) b/ l8 n/ M
set phase 0: h) W, }0 m3 [- ?# \. q: }- E
set num-cars-stopped 0
3 m6 f b$ ^- c& r' ? set grid-x-inc world-width / grid-size-x5 w* i9 ~) D5 b+ ^# D
set grid-y-inc world-height / grid-size-y$ I; I n. E% Z* q% v- j, f7 b
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary7 g( C; Z) k' l+ h/ V1 R) N) H
set acceleration 0.099+ D9 ]" u# R* q' L
end- t- s+ s. m6 ]
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
- A, S2 r% F: F/ u$ U5 |( ?;; and initialize the traffic lights to one setting
/ p' j2 e8 |# ^5 jto setup-patches
0 l( w4 U: I# ~' M! ^/ [ ;; initialize the patch-owned variables and color the patches to a base-color
. f& x9 V5 Z j; \6 t `/ W ask patches& G) p' Y9 X7 u
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8 H7 p$ v, w' U2 W, }4 c set intersection? false" J; N/ B7 w+ Z* x! z
set auto? false' L6 b& ^: z8 l9 Q
set green-light-up? true
) D* O. S1 i3 H9 K set my-row -1
0 N. {4 m& K* m8 `! x set my-column -18 T! [! x& _; E9 Y5 ~1 h
set my-phase -1
' q5 @! P+ N" Y2 c9 ` set pcolor brown + 3
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5 d/ }7 l; d4 v/ @& P ;; initialize the global variables that hold patch agentsets
4 j1 g& E. K; p X" m# i$ u set roads patches with
; ~. i+ B; m- j5 Q$ d3 p$ f4 k [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& Q& \& I7 k$ U1 V, [, K% [9 T( F (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 K ]3 P: ?5 H0 O: P. G5 D' @
set intersections roads with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) p& d2 R$ d, O" N0 g
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ask roads [ set pcolor white ]1 W+ r N! F5 @, d
setup-intersections
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6 d% C2 C. [( E5 {其中定义道路的句子,如下所示,是什么意思啊?
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. P/ k' P" ^ A6 u. G" c4 _5 f( G, L [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
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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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