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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。% i5 l8 ?" [* e: i: u
netlogo自带的social science--traffic grid这一例子当中,
1 L; n, g9 I6 K$ Q2 a. ^7 wglobals0 l" O! f+ X' }3 g' s) f
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grid-x-inc ;; the amount of patches in between two roads in the x direction( j! P8 Q3 p1 ]6 Z% ?* E
grid-y-inc ;; the amount of patches in between two roads in the y direction
: {2 x* A; H0 g. a) [+ H# z* u acceleration ;; the constant that controls how much a car speeds up or slows down by if- p$ ^: c2 `# A: H
;; it is to accelerate or decelerate9 c+ s7 l$ d0 k; G" O: d
phase ;; keeps track of the phase# ~- R, k" V3 I0 A( X$ b$ V* s
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
) S5 W, N* f; G* x# g current-light ;; the currently selected light
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;; patch agentsets& A8 A' ~+ X+ v$ m8 @
intersections ;; agentset containing the patches that are intersections) q" t9 {( O" s z
roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle9 K% I. J3 b7 E
up-car? ;; true if the turtle moves downwards and false if it moves to the right- j- n4 U* I# L# C5 u; Q
wait-time ;; the amount of time since the last time a turtle has moved
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8 V, A. }) O b C2 K I, `patches-own
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intersection? ;; true if the patch is at the intersection of two roads
6 j2 R0 N Z$ m% J/ V green-light-up? ;; true if the green light is above the intersection. otherwise, false.
" ~. B! R3 g A9 d" N' @ ;; false for a non-intersection patches.! v) w# v1 Y1 r: R5 ^& P
my-row ;; the row of the intersection counting from the upper left corner of the2 J/ Z$ m( |, C- h+ ~8 M
;; world. -1 for non-intersection patches. q6 D& i7 F' |9 \3 g
my-column ;; the column of the intersection counting from the upper left corner of the( v; o& q6 f6 B" s0 o0 J
;; world. -1 for non-intersection patches.5 n5 I8 \( k# z; x2 l, _
my-phase ;; the phase for the intersection. -1 for non-intersection patches.* @1 ^5 t c& v9 i' Z L6 \" z
auto? ;; whether or not this intersection will switch automatically.
& J) I; i2 B3 q ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;7 p' {5 F* C; {- n7 d- ?! i
;; Setup Procedures ;;7 }3 x/ Z! V* z3 _( {* t5 z6 v4 ^
;;;;;;;;;;;;;;;;;;;;;;- ?$ ~$ V% \- X: _2 O+ N
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;; Initialize the display by giving the global and patch variables initial values.
& o. I* l! I) J# O;; Create num-cars of turtles if there are enough road patches for one turtle to- a* g9 \! U) i1 F9 O
;; be created per road patch. Set up the plots.4 I/ b% |6 |( D& b
to setup' F; O `) j) f7 g" T/ `( {; J
ca
4 O; F% g. V& N; o9 G; Q setup-globals
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;; First we ask the patches to draw themselves and set up a few variables- z" {/ \7 q1 j! K& }
setup-patches
/ ^4 {" u8 C( X make-current one-of intersections4 {0 T. [% [9 h0 Q
label-current
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9 {8 P5 F! k( Z v+ B3 G: _0 ]* h- ^5 p set-default-shape turtles "car"" n: ]6 c: \: K
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if (num-cars > count roads)
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( o. A6 \. T7 ?1 O6 q7 S user-message (word "There are too many cars for the amount of " q3 ^ X5 Q1 b# D% x% I+ r; G
"road. Either increase the amount of roads "
! P) G8 ?$ h& y "by increasing the GRID-SIZE-X or "
" |' i, L C0 X u6 v "GRID-SIZE-Y sliders, or decrease the "2 |1 d, ?, }' Q0 L# m
"number of cars by lowering the NUMBER slider.\n"/ ?6 P# }5 ?! M( w6 h
"The setup has stopped.")
' }$ V1 C3 O2 W& z9 P1 D- f' g stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color2 ^& n, i3 r' Z0 ~: O& P
crt num-cars W \% h- e$ w# d4 C7 _
[
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/ j3 T+ `% @0 Q: |% E( Q2 M' o7 J. t set-car-color$ f4 x: m) k2 J+ v$ ^
record-data
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;; give the turtles an initial speed( T, b3 j% d5 O ~* }2 M
ask turtles [ set-car-speed ]- A5 Q, C5 ? S/ @$ T8 I) H
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reset-ticks0 p% e5 k' a$ e9 C7 U
end& U& r ~- [- `, C- G
7 A3 p: g* {) }6 _. Z) B" M;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet+ l. ?2 @" d- J W- a/ O8 `) G8 d
set phase 0. e* D# a4 G6 l, K0 A2 R
set num-cars-stopped 02 m4 A& }& c" Z' W
set grid-x-inc world-width / grid-size-x
! h9 C0 A1 Y3 q% A set grid-y-inc world-height / grid-size-y
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0 v( F) A. _1 x% R+ O4 b4 G6 y! C ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
7 T. O. l9 R4 l# D set acceleration 0.099
$ C8 `6 ]3 Y+ X8 |# b6 Nend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
1 t" J' o2 |) Q* z% ~, [/ o5 j;; and initialize the traffic lights to one setting& ]3 z0 {" Z! S1 s
to setup-patches
, j7 v* y/ P c ?9 D1 g4 K ;; initialize the patch-owned variables and color the patches to a base-color
2 t2 X6 y1 M7 Q) v, Y ask patches
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set intersection? false
e+ v$ q! ~# n' Y* M; [- ^ k set auto? false
1 J% O' c7 p/ c1 S `3 |/ @ set green-light-up? true+ _, a. t. ]1 r8 }! Y: U# k
set my-row -12 J5 g4 _4 d, p, [ r& @
set my-column -1
+ e2 F' A+ R/ c0 Z8 m set my-phase -1
. W( V9 j0 |7 ^ set pcolor brown + 3
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/ G( U5 U, Y9 _) W5 u: h6 U ;; initialize the global variables that hold patch agentsets
/ |" V, ~/ C1 B7 u3 K set roads patches with8 X0 R) M7 r8 i$ Z" M9 A
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 U3 u! G7 Q& J* }/ L# K- d (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 G8 n, ]- i: {5 Z# Y' B
set intersections roads with: k1 L4 Y g6 K+ t/ ^
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
; {0 Y7 v; z0 O (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ], o: ~! m7 l2 B2 l. Z' I: q, Z* y
setup-intersections& f/ U% I3 ]! G8 n+ y- s
end
* f7 ]: W- Y" s# _& d% m/ i- R其中定义道路的句子,如下所示,是什么意思啊? T, R; e6 X3 ?' F$ t
set roads patches with# j! ?3 R7 |3 s4 k0 t
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 w1 s. X8 u9 O4 h/ _
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& {. i, P- i X/ S5 _3 q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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