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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。+ Q# f6 {# k: i% A4 t3 s7 r
netlogo自带的social science--traffic grid这一例子当中,6 ~, M" u# z" N# K5 A
globals3 a+ h$ V* Y% X7 v
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) j- m5 U# x0 g" m; y! E" }" y7 o8 F grid-x-inc ;; the amount of patches in between two roads in the x direction
9 U# Z. S. v: ~1 C+ m _4 w. u7 E grid-y-inc ;; the amount of patches in between two roads in the y direction; p O% c- Y9 }
acceleration ;; the constant that controls how much a car speeds up or slows down by if
6 L! Z) w0 Z/ W: C# f& K, @. q ;; it is to accelerate or decelerate
% U" N( L* Q* p. l8 Y* s0 r2 s phase ;; keeps track of the phase
- j$ s+ W/ b( n3 d num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure9 s9 l7 V# H& }4 W, i
current-light ;; the currently selected light3 a6 f6 x! E7 O3 s7 f0 p
! d5 u F7 g# y, ]5 e! N% R# D ;; patch agentsets
0 L+ {! x3 T( p0 i& ? intersections ;; agentset containing the patches that are intersections# N4 b. T- ~6 @, [3 L4 k
roads ;; agentset containing the patches that are roads
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turtles-own
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U |; C0 A$ r: ]( z speed ;; the speed of the turtle) Z& [1 h6 q8 Y% W& g1 |* p
up-car? ;; true if the turtle moves downwards and false if it moves to the right* m: p& R! W6 g+ V
wait-time ;; the amount of time since the last time a turtle has moved: g: ^3 K4 G) b: p: T
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! U- F3 K9 r9 q* |3 r" f1 D0 t: W0 Jpatches-own
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( A y6 b3 R# F2 J8 E intersection? ;; true if the patch is at the intersection of two roads8 p+ B0 B$ Q. J, I O
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
, Y( J `* C4 i1 o ;; false for a non-intersection patches.
3 K1 @ f: g6 Y# g2 ? my-row ;; the row of the intersection counting from the upper left corner of the1 Y |) U, a7 d1 I% T9 w
;; world. -1 for non-intersection patches.9 w% u* B+ v. ?/ T
my-column ;; the column of the intersection counting from the upper left corner of the8 s9 R! v; H/ x- }% i# @
;; world. -1 for non-intersection patches.' h! x- V6 Z6 }2 n2 u' D
my-phase ;; the phase for the intersection. -1 for non-intersection patches.2 S4 j8 L& T0 r. d
auto? ;; whether or not this intersection will switch automatically.
9 D0 A2 M' t% I0 D ;; false for non-intersection patches.0 O9 | o3 O" [
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;;;;;;;;;;;;;;;;;;;;;;4 O0 L! J9 K; H" b8 [# ~: f& S9 q
;; Setup Procedures ;;- A6 a+ ]. v z: ^) {
;;;;;;;;;;;;;;;;;;;;;;$ t8 R4 n5 w/ d+ L+ ]! @7 {* `
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;; Initialize the display by giving the global and patch variables initial values.1 b& ^/ l# v5 l8 E- ~) W8 w( Y$ I: w0 d
;; Create num-cars of turtles if there are enough road patches for one turtle to1 o' V% F _! k4 D: c/ E
;; be created per road patch. Set up the plots.8 l4 V. T- R7 J/ ]
to setup
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setup-globals4 n0 e! E5 p: Z# n; r- t2 Y! k
" S' i5 p3 s0 [ ?! V4 u ;; First we ask the patches to draw themselves and set up a few variables
4 W3 B4 J( W% M3 e" b4 n( `( ` setup-patches
# {7 v7 |2 x: l" Q make-current one-of intersections
) C: n. W* G1 W, s label-current
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0 e$ L: o: V M. w9 T4 a set-default-shape turtles "car"2 u( |9 R. {7 f. h) h1 E
$ ]6 Y( F) ?6 M, y4 `/ m if (num-cars > count roads)
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T/ J) M* S, {2 q& j" Q$ M, M* V, h user-message (word "There are too many cars for the amount of "
3 y- S' |0 Q9 J3 q- \# M: u "road. Either increase the amount of roads "
' B; r" B# }! f; r; m9 R "by increasing the GRID-SIZE-X or "* H1 C) p2 O( E7 I+ L% q
"GRID-SIZE-Y sliders, or decrease the "
# I c0 J2 B9 w, j2 v "number of cars by lowering the NUMBER slider.\n". P4 m" W) E) j1 `3 w
"The setup has stopped.")7 s6 O+ |9 y2 ^# U! I
stop
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$ a5 U, @$ G X$ u' j ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
: [& w! o6 d$ ~7 L4 e' x9 Z crt num-cars
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setup-cars1 x# e' m! V4 q1 b/ p* F
set-car-color$ ]: X( j9 f1 h; x, D/ T4 t
record-data" J: U3 Z: J/ X$ V& P
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; @- {2 ^7 p4 z5 ?' ~0 G a- }: E ;; give the turtles an initial speed* J; W' ?, m8 x& e3 Z9 o
ask turtles [ set-car-speed ]
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reset-ticks# T' Z1 u6 N" e. Q) U9 |/ y7 O# N
end
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0 z" N: w* F5 u' };; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
6 C7 `& o3 Z: v! C/ }4 S1 s8 U set phase 0: B: o0 o0 A8 L
set num-cars-stopped 0
+ E$ d9 \" t2 ]7 y9 b2 D: T# g set grid-x-inc world-width / grid-size-x% U2 m: ^; {* Z* g! A; T
set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary2 z0 ?* O: Q( |/ f
set acceleration 0.099
5 f. c) J8 @& W, qend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,1 P/ K8 V( x5 F# u; @6 i! w
;; and initialize the traffic lights to one setting
: N: P/ Q2 V( {+ G* _8 sto setup-patches( v+ n6 _7 y+ t
;; initialize the patch-owned variables and color the patches to a base-color
( u1 x$ U- t" N# m* P0 d6 ]- Q ask patches
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set intersection? false
L9 B a7 ^2 h& q6 t u set auto? false# |. t: `$ z# O: j' [" G$ G4 f
set green-light-up? true* F' a) N3 b( ~3 r
set my-row -1
& Z; f& ~4 o3 [! e- I set my-column -1
. \! j4 x6 @& A3 Q& X6 G set my-phase -1' v Z% m" k5 ]. `* j
set pcolor brown + 3$ V. T) e$ q3 T# J! R p2 T
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* ?8 ^8 n& [6 J1 A) g6 _ ;; initialize the global variables that hold patch agentsets! L3 m7 N8 h1 A
set roads patches with
5 ^! {$ o5 W' T/ r* d [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' |; |; I) J+ v( F0 R& z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 z z4 A) w' n& G set intersections roads with
8 \9 @' h8 G8 s8 q }0 q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
6 G/ r' F3 D0 I9 N6 i (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 i8 ]- N5 C8 l3 Z% I$ E' B
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ask roads [ set pcolor white ]* B! A( y% N2 @: v4 q( }# R* ~
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?
& l- L7 Y) X) b set roads patches with |0 t+ @& }5 S6 k! X
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 L9 o) K, a7 m1 N& I
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 A# J" S4 O7 v* i9 ^7 ]1 s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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