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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。
# b# W, d4 g4 z" a, enetlogo自带的social science--traffic grid这一例子当中,
5 x6 F6 c( U6 O9 hglobals
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; P: G3 [2 [* d+ j grid-x-inc ;; the amount of patches in between two roads in the x direction
5 O2 E9 j; u4 o5 Q grid-y-inc ;; the amount of patches in between two roads in the y direction2 h/ T* a# P# K) R3 S1 D" m
acceleration ;; the constant that controls how much a car speeds up or slows down by if
! d) Q+ y2 R0 T1 N ;; it is to accelerate or decelerate
4 g8 W+ X0 M8 ]0 }' O+ u phase ;; keeps track of the phase- n: j3 x: q8 ~! w8 a
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure5 J2 w3 @# I. o, M% ?
current-light ;; the currently selected light {8 \, l6 Y% y4 n) J
9 j3 A( H0 b$ } ;; patch agentsets) u$ ?" [7 g' g
intersections ;; agentset containing the patches that are intersections
- D" A. ~# z, B3 i5 {8 z3 m1 a roads ;; agentset containing the patches that are roads$ B2 Z2 z- t* e( s
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turtles-own
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speed ;; the speed of the turtle
' K9 _4 x. P0 U F ^; W up-car? ;; true if the turtle moves downwards and false if it moves to the right
+ y* C" s B! O( r) N wait-time ;; the amount of time since the last time a turtle has moved
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5 G* d& I" T S# O D; w1 G8 v$ Z5 _patches-own, }) Y4 f6 J9 l( n) N9 T
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T* q' I. B$ u3 f/ o intersection? ;; true if the patch is at the intersection of two roads i$ N) S9 e# n
green-light-up? ;; true if the green light is above the intersection. otherwise, false." P5 [0 A/ X# L0 L) W+ ]( G
;; false for a non-intersection patches.
9 Y, ]6 o+ L* Z/ S: M7 x my-row ;; the row of the intersection counting from the upper left corner of the/ `: k5 c) B c4 k( n
;; world. -1 for non-intersection patches.! h! x$ H% _2 \9 Y7 I0 ]
my-column ;; the column of the intersection counting from the upper left corner of the
" N: b2 Y* P& o ;; world. -1 for non-intersection patches.5 S3 ?$ \; S3 E* o+ O. p5 h6 w
my-phase ;; the phase for the intersection. -1 for non-intersection patches.4 g4 R O( k) ?8 [) }$ W( B
auto? ;; whether or not this intersection will switch automatically.
) l6 ^9 l$ k% ^+ T k% q ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
- [. u4 M/ q9 d+ H5 m% w) @;; Setup Procedures ;;
' ?' Y, }& p! `;;;;;;;;;;;;;;;;;;;;;;
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0 Y0 y( B$ F+ \- Y7 A;; Initialize the display by giving the global and patch variables initial values.
3 y" d. t# T5 I- ~9 o! X) u;; Create num-cars of turtles if there are enough road patches for one turtle to. n+ o5 R8 l5 N) s& n# c! D+ q! s |
;; be created per road patch. Set up the plots.
" E3 {6 V/ m; l, \to setup
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables2 j! t& p, e7 a2 V/ \# d7 O0 t
setup-patches7 r! J' o3 a1 |+ N
make-current one-of intersections1 {! y; I) b( O3 Z
label-current
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3 T% `7 k, l1 \! e# F6 Q set-default-shape turtles "car"
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "- N. j1 ?, j: \1 j
"road. Either increase the amount of roads "; c; Q" G6 F' {& M& z
"by increasing the GRID-SIZE-X or "6 R8 l" \# _. t" [, P
"GRID-SIZE-Y sliders, or decrease the "
. W" t+ r# z. p+ W9 D4 f8 @ "number of cars by lowering the NUMBER slider.\n"( U: Q$ j& {! M' m& I$ O: I- G( U
"The setup has stopped."). {8 @0 _+ s% V
stop# n2 T. C$ p9 E+ E3 Y
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7 o* O- q2 [* k! p9 _0 f4 H ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color7 u* h4 j/ @9 W( e8 r' K" A8 Q6 I
crt num-cars
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% f# u# j& d# [" G; X7 u setup-cars
( l1 }9 S" r- B% P' m% f set-car-color2 W6 T n" y& x' G/ |& O1 C
record-data4 r2 R0 c( G" o: y. e
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4 E6 F- _3 r. F4 D0 a ;; give the turtles an initial speed" b5 i9 r: m' L5 I9 J& X
ask turtles [ set-car-speed ]6 J" [/ b9 j, p" @
! j! R2 h( J" c8 F! }$ U- ^ reset-ticks
a/ l2 a6 R f) @1 k6 F7 Iend
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;; Initialize the global variables to appropriate values
- g/ A+ J0 t5 W% m7 ?& c; c, A1 ~to setup-globals( q. R9 p$ l1 E: Z" M$ o
set current-light nobody ;; just for now, since there are no lights yet
3 T+ L& `" ~5 X6 J set phase 00 D- t. x! ~& x; O
set num-cars-stopped 0
8 x+ u4 r5 v" C7 @) ] set grid-x-inc world-width / grid-size-x
2 i( {/ A' X- d6 j4 p# Q 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 boundary
* W! Q) a# p! K set acceleration 0.099
: ~7 }/ G- X" B9 v" m) w5 J- zend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,( P. q1 I5 _# e' ?) I; O: i+ s$ T
;; and initialize the traffic lights to one setting
. V" f0 \) M: H0 Q5 Yto setup-patches
4 j, X( C o0 r2 \4 m& \3 F' z ;; initialize the patch-owned variables and color the patches to a base-color/ F8 _) `3 y3 l4 Y2 J- x) D) p
ask patches0 N3 a) H. x3 o; b1 S% k- d9 [
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M1 W3 Q, m$ _8 R set intersection? false- o4 U; n1 z6 a* ]$ w4 o
set auto? false
1 V) x4 s: a" c" p: \ set green-light-up? true
0 S$ n( m+ y" F& Y set my-row -1
1 [; G$ w5 A" h p7 |( p set my-column -1
% D) v2 D0 z/ R/ _ set my-phase -1
5 H3 u; T: U2 O set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
/ z( h; ~: o% N& M# c set roads patches with
W/ [* c8 R' y. x# V2 _ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
( r: O4 w7 O2 y" Q9 _ X (floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ L9 a7 c7 H9 ]6 t. A
set intersections roads with
8 p: ?$ H3 L# w- X) P, c [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
# I( ]* L" L" \1 x, V* a/ G (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]$ A& ~7 P. \+ M- Q
setup-intersections
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# l, k" i1 V* d6 f其中定义道路的句子,如下所示,是什么意思啊?
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[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ p' S0 c7 F. P1 O& y+ v0 @5 q
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) I# i5 ]1 e" O) a" j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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