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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。
; _" V0 G% V! ^3 ~% e1 C" B% t8 \. hnetlogo自带的social science--traffic grid这一例子当中,2 A+ K% o& }& n. L7 I& Y% e4 i) J
globals8 W! D- G# C+ R/ G* E+ E: D# \+ N
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1 v* l1 b) n; \( b" Z grid-x-inc ;; the amount of patches in between two roads in the x direction
8 S+ Q- R* J, _- X, B2 i grid-y-inc ;; the amount of patches in between two roads in the y direction
d+ F/ \8 e" n& x u- _9 I acceleration ;; the constant that controls how much a car speeds up or slows down by if
! I' |( b$ J$ X0 D! m) W. d ;; it is to accelerate or decelerate4 w3 M% u9 C. R& m, e
phase ;; keeps track of the phase
4 b; f. z$ g, I) ~+ \! q- D num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
4 [1 X$ f$ c4 o& Z# y% l current-light ;; the currently selected light0 f: a) B: o: l5 W! N
" K. a) s1 B' U* D R' [ ;; patch agentsets
& ?& F) V& d8 H: u intersections ;; agentset containing the patches that are intersections
4 W3 f; a% @" T- ~5 p3 ` roads ;; agentset containing the patches that are roads! c& a& @& c" Q4 y# f8 ?
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5 ^, @0 t# a4 b( cturtles-own! E0 _" Z" M5 t$ j. H. Q
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" n \% r9 ^( a/ s, L0 r speed ;; the speed of the turtle' B" v+ Y9 b3 f3 j
up-car? ;; true if the turtle moves downwards and false if it moves to the right
; w& t8 y, n) }' _; \ wait-time ;; the amount of time since the last time a turtle has moved
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3 Q, V# w0 K, \patches-own
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intersection? ;; true if the patch is at the intersection of two roads
5 Z$ C: X( W5 O green-light-up? ;; true if the green light is above the intersection. otherwise, false.& |; O7 s. t: }9 U! ~- U
;; false for a non-intersection patches.
8 N! [5 w: l, L7 Q, D my-row ;; the row of the intersection counting from the upper left corner of the
% W& }2 t1 a7 |0 y4 L$ }' @ ;; world. -1 for non-intersection patches.' h! K( R4 \+ V/ J
my-column ;; the column of the intersection counting from the upper left corner of the I6 e1 g; a$ \0 K/ h8 d
;; world. -1 for non-intersection patches.
2 U% F* s4 m% O, u my-phase ;; the phase for the intersection. -1 for non-intersection patches.
2 |' H# W3 n5 N auto? ;; whether or not this intersection will switch automatically.& S, H2 V& o4 H
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;+ G- K" v& ]% {) i N2 I6 ]
;; Setup Procedures ;;: M& }$ ~6 v" _4 E% n& G
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
7 @, |4 K# E4 ~4 w };; Create num-cars of turtles if there are enough road patches for one turtle to/ B8 o5 S) h* J8 a' `
;; be created per road patch. Set up the plots.
. I. e" }& ?6 U+ w* Jto setup" f0 F1 K. R+ V
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setup-globals
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& Z) w+ |3 q/ v# z ;; First we ask the patches to draw themselves and set up a few variables; Y$ N2 l* j1 u/ |
setup-patches1 s5 D4 j" d: a- o6 ^8 F& ]
make-current one-of intersections
9 z1 C# |! K( S% k label-current0 Y' S$ j6 s' C2 P3 Q N3 Y( p4 \
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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 "
) h& D: C4 ? L/ v "road. Either increase the amount of roads "7 H: S! p& D: y, U1 w" X" U/ f
"by increasing the GRID-SIZE-X or "
4 H+ b5 _+ j) Y+ `. r# l7 ^0 t" S7 | "GRID-SIZE-Y sliders, or decrease the "
- ~" S! @* W n "number of cars by lowering the NUMBER slider.\n"
6 e5 D# E7 W, d( V% o "The setup has stopped.")8 G+ S+ g* h q' v$ I. O
stop9 ^5 r) E3 V6 W; |4 M' |! D- k
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
) @2 ?! x, F. {0 k, ] crt num-cars
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) s+ W2 u( B2 O$ T5 w setup-cars
4 i& b, z l. f' o, x r set-car-color4 j" p" P9 }. N! K: m
record-data
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;; give the turtles an initial speed
3 Y: f$ `0 l5 [ ask turtles [ set-car-speed ]- h! {) S5 i5 u, k
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reset-ticks X6 n* Y4 D7 Z+ b2 x
end- l. a5 z5 X+ J; I: ?
2 R A: n# b7 H5 X2 H8 a6 J- I;; Initialize the global variables to appropriate values
, ]% @' l8 I7 W/ H- d F5 ], `to setup-globals; i1 l( P4 j, X, r
set current-light nobody ;; just for now, since there are no lights yet
; D3 Y6 x0 b @ d/ I2 v o4 L set phase 0
+ e, f0 }6 ~6 G0 Q# B1 ~; B0 I- Z/ \ set num-cars-stopped 0
1 @* f6 N( N' s% R2 S set grid-x-inc world-width / grid-size-x+ u' o$ b6 E; M) d/ g" |
set grid-y-inc world-height / grid-size-y. @ C4 U0 H/ I$ A# 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
2 ?% G/ |0 h" h, G set acceleration 0.099) v, u$ s4 r. n$ s" ` s8 G
end
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& D4 A9 F: c. [( g$ \;; Make the patches have appropriate colors, set up the roads and intersections agentsets,! ]& f. w I$ q5 V) {, D2 y
;; and initialize the traffic lights to one setting: {8 g+ o* M! o; f1 E
to setup-patches. a# U; |3 E: O' h# k: d& A5 X. H3 N
;; initialize the patch-owned variables and color the patches to a base-color
4 S: Z: t7 y0 t ask patches
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set intersection? false
, I0 b1 u6 `: B( F set auto? false
- d0 A4 ~" i( N8 F& a set green-light-up? true, n6 |7 }" x, Q7 N
set my-row -17 r' Q7 e }2 k; I4 A7 r4 k% V4 Y
set my-column -11 O& K7 M! E7 J( V* V1 `
set my-phase -18 N b4 j M c4 c4 M
set pcolor brown + 3) [1 o+ s# I; P
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;; initialize the global variables that hold patch agentsets
U& K: b0 r1 l: B$ v9 P: F% q7 c7 e& B set roads patches with
( y1 O" h" u5 H0 E; U8 k7 | [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, |2 n4 I' ^5 S: `7 J2 @8 ? (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 Y& ^6 e- h8 M! V set intersections roads with
; W/ w; P+ o$ r2 M$ Z. }. g" R [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and1 n p, k. l: k! V: H2 v& H% {$ q
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
, J1 h6 p* A+ W; D1 m setup-intersections
3 J' f% ^. D3 c1 t9 [end
8 f" Q3 I( P% u% K2 I2 A其中定义道路的句子,如下所示,是什么意思啊?$ ]4 B7 b. ?( G2 l7 y+ L
set roads patches with. Z1 f, b$ W! N; A3 _" m6 T
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 f3 `$ j! D5 C F" s+ O: ~3 K
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 f! z" _5 O* Q3 m" H
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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