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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。
3 I8 B/ D8 D V$ ?; S2 _' \3 d! enetlogo自带的social science--traffic grid这一例子当中,% C" A- D1 c: M, i. L, w
globals) k) R2 R) B* W2 T1 o5 q
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0 F' ?; c6 l$ u9 F; C grid-x-inc ;; the amount of patches in between two roads in the x direction/ l/ B% s) C- g+ e; ?* v% C
grid-y-inc ;; the amount of patches in between two roads in the y direction |, d8 Q+ r! W1 W8 m$ D
acceleration ;; the constant that controls how much a car speeds up or slows down by if* n) u8 V# E# \# Z2 w3 D8 f6 Q
;; it is to accelerate or decelerate- e9 Y: g. ?& g* S: ]
phase ;; keeps track of the phase
5 e: [9 p: ~5 m& B4 ^; x* I num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
4 ~2 k4 ?( s8 r% c current-light ;; the currently selected light
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;; patch agentsets
6 C, q9 I6 z4 g/ L y M intersections ;; agentset containing the patches that are intersections
$ T/ [# }% y2 ^/ c' a: l) M roads ;; agentset containing the patches that are roads
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- d, Z- o# [$ w& Eturtles-own
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speed ;; the speed of the turtle+ O- X! |, U$ n; Q: C! o; ^
up-car? ;; true if the turtle moves downwards and false if it moves to the right5 A8 n5 C% j. e! N
wait-time ;; the amount of time since the last time a turtle has moved7 O- v8 f& f8 Q4 |+ s
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. F3 K- i% L& m* z* q* M3 E- M9 Apatches-own
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intersection? ;; true if the patch is at the intersection of two roads6 S/ ]3 G$ J G% c6 U
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
9 j6 K N0 }7 x6 Q/ \! o6 x- X ;; false for a non-intersection patches.6 }8 W K% P4 B4 C
my-row ;; the row of the intersection counting from the upper left corner of the
: ~1 ~4 a4 s1 n7 A ;; world. -1 for non-intersection patches.( e. N/ k9 a. n7 }, I
my-column ;; the column of the intersection counting from the upper left corner of the
% [# `- a5 z. ^) c$ W, ~ ;; world. -1 for non-intersection patches.
9 i7 q4 f$ H" H2 p0 G; c- Q: { my-phase ;; the phase for the intersection. -1 for non-intersection patches.6 C# L' y' L. M/ D; ^' d) D( ?: E
auto? ;; whether or not this intersection will switch automatically.
- |6 m. F1 H3 l ;; false for non-intersection patches.
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* ?" _, Q) ^2 _* ];;;;;;;;;;;;;;;;;;;;;;
5 n* O, g$ O4 B7 o' [;; Setup Procedures ;;! y1 M( l' G/ D. A5 q) X% c
;;;;;;;;;;;;;;;;;;;;;;
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F* C, g! w, t' i% k" v8 O4 w6 S: R;; Initialize the display by giving the global and patch variables initial values.
7 o* F+ B, x6 h$ o;; Create num-cars of turtles if there are enough road patches for one turtle to
" i0 b4 J7 z9 q: \& {' k;; be created per road patch. Set up the plots.
. ?+ w' ? g n( dto setup1 r! u# f& M, w1 k/ a
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setup-globals- {/ k/ r% r4 D$ m# J+ N
" H% q0 o6 U7 m" i; l9 g ;; First we ask the patches to draw themselves and set up a few variables
; q7 X, { i1 S( k setup-patches
* J0 U2 K5 {' {# K6 } make-current one-of intersections
- V) j: t; }# I" b5 c! p label-current
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set-default-shape turtles "car"
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* j9 v% \; j q8 _. ` if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
# z) W) ^, x. C4 x0 W2 g, f5 ] "road. Either increase the amount of roads ". |7 p2 S" g3 G3 W/ {5 b
"by increasing the GRID-SIZE-X or "" j; T) X& D& d& a% S2 ^4 Q
"GRID-SIZE-Y sliders, or decrease the "
1 o0 P5 R( j0 B- V; m) G, {8 t "number of cars by lowering the NUMBER slider.\n" A3 o6 C3 v" M ?3 O1 z5 M- o
"The setup has stopped.")
% W% W. ^0 h8 ]+ K* y$ _3 }: r& m0 @: o stop- ]5 G3 i1 G& ?7 P) ]5 |
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6 @: A% L- y: k( V9 }! ~ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
6 c3 X. U% j* v! t* v( u) X/ N crt num-cars1 z0 Z7 S9 f, g) ?, I6 m- L0 K" L
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1 M+ B' r- G2 I( t( u+ Y. _ setup-cars
4 v8 ]' E' {" R" G7 L set-car-color
8 E8 ~' W$ t* O @0 Z record-data
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;; give the turtles an initial speed
8 K; e, j( }2 @" Y& }7 X. _! o ask turtles [ set-car-speed ]. B+ F% b3 B6 }/ k) g9 o
. j5 |2 ?( Q& v v# `! n4 H reset-ticks# U9 b; A) {3 V% Y& a3 k2 O& K
end
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6 f+ m: T' h- G! u" V5 L: v8 E5 T;; Initialize the global variables to appropriate values6 H3 z3 O$ ]$ [" h% x" H9 \9 u6 P# z
to setup-globals5 n! j1 l* q: K6 P( t- L; @. z
set current-light nobody ;; just for now, since there are no lights yet
, X4 v& }. e( N5 g r set phase 0
9 \- R* J2 x# r% v A set num-cars-stopped 0" C3 m5 N. @ E( J
set grid-x-inc world-width / grid-size-x4 y, V5 }* L$ u$ P* Q4 I4 l
set grid-y-inc world-height / grid-size-y- }- y0 {* g$ C9 K$ P* o) _6 p( |) b
4 I9 \. P+ G( W ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
3 D* n* p0 E( y% b& ?7 g- g2 b* ]/ f% C set acceleration 0.099( l: C1 ^0 \4 Y* K- X) a8 y' w
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
8 M* I& ]$ x1 f5 X;; and initialize the traffic lights to one setting
) O) L6 p! D- V5 T8 u1 Oto setup-patches) A, r# e I$ P
;; initialize the patch-owned variables and color the patches to a base-color
( }& X2 ]; n& E) n* u ask patches
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set intersection? false0 n$ q2 ~) f, Q& H+ U) ?! f
set auto? false
1 A3 @) l0 r" z" ] set green-light-up? true
6 G& p6 _3 S: n8 o# I set my-row -14 j) m1 \8 \; o+ h9 u/ Y, q" f
set my-column -1
5 Q4 j4 D) h# S+ Y. B- a set my-phase -1) \0 z0 ~) `, u( n- U
set pcolor brown + 3" z0 q2 W+ @0 `4 ~1 w
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$ D/ N+ [# M7 T) a( x# r ;; initialize the global variables that hold patch agentsets9 c4 O) \; F3 K6 V' i: Z
set roads patches with
& @% f) _2 s2 V# M$ o [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( {' n+ j U% R. X7 P1 w
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]% d$ i, I; z- d; C4 |, c
set intersections roads with
, r# p. g0 x& w [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and9 P( @* y- O4 _ p1 ^7 d x
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]% {% ~3 `8 e' O" p
setup-intersections
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! r! u+ P: u5 v% \# \. |) n其中定义道路的句子,如下所示,是什么意思啊?8 | Q: o( T! c' O5 M
set roads patches with q) @, h1 a C. ]* \
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 x& f* b6 P/ \8 `- n
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" a" c' A4 S9 d4 B$ V! Y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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