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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。
' [* a: D: r4 m9 ~3 g8 Y cnetlogo自带的social science--traffic grid这一例子当中,
# u$ Q$ b! L$ ?- I4 o3 qglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
, F4 U9 A0 M; M# { grid-y-inc ;; the amount of patches in between two roads in the y direction
7 i9 m6 D3 t) C2 i4 g acceleration ;; the constant that controls how much a car speeds up or slows down by if7 O6 K0 Z5 s# K# a* r! o1 g
;; it is to accelerate or decelerate
+ H- H: r, v7 x. Z: @+ }0 z phase ;; keeps track of the phase! U$ B$ F! [0 Z* K! P
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure! M$ i p' ~0 v% X3 W: d
current-light ;; the currently selected light( p+ m+ V% O* T- V( ?0 A
+ C5 S; L% m" [! X ;; patch agentsets
$ ~$ B, X& h. D intersections ;; agentset containing the patches that are intersections, M9 ]0 N% z( [. N7 d5 [
roads ;; agentset containing the patches that are roads+ m- ~: s- t4 p- e: y
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$ I" u0 S/ k* r, j/ E1 y. b) _5 Rturtles-own
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speed ;; the speed of the turtle
* A* J. k6 @/ u7 n, M* Q up-car? ;; true if the turtle moves downwards and false if it moves to the right
K( o3 Z' ?& E4 L& u& | wait-time ;; the amount of time since the last time a turtle has moved
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# @& F/ p1 c; \" wpatches-own
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intersection? ;; true if the patch is at the intersection of two roads
1 ?; q% S1 Y2 q' w green-light-up? ;; true if the green light is above the intersection. otherwise, false.
4 w2 u5 Y% y5 {" V* Q3 x ;; false for a non-intersection patches.' L( y- v8 T# b5 r0 b5 z9 k4 o
my-row ;; the row of the intersection counting from the upper left corner of the8 w8 @/ Q6 c" }
;; world. -1 for non-intersection patches.
, C' U5 j$ S& B" e! l my-column ;; the column of the intersection counting from the upper left corner of the' i6 K7 U w$ g
;; world. -1 for non-intersection patches.2 Q1 e4 O7 ^; G; g t) t
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
9 d9 u) F" ^4 V; h2 n auto? ;; whether or not this intersection will switch automatically.
! X" T& ?% m j6 Z7 t ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;4 p8 H: [) q, F8 v% I) f) s
;; Setup Procedures ;;$ l) @$ A% @) ^. ]
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values./ l5 ]6 w8 y$ H2 E) J3 _5 f
;; Create num-cars of turtles if there are enough road patches for one turtle to
; E _+ ?8 ^( \1 s) A+ ]" p;; be created per road patch. Set up the plots.
+ ^% w* |/ \+ l2 j0 ]to setup
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0 D( `( i# L$ A" T setup-globals
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;; First we ask the patches to draw themselves and set up a few variables/ R. ]. |& `1 d$ X) z, V
setup-patches) N/ B1 n1 g' S3 A/ g7 d
make-current one-of intersections: v6 y# {+ O4 _. ]) i2 @' R( u$ G
label-current
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set-default-shape turtles "car") s i% r6 o' h' h
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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 "
( @/ c+ N& |8 r6 p6 P% F; S "road. Either increase the amount of roads "
8 j" p6 ]: q* u" j9 j3 m "by increasing the GRID-SIZE-X or "
4 E% \3 z/ k5 y/ v "GRID-SIZE-Y sliders, or decrease the "
& M! c8 `( T4 y# E$ N, Q: w; a# n "number of cars by lowering the NUMBER slider.\n"( X: {) g; Y7 t, L
"The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
( P/ D; @, k% {1 |: @$ m5 K crt num-cars
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setup-cars3 C3 p# J0 y- ~5 ^, X: ?1 V5 Y
set-car-color* E2 l: y: U! I$ F. a W
record-data
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;; give the turtles an initial speed! v6 R% y7 J# e0 l3 X9 p. a% z! [/ Y
ask turtles [ set-car-speed ], B. R$ J) r$ n
+ W( Y, ~# n0 e* n reset-ticks, o n' I7 _* c
end
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. T0 M' b- ?, B6 r% L# X;; Initialize the global variables to appropriate values
/ s% w6 n( \: U; F B( xto setup-globals$ L% E0 q/ z1 ?6 X. Z- z4 P% h
set current-light nobody ;; just for now, since there are no lights yet8 i. w* g5 ^: V3 |
set phase 01 g6 j0 e# _+ U9 K8 F+ N& M
set num-cars-stopped 05 v! Y/ q7 D. l. B* J9 M2 J4 V* I
set grid-x-inc world-width / grid-size-x2 S9 O) l& p' b& t/ ^3 s
set grid-y-inc world-height / grid-size-y1 Q* P: @# ]; K9 y0 ?' M
/ p! {, s6 B. N H0 x; n; g7 X: n0 W- ? ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
( c- D0 ^+ t/ o& ~8 k! Y- D; F set acceleration 0.099
- L9 H" O8 _) A% B% K d9 h2 tend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,$ ^% g( u9 V' w0 g
;; and initialize the traffic lights to one setting
& y3 w8 I n* Y, a& {! ?1 t8 Fto setup-patches
1 w8 Y* o. c/ x/ w/ ^8 S- y ;; initialize the patch-owned variables and color the patches to a base-color. X/ P# z; l3 D2 c: O( u0 z6 n
ask patches
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. v: L6 [, f6 n set intersection? false
4 T1 x1 t4 l0 v$ U( A! ~; p set auto? false
7 k- w) |3 |. H' i, S( H: @ set green-light-up? true) b! B# @5 C4 b+ t; s
set my-row -1" S$ A$ y5 r0 d" ^4 G& U$ S
set my-column -1
1 z, q# X4 R# X* S( N set my-phase -1
+ k5 r4 H- h1 h- ^7 C, p- j set pcolor brown + 3& M" o; |# p9 I3 k: [
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;; initialize the global variables that hold patch agentsets( D1 F8 m h0 ^
set roads patches with6 s( u0 E; x* |! V* X) x6 {
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- D/ j. N7 F q9 o( m
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 M3 M3 a$ x9 r# z% }6 f' b
set intersections roads with
3 T3 M7 j2 D/ R7 s% F3 _0 [ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
! T0 v+ H9 d8 W8 z$ \( \ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- B, w8 J/ b/ f. b* p
) Y+ J2 y7 G7 K! I ask roads [ set pcolor white ]$ f) U' }1 s9 j1 [8 j. Q
setup-intersections
( u+ v; j- e7 L3 d$ z& ~" wend
- D( l9 _. \, u其中定义道路的句子,如下所示,是什么意思啊?) |- I* U! R* g% J2 S5 F5 s
set roads patches with
3 L6 o8 K$ y8 e% y. _. @" l7 g [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ d6 u0 b: }5 P; |5 v3 T5 w
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% T0 b: \ `% u; W, X6 {8 i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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