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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。
$ o' ]$ V7 y8 ~; n9 s/ Unetlogo自带的social science--traffic grid这一例子当中,
+ J7 S3 H5 {/ x* ]# _' O2 V+ R* ]globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction8 S, J+ k" s! }7 F" t( T
grid-y-inc ;; the amount of patches in between two roads in the y direction9 B3 y7 c0 _! w% Q8 S
acceleration ;; the constant that controls how much a car speeds up or slows down by if
) Z" H; ]$ ^0 A; V$ y! W ;; it is to accelerate or decelerate. [9 M4 Y4 t7 |& D* E" e8 Y
phase ;; keeps track of the phase
- |# p4 p" |. n- J! H5 @ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure$ v. f4 n/ d! w/ o
current-light ;; the currently selected light
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8 H# T0 g! O2 d; u0 N" }! X ;; patch agentsets
! m$ m0 R: e c! _/ L- y" Z intersections ;; agentset containing the patches that are intersections. @0 R' t0 ~ p; N, ?
roads ;; agentset containing the patches that are roads- s) Q" F4 v) I! I* M4 n
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3 U2 i" H4 O S' Q+ mturtles-own
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speed ;; the speed of the turtle) N5 a7 j# @( _9 |( E! a
up-car? ;; true if the turtle moves downwards and false if it moves to the right% O- V- }/ A6 Q P) o6 ?, E
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads o$ b7 d: E8 x* S J$ D/ l( V6 U' V
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
" c+ }, m _2 H+ {: o; y/ V$ _ ;; false for a non-intersection patches.
" x0 k) k; g% t {; A. r) t3 I my-row ;; the row of the intersection counting from the upper left corner of the
6 f+ Y: q9 Z3 G ;; world. -1 for non-intersection patches.
7 v& I" l5 C% |( {. ] my-column ;; the column of the intersection counting from the upper left corner of the1 j1 p/ G8 \8 M
;; world. -1 for non-intersection patches.5 `% q- ]3 T; O, ?
my-phase ;; the phase for the intersection. -1 for non-intersection patches.! R* t( x# Q2 h8 S
auto? ;; whether or not this intersection will switch automatically.2 a- n! o8 i1 K
;; false for non-intersection patches.
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7 }8 n- r0 `+ ]! M$ O2 k' z' k2 {;;;;;;;;;;;;;;;;;;;;;;
7 G! e; a6 m% H1 m- h;; Setup Procedures ;;5 u- H& P1 x: M1 G* t# g9 k
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;; Initialize the display by giving the global and patch variables initial values.' F" X) U+ Z/ |$ p
;; Create num-cars of turtles if there are enough road patches for one turtle to
$ K, M& J z Z: ~9 r, y2 x' \;; be created per road patch. Set up the plots.
$ C2 s% ?4 `# Q& Xto setup
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setup-globals$ T' w" z; g5 P; q4 n$ q; r9 T
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;; First we ask the patches to draw themselves and set up a few variables1 m/ J3 a+ C7 s
setup-patches
: `4 T& l. @! C- t# ], I7 T3 {; t make-current one-of intersections. ~9 q8 S3 e7 l
label-current1 a/ ^/ ^8 m3 g# W8 m( ?3 P3 ?
9 O, ~: {+ k5 V2 h3 ~, B" @+ v* S set-default-shape turtles "car"
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' K; t" T9 F- M8 e' } if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
, y I0 H4 |* R0 N \9 x: ~* U "road. Either increase the amount of roads "
& t7 L! V* L3 E# c1 R, l "by increasing the GRID-SIZE-X or "
2 j: {* A$ ^3 ~1 D "GRID-SIZE-Y sliders, or decrease the "
4 m; s# N- K/ r& y# q3 l) f, j. i "number of cars by lowering the NUMBER slider.\n"$ w$ e( A- S+ G$ D. p
"The setup has stopped.")% n$ P( r# D/ W' g$ Q i( H& n3 |
stop, N5 q/ K& s2 S6 e) v6 B5 B- p0 w
]
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
- V2 j( Y" V. t! k* R2 c3 S crt num-cars
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3 m, g1 g9 Q7 I setup-cars
, x$ k; n' E1 x( { set-car-color0 v7 g j* D& O3 S
record-data& F0 g3 M7 W3 }, l2 R
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# j: \2 R6 e% K1 Y5 F( ` ;; give the turtles an initial speed2 U; {, Y! G3 N% Q
ask turtles [ set-car-speed ]
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reset-ticks
4 T8 [6 ^# i: mend
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;; Initialize the global variables to appropriate values- M6 v5 G- n1 t, z1 n$ I2 M
to setup-globals4 v2 q4 M5 V# N( W p6 O
set current-light nobody ;; just for now, since there are no lights yet! R- K2 ]7 j9 U4 X5 X( p7 F( U
set phase 09 d* P" I1 K# o- |3 z' ?: b# B
set num-cars-stopped 06 K* f6 ~* L* N }9 ]$ O
set grid-x-inc world-width / grid-size-x, e6 I, |( c# ~! C. k4 n
set grid-y-inc world-height / grid-size-y; @% ~5 m; }% {2 J6 O5 D
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary" y7 O0 D/ \! H' |# {; G
set acceleration 0.099; v$ \$ h: I' w: h/ L
end; {0 D" ^ I( S: {# l+ Z
, G7 s5 l9 j( B7 T- s;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
1 |) P" `, y( s. l;; and initialize the traffic lights to one setting. i6 y6 M% j5 _6 O% p
to setup-patches
8 k! K) Z" X. B: n- Y ;; initialize the patch-owned variables and color the patches to a base-color
" R2 l- _) E$ z! T, y8 _! M( a b1 j ask patches4 X9 {% _; R2 g1 A) z0 N. P
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set intersection? false
! f- }# x) t l+ t3 X0 R* w& D; e set auto? false$ z' d w# L) l5 Q0 U
set green-light-up? true
5 m* Y+ A2 G; s% Y J/ f8 f6 {' P B set my-row -1% B0 V$ t5 s& h4 u4 b5 s
set my-column -1
- o- D, I/ v. \. }( k set my-phase -1
1 h- ]: d# _5 ?' h/ Y7 {9 E set pcolor brown + 3
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) b% {* x% ~& B) a ;; initialize the global variables that hold patch agentsets
4 L+ M& b& D6 F# c2 T$ i set roads patches with
5 E9 @' k3 x2 X, V& r1 N [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
c* j8 W) G, u" a& r% | (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. n/ ^. b: c! }3 u* t5 K' f9 `* ~
set intersections roads with% x& V6 k" s5 Z4 U! e6 ^
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and) G& `9 ^, W3 X3 q2 C6 \
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]; n# b% Z, v8 I0 n0 }- u" ~. S
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ask roads [ set pcolor white ]
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其中定义道路的句子,如下所示,是什么意思啊?
" l3 Q# `0 a8 v! J' i. l set roads patches with! ?4 c! e& i" `- N. P2 _
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! I& ]1 t4 \. P (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 u$ `; E# }7 M- \3 j1 g5 |2 w. e
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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