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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。
4 |" e! T# H {netlogo自带的social science--traffic grid这一例子当中,
. _9 u# _1 l/ m y( a- oglobals
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+ h/ Y( j# J" u grid-x-inc ;; the amount of patches in between two roads in the x direction: {3 v% W4 e" l
grid-y-inc ;; the amount of patches in between two roads in the y direction$ k$ v& J4 V; O) T' Y4 I
acceleration ;; the constant that controls how much a car speeds up or slows down by if* x* I8 }! N5 m' r4 }3 Q
;; it is to accelerate or decelerate! f6 x6 t; |+ c( U. ~
phase ;; keeps track of the phase
3 l6 X9 X9 u8 p# i9 X( u1 _ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
" p7 ]( f* P$ h/ a* K9 F current-light ;; the currently selected light
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;; patch agentsets4 G5 d: H P5 H' L
intersections ;; agentset containing the patches that are intersections
, Q2 K8 t7 [: h' L roads ;; agentset containing the patches that are roads/ q9 Q1 R/ B8 O0 s
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1 w9 b3 O1 }: Mturtles-own4 |9 B' d, n9 @ o. a
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# t1 U6 H' {2 J8 y1 ~ speed ;; the speed of the turtle
1 X3 Z7 ` r( I4 ` up-car? ;; true if the turtle moves downwards and false if it moves to the right% T Z$ r" z( X
wait-time ;; the amount of time since the last time a turtle has moved* s* Y1 u! J) V* F |9 L
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads
: h) |" [6 G) L# E" o. q green-light-up? ;; true if the green light is above the intersection. otherwise, false.9 |( }: |6 R% W' ?
;; false for a non-intersection patches.
: ~! p2 J7 r ~5 B1 s; V my-row ;; the row of the intersection counting from the upper left corner of the
$ J) f, k; W! o+ v ;; world. -1 for non-intersection patches.
2 }2 F& N0 B8 o my-column ;; the column of the intersection counting from the upper left corner of the
3 }* D! T% d E4 O- M ;; world. -1 for non-intersection patches.
3 |* @; a% D0 ]8 e: U my-phase ;; the phase for the intersection. -1 for non-intersection patches.: K8 M& r8 }; y% `; u7 }
auto? ;; whether or not this intersection will switch automatically.: F( g( B. z2 U9 e* l* W/ k
;; false for non-intersection patches.5 a. G& _+ |3 H; J+ h
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+ l. l: `7 D# c6 [8 ], \. a' Z. h) `;;;;;;;;;;;;;;;;;;;;;;- w- I4 k3 G5 K8 c
;; Setup Procedures ;;
7 A7 ^' {% n! l: K! g;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
& _4 _! A6 l' _1 G3 e% g( A" M6 l# M;; Create num-cars of turtles if there are enough road patches for one turtle to+ L0 g; u% x l, u1 H4 G# y
;; be created per road patch. Set up the plots., }! F+ V# {3 `8 a1 B
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 variables
) _# j) f8 `4 [ setup-patches
# A2 A+ z% ]" c make-current one-of intersections) A0 U! i1 U0 K' U3 n3 Z
label-current$ v6 b- Y& _& G4 r7 v
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set-default-shape turtles "car"
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if (num-cars > count roads)1 g/ L# t, `4 C
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: p( X0 _8 i7 M9 ?1 y5 T6 x user-message (word "There are too many cars for the amount of "
( J4 P; T d. \) S" v "road. Either increase the amount of roads "
# c: v# ?$ I' s# u( z3 Q6 m( A "by increasing the GRID-SIZE-X or "- h ~7 ~$ L0 y, ]/ X: O
"GRID-SIZE-Y sliders, or decrease the "
8 y4 S+ M# w- a* a9 J9 d "number of cars by lowering the NUMBER slider.\n"
I6 W' A! G$ Z0 J+ I- W "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! L: T: X% f3 y+ w5 |
crt num-cars
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setup-cars
0 |) q0 b7 B. J: s. [5 s, p( Y set-car-color! h$ K' [5 H' ]
record-data
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+ @2 \) d0 v' T8 _; j2 A% K. z ;; give the turtles an initial speed7 @3 q5 q+ |$ p
ask turtles [ set-car-speed ]9 w9 @5 Q( {$ l/ m$ V! ^ f5 R. j6 [
$ ]# s: B; `/ L( \9 l reset-ticks
+ b* S7 m3 H' z: p7 K0 P4 Fend# P. |. k$ b- R; c% [2 E. f5 f
7 \7 h# C' F9 B- h# A3 T;; Initialize the global variables to appropriate values
1 {9 S+ _$ }/ zto setup-globals0 U$ Y* W; A9 O) z% o3 L
set current-light nobody ;; just for now, since there are no lights yet, v+ b, I5 C( Y( t; K. b
set phase 0
+ r( j( F3 j, J set num-cars-stopped 0; x8 q4 H4 Y0 f2 G; h) e+ P$ ?
set grid-x-inc world-width / grid-size-x
0 j% U4 N ^) V6 `! m set grid-y-inc world-height / grid-size-y7 l: y3 l4 |/ n" I) h* i/ g
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
, c0 N9 d6 u( s# w* L9 n set acceleration 0.099$ ]! Q% a/ B9 S5 ^8 D& s
end
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' }' W4 O- C7 k6 b;; Make the patches have appropriate colors, set up the roads and intersections agentsets,) C( u! c- D9 b( ]
;; and initialize the traffic lights to one setting
) h8 v, c; I' {" C2 a' m0 i! Cto setup-patches
/ j" q1 A: z3 F ;; initialize the patch-owned variables and color the patches to a base-color
% p6 N1 d9 Q( ]' r ask patches
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+ L1 d' |+ e6 c4 Y0 u3 E set intersection? false
& }* S5 V& @9 x set auto? false, e. @! R! B% l9 R9 x
set green-light-up? true
& U1 ~# t$ ?+ n% b4 R set my-row -16 |3 I+ C+ x3 L, I$ i" `
set my-column -18 h2 P9 s) n8 v! \9 o
set my-phase -1
& k. Q$ {" `1 c- c# d set pcolor brown + 38 i2 o3 {5 c0 o/ S7 o o ?
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;; initialize the global variables that hold patch agentsets
; ~6 n0 _" v2 i) `+ a7 I, } set roads patches with2 L; p$ G( H. \& ^
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& g/ s( r, i/ G (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 I2 [4 J. x! t8 y
set intersections roads with
% r' | j# N$ }/ R [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and! f# b! T6 ]0 n% [
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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$ z- p; x5 I) q- `2 y# c ask roads [ set pcolor white ] I9 z' W) `2 x0 V) u. v0 v
setup-intersections
3 Q8 ?5 ^- Y }0 [/ h: mend
+ c# w/ u3 w3 w- F( p! m# n& ?; w其中定义道路的句子,如下所示,是什么意思啊?3 U! h* g# g$ A
set roads patches with
0 F3 t7 n' W& ?1 R! `5 w+ ~ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: W5 a) h- I/ G6 I6 [) @ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 ^1 x1 t5 t2 Y9 Y$ |0 T8 z: n, n
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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