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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。
$ x3 P- ]3 B( u3 g5 _7 ]4 }netlogo自带的social science--traffic grid这一例子当中,6 b# L# T- y3 X- _9 @% g) ?" F4 H
globals( G j1 J6 y O( m' n% H# x# g
[
, L- @8 c3 @. [: e* C# u" l5 T# ?- u grid-x-inc ;; the amount of patches in between two roads in the x direction2 D! L- `& N( y) \+ F
grid-y-inc ;; the amount of patches in between two roads in the y direction% S, e# C! q; }* P) \5 B& {
acceleration ;; the constant that controls how much a car speeds up or slows down by if
7 h/ N$ D& I; M6 a ;; it is to accelerate or decelerate+ q$ Q6 o5 H3 v* ?' h, y: u( h( v
phase ;; keeps track of the phase" T1 G: z5 a7 P+ a& ` B
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure! v8 _& K: U9 q
current-light ;; the currently selected light. @- w6 _7 o- m6 w9 h
7 g, W/ L2 W( L& _ ;; patch agentsets
( k3 {2 u% ~8 N0 l. Y intersections ;; agentset containing the patches that are intersections
, N. P! J4 F9 R. f- V3 b roads ;; agentset containing the patches that are roads
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/ Q# b& G/ M* g( ?4 O$ Yturtles-own
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8 @% c! R/ M4 p. M& A, k% Q' P- m speed ;; the speed of the turtle! p6 j/ m d# h! k# o
up-car? ;; true if the turtle moves downwards and false if it moves to the right8 g* U# y' R/ ^4 r8 M
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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, E! S# S3 C3 T9 G intersection? ;; true if the patch is at the intersection of two roads3 y) L$ z' L4 R' e5 n* t
green-light-up? ;; true if the green light is above the intersection. otherwise, false.2 I; K. E: k0 i
;; false for a non-intersection patches.
8 N5 `# t: M/ r0 L" t) k) o my-row ;; the row of the intersection counting from the upper left corner of the
4 T6 m$ s' r& y" \" b! W" d ;; world. -1 for non-intersection patches.
7 _) r) S% e/ R' z3 T, m my-column ;; the column of the intersection counting from the upper left corner of the ?' q9 L9 n) Y4 I6 w8 m7 G% m
;; world. -1 for non-intersection patches.
; b! B7 ^! }( y7 B) t E, O my-phase ;; the phase for the intersection. -1 for non-intersection patches.& M) }( ?) H/ v! z* M( A) U
auto? ;; whether or not this intersection will switch automatically.
0 o h& G l4 k ;; false for non-intersection patches.
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6 X3 M" R3 `+ l8 };;;;;;;;;;;;;;;;;;;;;;
( h( m) t" l% U. {3 D;; Setup Procedures ;;7 q4 v0 m" S/ d5 @% k/ u- L4 r7 f$ D1 P
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.7 A, y! j! g* ?3 ]' M6 M
;; Create num-cars of turtles if there are enough road patches for one turtle to
5 {+ Q& B: I) K2 S% F: ~/ T/ k2 ?" s;; be created per road patch. Set up the plots.4 o& t8 A `3 V: B2 H7 e
to setup2 O1 @5 ? v' V; |6 E# l( O0 o; [
ca
# y* V9 b" Y( O( }- Z setup-globals4 s$ Z) j: v: v0 y) A
2 c9 Q- i; @% U/ U1 ?, T" F5 X ;; First we ask the patches to draw themselves and set up a few variables
& `) c. @; L, }* C S) s setup-patches# }# l- F6 n* L" d3 C5 u! _
make-current one-of intersections+ Q @4 o& F9 K1 D1 s
label-current
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set-default-shape turtles "car"9 ~# z3 P. I' }* j e- r
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if (num-cars > count roads)
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+ ^0 D- ]' A3 j) W3 v( b user-message (word "There are too many cars for the amount of "
) m) x6 c8 A5 m) q "road. Either increase the amount of roads "
, f, K( K1 s- _# E "by increasing the GRID-SIZE-X or "# b2 F+ r/ g9 T" x4 r+ n( ~
"GRID-SIZE-Y sliders, or decrease the "% L7 ?, i# ~0 ]/ c" j+ @1 M9 A9 Q
"number of cars by lowering the NUMBER slider.\n"
; G m2 _* P& Z) ] "The setup has stopped.")
. T' d( W, z$ |9 K# u/ u stop0 I( l% Q& P* e: N* r1 g6 ]; f3 P
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color q& L( e& ^ ^7 `0 d
crt num-cars
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setup-cars
# w6 l8 Z$ U5 V5 t" Q set-car-color1 o+ X& A5 G: M1 [' I
record-data
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|, q. L, H C9 @3 x ;; give the turtles an initial speed( B7 Z! a- ^+ t1 P L5 \9 k
ask turtles [ set-car-speed ]. C" Q6 @- f( W& O! i0 S6 Z
5 v0 I; J/ p* c# Y% F* G P reset-ticks
; u8 `7 ]% P0 W6 }end
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) _$ O: A" F* [& v1 V& @;; Initialize the global variables to appropriate values' S% z' ~0 D, a V- r; X
to setup-globals
: l% U0 f9 g9 z! ?* u set current-light nobody ;; just for now, since there are no lights yet
# L# ~7 _$ G- z2 N. o5 B set phase 0. \, ]9 Q. G# c& e7 _' k. c9 k
set num-cars-stopped 08 V- ~9 X" ]9 ^. Y. v! g6 [# v" y4 I) a
set grid-x-inc world-width / grid-size-x
. d& o$ s" N& n4 l* b. U set grid-y-inc world-height / grid-size-y- x& ^3 q/ W4 }3 J
$ T# G* }* Q3 }6 C1 e' k5 _: s3 w ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
3 |# R2 n) i& c& x+ n2 [ `# d set acceleration 0.099
a) H L$ N2 Q+ k! t8 R- L$ `5 l9 Iend- v5 P! p- X+ J z2 U% _. l
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,9 E7 W) f" X9 d. W/ I
;; and initialize the traffic lights to one setting6 s( a. h- Y! X- |
to setup-patches
7 w$ u" H3 x* Y ;; initialize the patch-owned variables and color the patches to a base-color
) P( q3 |0 U0 P2 H/ T1 z ask patches
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" V* B4 ] H8 D0 K# [" q0 C! m set intersection? false
: O! Q; j* _3 M( F set auto? false5 P" k% e( g |- A
set green-light-up? true
1 a5 Y" w" n2 ^; t1 R- s$ z4 G5 ` set my-row -1' P; \! i: q4 ~- J8 U0 {; U
set my-column -10 S8 v% q/ v/ T E9 A1 a
set my-phase -1
' `: K% e* K6 a( H( }7 C; ~" F set pcolor brown + 34 ]& @: ?8 m+ `" `* Z
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;; initialize the global variables that hold patch agentsets
9 T) f: o/ Y9 D set roads patches with
. H9 Y2 M+ B" L6 Q0 r R4 } [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- K" l2 A' @- R. l7 R, f! \ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, ~+ n* F, a y4 v7 g set intersections roads with
3 u9 F5 P( T; J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and0 G& u: j/ T6 D/ T9 N0 d8 b
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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' k- Z# u# Q6 `' V% t" ` ask roads [ set pcolor white ]; l0 K; x3 M7 ]
setup-intersections
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" S+ M) M& [& t* Q其中定义道路的句子,如下所示,是什么意思啊?
! o+ y! C. T1 Y6 ~/ v set roads patches with$ a; d: p) z3 v0 p1 x/ V
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ h s9 p/ B9 w, J
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 S2 M. Y9 B S) r8 |6 p, S& o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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