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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。
% S6 x8 J# [ y2 [1 ~netlogo自带的social science--traffic grid这一例子当中,+ S! r. }% G: c% _+ t- G3 r: {
globals! Y' h$ f6 V! z6 S: }0 G
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grid-x-inc ;; the amount of patches in between two roads in the x direction
$ S9 ]' O" S4 W' r2 s/ w [ grid-y-inc ;; the amount of patches in between two roads in the y direction
* a4 G# D7 J+ O, p acceleration ;; the constant that controls how much a car speeds up or slows down by if/ s; X U+ I0 \; D& L, a
;; it is to accelerate or decelerate3 R" h4 X$ p; o: m. T
phase ;; keeps track of the phase5 G3 K4 B1 \- A2 ?- z& a
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
) E4 \3 l5 X( A current-light ;; the currently selected light1 I: z0 z& Q% K+ q1 P' O
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;; patch agentsets
0 ?+ P* E' Y. s/ q8 {) M# [ intersections ;; agentset containing the patches that are intersections
/ R% N; o8 i v- g& S0 K) n0 }; _ roads ;; agentset containing the patches that are roads
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turtles-own
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+ F1 u4 y1 u, y3 L4 C speed ;; the speed of the turtle
" [, ^0 k% _8 |' d9 @ up-car? ;; true if the turtle moves downwards and false if it moves to the right
# C; w# P H9 x$ r/ j9 U# I" v wait-time ;; the amount of time since the last time a turtle has moved: t Q" J' n) X' v8 u* t8 E! F
]
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0 a- T, W7 Q2 K8 j' A- Fpatches-own7 G2 u' `3 S0 ?: _, I% v |8 t5 y0 u
[
: R/ U0 l2 {$ Q, @; N9 l intersection? ;; true if the patch is at the intersection of two roads
9 P+ F( C& m* B green-light-up? ;; true if the green light is above the intersection. otherwise, false./ z7 y' X: X& L7 _
;; false for a non-intersection patches.2 G! g& t0 E# R3 R. J
my-row ;; the row of the intersection counting from the upper left corner of the0 g* H3 {- l, ~$ L5 r
;; world. -1 for non-intersection patches.
; T/ U' n0 P- s" y) D* s my-column ;; the column of the intersection counting from the upper left corner of the
8 f/ U; u5 t% T6 |/ Y ;; world. -1 for non-intersection patches.5 A4 s! ~# A l! d
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
6 W T c v8 a$ C auto? ;; whether or not this intersection will switch automatically.+ Q4 x8 u" x {. _& p! F1 s
;; false for non-intersection patches.0 ]: {4 E- ~6 v0 o# e
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% v9 ~ W2 J! \;;;;;;;;;;;;;;;;;;;;;;5 t8 _; h0 M @0 n3 x
;; Setup Procedures ;;
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) F$ R8 n$ `- l8 `0 H;; Initialize the display by giving the global and patch variables initial values.3 |6 w$ E, S4 x- h2 H2 a
;; Create num-cars of turtles if there are enough road patches for one turtle to% q3 g; X" r& K; E: l8 u. q/ T
;; be created per road patch. Set up the plots.
+ Y/ c2 @$ i% h( Y0 J0 l6 O* Cto setup2 T' f1 A& T! U( |3 b
ca
( S% ^7 S( Z8 R setup-globals2 R- n, V4 a- T0 K8 ]
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;; First we ask the patches to draw themselves and set up a few variables" Z0 R" o. P6 R
setup-patches0 z" Z6 E+ H3 A, X3 |' Z" Y
make-current one-of intersections2 ?, G' ^! V% s" f
label-current
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set-default-shape turtles "car"
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: l, K+ ^1 I; \ if (num-cars > count roads)
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1 ?# s; t! t2 l% Y' a1 @( U user-message (word "There are too many cars for the amount of "
* Y3 |$ d8 \: m "road. Either increase the amount of roads "% {5 v. n4 {6 p* S) D
"by increasing the GRID-SIZE-X or "
& p' O- v1 t/ H "GRID-SIZE-Y sliders, or decrease the "- j S5 q0 z* b0 p( s. k0 l) X
"number of cars by lowering the NUMBER slider.\n"
* V% ]$ l- ?2 M- E( o, }4 u "The setup has stopped.")% ]& N3 W) w- F: X' H
stop( J0 e" @) ?# \
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
2 J7 W( |2 H& {) n1 m crt num-cars
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$ l4 m( a' ^4 }- y2 I; p setup-cars
6 t5 f: ]. i) Q9 ]+ X) } set-car-color( g. f7 U- M# ?, x* ~6 {7 L$ [8 f
record-data
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;; give the turtles an initial speed
! J$ M/ Z+ _) r& x# \ ask turtles [ set-car-speed ]
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) b! f% x) K9 o% [ reset-ticks/ ]* e. \% j2 z& I* M, U. O* d) w2 v
end/ H$ I/ {6 x% J7 c6 h
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;; Initialize the global variables to appropriate values3 W! @4 g, w9 B7 i: U
to setup-globals
& K/ O$ M( t3 ]. I2 Q Z! ] set current-light nobody ;; just for now, since there are no lights yet
6 ]9 o$ d6 r/ J1 H7 ^: y set phase 04 f B' N' \3 ?, x! F1 `
set num-cars-stopped 0' B( P( |) f1 X
set grid-x-inc world-width / grid-size-x
4 N6 ^9 Q# U* b' O$ m% c' Q, K set grid-y-inc world-height / grid-size-y" J" M8 g4 \/ v& K( e
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
) t( _: E) H1 { set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,9 T- ?6 d7 {# K( i1 `; B
;; and initialize the traffic lights to one setting
1 G! s; m) r4 u! Vto setup-patches% m" p* M1 @$ r( C/ z) S. Z
;; initialize the patch-owned variables and color the patches to a base-color6 G' t0 m+ Y- w2 J# j
ask patches: A0 U5 f5 x; T6 U% Z( ?# ]$ r
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set intersection? false4 d7 Q; R1 D' d9 c- k! X# l
set auto? false5 L0 H& b+ L0 i' e: Z7 m9 q
set green-light-up? true* l" v" D. V% x; r# t
set my-row -1; x. O6 [7 R U" l7 g8 Z
set my-column -12 i: K, q8 I7 I; v5 ?- o
set my-phase -1
9 e- z; x4 ]: A3 r set pcolor brown + 30 p Z: y2 r$ ]5 P% T
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/ X# ?' C) C$ `# t* a' H h ;; initialize the global variables that hold patch agentsets7 Y! X. e, L" Z3 M
set roads patches with
; x$ i I: F4 ?5 M! q" e [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 y; y- k: n& i (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# Q" G9 i/ K, i( [7 l' o
set intersections roads with
7 {- F% U$ `/ ?$ Q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
|. d% i: y. [2 g* h) {. r (floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ ~3 {8 a0 T- O1 |
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ask roads [ set pcolor white ]. N: p( b" Q" M2 s4 H' [
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?5 n2 N; D( t2 a! d$ V7 O) F
set roads patches with
( H Y% U: A" G8 o [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ r. }3 H8 O' E- { m0 w
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& P+ y* x( s. P% e& b5 k( k* K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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