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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。
5 ~! ?! L2 U0 T1 ^& F' Unetlogo自带的social science--traffic grid这一例子当中, b1 l; C6 Q* [7 k x( ?& ?2 a
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction, `( \( b% I y3 y( q1 D8 W
grid-y-inc ;; the amount of patches in between two roads in the y direction
4 P1 P. E9 Y, |+ ^ acceleration ;; the constant that controls how much a car speeds up or slows down by if
; A# Q1 ~8 D1 b- B$ Q, _. T; K4 I$ u ;; it is to accelerate or decelerate
5 r9 e# c8 ~3 l+ o7 { phase ;; keeps track of the phase
! d" K( j- V, n) }/ z num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure8 W9 L1 |# q3 k$ J: \) r
current-light ;; the currently selected light
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% G( T5 J: h' g) I4 i" a4 t ;; patch agentsets7 C6 ^* @; v6 H1 _0 I
intersections ;; agentset containing the patches that are intersections
" n! ]3 h0 w* ~7 m roads ;; agentset containing the patches that are roads# I! N- @* Q0 [$ i m8 K
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turtles-own: Y* G& C! S; Z5 u2 u
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speed ;; the speed of the turtle
9 _4 f) R* [ H, q up-car? ;; true if the turtle moves downwards and false if it moves to the right4 m" L8 Q; i) I8 q( F3 c8 Z
wait-time ;; the amount of time since the last time a turtle has moved7 b8 v. x, B) ~: d& I1 B
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patches-own$ I% {7 ]$ \1 g2 C- C8 E6 a
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2 I# c2 H! [: b intersection? ;; true if the patch is at the intersection of two roads7 U) a& ~/ g$ k( |
green-light-up? ;; true if the green light is above the intersection. otherwise, false.0 \/ u$ `0 V& q% S: b7 G+ w% ^9 o
;; false for a non-intersection patches.8 L) R2 C' `' x, R! b# ?
my-row ;; the row of the intersection counting from the upper left corner of the
! c0 M7 c/ i$ p- C i ;; world. -1 for non-intersection patches.
( s9 F& _# U- q, L' w my-column ;; the column of the intersection counting from the upper left corner of the2 l' f1 \9 h) h( v
;; world. -1 for non-intersection patches.; D" ~8 c X: l9 [) ^
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
& z& ]4 Q8 w/ T; X auto? ;; whether or not this intersection will switch automatically.
/ ~9 z; H- L* H2 N ;; false for non-intersection patches.% B7 p5 c L& R! G
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;;;;;;;;;;;;;;;;;;;;;;& e( K$ G$ Q+ L* }. {
;; Setup Procedures ;;
5 {# s1 g/ d, i; ]/ b;;;;;;;;;;;;;;;;;;;;;;) s! F r! i; W2 W9 r
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;; Initialize the display by giving the global and patch variables initial values.
4 ]. k2 H x. W9 {* v;; Create num-cars of turtles if there are enough road patches for one turtle to5 U u1 D( Q6 c
;; be created per road patch. Set up the plots.
- x( H. Q- o- W& mto setup
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; Y! k8 ^! R9 w6 Y setup-globals
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4 [( R- C; s. I5 r ;; First we ask the patches to draw themselves and set up a few variables
1 J: ~4 H; |) d" o setup-patches# F/ P+ y/ ?5 Z5 s
make-current one-of intersections
- `, x6 k. T L' }# ^) V label-current
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set-default-shape turtles "car". C0 v) D8 t% M' Y5 j* q4 [
+ I/ K3 j4 w$ c# A4 {2 L- y. w6 A if (num-cars > count roads)
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' {. R8 h2 t$ v! U& k0 V- q; k user-message (word "There are too many cars for the amount of "
3 b. m% ?( g; w1 G7 t" g "road. Either increase the amount of roads "- Y2 K* t `# v" D
"by increasing the GRID-SIZE-X or "
! G: \& S; E0 t "GRID-SIZE-Y sliders, or decrease the "
* E1 e D7 {; I3 y "number of cars by lowering the NUMBER slider.\n"0 f( m# E5 ?+ s4 i% n2 ?
"The setup has stopped.")
" z2 G* o2 C/ A# Z: d5 Q stop
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, f, W4 I$ D; T! {% p- q' Y0 `. h" Q ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 |4 E2 f! q6 \7 i- [7 d& F; {/ w( L
crt num-cars% N+ S$ [+ i6 N4 H- X
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setup-cars0 D/ O7 l4 f, \: B7 Y7 E/ `
set-car-color
1 P o' b0 i( E" D" U( o { k record-data, H- G! H, C, o$ ^' H
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/ C/ l( n/ I( N. m* b ;; give the turtles an initial speed9 X" W+ @# S6 t5 ~7 {. u8 R5 J
ask turtles [ set-car-speed ]: l& N0 }0 o! U+ W$ R2 ]5 X3 k
/ Y: d0 _2 I9 X- i* _# I reset-ticks4 P/ F" m/ ?) x _& U# D# |
end
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;; Initialize the global variables to appropriate values
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/ m7 ^8 F* u) Q0 Q. \ set current-light nobody ;; just for now, since there are no lights yet" c. }0 I; W& D4 a- H8 |
set phase 0
! N5 h6 m$ q/ c ~ set num-cars-stopped 0
+ [/ j6 \! {0 q7 Q } set grid-x-inc world-width / grid-size-x
5 i: O' k4 C% } set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary. A$ B; z- B; M( [
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,) h% q3 R$ Y0 X) n. O; U2 h
;; and initialize the traffic lights to one setting* E, a$ \+ o+ M' y. n
to setup-patches
: K. T6 O! k( a9 K ? ;; initialize the patch-owned variables and color the patches to a base-color
+ b+ j% j- i% ? Q1 t. A% P ask patches% w4 U' E3 ~2 ~: M. B! M/ V6 l
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1 F$ L5 o) h9 r* {' t) E set intersection? false. L( k( w. j1 H7 Z" B
set auto? false
+ D8 y* E. I: T( d set green-light-up? true a& T5 S; p' o: x
set my-row -10 D! H1 m- g; P3 u+ d$ O7 G) K
set my-column -1
3 R# G# B- n' Z B0 n# Z set my-phase -1
. I+ j* R0 x3 t, T7 o' p, c set pcolor brown + 3
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, S Y& }0 t" ] F6 I ;; initialize the global variables that hold patch agentsets( q6 n7 a# w8 G" I5 e2 V
set roads patches with
5 K8 E% ]; Y: U( _" ^ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* {1 P `: ~1 a% L. P5 } S (floor((pycor + max-pycor) mod grid-y-inc) = 0)], S" Y6 i; L7 z9 p
set intersections roads with1 T; U2 H; Z8 U7 ]
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 m+ S( g" E3 r ~7 H8 t (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' W Y3 @8 z I% d
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ask roads [ set pcolor white ]$ C/ }% J, o* G' K
setup-intersections0 t4 ~8 C( A2 w
end" G5 x, f$ |( z2 m, |6 S
其中定义道路的句子,如下所示,是什么意思啊?5 }% J" D* }/ O/ C: T1 b
set roads patches with
L9 f" X9 ?( Y1 k2 \ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 Z$ l" ~$ q7 y. }) L. _" j (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 r# `! d$ ^% w7 j B
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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