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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。7 }- G% E0 {% ~0 S
netlogo自带的social science--traffic grid这一例子当中,
7 v Y( H! u& E2 ?8 R9 }globals- n+ u" l/ F& E- Y, J' F
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0 g$ a* H# `' k+ f3 }+ A7 U0 o+ l/ q grid-x-inc ;; the amount of patches in between two roads in the x direction
2 x' W `' U% b. Y% O grid-y-inc ;; the amount of patches in between two roads in the y direction/ h3 @; u. M; V: h+ h
acceleration ;; the constant that controls how much a car speeds up or slows down by if
" v' i: ?9 f$ g4 F8 y3 E ;; it is to accelerate or decelerate
- L& S" T s+ B, d0 L3 r. L( P phase ;; keeps track of the phase
( Y, F2 j' E1 S6 x" `. Y8 t num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure$ y" z2 Q4 o( ^! h
current-light ;; the currently selected light
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, ~; ?! D4 @1 }, a+ h) h ;; patch agentsets: [& B& R6 R* m5 ]
intersections ;; agentset containing the patches that are intersections o( r* D% G( S0 M& e- E2 k
roads ;; agentset containing the patches that are roads
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turtles-own
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2 P6 ~1 X( m) _' V$ C& } speed ;; the speed of the turtle
5 O, ?( ~; z* |% ^8 Y6 G. M$ h) F up-car? ;; true if the turtle moves downwards and false if it moves to the right
8 n, r8 b1 d2 F2 W: r wait-time ;; the amount of time since the last time a turtle has moved4 A$ i6 b9 b! z0 t1 m4 W
]
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads+ O" P; I' m, }- P+ N/ J9 N
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
3 T, j" I% Y" U4 Q* L$ F% t w ;; false for a non-intersection patches.. |. K& [+ W) o+ P
my-row ;; the row of the intersection counting from the upper left corner of the1 R/ v* a5 l5 o" X5 `
;; world. -1 for non-intersection patches.
1 S# ?5 B) r7 X7 Q+ ^9 [% a/ [2 [ my-column ;; the column of the intersection counting from the upper left corner of the
7 i1 u& F( _1 ]! n ;; world. -1 for non-intersection patches.
5 _! G4 p3 y- P d7 x my-phase ;; the phase for the intersection. -1 for non-intersection patches.( F; X7 K# q+ r3 Y6 N7 E+ g, Z* v
auto? ;; whether or not this intersection will switch automatically.0 A% g4 ~( X# @& q* D3 a; F3 Z
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
% ?8 {% t" Q/ l;; Setup Procedures ;;$ d5 }/ `0 p ?5 F
;;;;;;;;;;;;;;;;;;;;;;
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3 Q# \4 M% E3 M l;; Initialize the display by giving the global and patch variables initial values.$ P9 x, _& _) P' t7 q
;; Create num-cars of turtles if there are enough road patches for one turtle to% e, [0 G- E! X0 T$ `
;; be created per road patch. Set up the plots./ Y) N8 [# U8 ]% i' u N, P' f
to setup- }+ B4 E$ o' l7 b! G+ J' v
ca
3 U/ d8 S% E# X setup-globals5 g( t# p% b0 e
% R9 J$ `# h y- V ;; First we ask the patches to draw themselves and set up a few variables5 f( `1 t n; A! t2 [" f
setup-patches4 a2 [$ X! D, K- Z. R
make-current one-of intersections7 B w# V6 b' l
label-current5 m0 y( W, {& ~& t0 `: h+ R( p
7 [$ L5 v; w# M* n set-default-shape turtles "car"
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if (num-cars > count roads)) f. T* O! M) [+ r
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user-message (word "There are too many cars for the amount of "
7 M% v/ I& K. O! X. K; ^! b! p "road. Either increase the amount of roads "
% ]6 P. d; K3 y% Q1 [ "by increasing the GRID-SIZE-X or "8 {8 C% j) y! Y
"GRID-SIZE-Y sliders, or decrease the "& n1 p" k% ?' }, K& r5 i2 c
"number of cars by lowering the NUMBER slider.\n"8 @# d/ |7 z5 A/ U$ |
"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/ R& l: ~0 a, E m9 E& r9 U
crt num-cars
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setup-cars
: m7 n! r2 T4 C# a9 F! [' u set-car-color
( Q9 D- z8 K8 z" N8 ?0 j record-data8 i' w- L5 M+ n' b ^
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: f2 F3 ^/ n K& L0 a6 O ;; give the turtles an initial speed- q* }" r% ?" Q8 d5 Y" y6 L' e# m* ]
ask turtles [ set-car-speed ]- O2 {* }: w" C, Z, Y
$ \( R" C3 m) C1 {' n reset-ticks
! W2 {, E) l% Y+ M- Z, v( g8 Oend
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;; Initialize the global variables to appropriate values+ f4 E+ k- w$ d v! d
to setup-globals
( S; m$ H d" U# Y4 ^ set current-light nobody ;; just for now, since there are no lights yet6 {0 D, k3 a/ F) ~* @
set phase 0
) c) Z ?0 ~, x6 n8 X. y& L set num-cars-stopped 0
- d! Q- ~# N# t" b set grid-x-inc world-width / grid-size-x
% P. ^' F' Q- ?6 F set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
. E& P. X- R" m: z1 j, g set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,6 q8 j% ^/ A% Y, Y5 I
;; and initialize the traffic lights to one setting8 m$ F1 A0 H+ S) z9 }# X
to setup-patches7 R2 ?5 I' g8 |! S
;; initialize the patch-owned variables and color the patches to a base-color- O. [1 Q" j1 i2 s1 `5 T/ d2 y- l
ask patches
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# I* I! {, s- C# S/ [ set intersection? false
9 Y9 i. T! E/ X$ M+ Z; m* C: i" E/ Y set auto? false
y$ v& j8 \* @: X# A set green-light-up? true1 f' h: j6 R* J) l
set my-row -1' |1 C3 o) q. A. _
set my-column -1
G( H, B5 s% a( j set my-phase -1
6 W( V+ G0 w1 k( b4 K4 b* z set pcolor brown + 3
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3 y- }! g3 C: f7 l8 \ ;; initialize the global variables that hold patch agentsets% F! e1 ]1 O, x7 e
set roads patches with
5 G# D5 L& |5 S& \4 |$ \) j [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" `" X( D U$ ?+ G$ q- B. ~ ^ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 q& H, \* @8 ^+ Y# ~1 G
set intersections roads with7 P$ m ?: [. h4 d3 d' k
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
$ V( W: n3 Z8 U; u1 {" p3 L! n4 L4 L$ X (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]6 W. o, }$ C# I/ e: g. g" [
setup-intersections% a% d" \$ `. `" o) K/ |
end8 E" Z/ O) }- i" l+ C* E
其中定义道路的句子,如下所示,是什么意思啊? M5 S+ \0 Q% p% \5 y
set roads patches with: H! j$ s) ~: X7 p
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# u; s7 @- `: {! b (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( T3 |. \, _( P
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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