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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。2 j: q& i' X0 T
netlogo自带的social science--traffic grid这一例子当中,& M( d9 k4 F. R- l' A- g8 e
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
) `9 I. f0 Q. s# h grid-y-inc ;; the amount of patches in between two roads in the y direction' ~0 ?9 j" B: H" O+ X8 l% I
acceleration ;; the constant that controls how much a car speeds up or slows down by if
* c; F& m' w2 R& Y3 h% x$ W. n ;; it is to accelerate or decelerate& x3 b3 J3 A9 O$ w w9 b
phase ;; keeps track of the phase5 \8 r: a6 ]1 ?
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
9 f- U- @' P% H4 } current-light ;; the currently selected light
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7 {6 Q* X" N/ { ;; patch agentsets
$ B( J p0 W! }8 N intersections ;; agentset containing the patches that are intersections
" c7 c1 x& I; B. N" q7 Y roads ;; agentset containing the patches that are roads
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turtles-own& A x3 ^" \3 Z+ Y+ q1 D9 ?
[
4 o& q7 B2 l$ T- Y/ m speed ;; the speed of the turtle# c0 Q( P0 d0 x8 O M
up-car? ;; true if the turtle moves downwards and false if it moves to the right& | K X: d2 M6 `" P
wait-time ;; the amount of time since the last time a turtle has moved
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1 k* w1 E. ]( y0 e* \patches-own
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* k U+ k' Z3 ^5 L$ X intersection? ;; true if the patch is at the intersection of two roads
/ J3 m" j% T! D6 }8 i1 j green-light-up? ;; true if the green light is above the intersection. otherwise, false.; D b1 r# o: E" _) [$ U6 P
;; false for a non-intersection patches.
! C% z# }3 Y5 w& c: x' D my-row ;; the row of the intersection counting from the upper left corner of the8 p1 a5 ^/ ]- O8 e3 w
;; world. -1 for non-intersection patches.
) I/ D; q+ f! E% k my-column ;; the column of the intersection counting from the upper left corner of the$ _2 L B+ a( G& [$ i% \, m8 J3 o
;; world. -1 for non-intersection patches.# v D/ s7 K) Y: l% }4 _1 U
my-phase ;; the phase for the intersection. -1 for non-intersection patches.7 g! e% K" P: ^& a
auto? ;; whether or not this intersection will switch automatically.9 `: V: W% O" T- `2 G% p
;; false for non-intersection patches.
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0 O6 Y) }) v5 i% j# w$ C7 |;;;;;;;;;;;;;;;;;;;;;;0 \; g7 o. `0 x {7 {
;; Setup Procedures ;;
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4 ^: w" \$ N$ f( Q;; Initialize the display by giving the global and patch variables initial values.1 ^' H% T6 P, j
;; Create num-cars of turtles if there are enough road patches for one turtle to& ^ a) p- v; C/ | ?1 I
;; be created per road patch. Set up the plots.
3 a6 ]: V* I( `to setup; d9 R8 r8 B6 K$ q1 _
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setup-globals
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% K0 l5 h0 W& G# U$ [+ k# W$ U! l ;; First we ask the patches to draw themselves and set up a few variables7 z" j: i1 M0 ^6 Q3 t7 r' o
setup-patches
+ i1 ~6 f s2 M. s1 R f. r( s make-current one-of intersections
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# z; |" x! {+ k7 p set-default-shape turtles "car", [, f5 n! Q6 g" e; ]) W: p% b6 O
4 N$ p# y, ^- j0 m+ U if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "7 Y/ S9 s+ U$ P7 k5 x9 m
"road. Either increase the amount of roads "* ~; Y6 v( M* s
"by increasing the GRID-SIZE-X or "/ n! t8 C- z, r, j0 Y
"GRID-SIZE-Y sliders, or decrease the "
/ W5 {* T6 c$ A4 q "number of cars by lowering the NUMBER slider.\n"
1 g& ]; m/ }: m "The setup has stopped.")) v2 n: Z F4 ]! D* G% \0 _
stop& k0 ^; J. m. J) k
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
0 O$ M3 K) _9 w+ x1 y# q- p crt num-cars
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* k" l ^" `; u$ h setup-cars7 w% l7 m$ V& P
set-car-color
2 d$ ]0 x& U( L% k. m record-data! e4 b& D1 ~& z6 `3 M
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; O2 I, G' ^" W; e F- j4 Q ;; give the turtles an initial speed: P" ^9 `1 C3 V X# P6 L
ask turtles [ set-car-speed ]
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6 m1 y* Y3 n- f( r9 |3 |% `4 z* L reset-ticks
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;; Initialize the global variables to appropriate values5 R: A5 u3 r$ v% F! ?/ v
to setup-globals9 U9 q+ m( _4 a% }! i
set current-light nobody ;; just for now, since there are no lights yet ]5 |( J3 I: ~$ ?5 R
set phase 0
3 Z/ U8 H t8 }7 x! Y% t: b set num-cars-stopped 0
! k' l0 p: Z& s6 h7 d set grid-x-inc world-width / grid-size-x
0 I' A" B" c& o) n, P# R set grid-y-inc world-height / grid-size-y/ Y6 a# Y. \- ?" H5 |) H
/ w' n; Q% g( H2 F( ^ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary5 Y, f' `1 H2 X! E
set acceleration 0.099
0 `, w7 Y q" c; R% Z& }: m% Uend
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8 l$ ^! w# t' t+ N& j8 U;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
! J- D* m9 j5 A;; and initialize the traffic lights to one setting
' d3 F+ ?( c5 a( h1 oto setup-patches) b7 F6 X# x1 p
;; initialize the patch-owned variables and color the patches to a base-color' A3 `+ Y' u" a' O! Z
ask patches
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set intersection? false7 c+ o' F c, T n/ I: Y" t
set auto? false
b# r; a5 G4 j4 K5 {8 q/ _: { set green-light-up? true
( M: z6 ?2 T8 \" m! D set my-row -1
, P& d$ U8 A, @1 p+ y3 h E set my-column -1/ E3 j% [" o1 j2 G+ t% E
set my-phase -1
, x: u8 f/ e5 g) o6 y set pcolor brown + 3
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$ N5 _, Y3 v7 q* J' D0 n ;; initialize the global variables that hold patch agentsets
3 \/ V8 s0 o& b! u; i set roads patches with
% d5 s" g3 P; X+ L [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, |, u: M) ]2 |3 [9 b Q
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 s6 N2 p$ t) z' L: L
set intersections roads with) \' X0 A y W+ k' l
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
( ]$ |2 n0 g; b: l! l* K (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]' k: [2 ?! [1 g! w! k
setup-intersections
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& B. }# E* q6 m4 @% R其中定义道路的句子,如下所示,是什么意思啊?3 k; \! C# G8 L5 Z; Y
set roads patches with
6 s. G: z R( u7 E7 D [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; Q9 A+ @: o: B j (floor((pycor + max-pycor) mod grid-y-inc) = 0)]% r- y1 J8 I- p4 o9 E4 E
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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