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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。
; a/ c3 N W( W% C) V9 O2 bnetlogo自带的social science--traffic grid这一例子当中," Z H& g: d3 T( `
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
- M7 v" @( V6 I& C. k grid-y-inc ;; the amount of patches in between two roads in the y direction$ Y* }5 m( N+ H1 p2 ^
acceleration ;; the constant that controls how much a car speeds up or slows down by if
, C6 O: ~! V; g5 F0 S4 d ;; it is to accelerate or decelerate0 U% w& r5 l4 d$ U# v* k+ C
phase ;; keeps track of the phase" U- g0 `3 ~1 i. Z$ t+ n5 l
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
# _: P; M0 C# h7 ] current-light ;; the currently selected light6 x& z( A6 U* ?; i% W3 i
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;; patch agentsets, z7 ^2 |; b3 \. E1 Q4 T' j
intersections ;; agentset containing the patches that are intersections4 L+ o8 f) }0 Y# U3 K
roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle! @# [0 R! j8 o- w+ {* ^
up-car? ;; true if the turtle moves downwards and false if it moves to the right
# t$ L! l. C) U: W, p wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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+ E2 u5 x/ p& S/ Q intersection? ;; true if the patch is at the intersection of two roads X/ [5 Z0 r6 k. y+ }) {
green-light-up? ;; true if the green light is above the intersection. otherwise, false.7 N4 _) G6 S U( F
;; false for a non-intersection patches.
) I6 D: h! m$ p2 v+ J; I my-row ;; the row of the intersection counting from the upper left corner of the
* Z9 N/ {; r" R `8 h6 o0 V, C( ~3 ` ;; world. -1 for non-intersection patches.
. \) I. P: ?7 a' D2 O my-column ;; the column of the intersection counting from the upper left corner of the
" W' ~, V. W3 R" x9 i$ s3 D: H4 n ;; world. -1 for non-intersection patches.
3 t& V9 I! ]0 l" q! D4 Z( g my-phase ;; the phase for the intersection. -1 for non-intersection patches.& x$ N0 S2 a2 h5 p+ ~; p
auto? ;; whether or not this intersection will switch automatically.3 B9 i4 B! f1 g. c2 m9 P+ D
;; false for non-intersection patches.9 F4 l3 f2 [( u; t
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;;;;;;;;;;;;;;;;;;;;;;
( H4 v: ^% Y& R: x. [;; Setup Procedures ;;
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! [0 }8 Z' G- M) U+ r0 H;; Initialize the display by giving the global and patch variables initial values.
% V- t- T& Z: P! O" G;; Create num-cars of turtles if there are enough road patches for one turtle to
1 O V8 g7 R0 K) g. m;; be created per road patch. Set up the plots.
8 V( ?+ z; \" sto setup# f% t% C9 C% `; R
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setup-globals$ z8 c2 `9 @ d! h$ e7 M" t
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;; First we ask the patches to draw themselves and set up a few variables
7 ~8 s: J, v5 M$ z k5 B setup-patches
% o j6 x' Z* w8 H$ Y+ V7 N$ z make-current one-of intersections
: p% q0 S5 t+ Z5 a7 y, } label-current" c0 i1 D& w4 w) p3 o7 M
& F4 o0 V8 Y6 K% T1 G- a, a set-default-shape turtles "car"
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6 {/ Z# C, c/ `; b0 n9 N if (num-cars > count roads)- |: k1 S$ V& Y% B$ u3 Y! t
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, T. W' m! h8 n1 G" m user-message (word "There are too many cars for the amount of "9 n6 j- C# `0 A4 }
"road. Either increase the amount of roads "; R! q( W b* x7 M9 Z# v% }
"by increasing the GRID-SIZE-X or "- z) ]2 i2 Y0 q1 j' B4 i* K
"GRID-SIZE-Y sliders, or decrease the "
% b: J( Y7 Z, ^3 F( J, @ "number of cars by lowering the NUMBER slider.\n": v E/ [$ B7 Z3 E6 i# z5 N
"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( `0 A" D) h* m; P0 S6 A% q
crt num-cars
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setup-cars
/ M% D3 j6 u1 n y/ A$ o8 V set-car-color } ]6 @$ u0 \9 G. N2 L
record-data8 ^# ~* x1 n. t0 W* Z& `
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5 o9 q" l7 p- |/ C ;; give the turtles an initial speed# T. G4 \9 k5 J7 \- g
ask turtles [ set-car-speed ]" x' {% S' Z# }. T
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reset-ticks
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;; Initialize the global variables to appropriate values- F3 b( h$ P7 z4 h) T
to setup-globals! X0 F) e/ C- M. j& V# R
set current-light nobody ;; just for now, since there are no lights yet
+ ]8 Z" y* J8 m5 ^& p set phase 04 j) O/ U+ N! R: y4 N6 r3 H
set num-cars-stopped 0
2 E) a }* F. O) P4 M G4 e set grid-x-inc world-width / grid-size-x) x2 P; Q4 q5 }& @0 Y y2 a
set grid-y-inc world-height / grid-size-y o& Y6 w/ B) C) p" D% I
, U4 H' W8 Q1 k/ S ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary ?( p+ |) M. w" y" I z
set acceleration 0.099# o; c# D! t9 [; n- A8 K
end
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" S6 c }9 B8 `8 n9 y* i;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 P1 M2 c; ~& C J) p;; and initialize the traffic lights to one setting% H3 h1 p i' a% b( V
to setup-patches% W# x) Q2 q0 p$ e/ T, Y
;; initialize the patch-owned variables and color the patches to a base-color8 o, N: \6 y) f7 a
ask patches
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) c, b7 J3 L. C: P' K. V set intersection? false
3 H( H$ C: p" `- A) c- l/ o set auto? false
5 I ~: Q. r. P1 _. I$ V set green-light-up? true
& g" c. J; I" Y3 r9 L! F& x set my-row -1* ?3 L0 x C$ N8 ]: a1 d# C( n
set my-column -15 |: }, j& B) f. N/ c2 ~
set my-phase -1" C. P8 ~2 j& j3 f+ c
set pcolor brown + 3
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( w% y' n! [+ |2 V3 y3 E% d7 e ;; initialize the global variables that hold patch agentsets
! P& n* s' ^: q set roads patches with
3 G/ j3 x5 D- I, g8 ` [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! u( k, T7 W( \' b (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; P; F# @7 u0 S* g5 M/ ?
set intersections roads with
- f" ?. H7 w. c |, q5 r [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
; K" c. e: z: K- o* e- g8 Y$ c (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ r% ?" B( x& x) R
$ T; x; v. a( ~7 Z. J% k ask roads [ set pcolor white ]
3 v. y+ R' U* `+ U setup-intersections' R" V* ]" S, ~6 ~) s: k
end
# z+ x6 E* D4 p: m" u- E) @0 N t其中定义道路的句子,如下所示,是什么意思啊?! w% h# r2 {+ V2 P: X
set roads patches with4 y; H3 z1 e7 o7 W8 x
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: V( @1 U7 H9 l2 ]0 G5 B {/ ~ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
?0 r2 q- ]1 B, h& m5 L' e5 d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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