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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。
) Y- q6 q6 `; F/ X$ z! O5 N* m. Enetlogo自带的social science--traffic grid这一例子当中,
3 R! Q* ]8 l2 M6 dglobals
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8 q P. H! ]; ~& l/ Q$ a grid-x-inc ;; the amount of patches in between two roads in the x direction' [# M0 P. b6 w! `
grid-y-inc ;; the amount of patches in between two roads in the y direction
9 Z" n3 [! Q; E8 t acceleration ;; the constant that controls how much a car speeds up or slows down by if; e9 j$ ~+ F- K( C1 @. P
;; it is to accelerate or decelerate
6 u6 M5 A: {, }! H$ G; [5 C! n phase ;; keeps track of the phase
$ W. e" a+ P: E; ~5 A num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
3 Q. P; R% X# i3 i, ?& @. l" T& u current-light ;; the currently selected light
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;; patch agentsets4 u5 p+ u& Q, i; a/ w% r z; d
intersections ;; agentset containing the patches that are intersections
( k H) j. C* Y& c: S4 r- S9 I roads ;; agentset containing the patches that are roads- X' P3 w% y/ E5 H+ E% @* L% t* R
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turtles-own
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, u9 \7 N! v3 } speed ;; the speed of the turtle
* n6 D% j' W2 l up-car? ;; true if the turtle moves downwards and false if it moves to the right
" k- S# `* `( ^9 h) K" E wait-time ;; the amount of time since the last time a turtle has moved( [1 S( q% t8 @3 F* \! w
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patches-own
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0 p: D9 Z! t9 j# X intersection? ;; true if the patch is at the intersection of two roads
% l0 J% x' K$ t+ c: n- M2 a green-light-up? ;; true if the green light is above the intersection. otherwise, false.# T. j2 k+ ?$ p' P, ~
;; false for a non-intersection patches., k' e% a6 L+ F, f
my-row ;; the row of the intersection counting from the upper left corner of the( u5 v4 \* M( {' |" R" X
;; world. -1 for non-intersection patches.
T: [- S1 z! f0 Q y my-column ;; the column of the intersection counting from the upper left corner of the8 w/ ~0 c3 S6 ^1 L# [! I! p5 Q8 z
;; world. -1 for non-intersection patches. G! c' Q N+ b) N6 ?' T
my-phase ;; the phase for the intersection. -1 for non-intersection patches.; a7 g2 @# a0 S8 J
auto? ;; whether or not this intersection will switch automatically.
7 h1 O/ \" z% i ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
' O6 B9 B% S$ I z" o;; Setup Procedures ;;2 j, T o0 f% A% h% }! h3 y& I
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
* b! h+ a) O7 y/ U;; Create num-cars of turtles if there are enough road patches for one turtle to4 `' m8 Z( w g! K" G
;; be created per road patch. Set up the plots.
! l7 U$ e( X l( |& ^! mto setup s0 B8 T2 V* z* C) A
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setup-globals
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' R. ^* X. E" s3 V ;; First we ask the patches to draw themselves and set up a few variables
5 l1 w6 o; g$ @7 C% A2 ~ setup-patches
% X( ? e" E& n3 U make-current one-of intersections7 K% }4 `% g$ X3 I1 u
label-current
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# }2 e( ^" O3 @# J set-default-shape turtles "car"$ }8 ]7 z0 C% X$ @( w- \! ~
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if (num-cars > count roads)" T. T/ \# q. o u" b9 ~& |- B
[
# H- W6 s' Q' ]: [2 U* P. @ user-message (word "There are too many cars for the amount of "
/ }7 C- w3 S1 { "road. Either increase the amount of roads "* Z7 a: @# g# s; z
"by increasing the GRID-SIZE-X or "7 v4 z, J6 h: \" g( d) e, ^# O
"GRID-SIZE-Y sliders, or decrease the "! B; _: u' X9 ~6 u+ `
"number of cars by lowering the NUMBER slider.\n"' h& W# x2 g& J; ]
"The setup has stopped.")
* o3 t3 ?6 z* x$ D h- J3 c stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
2 \1 O/ Q' C8 G2 l# y( g0 Y, D- t crt num-cars
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setup-cars
9 t! J- }/ @- n4 j( K set-car-color: e: I& V9 G9 p2 s- C- a
record-data- G' C/ H" ?# G5 w5 X) z" Q
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( R- L: J$ Z# D, f* T ;; give the turtles an initial speed* {5 [3 \. p3 J/ [
ask turtles [ set-car-speed ]
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reset-ticks4 G @* ?/ H5 t0 a P
end
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;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet P8 P% d% E! J% k3 q& ?
set phase 0) I8 z, N+ j4 [9 g4 T; }; L
set num-cars-stopped 0- L+ S, J+ Y; B$ R% z
set grid-x-inc world-width / grid-size-x, b# L! ^2 g$ Q, s* P% I
set grid-y-inc world-height / grid-size-y9 }: {. x$ `' W$ D8 ]/ [- j
. T9 F& J* O: o3 x* x% r6 p ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary, b r9 ^* a' D9 O
set acceleration 0.099& J ~ y; L4 W+ F
end* o/ r& S5 L3 Z4 g) f% c
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
2 F5 ]" s7 `8 ?' t; T7 x;; and initialize the traffic lights to one setting1 g1 J/ n# N: v+ z% ?0 k. H
to setup-patches' `: c- Q7 z' l3 `- w7 k
;; initialize the patch-owned variables and color the patches to a base-color* Z% v) `$ T$ {- u
ask patches0 M( ]# h9 G; E+ O O
[
D) E$ B7 M: R% m) e set intersection? false. M' g& N2 J% j e* |9 S
set auto? false6 [, B; _! Q- r. ]7 o9 E. U
set green-light-up? true
$ ~: e* E2 ] Z. }( ~, E set my-row -1
- I+ R) \8 f( @9 G7 Y- a set my-column -1' I' G& e. e( D. V* B
set my-phase -18 C1 Z( D3 c2 N, ~9 i( t/ [
set pcolor brown + 3# |3 a# f$ x1 @) N# H- @) f
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;; initialize the global variables that hold patch agentsets6 w! B8 h. \3 |6 i, {1 f- O c+ i
set roads patches with" K" `" d! [$ l- _0 Q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" ]3 a* d% d1 v& \. {& N' C) E
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ q7 [' Q! S# e4 S* {$ u% Y$ ? set intersections roads with7 e4 w) N: _# B K8 K
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and0 i) j- ]& e6 h3 ~% A6 U: y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* x; ~2 b. t* X1 ^4 G
9 N' n! y. n" N0 q* P+ _: q ask roads [ set pcolor white ]9 e C7 q4 s# P* I
setup-intersections7 f2 b2 p. f \! ~
end' [2 s$ U6 N( x
其中定义道路的句子,如下所示,是什么意思啊?
2 q+ ~- L- j8 ~6 [5 Y set roads patches with" p# V) j/ W7 T6 p. D( Q- W, \# T
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ t( [( p9 j/ j (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' v3 z# [9 s' f4 S( I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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