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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。
3 j! w1 U3 \" j/ w9 tnetlogo自带的social science--traffic grid这一例子当中,
% ?" z/ |2 W9 X& x. t9 R Yglobals
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I- v( ]# a+ C grid-x-inc ;; the amount of patches in between two roads in the x direction
9 H+ h5 d, v0 _; a/ X grid-y-inc ;; the amount of patches in between two roads in the y direction) t% i1 N0 i9 y& {
acceleration ;; the constant that controls how much a car speeds up or slows down by if: [: ^1 m5 N* K7 v, J8 k; ^% a
;; it is to accelerate or decelerate
! V' C& N* G/ d* S& `) O, `: | phase ;; keeps track of the phase5 E$ x$ U! K1 ]0 p" A2 V) h! u
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure D# K# [4 e6 Z2 h9 b
current-light ;; the currently selected light
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;; patch agentsets! E$ A: o/ j& k, a; _! p
intersections ;; agentset containing the patches that are intersections
}. V/ y- k1 O6 m- ^- Y roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle* {' h& |: v( Q5 M9 K4 h" R
up-car? ;; true if the turtle moves downwards and false if it moves to the right1 ~& U7 T0 A4 @! | Q- X* ]
wait-time ;; the amount of time since the last time a turtle has moved
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7 @0 }/ |' U$ w% X" ypatches-own7 H5 U+ J3 ^& z8 m
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intersection? ;; true if the patch is at the intersection of two roads7 U! Z4 u0 g" {! C: B
green-light-up? ;; true if the green light is above the intersection. otherwise, false.$ g9 n% W3 \# @& R! |
;; false for a non-intersection patches./ X2 ]) K9 M( d/ b+ H
my-row ;; the row of the intersection counting from the upper left corner of the8 [- H2 Q3 H8 R% D
;; world. -1 for non-intersection patches.. B) h! F% a, o: ` ^
my-column ;; the column of the intersection counting from the upper left corner of the
- T6 o ^6 } J4 d8 v2 l b ;; world. -1 for non-intersection patches.: d0 V4 _ Q0 I% [) ^6 K' b7 z
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
- b7 n" |# G" J1 [; {$ d, a auto? ;; whether or not this intersection will switch automatically.
; m3 r& S& B3 {) f& G1 D! K2 [2 o1 _ ;; false for non-intersection patches.
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" z: b! K2 G( e;;;;;;;;;;;;;;;;;;;;;;/ f+ f; F2 t. ~/ w9 t
;; Setup Procedures ;;* i6 k; H* D% r, `; l7 \
;;;;;;;;;;;;;;;;;;;;;;$ W5 C! a6 Y4 P# p" B$ M& S7 c! d% S
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;; Initialize the display by giving the global and patch variables initial values.. N% _$ _* f1 Q8 k% D4 b% E$ j0 m
;; Create num-cars of turtles if there are enough road patches for one turtle to
4 e: P4 H; K7 j) j$ i( f;; be created per road patch. Set up the plots.
& P' l7 q! [# Z4 {" N: Q! |to setup# s4 P3 p( P; e$ Q/ |3 Y
ca
" K/ D# Q# I' ?; H setup-globals1 o E! t5 m& n9 X: `7 B
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;; First we ask the patches to draw themselves and set up a few variables
3 x8 J' m( ^ D( p setup-patches1 g7 Q6 n# U; T" ~
make-current one-of intersections
8 T' s! X }+ Z% n1 w label-current# Q, f3 H7 O3 |0 j$ A# |7 ^
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set-default-shape turtles "car"- s! o2 O. q7 ~( H% [ u
8 }, {2 m( S" C if (num-cars > count roads)3 N9 L! P* a( ?4 i
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user-message (word "There are too many cars for the amount of "$ F/ W3 T, v: P; h0 n
"road. Either increase the amount of roads "
% y8 D( n% M- l6 m% w# R "by increasing the GRID-SIZE-X or "
/ C8 I# `# `$ Y- u- A& { "GRID-SIZE-Y sliders, or decrease the "
9 L1 @; \ _% O" w2 \- T2 j "number of cars by lowering the NUMBER slider.\n"
& U* B) y, H" b1 d "The setup has stopped.")% }) P9 x/ I9 v2 i: _
stop) ]/ w V7 u% F- y9 n0 W
]
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3 B; N7 l v D0 |2 E& ]# ~ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
& @# [9 f: T/ e' h. t! K4 Q1 S9 _ crt num-cars
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9 W9 ], k$ Q X5 }3 d- f- ? setup-cars
& h9 A0 o8 v" I/ D: A" W set-car-color. J, X- N1 X3 K' `7 b1 m
record-data
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;; give the turtles an initial speed
1 n' A/ }" ?3 K: P ask turtles [ set-car-speed ]' ~' y( R' ]+ @3 A' b1 {1 e
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reset-ticks0 u) R( f0 T* t. o! C& O- }
end1 f, F$ x9 C! D$ ?+ x
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;; Initialize the global variables to appropriate values
2 j1 d7 {$ Q: ^ ?$ o% Mto setup-globals% B8 i! m Z2 e/ a% w
set current-light nobody ;; just for now, since there are no lights yet/ v2 \7 j. m3 O# X5 J
set phase 0& @5 c$ Y8 C6 X" D0 s6 g) u
set num-cars-stopped 09 \0 P7 P. |7 |2 C9 m% ]+ M
set grid-x-inc world-width / grid-size-x; l) v& L5 o( N- _7 z4 X3 S& o: c
set grid-y-inc world-height / grid-size-y% o R' y. @* }- c6 l% Y$ N
6 E+ n& p/ y+ x" y ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
. j" }9 C u& o5 Z' u+ Q set acceleration 0.0991 Y" d/ {5 X; H: N( c$ x
end/ C0 o1 M" h, E% e- L
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
5 X' c o# M" U) U;; and initialize the traffic lights to one setting
4 O' X {) @ t' tto setup-patches
?, T7 _+ ^6 Q J4 {. T; k& m3 M ;; initialize the patch-owned variables and color the patches to a base-color
3 o" |) u" B5 W# y) R& M ask patches
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9 H$ `$ o q7 V Y [" ] set intersection? false7 ?% _; U8 L X
set auto? false
* x) p9 N; u2 C# T, f- H- y/ b set green-light-up? true4 x! x. }0 h7 C: T8 v
set my-row -1
+ g, q) ]3 x2 D+ A# I+ N* O8 m4 T set my-column -1' t3 j7 T6 k: t; B) r- Y9 g
set my-phase -1% J: @+ ~1 Y# Y, N
set pcolor brown + 3
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0 w8 T j, o7 [! {1 _ { ;; initialize the global variables that hold patch agentsets5 B n! t! v6 V8 R. i# }( ~
set roads patches with) D9 Z7 A; Y% c- ^7 w
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" y5 ?3 ]$ Y3 q! Z2 G
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 f3 }, U. N' A4 r8 [8 k+ K
set intersections roads with
/ P# l4 W- I6 c3 |+ k [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and: D2 V A8 }& w8 E6 P9 Z ~" e
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* ~8 B6 J# P7 F6 S, L
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ask roads [ set pcolor white ]
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* K! K& `, e+ Z* L/ O/ m7 {其中定义道路的句子,如下所示,是什么意思啊?4 f; d$ v: d+ E8 G
set roads patches with
" c2 j$ V2 ?; g, _0 C [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 W1 U! n& ?; e `. b! I& K9 D& _' j (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 H' P" |1 ?3 t' J* h V& w1 q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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