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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。
; Q+ g& i3 i* `7 W8 F. nnetlogo自带的social science--traffic grid这一例子当中," y1 h+ d# R0 T$ r- O. D. g% l/ P. d8 K
globals/ R% D% N& [4 e5 H
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1 E2 l! X; \4 J$ [ grid-x-inc ;; the amount of patches in between two roads in the x direction4 K0 `" C. R' L& P* |) E% Z; p
grid-y-inc ;; the amount of patches in between two roads in the y direction
$ p2 f' F) `) o& P acceleration ;; the constant that controls how much a car speeds up or slows down by if1 ^4 X0 N; E; ]* V* ?0 f
;; it is to accelerate or decelerate3 w1 p4 M' F) |3 g+ {+ [
phase ;; keeps track of the phase
& i: V# `" P/ s num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
6 [' I+ f( |4 \. M& U8 V5 r( p current-light ;; the currently selected light; c' E3 Y3 @3 D' S0 _6 v
$ Z% p9 \" J$ m2 P. Y Q2 @ ;; patch agentsets! ^1 V. [. |3 N
intersections ;; agentset containing the patches that are intersections0 L& r g5 H6 p- e
roads ;; agentset containing the patches that are roads. o4 C5 r9 ~- M3 Q
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. ?( Q/ \. B; M6 o( n5 Aturtles-own
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9 S6 q l# }7 V; x. ?0 T G- Q speed ;; the speed of the turtle
) P' ?* ~# r* \9 Z/ w: U9 W up-car? ;; true if the turtle moves downwards and false if it moves to the right% g, b/ H7 n/ n* z" {/ ]
wait-time ;; the amount of time since the last time a turtle has moved4 w( F3 [0 T3 O
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3 d! ]9 v# |1 D, Kpatches-own
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* X/ p$ d+ s ] intersection? ;; true if the patch is at the intersection of two roads
7 e( N, ]( u9 }8 x+ q green-light-up? ;; true if the green light is above the intersection. otherwise, false.
/ i4 ^: ]7 j, t( N9 O ;; false for a non-intersection patches.* P; F, e9 a" j6 `# f% d) F+ c
my-row ;; the row of the intersection counting from the upper left corner of the
0 |% K! Y6 t- K' H6 u ;; world. -1 for non-intersection patches.
0 T @. H( s2 M my-column ;; the column of the intersection counting from the upper left corner of the; b5 ^, A4 l' O0 h9 O+ L: r
;; world. -1 for non-intersection patches.% w7 ?, Q! Q3 A
my-phase ;; the phase for the intersection. -1 for non-intersection patches.) T4 C, R% K' k
auto? ;; whether or not this intersection will switch automatically.
' N! v# @# L- [6 A' U. e ;; false for non-intersection patches.
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% k: R' e) w( j, |7 O/ D. x) l2 \;;;;;;;;;;;;;;;;;;;;;;
# C# G. T, A* N% d* d* v;; Setup Procedures ;;; T! s( R: m. m. i6 D- \
;;;;;;;;;;;;;;;;;;;;;;
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, ]4 r% i7 L9 D;; Initialize the display by giving the global and patch variables initial values.
x( t( X i0 s- w; J0 Z;; Create num-cars of turtles if there are enough road patches for one turtle to
, ~' e3 w1 v& e;; be created per road patch. Set up the plots.8 b, O2 |2 V8 j( |
to setup! o/ {: ^$ V! S# d* v/ b; d4 X( G
ca
( M: ]* y T8 [" Q6 h! @ setup-globals0 i: Q, B4 W, [/ G# t9 ?; c0 `3 [
% ]9 v0 f! w/ S# q5 A4 \ ;; First we ask the patches to draw themselves and set up a few variables: ~. }8 O( h/ A- @0 o/ E9 c2 A, a
setup-patches
5 {2 s9 v$ j$ t; s) J make-current one-of intersections
: x2 |7 g% x ~5 G8 _1 e label-current
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' S$ c; d5 g0 W5 u! D, L# P2 w set-default-shape turtles "car"
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: x8 j' W. S, _5 f1 | if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
$ o1 |7 W3 g( o% ~8 v! D" ?7 b "road. Either increase the amount of roads "
9 `* y# m- b9 H) l& t9 r& W "by increasing the GRID-SIZE-X or "3 N. L o5 S2 C% U8 L
"GRID-SIZE-Y sliders, or decrease the "$ c) ?9 c' a" u a/ V
"number of cars by lowering the NUMBER slider.\n"
3 d/ N3 e& ~& N9 V "The setup has stopped.")
9 X+ M+ ]8 o5 f4 Y' q5 W stop v% N# ]( u/ |" z
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a$ w, a; B+ N6 c- {. B ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
/ s. L2 v( P7 E& z* M/ T crt num-cars
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setup-cars. Q% X# Z8 d9 b0 a5 [
set-car-color
# H4 F" H8 b8 o4 q1 Z$ R! ~ record-data0 r" o# X% V! c# U' z4 ~2 Q
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;; give the turtles an initial speed
; ~! ^( J) M+ B ask turtles [ set-car-speed ]
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* L. g, i \8 `5 l& i% K reset-ticks6 h) p5 J- X D$ D$ b }1 x
end. f8 r2 Y( ]' g6 Y2 S3 }2 s: D' ]% h9 Y
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;; Initialize the global variables to appropriate values
& K( o1 w. a+ `8 p3 }to setup-globals
3 }+ g9 u" p9 @& Y: {: ^8 ? set current-light nobody ;; just for now, since there are no lights yet
1 Z) }! I4 h3 J& E' k) u8 C& N set phase 0$ K. ?+ O0 ?5 V7 c/ ^8 l, M* Q% B
set num-cars-stopped 0/ r. Y' n7 y- V6 q! C8 ~/ S
set grid-x-inc world-width / grid-size-x
$ V4 S; L' O. c; Z: i, S4 E set grid-y-inc world-height / grid-size-y9 q+ w. ~$ d3 ~
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary: b6 \$ w6 z7 d8 |
set acceleration 0.099, o* `! Q- K6 Y7 a$ V
end
, J3 j, l: r) X) s% Y1 W; m! N; p
3 f( k* x7 O8 {8 N& T5 c, n( ?;; Make the patches have appropriate colors, set up the roads and intersections agentsets,, @1 ]# T" ~% A* N" n2 z: G
;; and initialize the traffic lights to one setting; a$ c2 ^- _% F- L' T' p
to setup-patches
* W3 I2 O2 z0 Q" Z ;; initialize the patch-owned variables and color the patches to a base-color
$ e1 T9 @9 y) f& J# h. I ask patches2 V5 ~8 p* n6 ~
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; m$ `- |6 c, v& |7 y0 R! d( ~# ` set intersection? false
' h. ~8 p, C5 M, G" v J set auto? false
1 F9 V$ K) d4 q set green-light-up? true
# A7 Z/ g- J$ c set my-row -1
/ W( f" Z8 \5 V set my-column -1- m# \9 _% g( s1 }' S: V! j
set my-phase -1% x/ ~5 t% z4 g8 |+ B& u
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
& [, t! d: O3 ~* L/ K set roads patches with
' ^. u/ F0 D3 d2 V' @! [. f [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 l( F# D4 L1 s$ a1 K
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 X* J" u m. l" d: T7 y, q set intersections roads with
& k: O, N' Y% v6 a, g: i7 v/ } [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and: b) Z9 z$ j1 C7 k: i. M
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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; g9 X) f) W4 @ c ask roads [ set pcolor white ]# d0 ?9 Q, w( M+ t: V* \4 c# {" ]0 c
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?
K0 Z! w Q% S, V9 ?) f set roads patches with
0 O. y2 U5 Q+ d" R4 y' D [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
( ]' h. P, C3 V0 l* P- W (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& s3 ?, W0 l" X m; 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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