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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。
6 `6 ]/ \9 F0 y# [+ Z* h4 a0 m& ?netlogo自带的social science--traffic grid这一例子当中,
2 H* W5 n$ b' {( a3 y: hglobals
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6 T1 G1 w0 ~( i& `9 y* q grid-x-inc ;; the amount of patches in between two roads in the x direction
9 p8 W: y: R; w grid-y-inc ;; the amount of patches in between two roads in the y direction- C" Z2 I& x# _
acceleration ;; the constant that controls how much a car speeds up or slows down by if
8 B- M0 b0 @* ] ;; it is to accelerate or decelerate
1 s6 ^) X, w; I6 ?. a2 `8 r phase ;; keeps track of the phase. g: ~! t) p7 L7 q
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure& |2 p/ k' k& Y- h8 ]. P
current-light ;; the currently selected light
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;; patch agentsets
' n$ l+ m: o( [+ s3 u3 Z intersections ;; agentset containing the patches that are intersections
1 y( X5 a# [% ^) w% r' h roads ;; agentset containing the patches that are roads
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, {5 x& t' x6 y' Aturtles-own
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speed ;; the speed of the turtle
4 K3 Z" F4 o3 @1 a7 |- q4 ` up-car? ;; true if the turtle moves downwards and false if it moves to the right
; S9 u b" f4 e# F' ` wait-time ;; the amount of time since the last time a turtle has moved
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7 B7 z& `. [# z Q1 ]patches-own
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. p9 o( W- r2 \2 _( l intersection? ;; true if the patch is at the intersection of two roads
1 X2 [" \( o. W- H# Z green-light-up? ;; true if the green light is above the intersection. otherwise, false.9 `4 ~ _ |4 \, Z
;; false for a non-intersection patches.( a2 B' q& R' j1 e' g
my-row ;; the row of the intersection counting from the upper left corner of the
* c/ z1 v0 K0 h/ n# Y( a ;; world. -1 for non-intersection patches.6 P9 K2 v3 j( a* p. \! J
my-column ;; the column of the intersection counting from the upper left corner of the4 [6 r2 ^& B: D+ J( v, p
;; world. -1 for non-intersection patches.: ?* F; W# G, E( D
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
! W/ v0 f0 p1 k: ?* t0 y% x auto? ;; whether or not this intersection will switch automatically.
! o2 ?5 T8 D1 G$ w5 X' n' K/ Q ;; false for non-intersection patches.
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" q) O3 ~7 {$ J4 e! e- x w;;;;;;;;;;;;;;;;;;;;;;
( B- o' G2 \8 B; O" [+ k;; Setup Procedures ;;
; C" ]4 E2 A9 s. e3 g, T/ f;;;;;;;;;;;;;;;;;;;;;;
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+ G3 i2 b2 X3 [ O4 _ n;; Initialize the display by giving the global and patch variables initial values.
+ r* X8 ^' {: `/ A' J' U/ ?2 V;; Create num-cars of turtles if there are enough road patches for one turtle to) b, K9 M! |$ O. W6 {
;; be created per road patch. Set up the plots.
& o I8 u1 C. T7 f& ?to setup- P4 E, a, [! u+ }4 _2 d6 q5 @
ca
, k d' J- K9 [. p4 [6 E setup-globals3 @) J" u8 M9 W0 a3 ]
6 L% M; R+ e$ x( E# O8 k2 \ ;; First we ask the patches to draw themselves and set up a few variables7 W. q/ p1 b1 D4 B
setup-patches8 [! o4 q# F: N p# _: z4 e \& C
make-current one-of intersections1 V- ?+ n3 ]7 s6 L
label-current
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$ `1 t) n( d5 A2 ~# `" f set-default-shape turtles "car"
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" x4 y7 j2 d- K7 Q S- h! f- e if (num-cars > count roads)
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% Y# k6 `2 Y6 @( N# a% x user-message (word "There are too many cars for the amount of "
R% H+ _/ F( \" ^2 k8 c* s "road. Either increase the amount of roads "
. u* v9 w1 I$ d; _3 _7 b1 g/ ~+ S& C "by increasing the GRID-SIZE-X or "
6 K( n# L; W# s7 C& c; r$ d "GRID-SIZE-Y sliders, or decrease the "
[+ y" K% o2 |+ G! q "number of cars by lowering the NUMBER slider.\n", I2 r. I; | u
"The setup has stopped.")
; I7 \ Y% |. U$ _5 A# [ stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
: A7 k1 Z' y2 n crt num-cars
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5 p7 W# K L, w9 S4 Q+ m' n- O setup-cars- h: s" ?" h W# ]8 O% y
set-car-color# {. w8 ^4 X j
record-data' P' v) l! M; w7 h. A8 |8 ]: Q
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1 D u ~! v5 d* A1 ~& J8 f' S. \ ;; give the turtles an initial speed
! y9 I+ O! y+ v+ ? ask turtles [ set-car-speed ]& i8 ^) b& W. r$ K2 r
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reset-ticks
$ x( i% {4 \6 b, v& bend
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;; Initialize the global variables to appropriate values5 l5 p( G) y1 P" D: }* Y& N
to setup-globals
! r, X8 H( `6 D; {% } set current-light nobody ;; just for now, since there are no lights yet" H3 r# _% P9 P# O; Y2 y
set phase 0- D [+ Y0 K: @; b! V+ h7 w
set num-cars-stopped 05 i3 R# A" L8 }+ n, H
set grid-x-inc world-width / grid-size-x9 @% Y& \2 c1 t, C; k
set grid-y-inc world-height / grid-size-y
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& |) O' p4 H+ r0 j# Q ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary- R7 I0 b6 ], Q
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
' `. ~, s6 N7 L4 q( A# [, ];; and initialize the traffic lights to one setting
* K* g- d3 C' S1 tto setup-patches* o2 g$ ~* Z" a, h2 y7 l" Q
;; initialize the patch-owned variables and color the patches to a base-color! y" t, }" |* }: q# m
ask patches$ {! ^, F7 \5 Q4 T% A
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set intersection? false5 k) a z$ ]1 j1 j6 z: ^
set auto? false _# k! j) {0 p3 [. w- o
set green-light-up? true3 J ]* d" t$ y
set my-row -10 P& ]- e7 d) ?4 x
set my-column -1
4 {) ?% l b9 T9 E8 n: t set my-phase -1
9 w' O; {3 _$ v6 q I% z- I set pcolor brown + 3/ B7 n6 m2 k7 O8 C
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;; initialize the global variables that hold patch agentsets5 ?9 l% t1 d6 K+ ]6 j0 f
set roads patches with
8 u7 l9 O' t. \, F [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ E" S1 X4 w0 ]. n (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 C% b" K9 s5 g) ?
set intersections roads with
5 R1 J" K+ q# |2 ?6 \ a" Z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and7 |/ I+ o) [* {$ {
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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end$ f0 V2 M( n6 |$ v
其中定义道路的句子,如下所示,是什么意思啊? u) K2 a5 C7 B* X; g
set roads patches with
2 A% c- h1 @& s: q( I [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ Y& J% q" D0 D# O (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# G3 b$ Z {) t6 z/ A, 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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