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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。
( e1 Q/ v0 O# J% }$ xnetlogo自带的social science--traffic grid这一例子当中,4 X- \' U7 P, Q
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
9 ^$ Q" ~5 S9 L1 s, c grid-y-inc ;; the amount of patches in between two roads in the y direction
: u, i# `' }0 M! j acceleration ;; the constant that controls how much a car speeds up or slows down by if
i; e# j# D" n2 e$ [( o ;; it is to accelerate or decelerate# w' A4 r$ h; x; T* q) Q5 v
phase ;; keeps track of the phase+ \7 @. B7 Q6 x; [- t. ?
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
% Q. F8 ~- r# ?# G, s0 S current-light ;; the currently selected light
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# k: [) V& s) R4 l, V+ S8 N$ O$ y ;; patch agentsets
/ @8 n- L# t5 L/ x intersections ;; agentset containing the patches that are intersections L+ o7 r. u4 ]: N" k2 Q$ r+ P9 L
roads ;; agentset containing the patches that are roads& B; o: z9 O G6 ]0 A1 t
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turtles-own
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speed ;; the speed of the turtle8 _; p$ g4 Z; ?5 C+ [
up-car? ;; true if the turtle moves downwards and false if it moves to the right- k1 u4 v6 n g J7 ?4 u6 U, u
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own" j) |/ t. w& d1 }. }7 G4 O; `/ W; `
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6 H& [" R( t. M2 V# p7 q; o intersection? ;; true if the patch is at the intersection of two roads
, Q- ]5 {; a Q5 ]3 z8 D green-light-up? ;; true if the green light is above the intersection. otherwise, false." c' C! S$ i& k1 v
;; false for a non-intersection patches.
" a/ {! R+ P3 t0 [. s* @" C my-row ;; the row of the intersection counting from the upper left corner of the
5 {$ h6 v% H( j ;; world. -1 for non-intersection patches.. V9 d$ a* n- a: p/ b; v
my-column ;; the column of the intersection counting from the upper left corner of the, h' M: V4 V1 q+ d% j7 H
;; world. -1 for non-intersection patches.
/ m2 }4 w9 L. r& E my-phase ;; the phase for the intersection. -1 for non-intersection patches.
# [9 }" q! i. @: A) B auto? ;; whether or not this intersection will switch automatically.% {+ c/ U6 E$ G7 g5 K6 u. o
;; false for non-intersection patches.8 H9 A: A) f; N e4 D/ C: y
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$ z# s* L& U7 x g& v+ Z8 i, V;;;;;;;;;;;;;;;;;;;;;;
z/ u8 I0 q! {$ Z; T! A;; Setup Procedures ;;* H9 H1 U' o! Z2 _0 `" g- r
;;;;;;;;;;;;;;;;;;;;;;6 p8 U7 X/ b3 a3 F" r' J1 Q/ K$ f! x4 C
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;; Initialize the display by giving the global and patch variables initial values.
: u& d5 y, x6 j9 m8 @;; Create num-cars of turtles if there are enough road patches for one turtle to
: e/ R/ [8 C! n- h8 Z# A; g8 h8 q;; be created per road patch. Set up the plots.6 O2 |$ _0 d/ q, m% }
to setup- U, v0 C) O% y
ca
* |" ]- }9 Q7 D1 J- z; _ setup-globals
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;; First we ask the patches to draw themselves and set up a few variables7 s0 v% d; M7 t' x& a
setup-patches
' D/ \. _3 V' w6 j( B) ]1 x; c# n make-current one-of intersections! n3 w+ v3 z$ O8 i* X0 N: d! r0 x A
label-current' \( r, S- r6 W: z, I6 Z" }
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set-default-shape turtles "car"$ e4 u9 C+ N1 t4 J' @
+ B$ w, o/ D" J6 A9 Z if (num-cars > count roads)9 L) v4 c2 c1 i4 z
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user-message (word "There are too many cars for the amount of "
. s; B2 H3 @% F; o4 d "road. Either increase the amount of roads "* _5 l" G0 i. x) \5 s; O9 x0 m
"by increasing the GRID-SIZE-X or "
: A8 f& ^) f7 R$ C7 s4 A "GRID-SIZE-Y sliders, or decrease the "
- j: T% A: ^0 Y "number of cars by lowering the NUMBER slider.\n"
) q2 p1 i3 a9 S6 ^3 _ "The setup has stopped.") A1 N6 R; ?# J3 T Z9 d
stop
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W2 C! c+ ?; g" K \- k ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
$ \$ g4 S% H) t/ a R$ U) t crt num-cars
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setup-cars- u6 z( u6 `, N- Y0 S
set-car-color
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2 c$ M6 a: ~/ |9 z+ \ ;; give the turtles an initial speed
1 j. P( W, _# _$ v ask turtles [ set-car-speed ]
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# }+ D+ l: ~ W3 k$ O G' b9 E reset-ticks) R) N: h) V; ^2 [! ?: L$ F
end2 o( B- X& O8 z
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;; Initialize the global variables to appropriate values |" k5 {6 S4 Z
to setup-globals
! J, i; ^& J$ r: J" T' E6 R+ d7 \ set current-light nobody ;; just for now, since there are no lights yet! R# Q2 D [5 A' b7 C/ p
set phase 0
6 `% @: [+ i8 k( K( W set num-cars-stopped 0+ z2 Q- [7 S6 `
set grid-x-inc world-width / grid-size-x
3 } X( q" F- |; m, q: O/ x set grid-y-inc world-height / grid-size-y' g) C$ O9 [2 a4 p3 Z. w
* Q/ M0 M- w7 `! |/ b ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary$ t5 q# h1 I/ ~
set acceleration 0.0999 M, O3 H6 { d4 Z& C4 W
end7 F( w/ ]* o5 { P+ a# z
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
! V" Q1 L2 d/ d7 p+ n;; and initialize the traffic lights to one setting: o3 _, J8 D0 d5 j7 l1 }# \2 r% Q9 z/ `5 A
to setup-patches [4 F1 x9 }/ e+ e( U/ U
;; initialize the patch-owned variables and color the patches to a base-color
' L( d+ o/ d- n( t5 w# Q# V# B0 g ask patches
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set intersection? false8 G; I% @: I) o, B% h
set auto? false+ U$ d: [% [& X8 ?# G: d5 u
set green-light-up? true
. ?, q* u2 T; s( i set my-row -1
3 Z6 B. \4 C5 s, z2 A. Z set my-column -1& M) Q+ |- l- N+ l8 X" i4 J- b
set my-phase -17 H' D1 ~1 E$ T# c
set pcolor brown + 3$ n! N& ~! j: t i7 U, Y/ q2 [
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;; initialize the global variables that hold patch agentsets
& q0 g" r6 Z) K! c set roads patches with
! `' t X( W% X- Z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or* ^" U3 \! r( W: g) ~8 \, I
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 W1 g8 \5 r5 `+ s% [ set intersections roads with0 H- S" z' H5 i8 q9 Y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and0 l, _: c1 g$ m
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]- k4 t7 ~! n" v
' w' g' j( H7 Z) i ask roads [ set pcolor white ]2 B8 i' R/ T' ?0 I5 y
setup-intersections
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$ Y4 M s& q5 N( Y4 W其中定义道路的句子,如下所示,是什么意思啊?: D. E' P! d3 ]
set roads patches with/ W0 ?* n( {- o [1 b
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 D. ^4 O' [( y/ w7 N
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 x7 F# T! b M% C% W( E2 \
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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