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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。
; x- k, F) \/ ~- |- w0 ^netlogo自带的social science--traffic grid这一例子当中,6 E% e6 G. p% E& y, y9 K
globals0 R7 v& U, W( H2 i8 k, z) k
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grid-x-inc ;; the amount of patches in between two roads in the x direction8 k' N, g3 R% \" z6 M- W% t8 \7 p
grid-y-inc ;; the amount of patches in between two roads in the y direction
0 E/ O# W# R3 ?' p) r9 c' t& d) S( H acceleration ;; the constant that controls how much a car speeds up or slows down by if
{$ N2 S& B; ~1 K' k/ i$ K0 B2 A ;; it is to accelerate or decelerate1 @( `2 p0 Q( z& c( u2 ^( ]; u
phase ;; keeps track of the phase
, D* k7 u4 i# Q6 p% E4 N5 Y' ~8 ~ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure% {9 ]* Y7 M' u
current-light ;; the currently selected light
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" U* I2 D) Z2 ?! l0 _ ;; patch agentsets
2 g! y9 F7 f- d: w3 f' G- W# n' u: Y intersections ;; agentset containing the patches that are intersections
1 o, J2 B% x* m5 p8 Z2 K roads ;; agentset containing the patches that are roads0 [& p7 j; O8 v8 y7 {$ d8 j
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) O, x) l, A4 C% t) Q; @turtles-own" y d) a W: ~
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speed ;; the speed of the turtle
7 g0 v u# K: ] up-car? ;; true if the turtle moves downwards and false if it moves to the right
/ K# H+ r& v2 B" Y6 V wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads
& x9 E1 h3 l8 Z! P green-light-up? ;; true if the green light is above the intersection. otherwise, false.
+ c a/ d/ K" [9 c$ u& b7 E ;; false for a non-intersection patches.. G, U! O0 U% T2 L
my-row ;; the row of the intersection counting from the upper left corner of the8 S& u/ C+ i% a0 r; h: c
;; world. -1 for non-intersection patches.
4 A$ m: G3 \! l5 E! Z my-column ;; the column of the intersection counting from the upper left corner of the6 \! T$ ~0 M2 \" ?( Q
;; world. -1 for non-intersection patches.
) R. v1 o0 S+ _( b" @7 d my-phase ;; the phase for the intersection. -1 for non-intersection patches.! u# B1 r! r9 X. |8 `8 f6 h
auto? ;; whether or not this intersection will switch automatically., s& ^$ q9 |. v
;; false for non-intersection patches.
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. y( A( L. v' i \9 d- v" W;;;;;;;;;;;;;;;;;;;;;;
3 f- a6 ~- F5 f! Z;; Setup Procedures ;;
4 e/ l4 m. K: G, f: E3 p# z0 {7 n+ ];;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.+ d \- E$ Q1 z+ X4 m9 U
;; Create num-cars of turtles if there are enough road patches for one turtle to+ K! @$ V6 z+ `+ T9 y, y: @
;; be created per road patch. Set up the plots.2 F; L. m& L* ^ m" C n8 D& f
to setup: ] M8 ~6 M; u! a
ca
8 Z' q. Q2 D k3 e' x setup-globals
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;; First we ask the patches to draw themselves and set up a few variables2 a8 f2 j( T3 P+ G! V* ~/ y
setup-patches/ S, ^/ {" p7 t' ]5 I5 W, o
make-current one-of intersections
7 j1 _$ j- I" W+ X. X label-current: [2 P6 @+ A2 Q0 g
7 V0 S# D" b) {2 B. `( e set-default-shape turtles "car"( @/ B# m! @! ^ { k# @; l1 }$ E. I
7 ]) U6 u- @- `: [3 s9 n if (num-cars > count roads)
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& a: y! H p1 l* P: l4 E. | user-message (word "There are too many cars for the amount of "
0 ]3 J6 Y3 Y3 s9 E( O5 [ "road. Either increase the amount of roads "
; k# F' R3 x' Q1 S1 M6 [0 n "by increasing the GRID-SIZE-X or "# C% r2 J4 Y2 G7 O2 |" h3 c
"GRID-SIZE-Y sliders, or decrease the "
% ~# x6 o% c5 A5 W4 J" P "number of cars by lowering the NUMBER slider.\n"1 {3 H) U# g* x
"The setup has stopped.")
1 f# H( S I- V% n' ^6 I stop
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8 h7 }9 T- H' B% ] ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
& y0 |9 w Y1 j7 ~ crt num-cars5 Z1 ~0 q. k5 l6 X4 ?
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setup-cars
% u% }5 g$ \: H set-car-color
i# ?, u2 E$ t3 } record-data
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;; give the turtles an initial speed5 l3 _8 G0 ?. n6 H* V* k& l3 M3 J# ]
ask turtles [ set-car-speed ]
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; Y$ o7 C f. _7 X [! y reset-ticks( {2 \1 n* t+ x A
end
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;; Initialize the global variables to appropriate values6 u4 W1 |- V! U- ~4 i! \ h
to setup-globals
. E7 A3 H6 m& m& _$ H. z& c set current-light nobody ;; just for now, since there are no lights yet, V/ e7 ~7 N+ d* l( C. g$ b
set phase 0
6 z/ V0 G h9 N set num-cars-stopped 0
4 O; ]3 f/ E [3 ]# z& k0 f! s set grid-x-inc world-width / grid-size-x \4 p9 t; ^0 c" u0 Y8 S
set grid-y-inc world-height / grid-size-y& e! U3 Y+ k* ~3 V1 P1 C E0 K. M0 V
2 v7 `! Z( q6 z+ N5 q ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary# q1 w2 J5 i# k2 m A$ x8 C( p5 F
set acceleration 0.099: V5 a7 i" c: J# e) S2 L
end+ [# \, v7 Q2 e7 U' \* I
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
* d9 F# a; E4 i0 Q0 {;; and initialize the traffic lights to one setting/ W; ?* T+ g. B; ~* ^
to setup-patches
3 L+ f3 K( N) f n1 V4 y/ p9 E2 a ;; initialize the patch-owned variables and color the patches to a base-color+ F' M: W" V& Z2 r$ n$ H: L3 U
ask patches* e# J7 Q9 \7 ~3 V0 X
[
9 D/ I* e" i/ @ W0 Z* W set intersection? false6 v8 d8 h# A9 e, d/ L& W9 Y
set auto? false) ?7 b3 j" m# B3 w. ^+ @
set green-light-up? true
! C! c% {+ l5 e4 w( z, I set my-row -1
" k( C3 p/ ~* P2 z& | set my-column -1, q! B1 h5 e5 ^8 R- v7 W
set my-phase -1
/ p s# t& [) U* x5 J set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
5 ^% M9 s9 Y5 R set roads patches with5 m- m! _9 M7 ^8 Y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. y" R, R: U% S6 Q6 j7 s, p (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( a: B m7 \+ Q* A
set intersections roads with9 L% k8 e7 l) ^+ |3 }7 J% ?$ {
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and- S$ t. U7 u, T3 t# l/ [4 h+ G
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]" W+ R5 w' R, t' u: o% O# d
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ask roads [ set pcolor white ]
# y6 F+ r+ S2 U' a# `' M9 v( C setup-intersections
! E$ l5 t7 T) c* p7 m- j3 k2 [end
1 v/ Y1 l( E ^; n: k- B2 Y其中定义道路的句子,如下所示,是什么意思啊?5 Z: B% q2 {8 ~0 R) }" }4 }7 z+ i
set roads patches with
3 m/ |2 n# f' p [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: G9 }- j9 H: A, X
(floor((pycor + max-pycor) mod grid-y-inc) = 0)], b( C" Q' i% L* z2 c% \0 Z
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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