|
|
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。
8 D; n# K7 `: U; _netlogo自带的social science--traffic grid这一例子当中,- K! ?2 S; `& j Q
globals a6 c* R& r. {6 f
[
5 X- @) o3 L4 Z2 N4 u- I k grid-x-inc ;; the amount of patches in between two roads in the x direction
, c8 |/ R+ h) F+ S1 z grid-y-inc ;; the amount of patches in between two roads in the y direction
0 I) r. N# ^; C, S+ q0 ]) w# ^ acceleration ;; the constant that controls how much a car speeds up or slows down by if
8 Y o3 S: k+ r6 E ;; it is to accelerate or decelerate
, ?: t& S! J3 } phase ;; keeps track of the phase
6 K& k# M$ _! j% A& R num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
, H0 \2 W4 ]6 p5 K, \9 i current-light ;; the currently selected light" w$ C5 \$ n, Q
9 r3 B9 H2 @; q# y) l [ e ;; patch agentsets
' H4 h2 A8 ~( _ intersections ;; agentset containing the patches that are intersections+ o9 j* I0 t( G Q/ c% s
roads ;; agentset containing the patches that are roads! A" U, `6 l) r6 W6 Q
]! \& l# u4 E) P. _ x4 h/ g
0 R8 O8 B; o: E9 Z7 t* Y+ {+ Dturtles-own3 K- j4 m) s/ a- U6 w }3 O
[
) f& m0 h, M L$ d7 L2 a3 R: d! P speed ;; the speed of the turtle8 E- m5 _' u5 {
up-car? ;; true if the turtle moves downwards and false if it moves to the right- C3 Y* o; x& y5 ^
wait-time ;; the amount of time since the last time a turtle has moved
" q- K8 {$ V4 c* I7 r. |# T m% f]- P" J7 W7 s) c9 v4 g s! G% c
! J# V- H6 A- H+ s7 j9 Apatches-own2 t* [7 c- h! ^( P8 j1 F
[0 F5 ~1 E; c( E* R" S
intersection? ;; true if the patch is at the intersection of two roads1 a f+ M7 [% N& D, D' \4 y
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
& b- f# F- S8 [: u3 z/ h9 d& j* w ;; false for a non-intersection patches.
4 M3 P) S( X2 w9 W6 Y my-row ;; the row of the intersection counting from the upper left corner of the
# \& J/ ~' s/ m; g ;; world. -1 for non-intersection patches.9 z! n6 _7 E$ i8 g# v
my-column ;; the column of the intersection counting from the upper left corner of the) ^7 q% L( B: n) x) w
;; world. -1 for non-intersection patches.( S3 ]+ F% G+ ~5 g% c0 C4 O
my-phase ;; the phase for the intersection. -1 for non-intersection patches.* Q6 A0 k3 K8 x' x3 p9 q/ ~, E
auto? ;; whether or not this intersection will switch automatically.+ G$ R$ s1 j1 U7 z$ `" {6 b; `
;; false for non-intersection patches.# {0 e8 t E5 R9 A$ }+ Y- |
]
" \/ Y* y8 i( l; J& O
1 S" ?$ S, @$ [1 \8 M t! y5 d
# [1 _; v3 Y) y3 F7 W;;;;;;;;;;;;;;;;;;;;;;& W2 G. R7 m2 S2 B+ J0 }2 m
;; Setup Procedures ;;
" I8 m' u) ~$ _+ Y;;;;;;;;;;;;;;;;;;;;;;
7 T; f' l7 o; [, @
1 V; n, {7 F/ S& r# Q: e# O;; Initialize the display by giving the global and patch variables initial values.) }3 G& z0 q( ~7 b# b/ j
;; Create num-cars of turtles if there are enough road patches for one turtle to% g0 ~/ T+ T5 x5 b$ P7 ^+ N5 [
;; be created per road patch. Set up the plots.$ v1 J9 Y; V% d/ a* `$ V
to setup
4 a& N! ]3 _7 f$ w+ B6 ~9 v# y ca8 }( L* l) e8 w
setup-globals4 F, M1 q' E* R8 J+ Z
" L( Z2 h0 e8 ~% l$ \0 C# } ;; First we ask the patches to draw themselves and set up a few variables$ }* V$ R+ p, u @# F: e0 \0 d6 Q
setup-patches
1 n. l) e V2 }& i. v make-current one-of intersections
+ |& T, P2 R: } ~0 r# V3 R label-current3 T# q& }5 r( Z) ^7 y
1 {* Q1 d4 k* u% l K2 o set-default-shape turtles "car"& V& b( H( M# {' P
9 Z, t8 U4 d; Y; w1 F+ y0 C
if (num-cars > count roads)) E) P' {7 b- T- e% @( N
[
* u9 I& z9 G5 t user-message (word "There are too many cars for the amount of "
S( r4 {9 D! i3 [/ Y5 W, e "road. Either increase the amount of roads "
' d* b* }, x# Y7 f "by increasing the GRID-SIZE-X or ": I4 d3 l, t5 z) V
"GRID-SIZE-Y sliders, or decrease the "$ i! b7 d5 l9 }0 d7 O9 v/ s
"number of cars by lowering the NUMBER slider.\n"
9 F( l) @0 c7 J4 Z, Y( f+ a/ E "The setup has stopped.")
& [7 {7 ]" S9 C5 d- w( Q- E stop( [5 R9 {2 K, j$ Q! z, M. H
], g0 C j$ |3 N' L" I# v# u5 c. q
* B1 q+ j: L1 k: F- z9 G ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
1 i4 g b8 `- X/ m, h d8 G crt num-cars
s6 Q; _; w! |, b; Z [. u8 J; W. Y% y
setup-cars
$ h# D5 F" d" @; e' A set-car-color
$ ~/ U' n0 E7 \5 ?4 g record-data
, J$ Q& w7 \% x2 l ]
+ s* C: z) r3 W
# p3 F, g9 S% I" ~4 X- D0 G) |) \; o ;; give the turtles an initial speed
" g9 X$ K, O$ i ask turtles [ set-car-speed ]
: a9 u. M5 j) I: @; f
1 S! h$ r' d/ @: s' | reset-ticks
6 { \3 ]2 Y! ^0 r6 c. g* t2 ^% Kend
, M6 N. q) w8 q. T z i- Q9 d9 V
;; Initialize the global variables to appropriate values( R* a, H/ p' C, P+ ~; G
to setup-globals+ C1 l g1 W# i3 Q- h# P* H
set current-light nobody ;; just for now, since there are no lights yet
- e4 x: o) \2 ~( B% b7 J* } set phase 0
7 x( B& H& u/ r. d3 W5 T set num-cars-stopped 0
; y2 v2 t1 D1 ]" S9 v set grid-x-inc world-width / grid-size-x. A D& c2 N! M$ `9 o
set grid-y-inc world-height / grid-size-y
, H* J1 c2 l5 u, U" ], r/ T4 @+ R- L3 d: a+ ]7 w5 K, s
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary( i4 {% D" ~' f, w# U6 T. V" Z. @
set acceleration 0.099' Q3 {+ E" A8 c1 W& E7 O
end
1 O a9 w9 Z( ~( R) F# H& i% ^+ P2 i+ _1 {
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,( p4 s* |4 V: `3 T# B
;; and initialize the traffic lights to one setting: e3 V% i; a( o
to setup-patches
! ~+ v! V5 J9 L ;; initialize the patch-owned variables and color the patches to a base-color
5 _7 v0 j" K, J( D- H, l ask patches" Z. c) @2 Q2 O( j% e
[6 K8 E& q& j/ l
set intersection? false. K2 E3 N3 Y$ K- t* k$ ^6 h9 @1 D
set auto? false
1 h. G0 ]1 {0 G set green-light-up? true! Y7 r( ^/ @8 l& `) ?: W: l' b# y
set my-row -1
6 w7 P: W8 W. _+ P3 E4 ]- D; P set my-column -1
/ I$ q& j! B" H3 U# `! J set my-phase -1' _+ i1 K" Y+ O. X, q
set pcolor brown + 3
1 k7 \2 `$ }/ v ]; N p0 }$ t# s3 O* S$ [
( I. O2 Q6 b! L, T* Z& @) s ;; initialize the global variables that hold patch agentsets
7 `6 W' [0 ]4 T5 o, n set roads patches with
3 \' c# S& J ]5 _ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& c( `. g& C% v* z6 C% J (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 ~: c4 g% a$ T9 t% ?$ m set intersections roads with
( o$ v9 Z# F; l# J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 v0 J* G" t0 f( ~7 y3 y+ t (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ @! S9 D) c- u6 V
3 A; Z/ }$ K) p& v" d
ask roads [ set pcolor white ]3 E' k+ h r; a$ ~/ ^
setup-intersections
x' b* n3 W; g0 |$ I+ H' \$ |0 Nend/ @" @7 `5 U6 {% i' T4 S
其中定义道路的句子,如下所示,是什么意思啊?( b( B7 G+ ^% w- Y1 K( I5 y
set roads patches with- c% m. g: c- h' E: \; a
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) p7 a$ F, N$ r7 [! ]+ V/ N. ~
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ ?9 T% T3 d1 y* F: t& \: a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? |
|