|
|
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 f1 U" B* t) P7 Z2 ^7 dnetlogo自带的social science--traffic grid这一例子当中,+ j3 s$ l7 g6 A* |. P% I/ P# B
globals* G4 f0 w, T2 @- y1 q
[3 o' v' q* P9 S" c! r7 g& S8 y
grid-x-inc ;; the amount of patches in between two roads in the x direction
( N' `7 g0 d+ y8 b grid-y-inc ;; the amount of patches in between two roads in the y direction
7 V7 q; k6 P9 x* ]( s; D% N+ Z acceleration ;; the constant that controls how much a car speeds up or slows down by if
& C. c) c1 y. ^0 D7 E( E! J% O. J$ D ;; it is to accelerate or decelerate M- x d& K8 l! g/ l
phase ;; keeps track of the phase
! F8 Z5 {5 g8 f/ P! o { num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure& F0 h+ @) j8 C0 a0 S! G
current-light ;; the currently selected light/ I$ z* k% I6 ~% g
5 n7 d1 w: c3 J" b) |6 v ;; patch agentsets
7 y: w P8 u. s+ B" ~2 D intersections ;; agentset containing the patches that are intersections' ~% C7 N- T0 C3 |
roads ;; agentset containing the patches that are roads
! S! g+ `9 q( ]* T) V]5 E- d% u+ {$ N9 q4 y
! ]7 H @' {, O. oturtles-own( l4 o1 a; o( R
[
7 x, c; l' O# n: N, W& G) @. T* S) i speed ;; the speed of the turtle- p$ v. @2 k* n. I
up-car? ;; true if the turtle moves downwards and false if it moves to the right
9 ` i/ a% ^4 r c u wait-time ;; the amount of time since the last time a turtle has moved+ n$ P9 R$ f3 S% W' @, ^
]
+ X$ o* w+ f4 [0 G% U
7 y% B. H; i# t, C: [patches-own' g) K1 d& e- [
[
a$ u# p5 `6 Q' y9 K6 y( s% E+ L% [ intersection? ;; true if the patch is at the intersection of two roads! y q$ ]- o1 K3 D4 n/ S
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
1 m8 V' ]( R8 h4 q: i" f ;; false for a non-intersection patches.+ N6 O3 C" V5 z; P3 m
my-row ;; the row of the intersection counting from the upper left corner of the
, u# S7 P T( G ;; world. -1 for non-intersection patches.
" ]% \- b! p' J$ }7 d0 u" x my-column ;; the column of the intersection counting from the upper left corner of the2 V$ {" T# l2 X4 O* h3 g
;; world. -1 for non-intersection patches." h& |3 I, |. {; \
my-phase ;; the phase for the intersection. -1 for non-intersection patches.( Q5 f1 L* ]" }2 p: c6 [( S
auto? ;; whether or not this intersection will switch automatically.
3 w, }3 N7 H# l: p7 ^ ;; false for non-intersection patches.2 k4 d# |4 c \- d; |' K5 t
]% _+ r# a7 Y7 ~+ t( j
7 R7 B( _0 l! x) {
( B" s1 M! l; j6 ^3 U9 @! i! g9 M: o;;;;;;;;;;;;;;;;;;;;;;, |4 _; H h. u" ]' G8 t
;; Setup Procedures ;;
6 G; v8 S' x9 Q0 Y;;;;;;;;;;;;;;;;;;;;;;
: R7 a/ G8 b/ B7 O2 B: \; y( t6 J8 j+ l2 a7 v9 m, y! }0 X
;; Initialize the display by giving the global and patch variables initial values.2 D# A$ K2 L* a/ {+ L
;; Create num-cars of turtles if there are enough road patches for one turtle to4 Q3 ]3 z( K4 y" H1 ^8 ?
;; be created per road patch. Set up the plots.& s7 t% d' Q$ {, R0 U) S
to setup
& t) n( q+ m' m+ W& { ca
: m( Y. c& w8 G. Z4 j setup-globals
! ~% x( V! P ]9 U; ]) z8 q' c9 g
;; First we ask the patches to draw themselves and set up a few variables
2 Y+ ^. P+ G4 c# Q# R% { setup-patches
# H0 E' Z4 m( C! T; ]" F8 T make-current one-of intersections
5 L( R5 h/ _+ x) Z% \0 M label-current
4 E5 Y$ |* a- ?, C T
2 x: E4 j* S4 C+ F: F) Q set-default-shape turtles "car"
- o" O) S6 s6 Z$ J. L) P
' H- d; T) Y1 ^2 k* Y8 x% K/ | if (num-cars > count roads)
" |( C: {( f4 }- }8 g9 I [
: e \6 w, h2 b: D. _% J1 l user-message (word "There are too many cars for the amount of "
8 _* y! ~ P* c- J5 ? "road. Either increase the amount of roads "
3 C6 B6 Z2 s3 u9 G5 A( Y% y K "by increasing the GRID-SIZE-X or "
! ?4 D; ~) e |- ]5 t' H0 x" b) O "GRID-SIZE-Y sliders, or decrease the "5 j' v; q( C& r& Q
"number of cars by lowering the NUMBER slider.\n"8 Y8 L/ h' l! x2 \% R
"The setup has stopped.")
( o2 f! l6 t2 S% S. v8 w stop
2 c0 Q6 l" V* x6 O9 ~9 z ]5 d# ?: a- w# F1 \8 F- N
0 V7 z" B; K F" n- F ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color: W3 a8 T9 Q+ I: q* p/ Z7 S* z0 c' Y
crt num-cars
' _6 k, h( c! b/ H5 p: E* I [
% B6 i E& H, G( S& V setup-cars
; H! I6 R" P5 d8 g4 W set-car-color# ^+ y! m; a. h! O' O
record-data# |8 b) ?* h( m
]
! x! Y* _0 q* w7 p# ^7 e \# y1 |4 E
;; give the turtles an initial speed
0 \/ E/ C! s, b) W ~( |6 y# [ ask turtles [ set-car-speed ]
+ K0 r4 v) L. G: d3 Q& Y) i V4 V: P; \8 b' }% J: `
reset-ticks
$ ~: [4 M K6 xend' P/ Z, X, T1 t: k. \* ]* X
% f. L) h! {$ f6 S;; Initialize the global variables to appropriate values
; ?' v* v, H2 u; u4 ^$ g. dto setup-globals
1 u% H. f% y$ G4 |7 k2 V5 R. x set current-light nobody ;; just for now, since there are no lights yet
% J" ?5 P0 {3 T7 ? set phase 0" ~5 D- R/ A9 l7 v
set num-cars-stopped 0# U3 `, e4 B; Q, D; l& s
set grid-x-inc world-width / grid-size-x7 s7 l; s/ I3 @( i5 ~2 a9 `' e9 U
set grid-y-inc world-height / grid-size-y
& n$ W- Y% R. M p1 w9 R5 p8 I0 R7 J5 L2 h# P& M) G$ P
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
- U) M. g- l7 J6 R1 a* Q; ?$ x set acceleration 0.0991 O( O9 a2 o8 f; M$ ]% m0 a
end
I( ^ ~" c! S
$ u& n5 w1 O3 o: A;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
' `: H- K& m };; and initialize the traffic lights to one setting" T8 s' P, E+ i- p4 c
to setup-patches
. |3 W, k0 \4 F4 a/ b' W8 j" B ;; initialize the patch-owned variables and color the patches to a base-color, Q, O2 @3 Y u% [7 {& ^: b/ _
ask patches
3 L( e4 z4 {2 ?, P8 o. a# o1 N [
0 w9 z! k8 _7 \; j set intersection? false6 _" o2 d6 ^# \) g5 Q2 K
set auto? false# o' [) s, _4 [8 H* d9 e9 B
set green-light-up? true
, Q$ p9 R& n; k+ \0 `9 _ set my-row -1
. n* z" O. D9 D1 N( p/ r, J, K set my-column -1
' _) P- ?+ k N3 G( o& H set my-phase -1
# ?) [/ t2 {; F+ }0 V7 B: B G; @ set pcolor brown + 39 Z% x" G- N- N: v' B5 v
]8 D7 |! g' n7 A, f. J( j8 q7 L
; v5 a! w/ n6 }; l8 T, { ;; initialize the global variables that hold patch agentsets Q' d6 N9 v! f* q3 ^# W: g
set roads patches with1 [1 ^; P4 }( s4 {6 P, _
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 u, R% [, ^$ V- b. I9 O& Q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- z' \0 F8 K% |& @
set intersections roads with# l* K# W4 K1 }1 u* J
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and1 q& ^7 n' C3 L' m5 F3 \7 D
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 E% ^8 S( F, F; d) v* {7 m! ]( f- G$ k- z
ask roads [ set pcolor white ]
* K3 E( }% i; H7 k setup-intersections
9 T B3 e2 I% ~4 K; j0 mend5 h9 D& E% t! n$ B5 G9 B' p+ ^5 N
其中定义道路的句子,如下所示,是什么意思啊?, x# R" V/ {3 M3 c, J/ r
set roads patches with* L; Q* J: ? m5 l+ t) `4 X
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; y L( `: ~( w* S+ S# ^3 z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]& w" T( ^8 I" T% Z6 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? |
|