|
|
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。
1 V6 m6 Q& d8 w2 v! bnetlogo自带的social science--traffic grid这一例子当中,
# S/ A1 j8 w) J1 o& B- F7 Aglobals6 V0 @* @. Y _. E; Y4 X0 e. y8 {
[2 x5 T, }" J R6 `! x
grid-x-inc ;; the amount of patches in between two roads in the x direction0 ^4 y! T4 u* W: ^' {2 E8 }
grid-y-inc ;; the amount of patches in between two roads in the y direction+ t- _5 S; E+ ^" q9 @
acceleration ;; the constant that controls how much a car speeds up or slows down by if
9 @7 c, R7 Y7 f3 j/ R ;; it is to accelerate or decelerate
, N5 s% E( Z2 x* o$ a9 U/ I phase ;; keeps track of the phase
+ R% W7 d4 N. U! D% B e! ^ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure0 x1 N0 T* B% I3 V! {
current-light ;; the currently selected light
6 P/ g; r( `; W5 k0 ?" A/ |! t* w# s$ \- R# @1 w/ e
;; patch agentsets9 X; Y8 e3 L, W
intersections ;; agentset containing the patches that are intersections5 F- s# g4 b( X) G
roads ;; agentset containing the patches that are roads3 n9 n j% X6 s4 c
]
Z0 Z3 w z; Y- F) m" \' g& H* I# U7 {. D! f# Z
turtles-own0 k3 L+ v" J6 z/ k
[
' g* P& a2 [! P! d/ @' `4 \8 h speed ;; the speed of the turtle
; R g2 H2 v. I up-car? ;; true if the turtle moves downwards and false if it moves to the right
/ g# r$ [8 V4 A1 @: H- }' C wait-time ;; the amount of time since the last time a turtle has moved
- c! W6 Q. N6 G- L4 u& A]
g6 _, L# X( d! T) n& Q* o# p" D6 y. a2 R# x1 z
patches-own
- Z6 |' a5 O8 F1 i& A$ S[
1 x; j; M# q) \9 \# G$ x% l6 ` intersection? ;; true if the patch is at the intersection of two roads
0 e, x8 T v) e4 e% ~( s green-light-up? ;; true if the green light is above the intersection. otherwise, false.
$ O& T! L! Y: K0 U* B3 j ;; false for a non-intersection patches.
2 X+ u1 @; m" R/ |" e' A. n: ?* Z2 w my-row ;; the row of the intersection counting from the upper left corner of the7 l2 n) o# y5 Z% g2 l
;; world. -1 for non-intersection patches., B _2 k$ [' e% v
my-column ;; the column of the intersection counting from the upper left corner of the
% P- _( p. Q6 W9 \, K5 K7 f7 K6 B ;; world. -1 for non-intersection patches.4 n# e( x* j" }. M
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
- V( o7 Q4 l! T" d4 n# w9 T. Q5 n auto? ;; whether or not this intersection will switch automatically.$ S6 B/ L' @$ O1 l i
;; false for non-intersection patches./ K# Z( e& p: o' B5 S
]' k1 c. O2 s# J D2 n+ r2 w, Y
2 M5 ?: \7 g" c8 A' q5 Z8 e9 ~4 m
! U, m- Y# s: _% n$ C, ~" i;;;;;;;;;;;;;;;;;;;;;;
8 n, O1 {4 E7 i( b' C;; Setup Procedures ;;' k2 f% q: v' P, d
;;;;;;;;;;;;;;;;;;;;;;
1 ?+ b5 H) }6 Q+ i
: a/ G% _$ ~+ ?) F3 {5 n6 q;; Initialize the display by giving the global and patch variables initial values.! V- q6 D3 X$ i: i( i1 J) ?
;; Create num-cars of turtles if there are enough road patches for one turtle to4 D/ a3 E1 H1 y
;; be created per road patch. Set up the plots.
, c4 o c3 S2 S9 W Bto setup/ _2 z6 A) ]7 f
ca6 p- [+ E3 W" n' A1 ~, T
setup-globals
% v& v3 O3 j( m# o
! C8 V5 \( G) n& f$ y, J ;; First we ask the patches to draw themselves and set up a few variables; o) F c @& {
setup-patches
% u( c( q& K' W* |/ ]1 v8 x make-current one-of intersections
2 @. }/ c. T! I/ F* Q: M L' T label-current
) Z0 \; K* J7 K2 o+ I, L
0 B: h' j! Z: G0 S, y1 ~ set-default-shape turtles "car"
. F5 U+ E0 I& ^ z$ E; H( ^- t) a% [: j$ g# C
if (num-cars > count roads)9 \# n0 j: y5 Y1 V
[, Z" M& K' V- d" k" z* n7 d( H9 I
user-message (word "There are too many cars for the amount of "/ Z2 D l. ^9 ?: i& _& T/ A
"road. Either increase the amount of roads "
. w& A; a' I! |5 ^5 ^ "by increasing the GRID-SIZE-X or "
, L9 Z% K! K$ i2 [& h "GRID-SIZE-Y sliders, or decrease the "
! l$ d* e) _1 S9 r7 B "number of cars by lowering the NUMBER slider.\n"
8 Q( y- U5 I' u) a" Q1 C "The setup has stopped.")1 z3 E/ i) H5 B0 e- E+ U4 ^& Y
stop. k2 O% L7 z @
]
! H4 U6 r+ J5 I3 C% b
, j# K; m w& t$ O" p( C3 [ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
}* [8 G' j9 r' H! [3 M+ y& m7 m# I crt num-cars1 @7 P/ R: ?% q; a H1 l- o
[! \' e# E9 `9 G; {
setup-cars( D8 `! O+ P+ c' o7 b8 ~
set-car-color) A- x8 [- P o% z$ j% P
record-data
, E% D& ?3 f9 O ]! }+ e% V6 T1 g3 a
. b6 a4 K$ k$ ]9 I
;; give the turtles an initial speed6 \ w# _+ C6 Z) h
ask turtles [ set-car-speed ]
/ f6 }8 Z$ N. v7 y( U, Y) Z3 A6 y" D1 [
reset-ticks
& A m+ O; x; l! ~/ p* Y4 P4 mend" D w" r4 W- V! e0 B- {
2 M; h2 [+ z4 s- g$ g;; Initialize the global variables to appropriate values: J3 v( a3 o2 O, C+ ]4 E
to setup-globals
/ R% C' Q# Z4 @ set current-light nobody ;; just for now, since there are no lights yet8 y! \4 J( U5 e% M: D2 {. T
set phase 0" F" E, T+ \5 I; \' b" ]$ l& x2 w
set num-cars-stopped 0
; L5 z" Y% N, S% y$ E7 r% x& ~( B set grid-x-inc world-width / grid-size-x- Z& V. X. P6 r+ i6 T. ~
set grid-y-inc world-height / grid-size-y
, ~8 z* c- T4 n6 N1 e; m4 z3 V# ?: z$ n8 N" F. f$ a2 Q
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary( P7 Z$ v& Z+ Q% }6 W) a
set acceleration 0.099
& o# w( _' L5 w' }8 x6 Vend* e! X) E( d+ |; ]- P5 y
+ ^8 r; v! B4 k$ O! D;; Make the patches have appropriate colors, set up the roads and intersections agentsets,: `' V$ b/ R0 x6 i" N9 {9 s
;; and initialize the traffic lights to one setting4 C2 I! _% b: P4 \% u) W) v
to setup-patches
3 N3 z3 s4 d6 f5 b( K; _ ;; initialize the patch-owned variables and color the patches to a base-color$ v. L& u0 M1 i- c# I/ c4 f
ask patches: R! ~9 P1 {! T9 T7 b) }3 U- v
[
, B( w! v4 @; t1 P set intersection? false
% G( [; o Z1 R( I7 t. { set auto? false
* c2 b$ O' j; X0 \9 b5 ~" M set green-light-up? true
( c6 [8 j* z! z% N) w2 L set my-row -18 J+ q/ {! F7 b- i, p0 J* Z
set my-column -1' U3 `' |/ m% r; n3 {& a
set my-phase -12 `% G, P6 z/ I/ P
set pcolor brown + 3# K5 q) V/ P' f, |
]
( M5 [- W5 Y/ t% J$ H: d, z. X# d3 F+ P* E$ t' G
;; initialize the global variables that hold patch agentsets1 o0 j! P2 s$ t* N( l2 `* b
set roads patches with
. B/ u( V4 m7 ~5 j/ |, }* r8 K [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 I) F% P7 N9 V0 S7 U (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# J' y* o0 H- w
set intersections roads with
3 {4 i6 x3 M% r. ^8 s L+ S [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
5 d1 U+ q. S$ c1 M- { (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 Y) }% ^- H/ d" y- C8 m
5 @. Y1 i5 D8 N: T8 |9 a
ask roads [ set pcolor white ]' Q6 W$ {1 x2 Z- {5 {3 W$ U
setup-intersections
/ k) ]8 X# h% x/ Rend
) V6 {- u N) I% s/ p* z, P其中定义道路的句子,如下所示,是什么意思啊?
* F% S9 }- T% ~; J* m0 P7 h set roads patches with7 q9 n' X( N7 o# d* k
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ v0 r' G$ S, B
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]( R7 q( x: x" [ E: q8 Q
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? |
|