|
|
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。: r, ?" v( @5 t" s2 V( I# g. n
netlogo自带的social science--traffic grid这一例子当中,7 q; T1 q, P# \7 F* i
globals
7 ^ U2 C1 y- C" d9 M[& ?! a& `/ t& s( z
grid-x-inc ;; the amount of patches in between two roads in the x direction
* h1 F4 l% a, B S% w% d9 r! X! ] grid-y-inc ;; the amount of patches in between two roads in the y direction
+ J0 p. o% Z q- Z3 B( N acceleration ;; the constant that controls how much a car speeds up or slows down by if
+ b' d+ n7 o1 R' L, F ;; it is to accelerate or decelerate
6 e" H$ U2 P$ N2 B9 K phase ;; keeps track of the phase
' w9 F6 @" w3 | num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure! s! G& @! o! _4 {$ R9 {: o, D' a
current-light ;; the currently selected light
7 E; t2 w5 B- R" T: L' |% l
0 X: K* k4 {/ @# q+ ^( c3 X ;; patch agentsets7 `$ ^0 b7 V# k
intersections ;; agentset containing the patches that are intersections$ g- ?+ B) x; Z6 a: Z, [( y8 n
roads ;; agentset containing the patches that are roads3 W% N7 u1 K+ u. W# i% w& F r
]
) u; P( C1 W0 w# B( d
8 ]* c- L2 l( x1 U8 ]1 Y4 G* |turtles-own
* h; T% d8 L: Q7 |+ I z" i# v$ K[ s. @, N& ^/ u! w$ Q
speed ;; the speed of the turtle
3 v( s) ?7 c* u up-car? ;; true if the turtle moves downwards and false if it moves to the right( |% [! m. i) ~( }% C3 w2 m4 e
wait-time ;; the amount of time since the last time a turtle has moved
, O/ U: w( T# K8 ?0 K]2 O2 d& Y& J1 l' W+ N
$ V" T! w( G& @/ p2 V' F) b& ?
patches-own3 Y4 k8 I' d- E1 T/ j
[
) k$ z) y2 |$ C9 p. {* n' H1 r) p intersection? ;; true if the patch is at the intersection of two roads
: U5 x% j3 C I* p green-light-up? ;; true if the green light is above the intersection. otherwise, false.7 U& }5 W$ }$ T6 t A( a& I
;; false for a non-intersection patches.- }7 Z+ j4 |% ]* Q8 m7 l1 K
my-row ;; the row of the intersection counting from the upper left corner of the3 M9 i/ B( z* ~% }( `3 m9 r! |1 x
;; world. -1 for non-intersection patches.
2 [% K5 X( o1 k3 g my-column ;; the column of the intersection counting from the upper left corner of the$ ]! x. e! m; m) i* a0 k+ q( O
;; world. -1 for non-intersection patches.2 O4 Y" w4 O! {! U S1 p
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
' u# H* Y' Y4 T3 R* S5 t auto? ;; whether or not this intersection will switch automatically.; b9 a3 j9 Z6 L* d
;; false for non-intersection patches.; k1 x# s* @: l9 C7 w1 R
]
5 g' r3 M9 Z; C. W6 Z
9 L( C3 D; R. v" U2 H1 J. S, i+ p; v& A& S% i% j& Z5 _0 `
;;;;;;;;;;;;;;;;;;;;;;
7 P/ p0 ^3 v" Z1 q; G# ?2 M& r;; Setup Procedures ;;9 I* @4 P8 M3 o9 f. g
;;;;;;;;;;;;;;;;;;;;;;6 P1 }6 o9 c4 h; u7 |/ ~6 l ?
1 [8 K. A/ Y' R% p7 q! Y% y
;; Initialize the display by giving the global and patch variables initial values.
+ a! x- H5 C* v( Y, j* i;; Create num-cars of turtles if there are enough road patches for one turtle to6 a# \# q R) w) M% o
;; be created per road patch. Set up the plots.5 c8 \) D8 P# p5 R; P: S2 ^
to setup
u% R B0 {( \4 G6 ^( t7 W4 ^+ ~1 D& t ca0 J/ h6 b1 C% Q0 K7 L/ f
setup-globals
* _; w: `( N, X8 W6 c
* R! t% k% t! V; `7 P% X ;; First we ask the patches to draw themselves and set up a few variables
) K* B+ W8 g& u6 ^! K* ] setup-patches( j9 c7 \3 n: K! V* Q j/ b
make-current one-of intersections
0 i) N& P8 |6 \ label-current- h8 D G! g/ T$ L9 e( B( E' I
" y3 I7 c7 P7 o4 {! j' e
set-default-shape turtles "car"' K! {4 q3 p- P% t# ]
' {4 Q4 E9 q% Z( a, L. d% n
if (num-cars > count roads)
% c0 S5 u @! L8 [' D u [
$ I k' p: d+ o* D8 T4 n& Q user-message (word "There are too many cars for the amount of "" C2 R, o0 m. @# h) m! {3 w6 y
"road. Either increase the amount of roads "3 _1 l; Q* a7 ]: k9 j( g
"by increasing the GRID-SIZE-X or "
5 y8 `" e9 `" w. W4 B "GRID-SIZE-Y sliders, or decrease the "$ L0 c1 ?+ O% j) W& f# y1 f
"number of cars by lowering the NUMBER slider.\n"
& W9 K0 j% S0 r, y "The setup has stopped.")0 r3 `/ h& t8 N; y
stop
* n7 q \' @& L0 U) w ]
& \# x0 x/ f3 H+ q9 i) Z
7 o; B4 X+ h, k% b- l: G ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color* ] x J* `2 o' C
crt num-cars! f' o( v( P8 u3 d/ [
[% ]) p8 e( j4 N. d- J# Q
setup-cars. Y8 I- Y" N% ]( H0 p: I+ t
set-car-color
7 L( i5 o2 J* z5 T record-data
: _# m, x3 W- I ]$ B; V' C9 `8 ~
& D. y8 W% J6 a! I4 j+ T
;; give the turtles an initial speed# T' j, d' T7 g/ f- ~- N6 q) n
ask turtles [ set-car-speed ]* s) D/ `1 g6 I& \. d% [4 \) V! T
/ y3 K) d0 u% X# V
reset-ticks/ n3 U* C! G- d' }# L" T( B( A" e
end
. r$ a3 i4 G+ z9 O0 ~+ i; m7 s7 U0 Q9 b4 q6 D) C
;; Initialize the global variables to appropriate values
; q, I n$ `% R, v$ Oto setup-globals Q- W* i* H8 L' S, d
set current-light nobody ;; just for now, since there are no lights yet+ X1 m c9 o& A% c7 i
set phase 0
, Y1 I/ Z+ r+ j) V set num-cars-stopped 0% ~' [! s+ y" D Z0 h% B
set grid-x-inc world-width / grid-size-x
6 o4 p$ e/ J+ X set grid-y-inc world-height / grid-size-y6 v% _- @- ~9 _! m
+ X' ?( _0 @# O. c/ P( S
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
( D- G, y+ t; i% T' K9 b set acceleration 0.099
/ _. `0 R% w2 H3 p5 r$ E$ ?. K. C8 w$ }end
( l6 Y( e% y5 p* h/ S: h$ _7 i I" }; y2 j, a8 h* m
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
, [# u, `9 ~- Z4 c1 v7 t" t;; and initialize the traffic lights to one setting7 u9 m# E: {1 l$ G
to setup-patches3 N+ U9 u# x5 y
;; initialize the patch-owned variables and color the patches to a base-color7 ]; P/ n, [" x: {# Q/ I ]. T
ask patches* m. o3 A2 P2 [3 l) q( ]( a- P
[6 a7 }$ g0 @* ~# j1 n6 p
set intersection? false
& r9 ]& O# U; |8 Z$ ? set auto? false
9 L |6 A" b7 a/ |+ Y set green-light-up? true
% O4 `( x8 }( c* I$ S, Z set my-row -17 q- X. E5 f) X5 a
set my-column -1
: n) [! k/ M) _ set my-phase -19 h/ n; X/ ]! i, m
set pcolor brown + 3 y) p7 v/ O7 T
], p+ T% j3 `0 [( z, T- f" X4 V
$ x" q6 ]. G L& G! ~' p [2 y
;; initialize the global variables that hold patch agentsets
; l6 S# q5 u7 E$ Y+ v set roads patches with, T% l3 `3 ] j$ F% Q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 ~2 o" ?& y3 C) r t/ p. o (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: N) m5 o4 A7 F
set intersections roads with: ?; N6 r+ P! N
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
( p7 }/ f; ~$ P4 n (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ @# }4 j; x% ?: g5 U4 ^9 C! ~4 {& O. B: c, w, X. x
ask roads [ set pcolor white ]$ D" |; V, [! `' [5 v- a b
setup-intersections
4 ]3 Y% ^9 K% ]) \; k0 B! mend$ c, i" F1 F/ E7 b' m3 `! s. `% Z
其中定义道路的句子,如下所示,是什么意思啊?1 p2 s) k/ X3 m% n3 u6 C
set roads patches with
, e6 H$ y( Q# e0 G [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. Y! F$ X! Z& z+ G
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, V4 c0 x1 D; X! F9 ~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? |
|