|
|
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。3 Y6 A% X7 o6 X+ h% S g+ ~( U% C
netlogo自带的social science--traffic grid这一例子当中,, R; W; \! o+ h$ t z
globals
! i9 z9 q% {3 A6 l+ z[, {& @9 E% I% D" |
grid-x-inc ;; the amount of patches in between two roads in the x direction( x e3 T+ r& f3 W0 V3 g( S
grid-y-inc ;; the amount of patches in between two roads in the y direction! W- R1 i- Q1 c g5 d
acceleration ;; the constant that controls how much a car speeds up or slows down by if7 Q3 C( d( f% w- K" ~* [7 D
;; it is to accelerate or decelerate$ i! _# G ]+ ^7 t& k# p& l4 U, U
phase ;; keeps track of the phase
: F4 b6 }& O p) x2 T: g num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
. D4 F+ g+ m) {6 G1 X$ O current-light ;; the currently selected light
0 B' d8 q$ S4 A) A t6 ]; ~6 D# _: K0 N% d( t6 e# C3 j
;; patch agentsets; `! ?' d; M9 y5 X
intersections ;; agentset containing the patches that are intersections
' s/ j( J, Q) F4 f( o1 O( j* ]# J roads ;; agentset containing the patches that are roads
2 E! T* l: K9 H( O/ N]
5 ~% \. b3 ^1 H( x1 [, k% f6 v/ \2 k$ w2 m: s1 @
turtles-own
9 b* {( l: H, D, \ K* F[
/ {' n" j) U- B/ X0 J/ [$ {4 q2 b speed ;; the speed of the turtle
4 T* n7 [) n& f( h6 x4 Y3 E D up-car? ;; true if the turtle moves downwards and false if it moves to the right! W- v# b* s( U" S! L
wait-time ;; the amount of time since the last time a turtle has moved
' w, f( O; H m& K6 b/ J]9 g' {' r1 ]+ B) v# y2 r/ C
) Y0 m F p& k- gpatches-own
$ Y. j; q' |( Q/ d[7 i+ B0 ?1 w! P s9 e
intersection? ;; true if the patch is at the intersection of two roads
% Y" R* Y# z6 J3 | green-light-up? ;; true if the green light is above the intersection. otherwise, false.2 p3 C$ ~( I! U% Y
;; false for a non-intersection patches.$ [; C" u, p+ A$ ?& q: G4 d& ^
my-row ;; the row of the intersection counting from the upper left corner of the
2 B/ E. b3 f# a! E" B0 z# q* G6 N5 Y ;; world. -1 for non-intersection patches.
, O! g5 F9 o5 _; Z9 Z# o my-column ;; the column of the intersection counting from the upper left corner of the# x3 B* Z2 ~8 n, M9 ?# `. Y
;; world. -1 for non-intersection patches." J+ ]1 U0 D/ D% v8 j/ G- q) u
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
$ V: M: M% p! n) F auto? ;; whether or not this intersection will switch automatically.
' D; d2 S' h; l+ @$ B& n( R! a ;; false for non-intersection patches.# n1 {4 ^/ W& F4 u' u- Y# T x& R8 I
]
/ {$ A& y( Y8 p# e3 Y8 ?
; a& ~. `* i% b/ e
; J/ ^ q2 ?9 ?. u* E4 K7 g- _. y+ ];;;;;;;;;;;;;;;;;;;;;;
0 v8 Z. i- y, q9 o: F6 q;; Setup Procedures ;;: L# h& `7 y Y
;;;;;;;;;;;;;;;;;;;;;;
, p- U# Y, }6 e% C( M# \4 W+ e( \+ ]/ f4 K& K" @' X
;; Initialize the display by giving the global and patch variables initial values.% Z1 V- W* a! y! A: Q
;; Create num-cars of turtles if there are enough road patches for one turtle to
2 J9 h$ R3 F0 l0 V& j4 _) d9 D;; be created per road patch. Set up the plots.
$ d; Z. f, O* V7 o" N6 B3 d( Oto setup
- \/ V/ e7 o9 `/ [$ g ca
/ a) t7 V5 S+ B# o7 v. ` setup-globals
5 g x1 ~- S3 C5 d/ @( b5 Y
. b3 Z& [2 U! I3 _! W6 s' e7 [ ;; First we ask the patches to draw themselves and set up a few variables
/ h2 E6 M! D6 ?! v v, |' F setup-patches
. t7 Q8 @: J" ~* K1 Q$ _ make-current one-of intersections
! T; Q9 r' `, w label-current
8 e/ P' ^ v# D# U. F- y7 V, a0 s
set-default-shape turtles "car"
* O* A/ O7 [& }, k
; u9 I- a/ x& K# v% |" b: D if (num-cars > count roads)
' Q" X: k. n4 }- A [. Q$ b! K* H! l) v: F6 ` o- F
user-message (word "There are too many cars for the amount of "
* `* X, U+ i/ D" `( a1 I$ S "road. Either increase the amount of roads "
# G( v. B# z' g "by increasing the GRID-SIZE-X or "' E( A" I/ s4 p5 s0 ^0 H5 j
"GRID-SIZE-Y sliders, or decrease the "
q/ Q+ s# R% {; \% W "number of cars by lowering the NUMBER slider.\n": H% y( H/ m1 |4 L
"The setup has stopped.")
. P* k5 R5 L1 l: X h0 ~' X6 [ stop; q& T) L. x) A9 U5 J
]
' o+ y+ ~; h7 o L0 J9 ?9 i5 g
' Y3 n% c- K [ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
, D3 i+ K; y3 H$ ] crt num-cars
1 D9 W' {1 g: q) c- `5 @ [) p/ C- c: @: l5 r
setup-cars
- a& s% b3 m; B0 C set-car-color) @. t( w* N: B7 w0 f0 l
record-data
+ ?* Q b6 B/ r2 D! ^) X ]
, I. s; Z# V% I; `0 H, _
+ K; V& I$ d4 F7 R7 p ;; give the turtles an initial speed5 Q* K5 h' ^% ^7 S6 \2 k" B' ?" B
ask turtles [ set-car-speed ]' @. H Z2 m4 I A8 d0 C
# c- S1 S5 f- F% n$ }
reset-ticks
) Z, ~2 ~+ C' k) ?end
' H/ r! \* y4 `# U& C; N' W( `' L2 C* \; T+ Z$ [5 [* u6 f
;; Initialize the global variables to appropriate values/ U- f4 F0 S* u6 e1 K. @0 r: a
to setup-globals X) ?6 f4 N. n; j- ^
set current-light nobody ;; just for now, since there are no lights yet
! E* n) U p7 T* K" t. z9 a7 Y set phase 0
! _ E% P; U* \; D0 X5 T set num-cars-stopped 0
( K/ u4 t6 S/ G: R _* F set grid-x-inc world-width / grid-size-x( x* w" r" o" q# b
set grid-y-inc world-height / grid-size-y
N1 b6 }1 z v* j
3 d ]* D+ V" S- q ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary0 v9 X7 E6 }+ v( d" T
set acceleration 0.099
8 |+ S' J1 y8 y B& D5 w, wend- p k! g: ~$ D) H
& J; {0 m1 H: a3 P+ ~" ^' `3 t6 d% j* U A
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
! t- w3 N: K/ k" `- ];; and initialize the traffic lights to one setting% } U. f* O7 s- P
to setup-patches
. t- g: c$ U2 J7 v, r& d( Q/ v ;; initialize the patch-owned variables and color the patches to a base-color
c4 ^% f% R& ^# p! t4 b ask patches m& o1 O& P2 J% D
[0 n8 G; w0 ^: Z, a' q' M; o' |
set intersection? false
. ?8 O+ S' a% Z6 j Q set auto? false2 ?* R9 n# t# ?) H1 t; ?# u" H
set green-light-up? true2 W$ d! c+ a# i1 p" p. O3 `
set my-row -15 Y* i+ F+ B4 s1 a
set my-column -1$ I' G Q- }, G' A4 o0 Y6 [& v
set my-phase -15 A) ^. h9 o+ t$ m
set pcolor brown + 3
' r! _# g# S( d4 P' @$ ^ ]/ ]2 b, l v7 q8 P0 y8 _; M- T
" p& S% f& R0 P* Y6 {$ b0 o! l
;; initialize the global variables that hold patch agentsets. y( j+ ?4 A% ?$ e1 L
set roads patches with' l. B3 g* N' w1 Z5 X
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% f+ z+ G- Q7 i' i: p R) d (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: T0 _* J1 U( [+ m& l: _
set intersections roads with
( L1 J+ r- F0 w: }0 N! L% x [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and! C" L/ R: Z: W
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ |5 D; t0 r+ d' ~! ~, X# k* Y$ C" J% Q4 l
ask roads [ set pcolor white ]8 J% N0 m `2 b: u9 |' a' T
setup-intersections/ {, }* x0 P5 \9 R7 X/ }
end
* @0 e5 x% y ?; D/ S9 c其中定义道路的句子,如下所示,是什么意思啊?
2 m- g; Q9 A, ^ set roads patches with
; K( ^' h5 }0 N2 _% O' H6 S [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: e+ K7 a- ?0 A9 [. ~8 L" U) R8 J (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# p* |3 K. i( [+ d+ |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? |
|