|
|
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 t k& |* o, R& W/ N jnetlogo自带的social science--traffic grid这一例子当中,
8 N8 q9 A# Z* ~$ t: c8 S0 vglobals
% x3 O3 D) K2 u1 Q. C' v[
/ g! P5 q% E9 Q$ e5 f5 ~; F! r$ L grid-x-inc ;; the amount of patches in between two roads in the x direction& j& F" f0 \0 L
grid-y-inc ;; the amount of patches in between two roads in the y direction
$ J1 s1 w+ ^( v. b/ v% G3 ~ acceleration ;; the constant that controls how much a car speeds up or slows down by if
8 m' |! g7 U' U* @% D: j3 V; L2 a ;; it is to accelerate or decelerate
; ?1 K) `, l+ S& q/ X8 _8 J phase ;; keeps track of the phase+ C* ?' s) ?2 k
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
$ b& S" {! L( s4 T$ I d% f7 N current-light ;; the currently selected light3 y1 v) F2 r0 W1 B: Z G
! ~+ q. K1 x# a
;; patch agentsets* K* m# l7 i, H( Y+ h- ?
intersections ;; agentset containing the patches that are intersections4 k6 B) T6 w$ \0 I8 m6 J" h
roads ;; agentset containing the patches that are roads3 n# I8 H Q5 s% d
]
% P" n# U' Z' q. \. A: x, E& q; c p9 H8 w) E' [! ~4 p0 y
turtles-own
9 s* u& ^6 |8 @3 r' h[
, U6 U' G: ~9 j0 r2 m' O speed ;; the speed of the turtle( H8 V5 ?' ^1 a' T7 I5 c9 T
up-car? ;; true if the turtle moves downwards and false if it moves to the right
Z* k3 o% W, ~7 C7 C/ d. v wait-time ;; the amount of time since the last time a turtle has moved
3 |- O' p- [1 i0 J- T, q1 `+ x: A]) j% ]9 L+ v& f! R' n2 @* M
3 y' C# X; E' U T
patches-own
% U8 }+ H# B; N8 C0 A4 @[; d8 w( [. F) D% q- G: c S+ z
intersection? ;; true if the patch is at the intersection of two roads5 R' p9 c& O L& D
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
; g6 u5 E6 x( v# x ;; false for a non-intersection patches.
* G2 }# T$ n' F/ l/ H y6 r my-row ;; the row of the intersection counting from the upper left corner of the) T) f( G) D0 H! j) O
;; world. -1 for non-intersection patches.
/ f2 I# F$ @4 h my-column ;; the column of the intersection counting from the upper left corner of the
& ~3 f) y" U$ z1 k4 A0 u3 K; ^ ;; world. -1 for non-intersection patches.
5 ]! s2 b8 z! n* H: A my-phase ;; the phase for the intersection. -1 for non-intersection patches.4 ^) E" E# [# } }
auto? ;; whether or not this intersection will switch automatically.4 V* U% F* t# p( ?" v* p6 j8 f. H
;; false for non-intersection patches.
5 v& {4 s0 B: ]- t u]
! S1 U i+ M$ Y1 B, G5 h H% M
8 I) `' D* P/ _5 j) x9 j6 d( N, R- G/ f# B y
;;;;;;;;;;;;;;;;;;;;;;" @( c- p$ k+ R+ k \# R* ?3 t
;; Setup Procedures ;;5 M: x* u0 e+ F
;;;;;;;;;;;;;;;;;;;;;;
) x- D& X* _% ~7 h! Q- N1 c; h0 {; g8 k/ V
;; Initialize the display by giving the global and patch variables initial values.) S2 O3 M+ S W0 T
;; Create num-cars of turtles if there are enough road patches for one turtle to
6 _( l# f n. n& f;; be created per road patch. Set up the plots.- _" z, t, F" v1 Q3 H
to setup
- ~% {4 c* H' e- y* A ca0 R4 i' V$ s4 W/ G
setup-globals2 {$ Q, @; w) B& x. N! q0 N
: q7 @5 U( N% B. l4 S+ h& e/ i
;; First we ask the patches to draw themselves and set up a few variables! r; E: f# u' |) X
setup-patches
! y* ^9 q d: q1 y: |+ P make-current one-of intersections1 ` B, r; w; o& M4 y3 Z% ~) [) E0 k
label-current
. e& Q# P4 L7 E- X
9 A8 ?7 N4 L! \$ _) M set-default-shape turtles "car"5 ^' l8 l' r5 s6 p
/ g* G9 J) r' P. _' F- W6 {7 O
if (num-cars > count roads): h- h+ I5 ]6 t( u) s
[+ f' _( E* I4 ^0 P% ~6 G3 K
user-message (word "There are too many cars for the amount of "- O, ?' c/ m$ T2 d* N
"road. Either increase the amount of roads "
' K; U! e9 S& n7 E "by increasing the GRID-SIZE-X or "
7 v6 _: p) }/ ^9 ~$ e7 _ "GRID-SIZE-Y sliders, or decrease the "
; j- |6 T$ S8 N# ? "number of cars by lowering the NUMBER slider.\n"9 j( t# ?9 z6 }& g' j
"The setup has stopped.")( s( r- v8 N* O6 y( R( a' V
stop0 m3 e5 `" T, X5 b+ h+ H
]4 K+ I) V: { P$ B+ N7 Q7 X& |6 O1 C
+ g0 M$ b/ H# v) P
;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
% X/ z; U( p7 e* u0 \; T. K crt num-cars0 Y9 {$ P) h: O! d. S, \; N
[
. v5 U+ e6 @5 h& {* S: R setup-cars/ a8 i+ r( y- t
set-car-color2 S, A4 y+ i% u/ s( |
record-data
/ n5 l& Q: M4 a* L5 Y ]
9 B) Y3 }) }( I% I7 ~/ \: `
( X4 J2 ?% O1 o+ i ;; give the turtles an initial speed
- @8 Y1 @) A5 c1 S) [+ ^ ask turtles [ set-car-speed ]
$ m c1 y" E! I$ ]! F1 W, J( X) M2 k: a7 [
reset-ticks
* V5 Z- M# j0 dend
2 u4 q+ V5 U7 H: O( W! e- |5 ~: C& n4 y
;; Initialize the global variables to appropriate values* C8 X2 G: i8 d* `+ J5 h1 Q
to setup-globals/ N* j$ k. |+ L* K0 o) Q* O
set current-light nobody ;; just for now, since there are no lights yet
" W) x. r# x/ n/ Y: M set phase 0
' p1 f* _( X- [1 ~* v. k set num-cars-stopped 0
' A% I P- \0 y4 ~0 |4 b& D set grid-x-inc world-width / grid-size-x
" U3 D, A2 |4 p- ] set grid-y-inc world-height / grid-size-y
; D8 q& y) M, J- w! r9 J# R7 ?, z% r! \
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary4 E) |5 [, ~, V2 r3 S* Z* N; P
set acceleration 0.099
+ b& R, _7 V7 \) S; T# G& \end
% l4 @8 W8 v# }0 j8 K3 O9 j3 L& B9 a5 R: t1 ]1 ?/ E
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
' i" v6 I* N+ ^0 q7 C;; and initialize the traffic lights to one setting2 Z2 i" ?8 r2 V6 P5 p! Y3 O. \" W9 Y
to setup-patches- t; `6 Z n4 g/ w6 c. S& p4 `
;; initialize the patch-owned variables and color the patches to a base-color/ H- o) t9 N& Q2 U' ~3 P: V0 h4 z
ask patches4 V: n6 U5 e8 J: q/ {, _
[: F8 N8 I* V0 D+ U) G
set intersection? false
5 K h5 |; a# Y/ T- n set auto? false
- n; I7 ]! p/ N set green-light-up? true
% T$ G7 V9 Y2 p3 M set my-row -1- i( i. k6 a. t2 E! E3 k9 m& u
set my-column -1( p3 T" ]- x$ c+ ^ y5 w& }9 D
set my-phase -1, M8 _3 v- W0 ^
set pcolor brown + 3# J3 S3 d4 v0 N3 U( @0 K f
]& x9 `8 W8 M: X5 g& z: Q; Q
! ?; v4 j7 I$ M( J! e" _ ;; initialize the global variables that hold patch agentsets
/ f# x6 X' Z/ y9 `- \+ n. C set roads patches with1 N3 r) A g* O5 J; c* r; w. M
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 Y- f- ]5 F* u% m4 G E, ~% u
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& ~- D3 M3 z6 a0 s ]; m. F% x7 O set intersections roads with
K: y% R1 o0 I1 D' `* _, p [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and9 n' l( W& V( J y. p5 W0 d6 o% k
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]: p8 V) F% K# k! d
* ^' C' G+ z" U5 M. t5 `) M
ask roads [ set pcolor white ]
$ z% _' C6 P, x% e+ Y' G! l setup-intersections
8 N: |* `+ X: r! P: kend
) q' w! v/ }0 y其中定义道路的句子,如下所示,是什么意思啊?# n% ^9 s7 H# q/ g% Q9 F
set roads patches with) z* w G- ]" ] F2 X
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ e" [4 r9 W( [ p# T' l6 R
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]. x# z* \& F T. \" S9 s* b8 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? |
|