|
|
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。
9 a8 y' p; C. a7 `! ~' m7 D6 [netlogo自带的social science--traffic grid这一例子当中,
6 m A2 C9 m7 L! r) `% w# Xglobals: D( O( c. e$ f8 P
[
$ o! w! j A- l" G2 F grid-x-inc ;; the amount of patches in between two roads in the x direction: w2 B6 `# Z$ J+ z/ A$ o% B+ E/ s* X
grid-y-inc ;; the amount of patches in between two roads in the y direction
* a, B8 [3 x6 `% _ acceleration ;; the constant that controls how much a car speeds up or slows down by if4 p4 P: l) a# R7 o# ^
;; it is to accelerate or decelerate
" X/ z/ @* t5 h' p phase ;; keeps track of the phase
. P1 T1 i& K4 E& P9 G num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure" \0 M; `0 I/ A; R& M
current-light ;; the currently selected light
% T$ O3 ~ K3 D6 q) m) d$ ]' _/ x/ _% G# r' F: _& g% C
;; patch agentsets
% m& E1 R8 j& Y intersections ;; agentset containing the patches that are intersections
5 u3 d7 S4 y- i# X9 _: K roads ;; agentset containing the patches that are roads
/ f9 {, q" q" K0 ^9 f]
8 l; n( k8 q: F! F6 T" G7 D4 p3 q1 W0 L9 r
turtles-own
7 d$ ^8 x: U) e4 b e8 f& E[/ ?. H& \( e2 ^* L
speed ;; the speed of the turtle% L. c b# X+ m
up-car? ;; true if the turtle moves downwards and false if it moves to the right
# ]6 c: y: T4 n& a. m7 u" q wait-time ;; the amount of time since the last time a turtle has moved3 D4 N+ V+ \- _7 F
]% y T& e7 O; N9 f
) f. i( K& Q3 W4 {/ f, d; I% {
patches-own
& w1 M2 k: ]2 l) s, R: `8 t9 r[1 o, P+ K8 `% c: |9 w/ X. ?" T3 N
intersection? ;; true if the patch is at the intersection of two roads
$ C6 \$ O# a; R. L green-light-up? ;; true if the green light is above the intersection. otherwise, false.4 b) |8 N; l3 z3 t) K* r1 U6 N
;; false for a non-intersection patches.
5 o- x( q: ^8 j my-row ;; the row of the intersection counting from the upper left corner of the! ]) v: s; T9 {* G, t3 x" y8 E3 A
;; world. -1 for non-intersection patches.
+ s- E7 V6 T6 z& s" i5 s my-column ;; the column of the intersection counting from the upper left corner of the
2 z2 Q0 X4 x# S6 s/ Z ;; world. -1 for non-intersection patches.+ k+ x; o o& b$ o; d) A
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
+ O2 B4 }" p; x; m5 p9 _6 m auto? ;; whether or not this intersection will switch automatically.
' W! E' g: V9 E% X. H' `" m7 C ;; false for non-intersection patches.0 E& |& `# @; l
]
. p" ~! y+ `) C/ C7 ~. J1 U" P6 i" E6 Y/ p9 E3 W; M1 V
- v% W& x5 R b. b$ f;;;;;;;;;;;;;;;;;;;;;;
* N- d3 b+ r+ _% v% c6 Y `;; Setup Procedures ;;
9 e1 v4 w& W( [% d% F$ ~( ~;;;;;;;;;;;;;;;;;;;;;;- _9 W7 R- J4 d
) M- o3 p, L9 b3 {9 v/ }) o
;; Initialize the display by giving the global and patch variables initial values.
/ s3 h0 B3 f: q+ Z# R;; Create num-cars of turtles if there are enough road patches for one turtle to
% f E/ a) F8 W4 Y% h+ P;; be created per road patch. Set up the plots.
& k: F6 h( K7 oto setup5 w4 c: T0 x6 J2 Z- b
ca
* { u$ q' B/ g7 u1 q) n3 t setup-globals; U6 P: l9 R) `/ L: c( s# Q* W
* C" [; F: E X! V# m! D7 \
;; First we ask the patches to draw themselves and set up a few variables; ]) t5 E, }$ }0 P
setup-patches
) \6 X: c" C. \. n make-current one-of intersections# D+ ^3 j2 W9 V5 T5 f* z( k
label-current
9 \& t6 I; q! V/ q% C' E9 c
" F& c% J0 I5 V3 K8 b. U u+ V6 q( n set-default-shape turtles "car") h( b! {$ w, L
* J# i m2 Y0 c- p2 r% o% q' Y if (num-cars > count roads)5 e$ c$ w; i0 p! {
[+ M' B6 k2 a- X6 R& [
user-message (word "There are too many cars for the amount of "
k3 R$ r. ?! _* ?! \4 ` "road. Either increase the amount of roads "
# u$ O6 e' f2 y "by increasing the GRID-SIZE-X or "+ U. R5 s. l8 N% u* `; m9 k
"GRID-SIZE-Y sliders, or decrease the "
& |$ D9 F2 \2 L* V% X; u "number of cars by lowering the NUMBER slider.\n"+ y t1 i/ x- o% d
"The setup has stopped.")
7 x% V' O$ H4 c! d6 r$ p3 I stop
. B$ u% t, b& T! j% H( ~1 u) w ]
6 B. w; d# P7 c1 `3 k* O) ]
1 ]8 x( r: h" J ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
2 T5 f' K2 t k7 O" O crt num-cars3 L7 m) |. l" E3 ^
[- ?- U- V* X9 A ^* u8 Y+ R* Z$ v
setup-cars. B, W" k- G" b1 V3 U% m
set-car-color
& q5 `% s4 O3 [: s" J8 Y record-data* m& b f. h% O8 [+ t
]
, X' @# D9 j& i1 @& ?" t) }: _# E% i5 k
6 I, A3 C! h+ _7 n% a ;; give the turtles an initial speed( `) u T( g7 v- d) A0 {
ask turtles [ set-car-speed ]
! \" q0 A' h1 n1 A+ m$ p6 A: ~$ _
8 g5 _% f, n+ S. i reset-ticks' N0 G3 H/ S, w o9 ~1 G- m; E1 A; ^
end
* I$ T* T4 {! \
w/ F8 Y! B, C- X9 ~( M;; Initialize the global variables to appropriate values5 `9 U# P' H: q
to setup-globals
& b/ j0 q- k: v: m set current-light nobody ;; just for now, since there are no lights yet
" l" p- q( u6 K2 W; ^. J set phase 0
u) q0 O# J4 O: l/ R/ f9 Z set num-cars-stopped 0
3 }# H, k7 u" b set grid-x-inc world-width / grid-size-x6 T7 ^8 j* A9 G4 w0 x; I( R& O
set grid-y-inc world-height / grid-size-y
3 u0 k9 L4 B- V% N( M4 |+ {7 c* ^# X0 m9 R" i( n! F
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary g& W7 t8 ?. ]: C) Z& K3 M
set acceleration 0.099
1 [& Z" w8 w- `. d' |end
+ h( h2 p+ U1 Q# D5 v3 a4 ~9 ^3 C/ \3 o1 r& a
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,1 F" k9 O% @0 a
;; and initialize the traffic lights to one setting
8 i+ p0 D! j2 o# h b" ?to setup-patches
5 A: |7 F. H8 f" v( X3 q# A ;; initialize the patch-owned variables and color the patches to a base-color7 u9 D2 I) j6 j* O: b
ask patches# ]2 t% m/ \% J: }6 p) A" N' Q
[9 @* r3 |7 F J1 \; z9 E3 }
set intersection? false
- \. M3 Z! i6 ]+ |/ [+ a set auto? false+ y9 q. g9 A* k: z. R/ {
set green-light-up? true
* i4 `. ?! K7 m9 N, p. b set my-row -1
7 D# u* x. q4 a set my-column -1: w, k+ j3 A) j6 S
set my-phase -1% s8 X6 G% w- n9 F$ P
set pcolor brown + 3
. n, m) y6 ]& a" p ]
( c) N* ?7 D6 N# v! L9 F
5 w- ]* A7 V! `* k- C9 u( f ;; initialize the global variables that hold patch agentsets% z- b0 w6 Z% W- Z) O- L
set roads patches with
8 u$ o( n, s( Y; ]. { [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 p) V# s& y6 E& m+ m (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ f+ d l# W. t$ T" J6 l: F set intersections roads with
3 ?4 x$ `! Q4 R/ @* o, {% A! i [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and3 C/ x3 u: I4 _& u! l/ A. ]5 t
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
( Y3 n6 k6 R. {) Z3 M
0 J& s7 V, ]! b! M9 M, f8 A% S3 v ask roads [ set pcolor white ]- l+ q5 W3 n; M
setup-intersections
( i$ e4 x$ W1 K" [/ v( Send
+ J' J% \3 j# K! C! S( W; I& h其中定义道路的句子,如下所示,是什么意思啊?- G: n8 S; O' B& ^+ Z
set roads patches with
9 P9 {& A6 |. s. N0 E* n' H [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
( L. T) s) J+ L T0 E4 t (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 D% w; D- I- P: E1 B* T, T
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? |
|