|
|
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。
( O" p' I! k8 nnetlogo自带的social science--traffic grid这一例子当中,, o+ e$ t" q" t! ^2 m! Q
globals
& x7 H, G) k0 K( W5 s$ L[
: U% `# c0 O% G n v grid-x-inc ;; the amount of patches in between two roads in the x direction
( k9 Y) S7 `& B* W# X grid-y-inc ;; the amount of patches in between two roads in the y direction
+ X r" M+ f+ F6 x acceleration ;; the constant that controls how much a car speeds up or slows down by if
. I7 Q4 L& O- [0 O( [, @+ I ;; it is to accelerate or decelerate
+ m0 e8 b( e: w% C7 p; ] X phase ;; keeps track of the phase! A; T/ `8 @8 C2 L; V) t! O
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure3 q- { P; Z; s' h1 N: C1 j
current-light ;; the currently selected light) E \/ h: b/ X2 A: J$ |4 Q
. Q3 A- l, L3 \1 U8 G% W+ @ I ;; patch agentsets
; R% p ~( S$ E( \$ e G intersections ;; agentset containing the patches that are intersections
, k& d! g5 h( o. I" Y4 S3 i Z roads ;; agentset containing the patches that are roads
+ E& z& F. U: K+ _]
/ ]0 m% g6 o9 j4 j: I M/ Z7 ^
' _8 [& I7 ]6 g: B y) ]( E, a }turtles-own" e) u, V; [4 d, _- ~( q6 w6 @
[
, L6 i: }- T9 v- W: P& o; K1 W speed ;; the speed of the turtle
9 o. ^' o0 e9 q P up-car? ;; true if the turtle moves downwards and false if it moves to the right8 w/ g2 [: O' |+ o5 d* @ S
wait-time ;; the amount of time since the last time a turtle has moved p4 N( A3 n* L$ n1 h& t; r0 E
]
/ @, E% k/ m6 B4 n5 ^ v4 P3 l& t/ Q3 b: {0 W
patches-own
2 ^% }% G c" c5 P0 e" K! r[
1 H$ L8 @4 U" `6 X W6 ~1 ^ intersection? ;; true if the patch is at the intersection of two roads
* D% r* [. @2 p$ ?% Y+ | green-light-up? ;; true if the green light is above the intersection. otherwise, false.$ Z( u+ i4 h; \) w0 ~8 N4 R
;; false for a non-intersection patches.
3 _; i$ w! `4 z! C5 { my-row ;; the row of the intersection counting from the upper left corner of the
8 u, D+ e b( z d+ P, H ;; world. -1 for non-intersection patches.% [+ J9 \6 I P7 F5 S6 X: D
my-column ;; the column of the intersection counting from the upper left corner of the
3 _: z0 z5 \, S, j ;; world. -1 for non-intersection patches.4 c7 o* g) z. ^
my-phase ;; the phase for the intersection. -1 for non-intersection patches.% C1 p- R& l8 `- ?; B$ j! V3 Q
auto? ;; whether or not this intersection will switch automatically.
0 Z0 r! g$ @' s9 ]. \/ Z: n5 k ;; false for non-intersection patches.
% w( h0 j! w. O]
4 Z( G3 G$ O$ v/ K' n3 E- E1 f5 t8 `4 @6 h9 X
9 W# ^( ?" L$ e# X; z! t
;;;;;;;;;;;;;;;;;;;;;;
0 v3 k4 f) X( b$ b/ Q6 j4 M;; Setup Procedures ;;
`+ r7 ^4 P/ h7 A3 };;;;;;;;;;;;;;;;;;;;;;
/ d$ n8 M% ]! Z- J8 O/ o1 d% ^# L6 ~+ H
;; Initialize the display by giving the global and patch variables initial values.% q: M T" L, j0 V2 K: x6 |
;; Create num-cars of turtles if there are enough road patches for one turtle to
/ K9 m! j* B2 H4 j5 v$ D: @;; be created per road patch. Set up the plots.
- }- J9 q. j @% O# O4 W# Tto setup' b o( q0 M" e- O- j9 u" H' v5 @
ca1 Q2 q( S. l7 r; u
setup-globals
! X( \& X u$ K5 @4 z
) x1 Y1 ~' j: p _0 {% B ;; First we ask the patches to draw themselves and set up a few variables
, P1 o- r1 D/ V% R! H% A9 } setup-patches; R% Y1 _3 J& y$ n3 [+ n
make-current one-of intersections
6 C' H* V4 H4 ^8 {% J8 [! k! x label-current
5 S" ~& [2 Y( Q0 H8 M' a4 K1 k* O' }4 N9 E$ A* d R
set-default-shape turtles "car"! z8 B: \' E) R N
/ w. C4 ~! T7 k5 S5 w& } if (num-cars > count roads)
3 H% u5 W+ q! x# K [
0 j0 i) p% s( y. x& v) z user-message (word "There are too many cars for the amount of "
8 Y. [: t' L6 [( `1 E9 z! Z K& [ "road. Either increase the amount of roads "
0 M: x" Q! V2 I4 d% h4 o2 I- C "by increasing the GRID-SIZE-X or ", K+ }# ]( {$ o) P* M' r
"GRID-SIZE-Y sliders, or decrease the "
7 Q# G" @* O+ H0 m+ s "number of cars by lowering the NUMBER slider.\n"
0 o2 m; J9 Q0 D "The setup has stopped.")- a5 O0 X3 W' V1 z$ `3 E. r
stop
" n! q3 w; y3 l' d7 G: y+ j ]
. n, f3 E! R! Y$ T: m
- X7 e5 m- U1 Z) `3 A ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color; m+ |3 d0 o- Q% p7 B; C6 ?
crt num-cars% w1 ~9 S* J. @) x) R3 [8 f
[
- ~6 e+ O* h/ E' s setup-cars
4 A/ E8 Y" h& \, [! Q' A set-car-color) i( `: s) Q0 U* p$ K; ?. l0 L Y- D
record-data( p' @; L. i& r8 v; L7 _1 c4 w( _
]
# O) D1 z$ C9 A- J1 S
! Y/ T! w. l* ^; u( y+ X ;; give the turtles an initial speed* n& S7 @7 T; ]- ?! H5 B
ask turtles [ set-car-speed ]: `& W% @0 |6 V
6 O0 E. v& _* g9 s1 ?+ S" c7 ^! N
reset-ticks
- ]+ k4 f; S. d( o, n" q4 qend
3 O2 V0 K$ h+ T) O z4 |
7 r% s: k4 ^& d+ c) k6 H; Q' s; t) j;; Initialize the global variables to appropriate values
# Y2 b1 s# |9 p; [ ]to setup-globals- Y9 g& ]" B$ D1 B* u
set current-light nobody ;; just for now, since there are no lights yet
& F' o2 K% q7 h3 P! r' E set phase 0
' Y5 l# W/ W4 B/ @9 R set num-cars-stopped 0& C1 _- Y4 {6 K0 g6 F
set grid-x-inc world-width / grid-size-x
- g7 ~. m# h2 `' k5 T set grid-y-inc world-height / grid-size-y( ?5 Y Z4 F! P' I; w
9 Y( F2 E& m8 D' y! ^$ ^9 n0 s ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
/ J4 n% w) m$ \/ W+ t* B( |1 Y$ ^ set acceleration 0.099
/ H9 p0 R6 x7 k; k1 j% \& f7 C. Cend
9 S6 t. m$ \2 |/ H; M+ R) Y+ j
' V9 E% l( ?: [: o;; Make the patches have appropriate colors, set up the roads and intersections agentsets,# j9 A) [" k0 E" x
;; and initialize the traffic lights to one setting
3 M8 l1 q" u. }# Jto setup-patches0 `) Q5 d4 Q0 Y, H* F# p% W
;; initialize the patch-owned variables and color the patches to a base-color( E* M5 S3 \( p9 E6 l( w
ask patches
6 D# U6 {$ z3 b8 G1 Y5 ?5 r [
: F1 B1 n5 C( t8 T& d& |2 W set intersection? false
( {0 V3 i& U- e9 W) E2 q, N set auto? false' G5 @, j a% g0 p) _
set green-light-up? true
$ n1 \& j, C4 b' h set my-row -11 ?# t2 F! A) u' t3 |' \- j
set my-column -1
0 h0 n6 y3 m4 S' I( Y set my-phase -1
4 i$ C% I4 K* O( j0 j. R4 q i set pcolor brown + 38 [/ l, a( H! a% r% x. R, E# \
]
: O, N& j& j) I N1 s# Q
4 @/ w0 q# Q1 U2 |. V4 A" V/ W ;; initialize the global variables that hold patch agentsets7 l& v' q2 X3 p; I
set roads patches with9 X3 |: y& R2 d8 o. u5 t( J3 w- I% @
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 t1 i4 f: c% D5 ^1 t
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]& M1 t6 B3 _% W' B" p! {0 h( M$ s
set intersections roads with
- f9 M8 j1 `3 E1 G% t1 G, x [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
* ? V5 B: [ H, d' P0 V0 y. [ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! I5 q1 Y' }; h2 }* _# {" c5 u+ x z
4 Q( v4 T3 m9 ]! \ x& s: M ask roads [ set pcolor white ]
; ` F6 u3 k! |# c3 i; J setup-intersections
3 ]& ~, K1 S _8 V2 _end& q& w& T7 ]2 q6 s+ d
其中定义道路的句子,如下所示,是什么意思啊?
9 r5 B, k( E* d) n* S set roads patches with
( O4 U/ A) h+ r) Z! C [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; z7 [2 O6 F/ |$ I+ q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. u6 X; J8 e- L
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? |
|