|
|
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。# W& G8 N. G" o
netlogo自带的social science--traffic grid这一例子当中,8 i, l2 F- X) Q& y& B3 r; q
globals# ^/ D, n: ]$ k6 j) Y& ]# Z
[$ a- r7 X& f" I. O
grid-x-inc ;; the amount of patches in between two roads in the x direction9 W, z* N3 Z* x/ ?5 w2 k; x
grid-y-inc ;; the amount of patches in between two roads in the y direction
8 Y; k$ `% Y4 F9 ?2 _ acceleration ;; the constant that controls how much a car speeds up or slows down by if, |3 L8 C$ k2 b) a; y7 U5 j
;; it is to accelerate or decelerate
+ k3 l N9 }; t( z& d phase ;; keeps track of the phase# z; x6 J) K, V$ b _
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure# @& \5 B" N+ @2 f+ f4 C$ {6 s
current-light ;; the currently selected light
1 {0 u( t. y% _4 M
6 s' `3 [& l1 n, y% u ;; patch agentsets
, J9 u/ }+ ^3 C' r6 ^- [ intersections ;; agentset containing the patches that are intersections
/ [% U9 O0 g% v: o/ q6 r+ B! C roads ;; agentset containing the patches that are roads
# a" W. r) q9 k+ B' i. @) D. ?]
$ l: w/ p/ K) G2 J4 E2 X: T# _; @( W9 T# n6 v* @5 q, X
turtles-own: c) Q5 o/ E k2 z
[
: E5 k9 X6 V' g( b h7 B; C speed ;; the speed of the turtle! z1 h# w! x0 c; }$ \: d- ?
up-car? ;; true if the turtle moves downwards and false if it moves to the right9 Z5 v* S) l @8 m+ v
wait-time ;; the amount of time since the last time a turtle has moved- E8 \& S! U2 }" }2 k# g; f, J2 s
]2 Q8 g. l) ^; R. {
- W( `/ e6 x1 g5 \
patches-own, q3 \( P3 P6 l# W' H1 a# k
[& C2 }) R% T% l% w9 ?
intersection? ;; true if the patch is at the intersection of two roads
: D* R' X/ ^/ I! w+ n' T green-light-up? ;; true if the green light is above the intersection. otherwise, false.
! w" o2 S/ P. b ;; false for a non-intersection patches.$ W' F! Y/ n- @. |
my-row ;; the row of the intersection counting from the upper left corner of the1 u' L. G2 A1 ]4 J) B. a
;; world. -1 for non-intersection patches.* J! |$ G! H! c/ ?) _
my-column ;; the column of the intersection counting from the upper left corner of the
+ ~% B1 R: P0 j/ P" F. _, q/ B9 v ;; world. -1 for non-intersection patches.
' z5 i% y/ M6 C% ^8 ] my-phase ;; the phase for the intersection. -1 for non-intersection patches.
2 a. l; ] v6 C* h/ @& ? auto? ;; whether or not this intersection will switch automatically.
8 c8 a: s: c# [5 a0 O ;; false for non-intersection patches.4 {- Y5 l4 e$ U0 {3 `9 ^
]
* T- U" g! n2 k, x! c# g
9 u- e# M7 b% e6 i0 b
( d, X# ~" r% ]0 f9 S;;;;;;;;;;;;;;;;;;;;;;
$ k. Y$ n) g. e# o;; Setup Procedures ;;
( x; ]" `2 I4 l2 M( T" F;;;;;;;;;;;;;;;;;;;;;;
, _+ O1 J# M! n1 K5 |) Z$ n- S5 N2 ]: A
;; Initialize the display by giving the global and patch variables initial values.
0 q. I* i% r/ C& m! c. L: f;; Create num-cars of turtles if there are enough road patches for one turtle to
) b2 z- {3 {. Y7 d2 n! R" Q0 R;; be created per road patch. Set up the plots.
- ^ N( d1 P; Hto setup1 }. u) H1 G: m$ x9 o9 T1 I
ca
9 v" @) C% [. [6 R setup-globals
7 m2 z D; A( J8 r u: m- I3 d9 y7 _$ K9 C% I ?0 o$ T9 s
;; First we ask the patches to draw themselves and set up a few variables2 Y, d x! y) D
setup-patches
1 K. O( |; C& {& M make-current one-of intersections. D" o) X* i, E! s! x Y+ `1 ^
label-current
% Y1 R( o! |4 v! C; ~( w$ g6 s T$ _2 F! Q1 A6 o
set-default-shape turtles "car"
7 @( S z' C5 M/ @2 V; G& e
& x+ p: s! [1 a1 n! ?2 Z& \/ [ if (num-cars > count roads)# G8 ^) M, V, v6 O1 X
[
1 B4 J+ p( } o% W2 y1 U, Q8 i5 Y user-message (word "There are too many cars for the amount of "
V+ k6 o5 d& ` Z, K "road. Either increase the amount of roads "
0 y' o$ t* ~2 w: E8 f" p( B "by increasing the GRID-SIZE-X or "
8 ^ `$ f3 Z9 r" w9 d% c "GRID-SIZE-Y sliders, or decrease the "
6 ]- W6 g) H$ P5 Y "number of cars by lowering the NUMBER slider.\n"
Z% [4 M* e& K4 D, ^% P "The setup has stopped.")+ U' a% f6 O \4 H3 S
stop' x* o1 s7 _8 f: i- V5 _
]
2 ~/ x9 [$ c" Z# U" M3 i# o; R
- l3 r' W, s5 b& s. o/ X8 t0 j4 R ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color& M3 e1 h/ U4 u# ]: s4 `3 P
crt num-cars0 P5 m3 e+ P9 E$ u; d5 [3 H& w. g
[2 E S: u+ D7 }! M3 \
setup-cars
7 l3 G9 {7 J+ A) k0 _0 g5 i3 \ set-car-color
4 R3 W- H8 { P0 x4 r7 @# e: U record-data
% U0 C# j; w0 ~7 U ]2 \5 U/ V! a+ L" H- }
: V, O, C% C; _( R; M
;; give the turtles an initial speed( T t+ j D. K& ]. W
ask turtles [ set-car-speed ]
) d$ m( o: e a5 e! r6 t1 B( x2 ^6 D9 {9 p: ~' ^
reset-ticks
' y" a' E# _/ H0 `3 b( zend' H, t2 e1 ]$ f1 F- B
' w, t4 V! l* q- h% e1 \;; Initialize the global variables to appropriate values3 H- V) l' N% N
to setup-globals, E8 `/ ?. a- D$ W0 |
set current-light nobody ;; just for now, since there are no lights yet" F! O3 J9 g2 K! K+ ]
set phase 0
/ t) Q+ P0 o+ L7 P set num-cars-stopped 0
; g f. ?" {8 I' c+ R E set grid-x-inc world-width / grid-size-x% M. k9 D' f5 o5 ?1 E: j
set grid-y-inc world-height / grid-size-y
6 U" i( L _. {, B7 J% H; D0 ~) |+ w4 H
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary0 @0 ]3 Z1 k- j1 x
set acceleration 0.099
# k' G2 N) v- s7 Mend0 |& l- K7 H$ V' Z# W* u
& a+ _: r5 Q% ^0 W# z
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
1 z2 J) c( ^ q( E/ e" c$ g5 y ~- _;; and initialize the traffic lights to one setting
6 I% n3 G; y3 y6 Yto setup-patches" F! k9 ?6 a5 ^+ F0 o2 `/ t* \
;; initialize the patch-owned variables and color the patches to a base-color
' [; ?% ]6 L/ ~! @' H ask patches; b3 N$ s& l. K# V7 w: @. z" i
[2 u0 v9 G" I4 v- A% Y# Y) i
set intersection? false
6 C' K, Z% Z" z) @: s5 `+ m4 x set auto? false2 t: T. e5 O; g$ d$ M
set green-light-up? true
& y, t! H( u \7 S6 f% }& g set my-row -1: N! B {) c" R' S9 L$ ?( g
set my-column -1
' ]" a" b ]: ~8 n I* j: I set my-phase -1
* `4 n6 l* Q9 S( d' t4 ?- @ set pcolor brown + 36 C5 r) h! F% T: I
]
4 ?' u! s2 S; x$ {+ |! F$ Q! f, E5 u) l, C# c# x: p
;; initialize the global variables that hold patch agentsets
, x, l% A% y M1 T6 Y7 ? set roads patches with
3 v7 \. ~7 B) B1 p [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 N. o& @4 K7 D# s (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 M9 _5 l. y, _8 F' I
set intersections roads with% F& O$ r0 t _$ \# ~, X) S6 ]
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' k& a6 S T4 ?( u2 N" D3 R. I. j (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& {; |: D2 c+ X8 Z' M" C8 R& C
* G+ e+ I) }' l& {5 n2 H8 O
ask roads [ set pcolor white ]/ o' W& } l- `% B) D
setup-intersections5 {* M* r5 w% C
end
0 ~% h4 t# o* D其中定义道路的句子,如下所示,是什么意思啊?2 Y1 b3 A# [. e) E
set roads patches with7 _! u1 _- X; G) z5 [; y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% h' H+ I) y' \8 c) `% Q2 n* W* U3 ]
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 H0 ?1 Y. y1 M. v& o1 \* X E6 ]
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? |
|