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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。
# j7 r9 [7 E# ~* znetlogo自带的social science--traffic grid这一例子当中,3 d! m5 V# W- I& h
globals
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( _7 E3 ?. u) B. x# r# s) J grid-x-inc ;; the amount of patches in between two roads in the x direction. i4 T! ^! t3 N0 |7 ~* N( g# b
grid-y-inc ;; the amount of patches in between two roads in the y direction
' C7 ?8 P9 J' t: N Z- q acceleration ;; the constant that controls how much a car speeds up or slows down by if
% N5 E! a$ l) ?- C# o4 U9 |0 A4 d" `( } ;; it is to accelerate or decelerate
' U9 u1 i: U% f phase ;; keeps track of the phase
4 M# Q; q* V/ Z+ r6 r9 y num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
/ c2 f3 ?9 q7 J: [6 x" R& G! e% Q; g& I current-light ;; the currently selected light) c9 n4 D2 Y( B2 f! ~* `8 a
5 q5 Z" _5 ~0 e& b) h! F ;; patch agentsets* Z; n4 S4 o! v1 |% h
intersections ;; agentset containing the patches that are intersections
! \5 U7 _* b, r# Y roads ;; agentset containing the patches that are roads. n3 p& i4 r; G2 c2 w" g4 d0 }
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turtles-own
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speed ;; the speed of the turtle" ?8 H4 c' p$ \+ t) T- s/ w
up-car? ;; true if the turtle moves downwards and false if it moves to the right! Z+ S; s; k [$ x9 _
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own ] f6 Q* H) D9 `* N0 K3 p/ s
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& I0 c' F1 _$ V, L$ o8 ~ intersection? ;; true if the patch is at the intersection of two roads
0 r6 q3 z' O+ a# f/ F8 C2 p" ~1 b green-light-up? ;; true if the green light is above the intersection. otherwise, false.
; R# L' U$ l! Z ;; false for a non-intersection patches.. x; z" M5 X3 ?. r4 M
my-row ;; the row of the intersection counting from the upper left corner of the8 Q' b5 C+ S9 Q/ l
;; world. -1 for non-intersection patches.- p0 b. l: F$ H, m( N) }4 o% b
my-column ;; the column of the intersection counting from the upper left corner of the
) F1 z' H7 Z0 i! ^; ] f y ;; world. -1 for non-intersection patches.
% O* D2 E5 m' P; k* n my-phase ;; the phase for the intersection. -1 for non-intersection patches.
4 _) _" [3 b; N) S s0 a auto? ;; whether or not this intersection will switch automatically.
- |3 P8 d) |$ m# }3 g( Q4 j6 X ;; false for non-intersection patches.; r( S. U. t3 B* s
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' r; e( V, a: ?9 u4 g;;;;;;;;;;;;;;;;;;;;;;! z4 Y% j" m$ m
;; Setup Procedures ;;" Q6 i2 S2 X$ ^1 g! ]
;;;;;;;;;;;;;;;;;;;;;;6 r. k1 K6 R4 [( q6 f9 H# m
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;; Initialize the display by giving the global and patch variables initial values.
2 {, L/ U6 q7 ~. Z. Q- `0 [) R" Z;; Create num-cars of turtles if there are enough road patches for one turtle to' q5 p% w+ y9 l$ u8 d" S4 {5 n
;; be created per road patch. Set up the plots.
% e& g0 z6 Y E& Xto setup
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setup-globals
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1 y6 D. ~& s1 J- c4 o ;; First we ask the patches to draw themselves and set up a few variables
* G+ Y0 w8 a# b7 j setup-patches
N# Q0 Q9 ^, x8 P' N8 ` make-current one-of intersections
0 \, {2 O6 K2 c( s label-current
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set-default-shape turtles "car"
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if (num-cars > count roads)) A: A6 B7 D7 x, K
[
7 W! i6 N7 P0 ^& t, q: d user-message (word "There are too many cars for the amount of "* x, F. ^- |4 T2 N) x; G
"road. Either increase the amount of roads "" Z$ V/ i- ~. b% _( p
"by increasing the GRID-SIZE-X or "! [; w- t" {* k V- D
"GRID-SIZE-Y sliders, or decrease the "" k9 N% o6 @, ~, K
"number of cars by lowering the NUMBER slider.\n"
) ]# r+ r% X% V1 G) Q0 \ "The setup has stopped.")4 _* t) r. w' y8 M# Y! E. Z
stop9 Z6 w* ]/ E- l' J8 i8 z$ p" ^) R
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' ?3 K( O4 S8 n* O ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color# Q9 y9 U% R5 Q2 y1 ^- K& u* w
crt num-cars& @" L7 @* d: _0 W9 C- b
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setup-cars
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record-data
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2 I% L$ [2 Q y! K3 x; ^4 N ;; give the turtles an initial speed+ ^0 Z' @5 L0 e
ask turtles [ set-car-speed ]
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reset-ticks2 ]* e! H& w) Q# p! N4 X( H( f
end0 @3 m; w6 f* V ]9 b& C( n
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;; Initialize the global variables to appropriate values' ~; `1 x) U* E _& n# h
to setup-globals
1 ~4 @& R& _2 s; @$ i: _ set current-light nobody ;; just for now, since there are no lights yet
/ b. _, i7 U+ P# G& N2 N3 v8 s' l set phase 0
! R! J v J9 r" Z% e& p set num-cars-stopped 0. N) w! l1 I+ P/ E$ M/ M6 m( ]# u* o2 Y
set grid-x-inc world-width / grid-size-x5 i' \$ Y6 c; ?+ v) x4 [9 R
set grid-y-inc world-height / grid-size-y
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. ?* K; T% P a4 X0 a- f ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary; r# O% {+ n+ u( W ^
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,. {0 ~ w4 }/ g6 l. v* f
;; and initialize the traffic lights to one setting& x7 w. N+ Y, ~& n" X5 e) A) \
to setup-patches C- Z9 h. o1 S. ^# w
;; initialize the patch-owned variables and color the patches to a base-color
. Q" \7 A6 J! e. F4 L" W$ I" O: ~ ask patches3 z8 }, R0 O$ |* r0 w
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9 {. | b ^1 P. E. I/ V2 T" K; q5 \ set intersection? false
9 r2 C: X5 p, {5 q set auto? false
1 L/ f0 y. M8 Y% o( d$ s9 J set green-light-up? true7 M: h( G; q+ n/ T
set my-row -1
! K7 z, p: b i: v4 p( K6 P ^; `3 c set my-column -1
# X D' i7 T. C9 y2 U* e9 f v4 Y set my-phase -1
, v4 `+ d9 G& [$ m# p" c) q ?5 L set pcolor brown + 38 l4 I- G- `5 g p
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* B" {1 W+ B/ J y* z ;; initialize the global variables that hold patch agentsets" X! K( U2 C0 b( d! O% }
set roads patches with( o, ?, k& K' D% _$ ~
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 _1 q# p Q* l0 z7 d7 N1 v* f (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% L2 a5 P/ a$ e Y6 M set intersections roads with' d7 S, t, q) s: Z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ Y* A0 Q& {+ v) x
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 g* n. p# M, ~3 t L# X! K# r% _
2 Q5 ?% c4 F1 p, o* Q- `7 H/ r6 x ask roads [ set pcolor white ]* O- u" O* e1 M; m- y! H/ y* u0 ?
setup-intersections1 c' X" ^" t7 z% t
end
5 ~3 b. @2 A9 ~/ W其中定义道路的句子,如下所示,是什么意思啊?
+ P7 U. @' a+ p7 q0 j set roads patches with
1 J5 c7 l% d' J, a# h( t) a [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- a- r0 |: E3 W+ I
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ M7 G, F9 a0 Z
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? |
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