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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。
5 m" X4 k7 @# l, s" {" D$ Cnetlogo自带的social science--traffic grid这一例子当中,
: ?, ?1 C) e& C( f7 yglobals: Y" F D b4 W9 @$ Z7 i# u% A
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grid-x-inc ;; the amount of patches in between two roads in the x direction
7 T4 G% G8 @- j. \ grid-y-inc ;; the amount of patches in between two roads in the y direction
& A+ R% {4 r ? acceleration ;; the constant that controls how much a car speeds up or slows down by if+ I i$ H" X0 Q: a
;; it is to accelerate or decelerate
3 ^. q6 C& A7 u, x. R0 E) { phase ;; keeps track of the phase
; ~- f& E% { t: c' L6 z7 Z7 ] num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure0 A0 l u9 ^" k9 P
current-light ;; the currently selected light
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* M8 g9 a( p, t9 G5 l+ v/ Y ;; patch agentsets
j; b1 T7 k; E' d intersections ;; agentset containing the patches that are intersections1 T1 B7 d; R/ c" B7 C9 x9 a
roads ;; agentset containing the patches that are roads
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3 I8 c# @" S6 T. \. s% k9 R% Rturtles-own+ T0 A! \' z/ ^3 k m" U
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speed ;; the speed of the turtle& D' _" O' R* q
up-car? ;; true if the turtle moves downwards and false if it moves to the right
8 S- T& x5 I( [! B+ E2 S( I8 J4 o wait-time ;; the amount of time since the last time a turtle has moved
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patches-own9 [8 F; G* p. k- L1 B9 X8 z
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intersection? ;; true if the patch is at the intersection of two roads2 z* X+ _# O% F- Y# o" L, N: a& F/ u2 _+ i
green-light-up? ;; true if the green light is above the intersection. otherwise, false.. J/ |0 e7 @7 G% I5 l0 t
;; false for a non-intersection patches.. P6 n6 Q( g$ Y% g2 K
my-row ;; the row of the intersection counting from the upper left corner of the
: ^( r$ g4 m. C) E" @ ;; world. -1 for non-intersection patches.
2 N$ [0 k% b6 L my-column ;; the column of the intersection counting from the upper left corner of the3 ?7 O( x# E1 `; v ~
;; world. -1 for non-intersection patches.0 K: p h8 ?0 Q% M6 J, B
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
- P) \0 `* J* i& ] auto? ;; whether or not this intersection will switch automatically., M" P% I7 C& @
;; false for non-intersection patches.+ [5 T3 A3 d5 z. C1 k
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* l- e x$ P' N' N;;;;;;;;;;;;;;;;;;;;;;( B8 i8 N8 R1 @
;; Setup Procedures ;;1 c9 J" E5 |& s. L. Y# R7 z
;;;;;;;;;;;;;;;;;;;;;;
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N0 S l) Z0 r3 G# z) x! k; _;; Initialize the display by giving the global and patch variables initial values.- W3 k0 D% Z, H7 A
;; Create num-cars of turtles if there are enough road patches for one turtle to
3 ?- \/ X. _ u \' ?! l/ X9 H' S7 c;; be created per road patch. Set up the plots.
6 p. J% A& M+ ^9 N3 cto setup2 u& @7 T! i' N
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setup-globals2 {+ [3 C* A3 W! }% l5 I1 c
7 P/ S, W7 D3 q1 b ;; First we ask the patches to draw themselves and set up a few variables! f! D( r4 U! t) Q k5 G
setup-patches
: c( l0 ?) T, @5 G make-current one-of intersections
( ~8 K7 E' t! ` label-current0 }. ~5 O! {- a6 f. f8 y
. } u7 r% M* o: F set-default-shape turtles "car"/ D' l* R- ^! N- x+ e- i" d
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if (num-cars > count roads)
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- `# e% {% P6 `4 l# @ user-message (word "There are too many cars for the amount of "9 |( Y: b6 x' ~7 n' G% [+ h
"road. Either increase the amount of roads "
- q' X! O# k, W. c "by increasing the GRID-SIZE-X or "1 F- Z& \, I8 f, ~# u$ U! |
"GRID-SIZE-Y sliders, or decrease the "
L& `) f! ~8 j8 m: D* ~* O7 c% m8 v "number of cars by lowering the NUMBER slider.\n"
. L3 D. ~8 }; w& |8 k4 l "The setup has stopped.")0 C' a! C0 n l, n9 \
stop
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/ u3 c2 w% P1 x2 ?- O ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
: J/ P2 _: I3 }- t; ? crt num-cars; F. f% u2 ^1 e; u
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$ h! X& i! g: Z1 W2 P+ f) W8 G* T setup-cars
% q! Q- _2 _+ U+ f* V set-car-color
. `; ~; j7 Z/ ~7 s& _ record-data
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! ?% Z7 `0 x2 A, q ;; give the turtles an initial speed
; i+ O: x- Q( i; a1 f# A: N ask turtles [ set-car-speed ]9 W/ q2 M3 i% E$ m
! [$ I2 r- u/ N ?; K" {, e7 R' d reset-ticks
0 _1 N, e+ z! c/ J! \end
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;; Initialize the global variables to appropriate values, ?! S: a4 A* \! f/ p
to setup-globals2 q' I% S, Q! ~0 V O O
set current-light nobody ;; just for now, since there are no lights yet
3 E5 p) s0 e/ v" ]6 E set phase 0
: @6 s/ ^( L, l$ F' {$ ` set num-cars-stopped 0" n# Y. t: p4 c1 ~
set grid-x-inc world-width / grid-size-x; k% k: q: y3 ^
set grid-y-inc world-height / grid-size-y% p3 p K X7 @7 V
9 V7 u8 ?* Y5 [3 y5 ^2 K ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
( B/ E* x {) |+ J8 l5 G set acceleration 0.099
* g8 ?- J9 e }+ kend/ s) Z: L, y7 Q' P2 N* X
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
' ?5 F! R4 ~) q/ U;; and initialize the traffic lights to one setting- x# E, M H5 w4 `) u& f& @# `& }
to setup-patches
S3 T- E( e n! q7 b4 L7 R, P4 ` ;; initialize the patch-owned variables and color the patches to a base-color# p, P) c* Z( w3 I/ F: y8 h
ask patches' U; }" D' T+ }0 }9 Q0 G& E2 r
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set intersection? false1 N& V6 l4 n7 B
set auto? false' [) G! i- u7 G: k7 H
set green-light-up? true5 c- _9 l& |8 {) }9 T: A: w; X! N
set my-row -1' |; g! w, Y+ c7 ?
set my-column -1
! H9 v, Q) o5 L0 c6 l0 N4 _ set my-phase -19 H0 x; s& H2 o [! T/ j. Z! |2 ]
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
' e" g8 N0 {$ I set roads patches with
7 y4 f# O* d/ n2 Q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, \8 U. l3 X% s8 U (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 j! @+ O6 t N3 V7 n set intersections roads with
- C& u, ^; [1 G& F [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and% o; A, w1 p" l# J
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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% Y& A$ `8 A" o# ^" W2 J! g" K ask roads [ set pcolor white ] V2 [" _5 V" H+ G- u
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?1 o7 @/ p9 G9 s8 E) I
set roads patches with/ ^+ {2 p2 d, R! y/ Y) E' n7 s
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) v2 P2 H" b' h7 C1 p9 |# }. d
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) F" h2 |7 d' \/ ~ h c
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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