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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。
9 A% B( }2 F0 |2 ]$ n+ @netlogo自带的social science--traffic grid这一例子当中,
- O% [2 Q: M! C; x( A Gglobals
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9 o' z4 o$ ?* J% d/ v# o grid-x-inc ;; the amount of patches in between two roads in the x direction) }: Y6 ~9 L$ R; L, {1 {8 D
grid-y-inc ;; the amount of patches in between two roads in the y direction& k/ O( u# G6 g4 i
acceleration ;; the constant that controls how much a car speeds up or slows down by if
# ]" B2 C* z$ U ;; it is to accelerate or decelerate# c1 d+ v F0 q. j4 f
phase ;; keeps track of the phase! \1 e8 C- d9 k$ T3 [/ `. p% o
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
, P. |% o1 X# {, z8 ~ current-light ;; the currently selected light6 b) F, L, o4 _
5 n! n; s. f% u; R( P0 o1 S ;; patch agentsets" b1 ?! g P; W6 [
intersections ;; agentset containing the patches that are intersections
9 W! [5 c6 ]7 \; H- }# | roads ;; agentset containing the patches that are roads
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! A% B2 x' R/ \5 ]" kturtles-own
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* [7 T4 j! ?9 n- G2 C" N speed ;; the speed of the turtle/ ]: v7 w* `& m! Q
up-car? ;; true if the turtle moves downwards and false if it moves to the right7 p) l x* x; V s9 O" |
wait-time ;; the amount of time since the last time a turtle has moved9 W1 Y' B; J; Q- Q6 d0 ~
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' V% ~4 e( n1 m9 i+ W8 V0 opatches-own
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intersection? ;; true if the patch is at the intersection of two roads
8 L- a+ U6 ?# k8 n green-light-up? ;; true if the green light is above the intersection. otherwise, false.
{8 W( ]* X8 G! b* h3 Q/ F ;; false for a non-intersection patches.
. l5 c' ?( p5 |8 i2 b my-row ;; the row of the intersection counting from the upper left corner of the0 h; v7 E2 k* s3 n9 w6 D/ ~' U
;; world. -1 for non-intersection patches.
3 m* d2 d; g: q! W' O; m* f my-column ;; the column of the intersection counting from the upper left corner of the
. ^; r2 K8 M" j4 z ;; world. -1 for non-intersection patches.; N9 r `8 Z9 l* U% t' K) j S
my-phase ;; the phase for the intersection. -1 for non-intersection patches.5 D$ A1 q0 \- r' `. e
auto? ;; whether or not this intersection will switch automatically.. u& x2 g U! {! j# {* w
;; false for non-intersection patches.4 O2 U& N u$ m2 d" i7 M( m
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;;;;;;;;;;;;;;;;;;;;;;
! w K. {% r6 o& V$ P" g;; Setup Procedures ;;4 r4 u/ Q+ K. D
;;;;;;;;;;;;;;;;;;;;;;
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% Z5 X$ g6 @7 W$ @# I;; Initialize the display by giving the global and patch variables initial values.
+ |0 P- b, v: k# r' l2 };; Create num-cars of turtles if there are enough road patches for one turtle to1 _7 S* F$ h: O P
;; be created per road patch. Set up the plots.% [5 f: T @! F7 X# @# L. `# T
to setup
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
. L7 S* n K7 Q6 [- g" B setup-patches" J: A. m) t" `7 }0 F/ C$ }) t
make-current one-of intersections
0 \- D1 C8 P2 O8 v0 D# b5 k9 |5 I z label-current, _: a o" I' \# W2 d \
( f/ t; Z: O% j! z# C9 B3 q+ t' ^ set-default-shape turtles "car"" r: C) v. @7 g( }: P0 T% S
% e' B6 [5 X8 U% H9 @ if (num-cars > count roads)+ [0 d6 h5 ~3 W8 d+ @" g, v9 v' k
[
. e) T/ r1 g2 \. w1 ^- k user-message (word "There are too many cars for the amount of "
3 L( E' D. \/ Q# u7 m "road. Either increase the amount of roads "& r! g5 ]2 c# N
"by increasing the GRID-SIZE-X or "# |* |6 D, j R0 N/ [3 d1 b) q
"GRID-SIZE-Y sliders, or decrease the "7 `. N- P+ W5 A2 ~2 N0 @
"number of cars by lowering the NUMBER slider.\n"
! s: F- n* G+ r0 s" \ "The setup has stopped.")5 i. b' N( H$ X! a5 J) d& v2 R6 L
stop* j; H, e$ M+ d/ ^( M
]
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8 I( X5 X4 }! x3 \! K ?, D ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
& b5 e3 u" o, W) a0 I q) i( l crt num-cars/ \' A6 ]8 i6 X( u! h; ?
[
3 b9 {# ]+ N% l+ H- [& I" j setup-cars9 {! [6 Z+ e3 @& V5 Z& \
set-car-color
3 {- Z1 R0 V$ r) r* V) v/ Y record-data
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;; give the turtles an initial speed
9 Y# l* M1 q$ A7 \ ask turtles [ set-car-speed ]+ `- B+ }/ V# s q
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reset-ticks
% A" H3 u8 P# r" K1 x' Nend
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;; Initialize the global variables to appropriate values2 S4 T' O& J |$ ~! _4 | s5 Z4 ~
to setup-globals
1 }8 B, I t$ L% U; S% N5 T set current-light nobody ;; just for now, since there are no lights yet4 D# f7 t) }3 [& a0 q, [1 F
set phase 0
# H. w! t; T- _6 n7 s& x( x* K. u set num-cars-stopped 0) R6 r6 d+ _: r: v* w! G; O+ @
set grid-x-inc world-width / grid-size-x
6 f) j9 p5 K; T8 U; r set grid-y-inc world-height / grid-size-y$ O$ c. O6 \7 w! {: M9 L+ P
+ h( J e6 f4 l7 I% K ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary& e2 P0 s) g# I( H" D- s
set acceleration 0.099% P: k+ Y' W9 e; t
end
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3 G, L7 H3 |9 c4 `9 L# k' ^;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
- a, d5 K% \; K2 P. W' J+ f;; and initialize the traffic lights to one setting1 T3 {7 g8 h C I/ L9 _ V6 P2 n
to setup-patches/ W: A, h' R* ?* S( x
;; initialize the patch-owned variables and color the patches to a base-color. T; D9 n& y/ I) J3 q
ask patches
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8 ^/ a M3 n+ l3 v1 } set intersection? false/ b# K2 B1 d) P' ?7 f/ [5 t2 F
set auto? false* D( B3 b. O3 S7 k+ O( S! q
set green-light-up? true B3 ?" Q, M9 R' c- a9 H. L/ i- T
set my-row -1: Z3 g# S/ r ?' S
set my-column -1' D5 {7 h0 D2 z3 Q4 v
set my-phase -1
$ E3 { R/ F' X) Z. r9 \ set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
I" b2 @- S. F7 } set roads patches with# D& u( J3 P/ D, u" u3 q7 M
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# U& H. O! {0 K (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ r4 l4 r8 D Z; L) _6 s set intersections roads with H) y* S+ w7 }% m+ r0 ~
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 r, ?* a) |$ J9 \: G( O (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
0 m0 [& u! p- v2 j. E1 Y 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?) p& T8 |7 }7 F% u: [
set roads patches with
- {+ L; y4 R- ^- Z( m/ u) z' U [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ q9 }; c) b& S" m% \
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- S4 N& U& I( U+ {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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