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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。
: j! N' n. W. q; Fnetlogo自带的social science--traffic grid这一例子当中,+ f6 G2 S. ?! A$ x2 D# z
globals" d/ u: K2 j5 F6 X1 F# C
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6 @: K* o* D6 x grid-x-inc ;; the amount of patches in between two roads in the x direction
! ~8 f" ? t+ I# H6 F/ F" I grid-y-inc ;; the amount of patches in between two roads in the y direction
" E, ?1 h; j! L) J1 l, k acceleration ;; the constant that controls how much a car speeds up or slows down by if
% ]( D& h2 W! L" N2 s: C( D; e ;; it is to accelerate or decelerate
; f4 V4 x# w0 M( R. f phase ;; keeps track of the phase a( c9 W7 |# D
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure8 ?7 u$ u' P' j9 e2 X7 k! [7 O
current-light ;; the currently selected light, R: N6 l2 ]8 k
% a9 P. |" T" v) x# L/ i ;; patch agentsets
! r* v0 V. v3 A, t) \ intersections ;; agentset containing the patches that are intersections
1 F1 v E0 |7 ?+ g. O roads ;; agentset containing the patches that are roads: {6 O8 ]: u" ]# @/ n
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turtles-own
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9 X0 E( B: m- R3 M, ` speed ;; the speed of the turtle) K( f7 h" a( H, Y
up-car? ;; true if the turtle moves downwards and false if it moves to the right/ U8 B' D& L- p# t5 w" r. v
wait-time ;; the amount of time since the last time a turtle has moved
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& `4 X) K- F0 v; Hpatches-own
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' v0 a2 f8 E* h; o7 p+ s. R0 g& ~ intersection? ;; true if the patch is at the intersection of two roads5 T5 w+ V6 H+ H. Z
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
$ x; H# s" W) L; x' S$ Y* O# ~ ;; false for a non-intersection patches.+ N0 k; R. ^* ^$ ?5 [
my-row ;; the row of the intersection counting from the upper left corner of the+ R. \- r* s6 v
;; world. -1 for non-intersection patches. R, {; g+ ^$ Y. i) c* p) Q" K2 q8 B
my-column ;; the column of the intersection counting from the upper left corner of the+ T4 Z: l/ d$ |! ]& m5 I4 C% D/ g* {9 M
;; world. -1 for non-intersection patches.: \4 g: j0 l# v" l/ i/ Q8 w" I# {
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
' K8 O2 Z% t4 a! Q" l# f' r* G auto? ;; whether or not this intersection will switch automatically.
+ n% @0 i& \ [1 A ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
. O& w; p( o# B9 ~, K0 \) G5 G;; Setup Procedures ;;8 }0 {. P3 d& q& z' ?& ?
;;;;;;;;;;;;;;;;;;;;;;, D! {/ |+ K b2 ~
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;; Initialize the display by giving the global and patch variables initial values.% f( g% H7 |* v) J1 g5 c
;; Create num-cars of turtles if there are enough road patches for one turtle to1 f7 m# b: C9 I
;; be created per road patch. Set up the plots.6 e3 t7 ?6 S c/ O+ v0 l% R
to setup
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setup-globals6 d# @& B% `5 U. S& \7 L7 Y- G
4 a: ?- e0 \+ ]( h8 Q ;; First we ask the patches to draw themselves and set up a few variables& ^2 d6 Q0 T0 o) s. C
setup-patches
+ k W% y! e+ p, v9 ^7 R8 |$ \. V make-current one-of intersections0 w) l6 y3 K: Z' l6 I! Z( y# Z
label-current
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set-default-shape turtles "car" B$ z% N( a2 v
& s6 R3 F0 ^. m$ t" s if (num-cars > count roads)3 P& p' q" \& m' L, E* ]& A6 t$ B
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user-message (word "There are too many cars for the amount of "
0 l: s) j' f, [) O9 A; u/ v; F "road. Either increase the amount of roads "5 l/ k( Y$ Z; g
"by increasing the GRID-SIZE-X or "0 |% s/ W( O X3 Y) T
"GRID-SIZE-Y sliders, or decrease the "
0 Z1 E! R. y0 y8 C* j# @ "number of cars by lowering the NUMBER slider.\n"* A1 P' C; x8 J1 ^, [
"The setup has stopped."); u3 I& c) {( @5 W: m9 T
stop
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}4 s1 @' A& r% B ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color' K2 V/ w/ Q! w5 _. ?0 T
crt num-cars0 S9 `; i8 o* o% ^7 Y3 Z$ X
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c7 S; d: ^* ?0 m6 Q( u) U setup-cars
, A6 M* E* t$ u+ h set-car-color8 w; ~& g7 N3 v( e- ]
record-data' \. j3 Z5 K" I1 H$ F
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;; give the turtles an initial speed
# D8 x/ T2 f9 e+ c$ \: a' W( F ask turtles [ set-car-speed ]
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% X1 d9 J' r( E+ O reset-ticks
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;; Initialize the global variables to appropriate values* j8 W5 l- `7 I( I1 Q L3 [9 V9 b) @
to setup-globals/ d n' ~2 \/ Q: L8 n$ q- t* E
set current-light nobody ;; just for now, since there are no lights yet1 K: q3 z( H" b$ S$ |* F8 y
set phase 0
5 G, C( _& b# I) m" h8 d% M set num-cars-stopped 0
" {1 w2 p3 x: Q0 t set grid-x-inc world-width / grid-size-x' o- ^! v: W" t( V
set grid-y-inc world-height / grid-size-y/ |7 r% a" z& C$ |& G
4 a' w5 [8 ~) ^) V; [ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
7 x4 l8 N' Y( g+ e6 ~) z set acceleration 0.099. N4 o% Q, B- @/ V: J6 w
end
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7 L* T# S- K$ _2 E;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 u, r- y* q$ K6 Z;; and initialize the traffic lights to one setting" G3 q4 z+ @5 P4 N2 s4 q8 q
to setup-patches7 K9 Q' v% M/ h/ O9 J* R5 A/ r
;; initialize the patch-owned variables and color the patches to a base-color6 v6 q& |' n: `) H0 \& y
ask patches
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set intersection? false4 m3 N+ |. _& [: h- Q9 r
set auto? false
9 g- q& C: M' H1 T$ c set green-light-up? true- d% Y$ T% `6 d2 h- l2 i
set my-row -1
2 J- l5 l2 Y* g2 [& m set my-column -13 W6 R3 B3 Z l' @
set my-phase -1
: o: u- J+ X0 e* h% F6 h set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets( f3 ~( f# `3 Y' G1 a5 }6 o+ e; D
set roads patches with2 f% y* K! F( ]; ?8 k! X9 {) f
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 u3 y: V) c4 H; M (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 Q) i9 H E. J; U5 C/ }
set intersections roads with; t% H( Y7 \ T& L3 }! [1 q& d
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and* u- _' o+ _* R
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]! U) I6 ^6 }$ U T- V
setup-intersections: _* ?9 ` ~* }1 O! D
end
. e' k6 {1 v/ D3 z. y/ a; L: @其中定义道路的句子,如下所示,是什么意思啊?4 }% e6 [8 s8 T9 P
set roads patches with( D6 v4 t, h. O
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) R0 o/ b; m' D/ V. A1 Z+ d1 G
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 @6 W7 ?5 |5 F6 o: i B$ Y9 G
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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