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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。
3 F J& e9 [1 A# T0 fnetlogo自带的social science--traffic grid这一例子当中,
' o! m9 H0 q& ^, |globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction2 x+ @6 P t! l
grid-y-inc ;; the amount of patches in between two roads in the y direction
+ ~, C. \, Q3 }! W% k/ h0 a acceleration ;; the constant that controls how much a car speeds up or slows down by if
7 ~( u9 L2 X/ }- Z ;; it is to accelerate or decelerate
& q: Q7 X) J; d& ?9 O' J3 \ phase ;; keeps track of the phase' N4 ]3 m2 Q. K
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
, L8 z& r2 ]8 I* h& @# Q( P current-light ;; the currently selected light5 g3 q( P5 B( f7 \
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;; patch agentsets7 y( p5 [) E; S3 N# m0 P4 O
intersections ;; agentset containing the patches that are intersections- ~( S6 ? _/ B+ C, v- k
roads ;; agentset containing the patches that are roads
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]( r( v- ^1 h' J4 fturtles-own# q$ I, m' ?. X$ U. m
[
, x. k, j8 Z! q" V/ g4 g4 o speed ;; the speed of the turtle
" J2 r; q/ S. t( r% J up-car? ;; true if the turtle moves downwards and false if it moves to the right$ f4 Z) a: Z6 q9 H |: D1 V0 S
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own) M3 a/ T1 ^+ n4 v
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intersection? ;; true if the patch is at the intersection of two roads3 C" H& p7 v. }
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
6 y' j) ]9 L/ `0 v2 B& s" s% N ;; false for a non-intersection patches.
, F- ^1 A% T D; W+ I2 a' L my-row ;; the row of the intersection counting from the upper left corner of the, F8 b) R* f) U' H
;; world. -1 for non-intersection patches.
) |9 ~) o% n7 B( a my-column ;; the column of the intersection counting from the upper left corner of the
' Y) q. C! G( L# p ;; world. -1 for non-intersection patches.
6 K/ F" I& x H, w: r- H/ z/ f my-phase ;; the phase for the intersection. -1 for non-intersection patches.
" A0 D" q0 B5 e* @& Y' e auto? ;; whether or not this intersection will switch automatically.7 Z5 V7 F F) }/ S3 o' x
;; false for non-intersection patches.1 E$ S9 [% U+ d) i2 v4 D& w' K
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3 y$ G+ P2 [% k0 |% R- N) z* j9 A' C;;;;;;;;;;;;;;;;;;;;;;
p" K. V+ `' b;; Setup Procedures ;;
2 m9 r% D, {2 S( q( B: H% u;;;;;;;;;;;;;;;;;;;;;;5 d1 c5 X3 w# \0 K0 Y7 }. m# |: [
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;; Initialize the display by giving the global and patch variables initial values.
8 x+ T# v H2 t* e;; Create num-cars of turtles if there are enough road patches for one turtle to
% q* Q* K* \ p ?' u3 E9 r;; be created per road patch. Set up the plots.
& E0 w' F; X) Z1 D( Nto setup% ~) x+ k }/ m& p
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setup-globals) p0 @; {3 P c, |$ ~* L) l
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;; First we ask the patches to draw themselves and set up a few variables1 c$ d( G& n, O* L8 e
setup-patches
: A; N4 \, i6 e8 j2 t2 \ make-current one-of intersections! s6 P8 O8 \3 i* I' M( X, Z. \* y
label-current
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set-default-shape turtles "car"% W# Y( v! T. Z* U$ A
6 g# T" D$ m" z/ ^5 M: f# u# c, Z/ Q if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
( h: t' S9 `: i6 B6 w1 f "road. Either increase the amount of roads "4 @/ D6 Z5 C! i( Q* U/ q
"by increasing the GRID-SIZE-X or "! {! {' A7 s. h
"GRID-SIZE-Y sliders, or decrease the "5 T3 N5 y! V# P7 k# T- Q2 O
"number of cars by lowering the NUMBER slider.\n"' e& y; k U" x3 n. F( {$ _5 n) _
"The setup has stopped.")0 K9 @, t6 ?8 n9 R8 n* }8 S
stop+ \% @! O, X ]
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( h1 u4 p: B3 p2 F7 y1 d6 p' m ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color+ P# p$ S7 f0 A/ v7 T" u3 V G+ F
crt num-cars; v8 h6 h' l! f# f
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set-car-color
) x5 r, x9 _( S+ k- _ record-data
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0 J" T' J1 D0 ^, w( H ;; give the turtles an initial speed) r3 L" j% h3 U- R
ask turtles [ set-car-speed ]& A( e- V- t; _
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reset-ticks" Q4 _4 x2 X; A: p; v; I
end
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5 H6 n% ^) ^5 C" I7 j;; Initialize the global variables to appropriate values% p! f7 s& q5 F
to setup-globals
3 X8 Y) h2 L1 ^$ \ set current-light nobody ;; just for now, since there are no lights yet# \# D! @5 X8 T! G# X# z
set phase 07 T. Q! {4 X8 H! V. h
set num-cars-stopped 03 J3 U3 L. V$ w5 F, U# ~" Q
set grid-x-inc world-width / grid-size-x
5 t l$ ~( ]6 G set grid-y-inc world-height / grid-size-y
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7 }; f% W( Z7 _" {. E! }% ?8 c ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
4 v! ]9 e/ b6 c4 D: v$ s; w( x* ]7 c set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,+ U. d" T% l4 D! U5 S- |7 P0 x
;; and initialize the traffic lights to one setting
6 N* x: \2 A1 a cto setup-patches
) { J4 N( k) h2 V; r ;; initialize the patch-owned variables and color the patches to a base-color
! B, o' J0 B3 i2 @# C- [ ask patches
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2 D h; p8 m* s2 v set intersection? false* u1 |- q: ]1 D% M8 T0 m/ g! f
set auto? false
% X7 i8 _0 |" D1 w& r0 X set green-light-up? true. x- B& _9 O- A4 A: S" a7 a" g
set my-row -1
3 h2 A [1 o" D9 q( L" F set my-column -1
9 o2 q3 H; V6 Q+ b8 [% \ set my-phase -1
3 X, e8 v: ~% L. P3 j3 K8 F; o set pcolor brown + 3' b2 R. F& m9 X, n+ }6 o
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( G" a1 \0 H( `# T% p9 j" Z ;; initialize the global variables that hold patch agentsets
& G% a+ W# V) }/ _5 i$ a- N) I set roads patches with
( x# h( ]- S4 p5 p8 Y: h5 D [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- @: u2 `1 r% H( e (floor((pycor + max-pycor) mod grid-y-inc) = 0)] `, d8 C+ C- k- X7 F+ Z5 X, Y( H, \
set intersections roads with3 R% K: S* Y: C/ I/ c
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
" d: Y- E" M& o! y. J (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' p! j* {2 r& {% T2 M4 `, n
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ask roads [ set pcolor white ], t1 j4 g" p! L4 l" S) `& P+ _
setup-intersections
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- ?3 g g+ B8 r1 f) \+ J其中定义道路的句子,如下所示,是什么意思啊?& G1 u8 J" b3 y5 W
set roads patches with) b [* {6 T3 q0 d% X% {
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% w5 `8 W3 X- |( Y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* u2 ^+ E1 T( N8 v5 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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