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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。
& F7 H9 i/ o# m: j/ W7 G' l6 J3 `netlogo自带的social science--traffic grid这一例子当中,
1 [0 y3 m6 c1 Z8 c Bglobals( B: b' }7 S- r- x5 l% V
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grid-x-inc ;; the amount of patches in between two roads in the x direction
+ T+ w# q- P3 k Q) H. y) q grid-y-inc ;; the amount of patches in between two roads in the y direction
2 O* k* K: M. O6 v) I9 s acceleration ;; the constant that controls how much a car speeds up or slows down by if, ~% n: X6 u$ [* H! e$ S" w
;; it is to accelerate or decelerate
0 v2 E3 A2 W( _8 g: U1 R phase ;; keeps track of the phase
- ]6 I; [, D' D num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
, {. u2 c V! a9 d Y1 _- G' x current-light ;; the currently selected light
+ n I2 L; d8 x
/ M. U7 l2 t. r( l( e ;; patch agentsets
2 ?& |; `. X7 Y: y% n( B9 H3 ?. u intersections ;; agentset containing the patches that are intersections' r: s) t7 m3 e' j! V
roads ;; agentset containing the patches that are roads
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( I/ Z8 N# [% D+ oturtles-own$ z/ t4 g- T n
[
- s% u0 |; c, B# n7 n: ^3 F& K' U speed ;; the speed of the turtle& a: {+ S+ m* q( f. O1 H r
up-car? ;; true if the turtle moves downwards and false if it moves to the right! W) V+ x1 d4 s7 F+ h9 _
wait-time ;; the amount of time since the last time a turtle has moved6 G8 {# `# `2 Y1 `. m. ~0 f
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7 B4 t# r! @6 L [ Z ~patches-own3 u' Q5 r% P+ D* D7 I
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# Q% D# q( p: Y% H intersection? ;; true if the patch is at the intersection of two roads0 i5 X d( u' i7 m) I4 w
green-light-up? ;; true if the green light is above the intersection. otherwise, false.9 k' U) S: b+ G$ M D2 o, C) R- D9 q, v
;; false for a non-intersection patches.
* k3 |) T: E, \' v# z d my-row ;; the row of the intersection counting from the upper left corner of the
/ d0 @: L8 E7 h+ a ;; world. -1 for non-intersection patches.* v, i& t r+ Z
my-column ;; the column of the intersection counting from the upper left corner of the
: O( ]5 z. Q( J: ~8 l ;; world. -1 for non-intersection patches.& F) k5 h3 P. V a1 \* a& u7 S8 s
my-phase ;; the phase for the intersection. -1 for non-intersection patches.' K$ d; G! P- K; _3 d
auto? ;; whether or not this intersection will switch automatically.5 g/ Y" k0 j6 X2 i# O1 J
;; false for non-intersection patches.+ m4 c" F3 R% z! d. ?9 K
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;;;;;;;;;;;;;;;;;;;;;;+ }) N' R3 k# l" u
;; Setup Procedures ;;
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9 X4 z& O9 C H8 k;; Initialize the display by giving the global and patch variables initial values.: o# u, h( V0 W9 w6 b0 B5 ?7 ` G
;; Create num-cars of turtles if there are enough road patches for one turtle to
+ k" ^4 }8 D3 n2 R; Y( \;; be created per road patch. Set up the plots.' [4 Y7 X; Y U* T
to setup
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setup-globals
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. o. i+ K7 D% ^) Z! K ;; First we ask the patches to draw themselves and set up a few variables
1 U) H" Y9 x5 S6 g setup-patches/ w# b8 A$ E3 P
make-current one-of intersections. P; s1 f( E" Y* i c' }5 E
label-current& i1 N1 e; _) Q
" p2 D+ N7 |3 r7 s set-default-shape turtles "car"5 L1 L+ M/ y7 L! a- K
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
* q% X6 g( w( Q3 o, E& |! F "road. Either increase the amount of roads "# `( ?+ J" v: G; E0 W/ M# Y
"by increasing the GRID-SIZE-X or "& W' y$ a" \ C5 U- G* Q0 W0 l
"GRID-SIZE-Y sliders, or decrease the "
4 c! {$ Q. o3 A" N0 F "number of cars by lowering the NUMBER slider.\n"
4 l" X D5 @8 Q# s: h& P$ ^ "The setup has stopped.")
`# r- O" k5 J# D stop& ~5 E* ?1 a: Z0 i! G1 Z4 J4 B
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
+ v% C. Q+ z% R7 `% c8 c* I crt num-cars4 F/ C( }9 L6 p# C) e# t
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- M1 y* }! v: z: v f& c/ y+ {3 q setup-cars, O- g2 j& ^( q* S3 U* v+ X2 _
set-car-color
. s+ M: f2 N: N& X# Q* Y( v! G record-data
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;; give the turtles an initial speed
% g# @0 b+ w$ o1 p1 t( i& D% ? ask turtles [ set-car-speed ], d* G- S# u6 A
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reset-ticks" _6 u( d9 m1 N: E3 F! {1 u
end
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# r& j" u0 |. O( y& B8 d/ a, t;; Initialize the global variables to appropriate values
, f/ \( B- c* i* v! U) dto setup-globals% @: `- ]7 O- V8 X, Y
set current-light nobody ;; just for now, since there are no lights yet
2 D& w8 P$ r" s! I& u3 G# [0 G set phase 0- P) Y8 x- O* P) K# y! k! F
set num-cars-stopped 0
; r$ F- H; `- v, A s set grid-x-inc world-width / grid-size-x$ P/ a# s5 R5 U- Y
set grid-y-inc world-height / grid-size-y
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6 c7 ^: Y- ]* U/ a: ` ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary H+ T& @- ^- I
set acceleration 0.099% J+ u) X! }( P4 I- s$ i, Z
end- ^/ D2 G0 Y) [& T+ w0 x
6 @9 h# [* s# ~1 X. ~;; Make the patches have appropriate colors, set up the roads and intersections agentsets,* t+ W0 N8 Z. ]0 |0 }- F
;; and initialize the traffic lights to one setting
( v0 d1 C3 @/ Cto setup-patches
, N. V" W& m0 z0 A ;; initialize the patch-owned variables and color the patches to a base-color1 E$ D' L" {% i$ t# c
ask patches% {0 v. v1 X5 `% ^, R
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set intersection? false1 z- x4 s) p( h! j2 f7 b- T7 Q `
set auto? false
: J2 K. [" z- d. g# T1 O set green-light-up? true
`+ C3 h5 I9 w) A set my-row -1& C4 x" [- o- ]/ X$ u# ^, {
set my-column -1
! i( ^& Q" j+ |/ Q+ v set my-phase -14 q' D \1 u" I+ p' ]0 o
set pcolor brown + 3
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! M; A$ e4 H& I& K3 R: M9 K ;; initialize the global variables that hold patch agentsets' o/ a! x/ H. ~3 Y; j8 P
set roads patches with
3 B/ z( C5 t: R- {7 v [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ d u( M N: ]$ \# m
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 x1 I8 Z i! E7 k2 C
set intersections roads with
/ ]6 P6 y3 i. }4 S( F' k* p [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and; \4 C: G. I: B. F" m" C' n
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) U# P9 v" m* @7 ^- T
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ask roads [ set pcolor white ]' Z# C/ r$ ~) N" ~2 k9 l3 C
setup-intersections
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$ K, t$ ]6 p- i6 U) g其中定义道路的句子,如下所示,是什么意思啊?
3 d4 m) |% w) l, w set roads patches with, k, d# Q3 |9 p* _
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* }2 Q" p; o3 U/ l9 K (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 j" ~5 F: H; i! _5 Z/ E6 m7 t
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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