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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。1 F7 F: |# \! }3 {, R; b# y
netlogo自带的social science--traffic grid这一例子当中,2 m& d: P. f; S7 m8 ]" I$ h$ w# N
globals2 R# g; H, N9 B* r
[
9 Y% s( T8 b; P$ I/ p4 I6 ?- D. D- v grid-x-inc ;; the amount of patches in between two roads in the x direction& {- c& s2 b- C X# S' q* x
grid-y-inc ;; the amount of patches in between two roads in the y direction8 d+ ], h+ G4 k0 \4 S
acceleration ;; the constant that controls how much a car speeds up or slows down by if
. `/ s' w! o6 F O- N9 n+ ?1 T ;; it is to accelerate or decelerate
% Z) K2 v5 E' ~ [ phase ;; keeps track of the phase
3 m5 A! f/ Y5 h: b, P2 D- ? num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
$ w0 ?+ ?( {- I" V current-light ;; the currently selected light
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;; patch agentsets8 ~$ b/ n! P& B: G- R$ X; r
intersections ;; agentset containing the patches that are intersections
. {; v; b% i! P% o roads ;; agentset containing the patches that are roads
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/ _0 M. |$ K- F; {! u- ?7 qturtles-own( U# p; G* [! m) b& v0 ?
[+ \1 |2 R% R3 M" l3 m
speed ;; the speed of the turtle
: \' P2 U7 E$ c6 f! K: i up-car? ;; true if the turtle moves downwards and false if it moves to the right
& B; K3 a' ~: b wait-time ;; the amount of time since the last time a turtle has moved
& S* f6 y, O4 R+ [8 m]4 U ^, U% c E- N/ R0 m
& T. _7 t6 R/ n; s& m3 K( `! Epatches-own
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intersection? ;; true if the patch is at the intersection of two roads
2 _! D5 v6 U: S green-light-up? ;; true if the green light is above the intersection. otherwise, false.) ~9 `: w; E1 R) W' j5 W
;; false for a non-intersection patches.
# d) K9 K: X9 v8 U- x7 a0 M my-row ;; the row of the intersection counting from the upper left corner of the5 d- Z" R4 N3 [) G- V d, l
;; world. -1 for non-intersection patches.
. R% Y9 d6 @) s5 W my-column ;; the column of the intersection counting from the upper left corner of the
6 s0 ~+ }% |( @! l ;; world. -1 for non-intersection patches.
: P; {" C Y' Y {; [ d+ E my-phase ;; the phase for the intersection. -1 for non-intersection patches.3 H- w+ y: O* ?, k6 q& X6 ]
auto? ;; whether or not this intersection will switch automatically.
/ s5 u8 J9 f5 }4 _( Z2 W ;; false for non-intersection patches.; @( J8 `1 T/ i ?
]
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;;;;;;;;;;;;;;;;;;;;;;# d5 |! a8 H% |7 k& y9 H0 ]* D
;; Setup Procedures ;;
4 b( Q! q' Q- Z/ }1 f. ^+ T: f; h;;;;;;;;;;;;;;;;;;;;;;
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9 X+ F) M+ R7 e/ i. D5 G" z. h;; Initialize the display by giving the global and patch variables initial values.
5 C, m" M* y# v1 C3 C! b4 R6 T;; Create num-cars of turtles if there are enough road patches for one turtle to
h' |6 W7 I: E;; be created per road patch. Set up the plots.
5 Y6 k/ g0 Z3 E- X& J/ oto 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( z) C0 l& c, `. T4 S
setup-patches
: Z# @8 f9 m( q% D make-current one-of intersections' k' I1 Q- t8 i. e9 h' ], ]3 n
label-current, @* [, B) \9 V, A4 p1 S3 K* d0 e+ o
) f z- C5 z+ V; W set-default-shape turtles "car"7 { X; l0 {! \' ?% l) b
$ J( D' t. U1 ] if (num-cars > count roads)
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9 j* U; a4 e$ B* O. K$ m/ \ user-message (word "There are too many cars for the amount of "
. m$ z. f5 j0 R' ~: b$ j3 F% K1 f; ?' r0 \ "road. Either increase the amount of roads "9 A) \, W9 g+ \" x% ^) E
"by increasing the GRID-SIZE-X or "
, m7 z7 V& b7 U$ P( y "GRID-SIZE-Y sliders, or decrease the "
: |7 `7 O/ B' s3 x "number of cars by lowering the NUMBER slider.\n"7 t V$ q5 x8 v# @$ G
"The setup has stopped.")
6 J' s$ Y( ]* k4 |( {1 A stop; [- f* c% r7 |- @! |9 O* U3 j
]
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, N. S6 t! V% z# l* t8 {& l+ m ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color0 {6 R' |& V- G
crt num-cars' n$ V9 I/ p% g7 @, x) V
[
$ h7 t+ n# ]# y i2 \ setup-cars& M% w; s' |* ?/ T$ R6 ^
set-car-color: G- ?' j! X/ @
record-data
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/ W* A }& Q) R% i! p9 ^ ;; give the turtles an initial speed
. o1 P3 j4 B. t2 r. B8 ~% ^& k ask turtles [ set-car-speed ]) c( L% w& _! {& J
( y' u: Q6 ?0 G3 z+ K- K# j; n reset-ticks) Z! X* Q. v3 n; T& }/ D5 m6 {& O
end5 X' I* B8 I) `
# W$ b: y, Q: q& c4 `;; Initialize the global variables to appropriate values h Y/ z1 O9 M6 t' t
to setup-globals
7 z2 m$ {) L$ R3 O& ^/ u. S set current-light nobody ;; just for now, since there are no lights yet
, b- g* f0 I k- {! x- Y! r1 } set phase 0
! I: K5 s( p9 p: y2 r6 g set num-cars-stopped 08 Z q9 y$ k O! z6 c" r
set grid-x-inc world-width / grid-size-x
& L) X) o x5 f# O, S set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! k) U8 i1 c+ J1 t; j; d# B set acceleration 0.099) V3 j2 L/ n! D5 G7 C. S
end- G: Z4 P5 {! Y3 L9 W0 V5 `
" }: ^; m$ A5 ]% ]( u;; Make the patches have appropriate colors, set up the roads and intersections agentsets,5 b! t+ k8 [- S! z# |
;; and initialize the traffic lights to one setting
/ L# o) P m" ?- S6 T5 l9 [: qto setup-patches$ _" v8 v/ \/ v9 ~" f
;; initialize the patch-owned variables and color the patches to a base-color
9 ]* y9 ?' c6 E+ p ask patches4 H, s5 g% p' g% \; M" v
[
2 A$ o+ |% S8 } set intersection? false' a. ~1 M. s+ a! j
set auto? false
5 [, `) r/ T$ ?6 ` set green-light-up? true
i% A/ `2 g' |$ Q set my-row -11 \3 n" X, Z: p- B# {; c2 D4 G7 Y
set my-column -1 R4 e% t$ y& M# g0 |5 e
set my-phase -1
3 u Y1 ~2 Z: H( ?! E# J2 [" D0 S set pcolor brown + 3# V% v1 r# E9 `- {
]
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;; initialize the global variables that hold patch agentsets3 R7 P& n/ `3 \1 U
set roads patches with, J" S/ [* u* i6 D( [4 [/ X4 I
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 Z% H7 e6 S' D" k4 F (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& l8 o: m$ g5 m; [
set intersections roads with" A1 z: X' C! E3 t3 p0 z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and+ k j8 k! m9 E/ N% h' d1 F8 d
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 \; Z, c% t& ^$ _
1 B0 ]+ o/ ^; p, l; p ask roads [ set pcolor white ]
5 D# O" [7 L+ ]2 ^( V6 u setup-intersections' w; n% I) y) z. ^! w- ?
end& \+ d' G6 O, ?4 M, `
其中定义道路的句子,如下所示,是什么意思啊?& z7 d7 V2 y" ~) M+ n& w0 w- }+ Z
set roads patches with* V' z9 h$ j7 [6 C# Z, G
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, b- m- g' S! p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
~0 ~# B2 @9 p; 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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