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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。* ]0 h9 H# F0 {" I' U' i9 i3 R
netlogo自带的social science--traffic grid这一例子当中,
* ]" R) e A+ `( r+ `& h; tglobals. _9 ? T- v* C4 c, M# H+ x
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grid-x-inc ;; the amount of patches in between two roads in the x direction
0 O6 G/ D8 H, f, W% K grid-y-inc ;; the amount of patches in between two roads in the y direction
; Z' T% j% Y. e' y* R3 J acceleration ;; the constant that controls how much a car speeds up or slows down by if3 N3 p- X' t' k
;; it is to accelerate or decelerate4 q* s7 b& m5 L- B$ W! w* t, L
phase ;; keeps track of the phase
8 l- X) `3 i. y9 k S& D num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure& J" V" w0 n/ t8 c8 Q, S
current-light ;; the currently selected light
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;; patch agentsets
; ~' {4 F3 o& E( h( c intersections ;; agentset containing the patches that are intersections
' R, F g2 _2 S5 q% T4 i roads ;; agentset containing the patches that are roads u7 a G) r0 W* V
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6 O$ J9 r* |' a8 F6 ], ^turtles-own* `5 j) g- F5 O0 r
[
/ d6 N" E7 ?4 w, u7 { speed ;; the speed of the turtle, q. c+ Q+ v. h8 W* F
up-car? ;; true if the turtle moves downwards and false if it moves to the right8 J( C% w6 R% L% u
wait-time ;; the amount of time since the last time a turtle has moved& U# g# T3 e2 N; c! Z' r( Y! s
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6 |( ^5 J& F1 y/ O6 l/ w1 upatches-own
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intersection? ;; true if the patch is at the intersection of two roads
6 p7 j' Q0 O# F9 }6 X green-light-up? ;; true if the green light is above the intersection. otherwise, false. O: ~# h; ?1 b
;; false for a non-intersection patches.
) H/ j5 Z! E/ k: C' H r my-row ;; the row of the intersection counting from the upper left corner of the$ ~$ m. E, p# R8 b
;; world. -1 for non-intersection patches.; ~4 b& R7 S( r" b; |& V- j# w
my-column ;; the column of the intersection counting from the upper left corner of the: ?" \/ N% b) D9 n
;; world. -1 for non-intersection patches.7 b# e, Z4 x- ]8 H0 w
my-phase ;; the phase for the intersection. -1 for non-intersection patches.) j* e- x( M9 T7 A# V4 i/ A( p
auto? ;; whether or not this intersection will switch automatically./ i# v: Z7 l" I9 V
;; false for non-intersection patches.
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2 J5 Z$ {; P6 h Y4 V;;;;;;;;;;;;;;;;;;;;;;
' r: Z4 n& E8 y% k8 T;; Setup Procedures ;;% V' y. N! g( Z8 E [
;;;;;;;;;;;;;;;;;;;;;;: W* M6 D; a! V+ g& f. k. X
6 Z( N( }5 {6 T1 U;; Initialize the display by giving the global and patch variables initial values.4 K: U' L. d. D! k
;; Create num-cars of turtles if there are enough road patches for one turtle to0 b5 I; B( ]; H x3 t
;; be created per road patch. Set up the plots.* p8 m- Q9 s5 o
to setup$ Y5 }" @9 b4 a( R
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setup-globals
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/ d/ Y3 b* w1 M/ r0 { ;; First we ask the patches to draw themselves and set up a few variables4 ^' R o0 Z4 ^/ ~$ ?/ O) V( e# b
setup-patches
/ |9 h: ~9 q- t3 L( S3 w make-current one-of intersections6 w9 }1 g& l! D
label-current
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5 C4 N) d& }6 n P7 H0 t set-default-shape turtles "car"
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: L* c5 D% v& b. Q; b: i7 E, B) b if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
$ l) u5 i8 p r! n) p "road. Either increase the amount of roads "
2 z" W/ ?4 |+ q$ x- ?2 V8 y5 _) f "by increasing the GRID-SIZE-X or "; ]; ^* V, J! b7 G) U; l) J
"GRID-SIZE-Y sliders, or decrease the "
" Z: S3 B9 j5 P; T6 ]1 q "number of cars by lowering the NUMBER slider.\n"
$ |5 E5 V3 s- A; F$ D; I; x "The setup has stopped.")# f$ \; `9 ?8 t6 L; D0 u- ~7 ^, J* z
stop+ X; \0 ?; k, t+ [7 P$ f* ]9 D
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
! p) I/ M2 h8 ]( J+ O crt num-cars, N+ u( e1 C; v7 D" ?8 m
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3 ^% L# ^3 R, R% d setup-cars
4 k; P$ v" E; i set-car-color. M5 c6 Z& L+ _% a/ g5 o
record-data
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; Q, ?. k9 f4 y7 p ;; give the turtles an initial speed0 Z6 l# F: m* _8 T' G' q
ask turtles [ set-car-speed ]
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, e5 u3 j j2 Y$ {: U reset-ticks
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;; Initialize the global variables to appropriate values
) r8 T: c- @- d8 ]to setup-globals4 S. f4 D8 G3 G
set current-light nobody ;; just for now, since there are no lights yet
- O% B0 T, g1 Y5 g0 l5 } set phase 0
; H( }( M8 p9 [. b8 D! h9 ~ set num-cars-stopped 0" l8 F; r. W2 B( Q# m. p
set grid-x-inc world-width / grid-size-x
* V( G: d+ [. I. Y2 X# M 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
4 q) Y4 Q: R' ~8 W" E: B$ ? set acceleration 0.0994 Q$ f1 I% x y1 w _
end* I' W9 G7 r) `" h8 Q, F
; ^2 ]. T) O) Z/ g;; Make the patches have appropriate colors, set up the roads and intersections agentsets,9 k, u/ c4 B% `# P' ` b1 m- A
;; and initialize the traffic lights to one setting
/ Y% s4 A/ q j, sto setup-patches
& q; W+ B+ c9 V3 X5 L ;; initialize the patch-owned variables and color the patches to a base-color
# ~1 h( l! S X! a4 f" p ask patches
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set intersection? false' v- B' f* {& ?( e4 g) M
set auto? false7 H2 v: k. W8 G; ~. F, T, t# k
set green-light-up? true
8 Z! r3 |# ~+ H! S! ]8 _! S' ~9 r( r; i% J5 K set my-row -1
0 R- H$ A2 Z3 B7 N) t set my-column -1$ ]' m. H* ?3 P6 \$ A: p, C
set my-phase -1
2 K" D, l$ u8 t& B set pcolor brown + 3. k$ M% |, Q+ B5 x; R) M
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; J3 J0 Q/ x$ w1 F c ;; initialize the global variables that hold patch agentsets. |2 D" ~1 f0 ^7 g% i+ H
set roads patches with4 l: ^3 b' i4 } v/ d: [
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 K9 a% ]! I7 U/ S; I, N5 w: x$ v
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 _$ J H% O0 R+ }$ H
set intersections roads with
2 f4 ^ M3 ?/ C5 W [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
+ q$ e! D. L# X% A" K& Z (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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* ~" i, z. e1 A ask roads [ set pcolor white ]0 b6 C5 s! J6 S* g
setup-intersections9 Z! s! H2 a9 }( R
end9 B# Z1 m0 `0 O
其中定义道路的句子,如下所示,是什么意思啊?% F( {4 p7 X8 `9 ^! G) @# ` Z
set roads patches with2 H, d8 \" \! }0 n
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" O n$ _! ~1 }/ a
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 _; t( D# F# r0 a. m
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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