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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。
; j3 t% [: y9 n2 m0 Snetlogo自带的social science--traffic grid这一例子当中,' H6 F) A" d' {3 i5 G3 U* s
globals- y/ I3 c3 p- Y/ Y* P
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grid-x-inc ;; the amount of patches in between two roads in the x direction( g8 ]; a6 B& o7 ]
grid-y-inc ;; the amount of patches in between two roads in the y direction
- H7 Z4 w5 F* c9 S9 `1 ^3 o acceleration ;; the constant that controls how much a car speeds up or slows down by if
: D: J3 }/ D. A ;; it is to accelerate or decelerate4 @" s9 o M1 D, v7 R
phase ;; keeps track of the phase: l2 f# t% G% {6 z3 f3 ^0 v8 |
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure+ ~3 ?0 [ u3 P" h8 f
current-light ;; the currently selected light. i) x0 L' d/ G ]9 Z! q: F7 x$ m
S0 j, U( a& O# e/ M3 S8 h- S5 S ;; patch agentsets
0 I6 F) i' D2 F/ V% p intersections ;; agentset containing the patches that are intersections
& f; w& `% J4 C4 i6 l: [ roads ;; agentset containing the patches that are roads
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turtles-own# k% G, G, @" D6 o# D- A+ F8 I
[
5 ~. j. ]+ s" t% n5 }" i speed ;; the speed of the turtle K3 R+ n$ \' b/ ?
up-car? ;; true if the turtle moves downwards and false if it moves to the right- Q4 e0 }$ S5 o) b# w+ K8 O
wait-time ;; the amount of time since the last time a turtle has moved9 Y( G/ i% B0 V9 `
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: g% B# a' S" j0 o$ R7 Epatches-own
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intersection? ;; true if the patch is at the intersection of two roads
1 U7 c$ ]$ y, i/ s green-light-up? ;; true if the green light is above the intersection. otherwise, false.
4 r- }! V4 ~4 ?4 q ;; false for a non-intersection patches.
- @7 i1 @1 O3 ?9 @: L my-row ;; the row of the intersection counting from the upper left corner of the5 N Q. ^, r! w! E: I
;; world. -1 for non-intersection patches.
* `/ Y. v) O) P7 t; i4 i/ E my-column ;; the column of the intersection counting from the upper left corner of the
: ]7 }9 e$ X }# i+ B `- D ;; world. -1 for non-intersection patches.
/ y8 c5 n e& ?- b8 i my-phase ;; the phase for the intersection. -1 for non-intersection patches.
8 e8 i" S0 V5 Y) }+ V0 S auto? ;; whether or not this intersection will switch automatically." [/ i7 Y& J. c% P j' g X; e
;; false for non-intersection patches.4 |# w1 R3 g. Y2 p; s) S
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;;;;;;;;;;;;;;;;;;;;;;
, _. P6 w, u6 f t5 J" Y, c;; Setup Procedures ;;
0 E U: M9 _: C5 Q' ]$ I: z. H;;;;;;;;;;;;;;;;;;;;;;
z- S6 n" r+ L* J( S
2 P, z* V$ E" [+ ?& I) S;; Initialize the display by giving the global and patch variables initial values.
) W$ u6 i, I6 b% Y;; Create num-cars of turtles if there are enough road patches for one turtle to
/ k0 B% S, `" y, D. F! J9 @, C* a& @/ |3 T;; be created per road patch. Set up the plots.
* a$ ?1 w9 X+ Rto setup
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7 |% k+ p1 O1 E @9 J' o$ ] setup-globals
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;; First we ask the patches to draw themselves and set up a few variables5 i. i+ u4 v y* W" ~4 [
setup-patches0 u2 p0 g8 ]" i( H$ R
make-current one-of intersections
) C% N2 F0 `* G. c" c& H, R) D label-current
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- C2 p/ b0 O2 ~" [1 O. b; y! w set-default-shape turtles "car"
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if (num-cars > count roads)
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) V, X! L) ]- ?$ {, }5 Q user-message (word "There are too many cars for the amount of "! w' ]2 x0 E" V* l: n7 ^
"road. Either increase the amount of roads "! S" Q; S- K+ U7 @: A8 d2 U4 [% ?
"by increasing the GRID-SIZE-X or "
2 P, I( x% E' g# d2 q1 k "GRID-SIZE-Y sliders, or decrease the "5 r( ~& c8 [7 l5 m I9 h" U
"number of cars by lowering the NUMBER slider.\n"( p' V# M! K! s4 O
"The setup has stopped.")
6 d* g2 w w* ^5 @# u2 ? stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color, a, @1 L" C+ |8 @: m
crt num-cars
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setup-cars, r4 C6 p# \5 P, c# w' `2 e
set-car-color
, Q3 g0 s% w5 |& K* A" p& Q2 A record-data* `9 L" m" d" B2 H7 q$ ^6 D& ~
]
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) _6 e. G* j. z1 A7 z( Z ;; give the turtles an initial speed4 `. k) ^. T* Z/ B6 ^. X6 A
ask turtles [ set-car-speed ]
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reset-ticks
; F9 D4 G! b+ x& G" |3 fend
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, J4 ]0 Q! U9 q! _2 b$ w- e$ z;; Initialize the global variables to appropriate values
. O y" O" {( }* Ito setup-globals* V6 g: q! h2 K
set current-light nobody ;; just for now, since there are no lights yet
. T7 `0 Z# V+ `2 O2 C+ [ set phase 0
" Q5 w3 v' l* M( Z* B set num-cars-stopped 01 o$ d1 T2 e/ r
set grid-x-inc world-width / grid-size-x, ]1 j3 n/ j6 G
set grid-y-inc world-height / grid-size-y
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% {; [& C, f4 X ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
7 g, k* ?3 z Q" ?$ j+ p; A set acceleration 0.099
. E4 d) s2 O% ^$ V& Jend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,9 C( V) t% X! E
;; and initialize the traffic lights to one setting" D. [5 X2 [$ ?! w- q" E X+ u
to setup-patches
. |, }3 @/ ~% ^. x' z/ S) Z ;; initialize the patch-owned variables and color the patches to a base-color; X# M! k1 G8 u9 |/ _2 A3 Z0 v' S
ask patches" V1 g( F# Z9 e2 M2 Z
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set intersection? false
$ S+ W6 L4 w, j2 H& r set auto? false) T6 r: p4 | }$ }
set green-light-up? true
3 O( B, c0 n' Y% d' l) y' c3 `, n7 k set my-row -1* g8 ?4 r% N. a9 y. y8 a1 t" T
set my-column -1
: o) g- x% `; X- c7 c set my-phase -1
$ w" }. B% D, t0 a- d+ M1 h set pcolor brown + 3
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4 }* _/ u6 c, n* _ ;; initialize the global variables that hold patch agentsets
. Y4 V# O1 w K0 E* Z set roads patches with1 h8 v( B8 U( Q% h
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' y( a' e5 O& r" f* A% p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 G8 Q9 @( w, H K$ W- C set intersections roads with
6 V9 ?, T/ |) Z! y$ W: N [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and" G$ _8 D7 k' D# \( y8 `$ {4 u
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]; K& \ I: x+ S- f, |5 X
3 ~$ ~( g4 X l: v ask roads [ set pcolor white ]+ o: F- D9 P) c' m9 }
setup-intersections! c# B- }7 _0 a7 q6 N& ?
end2 }0 u$ L# x* G4 x# U
其中定义道路的句子,如下所示,是什么意思啊?
* e6 K+ N# v- e7 A+ J2 q set roads patches with1 r4 t1 l9 w% p) l6 `: T; H' m
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# ?/ b+ F2 k: U4 Q7 H" _$ F
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: @1 ~2 T) Y5 D8 `# k" ^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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