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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。
9 G; U5 f0 j1 m$ ynetlogo自带的social science--traffic grid这一例子当中,+ f. R) l. }/ H) F, z
globals) U$ |( ~' o: n" D2 p- p
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- ~1 Y1 E% t4 B; r ~% r grid-x-inc ;; the amount of patches in between two roads in the x direction2 I! m. V# S) m5 w# E% e
grid-y-inc ;; the amount of patches in between two roads in the y direction% R0 l, F, T3 ^+ Z
acceleration ;; the constant that controls how much a car speeds up or slows down by if8 z9 p' V5 w% I2 G9 p! U3 l
;; it is to accelerate or decelerate
X* g/ u1 K) ?0 P3 } phase ;; keeps track of the phase
, f& S3 q$ m6 h' e" T num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
1 Y# M: v4 n) J# h& p$ v) k current-light ;; the currently selected light
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, _3 l3 b& p0 O' h1 Z ;; patch agentsets- G! D. V- ^$ p5 s. S: |, N
intersections ;; agentset containing the patches that are intersections
. V0 i1 t3 d) M) M5 y roads ;; agentset containing the patches that are roads# G# F: w$ g0 q( k/ b
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4 e/ c/ M t$ t* @9 l# ]turtles-own4 v$ n/ z( g" F* |( Y* A0 }! N
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speed ;; the speed of the turtle8 t3 G" q6 V [( I/ G8 m
up-car? ;; true if the turtle moves downwards and false if it moves to the right- |9 }5 M7 P' k; b: Z* h
wait-time ;; the amount of time since the last time a turtle has moved! j& c4 T+ r1 W; ^2 P
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2 Y3 S8 F5 f- V: L9 U$ ]* L3 X$ apatches-own) V; ?# G$ f( j/ o# A5 q! \
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intersection? ;; true if the patch is at the intersection of two roads/ c' w2 X# y4 _" B2 m
green-light-up? ;; true if the green light is above the intersection. otherwise, false.% m0 u) Y3 H# D. [2 Z
;; false for a non-intersection patches.
, }: c; t' [* r7 M( z my-row ;; the row of the intersection counting from the upper left corner of the8 Q N; o8 P" L0 h( v
;; world. -1 for non-intersection patches.
$ w. o( g& a" }. A' N a my-column ;; the column of the intersection counting from the upper left corner of the; M! W) {( T9 E( @0 o3 e' u1 Q! F5 l
;; world. -1 for non-intersection patches.% R1 p e' T4 @9 E
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
0 b- Q3 `; M! Y2 _! f% _! T auto? ;; whether or not this intersection will switch automatically.
* ^) Y5 R9 h9 q4 ^( U ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;. }) z4 j6 _( U. B! ]0 j
;; Setup Procedures ;;8 F( d9 q$ o& U* Z) \; I8 t! n
;;;;;;;;;;;;;;;;;;;;;;0 K0 t4 i: E: S+ K. L+ v# ~; {0 v! b
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;; Initialize the display by giving the global and patch variables initial values.
1 }5 s( A4 ?4 _9 ]! a% Z;; Create num-cars of turtles if there are enough road patches for one turtle to0 q* N6 P- ^2 B* _, Q1 X* E
;; be created per road patch. Set up the plots.
) [: i' Z" `, p9 k* x9 @to setup) @+ G* ?9 q0 Q1 C
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setup-globals8 b- K( Q7 f, G% c
; {4 S, n O, ~ ;; First we ask the patches to draw themselves and set up a few variables/ [. W* X, [" Z j
setup-patches
: O/ w1 U3 k% k. M make-current one-of intersections, C) G3 V/ u% A5 M g- f
label-current9 j4 M, a' R. r6 m
$ F: G+ D/ C$ i8 n& A) m: q set-default-shape turtles "car"
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. m+ A: j# e# X# @7 P2 f if (num-cars > count roads)
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3 ]1 w7 v0 v5 v. h user-message (word "There are too many cars for the amount of "
i' c' Y1 c I! J" l( b+ F2 B& F) A "road. Either increase the amount of roads "
' ~6 K3 J p( A, p* T "by increasing the GRID-SIZE-X or "
' E3 f: ?" y7 S "GRID-SIZE-Y sliders, or decrease the "5 M# b4 g" l. e0 }7 s: [
"number of cars by lowering the NUMBER slider.\n"
/ Y/ i7 B( E$ y: @1 h "The setup has stopped.")
7 {+ Z8 U- T7 ^* W4 K stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color7 f4 z0 u/ W/ v
crt num-cars+ U; [' s2 ?7 ^! G/ ^1 k
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^: J! q, ]+ L5 ?8 ?4 W setup-cars
# B# u; J3 H3 t9 B f3 W& Z8 O set-car-color/ i( i7 y( M3 o9 E
record-data
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;; give the turtles an initial speed# [3 ?6 \, J* }
ask turtles [ set-car-speed ]
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) Q! [2 l8 {0 Y& ] reset-ticks3 l) j8 W& J% u
end
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! N# k6 F1 F& E;; Initialize the global variables to appropriate values
- H- {7 | b6 ^" ]2 v* A+ Bto setup-globals1 \) Z" g1 _* h" ]
set current-light nobody ;; just for now, since there are no lights yet( Y& h# ~; g6 c( E
set phase 0
" s6 P- O3 x# \$ M set num-cars-stopped 0* ?8 L+ O1 h# i' l
set grid-x-inc world-width / grid-size-x3 T0 I( N& v) C4 q( s2 w6 j2 _
set grid-y-inc world-height / grid-size-y! f. m# ?8 ~' K. c
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
1 J+ ]2 e3 W0 R9 G set acceleration 0.099
2 b, B% @ O: \! H5 {end
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+ ]3 g( ^2 S9 w) J9 A) h;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. O, E! V0 B8 a4 ~# K;; and initialize the traffic lights to one setting' c# Z# \2 H, U; J5 ] O
to setup-patches
$ @, @ y( Z: K; e8 M+ W, [ ;; initialize the patch-owned variables and color the patches to a base-color
8 D. V& N) w2 |* k ask patches: ~9 _4 K% Q2 w7 G
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set intersection? false% t0 A# i& p b; Z2 M- R3 D
set auto? false0 H- o) ~$ O2 x( \- _( L5 R# x
set green-light-up? true
+ h9 p% o; U- W- @ set my-row -1, ?" [ {- C+ ~4 z) z# W& N
set my-column -1
: M( R- j' Y6 F& ?, R5 ^0 t- Q* [ set my-phase -1
! C3 G# f/ a! @6 a0 i+ e9 c set pcolor brown + 3( n' K/ `0 d' g9 c4 N
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. t) U$ f3 ^1 Q* u ;; initialize the global variables that hold patch agentsets
% R0 _; M ]. o" Y# E set roads patches with
6 Y8 X9 R' W9 \& O4 Y9 Q2 w* I9 u [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 Z, Y0 {1 H- ?. P! p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
( H; `" ^' K8 e0 U# w set intersections roads with
1 b! L0 ?8 R( t1 B- o6 b& F/ W4 o [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' x, b' \+ x& v' Q (floor((pycor + max-pycor) mod grid-y-inc) = 0)], U. I0 K! L3 N, a/ t$ A
1 {7 V8 \. p' u' a! L) E* U ask roads [ set pcolor white ]
( ~0 P$ b: ~0 ^; Z0 t/ j setup-intersections% }8 l" Z# W; g
end# m3 i5 e: J5 R H( D5 ]0 ~
其中定义道路的句子,如下所示,是什么意思啊?
. y, k. P+ Y& L( D0 Y- w. }0 n set roads patches with
5 V+ E, {% L7 s! R/ v [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 x$ S2 q$ }& [
(floor((pycor + max-pycor) mod grid-y-inc) = 0)], ~* s9 m0 i {0 m: q2 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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