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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。
+ t \: A: z0 s& p6 t/ ~# t, Inetlogo自带的social science--traffic grid这一例子当中,% z/ g+ ~3 U# C& n1 |" j& a2 a
globals
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: R! ]. y0 `2 m F grid-x-inc ;; the amount of patches in between two roads in the x direction9 g, l9 G9 J" m
grid-y-inc ;; the amount of patches in between two roads in the y direction5 p0 J) I- {+ c% P( v6 y9 v) @
acceleration ;; the constant that controls how much a car speeds up or slows down by if
" Q) I7 S8 m4 l6 C; r ;; it is to accelerate or decelerate
# N3 u* U4 d; a. j7 i phase ;; keeps track of the phase" x! B* m p# A: `( g
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
$ p( ^& p3 H7 x! o0 k) [5 F current-light ;; the currently selected light
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2 H! W, @* R$ N: C0 J" O ;; patch agentsets* f. A3 b" u4 x/ q
intersections ;; agentset containing the patches that are intersections$ z/ N7 q0 H8 r3 X0 J
roads ;; agentset containing the patches that are roads
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" G! j' q: ~, jturtles-own: S2 S7 p$ D1 n! n3 J9 r1 ^$ N
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speed ;; the speed of the turtle
& H- }0 e* e2 n7 D! }0 y8 o/ e up-car? ;; true if the turtle moves downwards and false if it moves to the right9 _% G! [4 N5 C! ^
wait-time ;; the amount of time since the last time a turtle has moved& R! r: A* r: z0 Z" i4 M! }
]
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; p5 F$ v3 r9 r1 F! r! wpatches-own
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* c. Z9 S0 f0 h, |$ a intersection? ;; true if the patch is at the intersection of two roads6 X2 [$ L2 N1 ~' x! g
green-light-up? ;; true if the green light is above the intersection. otherwise, false.' {# r6 O# |* }% u% e6 {% z
;; false for a non-intersection patches.
# i* M1 h, Y& |, E& g. ~' a4 O( Z* d my-row ;; the row of the intersection counting from the upper left corner of the
9 S- k1 W, ?! j- z ;; world. -1 for non-intersection patches., i: z" B) I: U. t4 P$ h4 l8 r" ~
my-column ;; the column of the intersection counting from the upper left corner of the7 \! i1 J& S% H0 o6 c
;; world. -1 for non-intersection patches.0 Y1 c) t# E% e# X% ?
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
- }( D7 Q; r! S2 ^ auto? ;; whether or not this intersection will switch automatically.: O7 o6 @0 ?' X$ m) q! s
;; false for non-intersection patches. h! N, c7 M2 D( P8 x x+ l
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5 i% @1 J: h7 C+ n: F;;;;;;;;;;;;;;;;;;;;;;+ R- \9 p/ F. Q
;; Setup Procedures ;;" f7 X+ v. V4 p/ P' X$ f
;;;;;;;;;;;;;;;;;;;;;;
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/ r% p+ o4 t2 _& ~/ ^) ^;; Initialize the display by giving the global and patch variables initial values.$ f1 h5 ]; N h& ^" S0 C
;; Create num-cars of turtles if there are enough road patches for one turtle to% j+ \( u! h7 A( o
;; be created per road patch. Set up the plots.% D0 d3 G2 w% a; V' l! `
to setup
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setup-globals/ e8 n6 I$ M/ z) c" [$ N' [
. _! n B/ N, c* U7 Q7 l5 n ;; First we ask the patches to draw themselves and set up a few variables
6 x0 A, K: ` u6 {( F setup-patches, Z& z0 X T1 L- L: E0 c* }
make-current one-of intersections Y ]. F/ t& Z \, }+ R
label-current, D5 u5 P. @. ~* U6 c: v
2 u% D7 [4 B' w set-default-shape turtles "car"
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4 V b. G4 f$ U, h& p if (num-cars > count roads): _3 d& _6 i/ b. ]# f, B& Q* G
[
% ~$ V$ y0 y# O6 U user-message (word "There are too many cars for the amount of ", y8 o7 A+ {* P8 P8 J
"road. Either increase the amount of roads "2 s' n2 m/ ]6 Y) I4 D3 h$ n
"by increasing the GRID-SIZE-X or "4 e( e4 t+ ~: O3 Y: y1 x
"GRID-SIZE-Y sliders, or decrease the "
_1 t4 m' b& }' [5 A "number of cars by lowering the NUMBER slider.\n"7 e- H5 b# U2 R$ h: k
"The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
k' \4 ~' H! O- m/ d4 L crt num-cars# f3 {! A% c9 Z1 }5 ]/ G
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setup-cars: h" _% U( x5 S7 T
set-car-color
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;; give the turtles an initial speed
! Q+ C" ~ F( {6 y4 c& @- c ask turtles [ set-car-speed ]6 D# _, M0 s6 \1 ?9 h( t# B% y
# F) { S- l- r9 M9 R reset-ticks* n2 D6 M. `& j: S' J# U9 ]8 [' l* D
end' ^3 p1 l4 ?" l/ o2 Q
0 P, q+ p: U* H" k;; Initialize the global variables to appropriate values f; ^2 I% C+ t% b( r" [# r
to setup-globals7 h1 o6 W8 J% H
set current-light nobody ;; just for now, since there are no lights yet
; d/ Q' u& H( l4 a set phase 0
! \' ?4 |: F8 ~% v% I7 r6 o) B8 ? set num-cars-stopped 0
8 o* ~3 I" ?2 i& v+ L N set grid-x-inc world-width / grid-size-x
7 L5 J; V! ] H/ i3 Q set grid-y-inc world-height / grid-size-y( a$ a j/ l2 w6 Y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary0 j D0 }) c# \4 x
set acceleration 0.099
6 W( \6 E( c! S+ s1 {; y4 Oend
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* o& }; v- F _' g1 p: _+ I;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
7 M4 v5 d1 Q8 D. o$ d) H% c;; and initialize the traffic lights to one setting
1 v+ |6 W, D, I( [0 F, c* @to setup-patches
8 w' t; m8 r1 h ;; initialize the patch-owned variables and color the patches to a base-color8 \$ u+ c# n" d! S" H7 v7 i: d
ask patches
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set intersection? false) d' d" t* E8 H/ o2 L5 P# ?
set auto? false' ]/ u5 X4 J y) L. d
set green-light-up? true
- C/ c; C4 |5 J- }" M" Z set my-row -1
, K0 F5 G" _1 i1 \/ ~3 ` set my-column -1" n% K: Z3 d3 D: ~- G! I, H
set my-phase -1% {+ ?+ _8 T6 D5 F# u* ^. c
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
' U7 H, r' b' T) q0 Y set roads patches with# L9 z, V% Z0 R8 X* F
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 f4 j: B. k# ?/ y. I9 `
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. q5 I. c0 W5 R* r, h( \1 P set intersections roads with+ e, |- A- \9 b* \2 N% }5 |' [
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
4 s% B8 q! h' {/ E (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* i' [4 a4 K) [5 E4 e# Y5 Z
$ m0 ]8 b( ?0 i ask roads [ set pcolor white ]4 J1 P0 C1 ^ y) K. J
setup-intersections
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& s0 q8 e$ k9 q. Q; O5 _8 H其中定义道路的句子,如下所示,是什么意思啊?+ N9 l$ ]: w, H# K& X/ t& @
set roads patches with
# k8 E) O' M# n; H$ z: n [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* _9 ]: |- b- @5 { H* v (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 j9 a$ C, h- Q7 t( V& 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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