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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。) m& l. `5 d& b- r g* a6 ^
netlogo自带的social science--traffic grid这一例子当中,
1 r% [, ]! U; Y; h! Tglobals
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0 d+ L/ w7 v* K; z( S grid-x-inc ;; the amount of patches in between two roads in the x direction
, y: m3 C# U4 w6 L, X grid-y-inc ;; the amount of patches in between two roads in the y direction
G U) F, Y+ L9 z acceleration ;; the constant that controls how much a car speeds up or slows down by if3 X3 O6 q8 X4 H# L
;; it is to accelerate or decelerate1 ^% m: Q6 f* m! r+ W5 c
phase ;; keeps track of the phase
3 @* T( {. E" T- I, q* J) Y1 y# H num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
) h) @6 k1 B# z5 I7 n5 _/ m current-light ;; the currently selected light# g9 c( O, l9 U2 B0 T- q# i
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;; patch agentsets
& L( N( V4 ~3 w1 i; r2 t1 r intersections ;; agentset containing the patches that are intersections
3 J% [8 |( f3 s$ A1 y( r roads ;; agentset containing the patches that are roads
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turtles-own' E* s0 `" |, n6 z* ~0 i- k/ g
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! p0 w% M1 g: B4 _- s4 y+ i9 |" _ speed ;; the speed of the turtle
$ G: }2 p, E$ Z" K* k0 e2 V up-car? ;; true if the turtle moves downwards and false if it moves to the right
1 q2 n4 A' @7 n; n wait-time ;; the amount of time since the last time a turtle has moved6 \' p# S1 K, ?* }! X' R, v$ E
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads" o& O: s5 w1 Y6 `, R
green-light-up? ;; true if the green light is above the intersection. otherwise, false.1 k* l8 H$ `" B: U9 E+ a
;; false for a non-intersection patches.8 s# b7 _4 b( X! N8 m+ J
my-row ;; the row of the intersection counting from the upper left corner of the
3 ?8 z# w' ]+ d$ z ;; world. -1 for non-intersection patches.
8 X1 m- S! t; u% n, j/ i* ` my-column ;; the column of the intersection counting from the upper left corner of the
( a( `9 `& {5 U% F5 [6 _; j9 r( `& s ;; world. -1 for non-intersection patches.
: L$ C9 k% N8 H* z/ X! l8 y6 ? my-phase ;; the phase for the intersection. -1 for non-intersection patches.$ @# s8 V$ g3 k6 [% l7 ~' C* n" |0 O6 |
auto? ;; whether or not this intersection will switch automatically.
1 q) |; _, ?" V- B! J$ z' F ;; false for non-intersection patches.7 C* j* }% M/ n- }* v, R* l
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# d n/ B1 T: M+ j) w" P;;;;;;;;;;;;;;;;;;;;;;
7 m" v2 `7 Y1 B+ N;; Setup Procedures ;;; p8 ^# E; |# w! v/ W& N
;;;;;;;;;;;;;;;;;;;;;;' a. l9 ?: k2 H a2 @) r5 j: a
9 @+ m; {5 t1 a3 ~2 T) t;; Initialize the display by giving the global and patch variables initial values.5 ^ t' e8 U- _* f% b4 w7 y2 ~
;; Create num-cars of turtles if there are enough road patches for one turtle to J+ w; Q3 {" v, H0 Z" q3 t& Z
;; be created per road patch. Set up the plots.% Y9 p" b! F# t1 v8 M4 x
to setup
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* W3 z# c2 |# d) q setup-globals
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2 H8 T- B; O6 U) U- H# k9 j ;; First we ask the patches to draw themselves and set up a few variables& E# e5 P# n1 S- K4 A. G
setup-patches* |- Y& M3 [6 d7 c* a6 i
make-current one-of intersections
7 Z8 M* \$ {* j# t3 f+ \ label-current) U6 \1 B, E* |& q, ?& \' U/ S
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set-default-shape turtles "car"" O% \$ `& `- y) [# S
4 e) p1 E8 w' p9 I0 o4 _' l+ R' r: p9 ^+ \ if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "/ c. P! }" \0 l- t! ^
"road. Either increase the amount of roads "
* O: g& [8 Z( ^* i" g( U$ ?+ { "by increasing the GRID-SIZE-X or "
$ Y3 u+ U* w/ h "GRID-SIZE-Y sliders, or decrease the "
8 }6 \: V8 a$ d7 O" o z; `; v "number of cars by lowering the NUMBER slider.\n"6 Y& S, T3 r+ \1 N* ]6 A, Z
"The setup has stopped.")
! o1 v: u- t! N; u" s stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
, ^( o% M$ s8 O% b3 k( d/ u crt num-cars. A# j: v% r: c: \
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setup-cars
- n9 x/ b5 i" A/ \' s; r7 D set-car-color
7 o9 A1 G8 M: s# a record-data- |' m) G9 j0 n- W/ {2 z" h
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;; give the turtles an initial speed3 m% R' h$ y/ U7 X" r( ~$ ~, @; B
ask turtles [ set-car-speed ]8 P% v: z) ~( n6 P! E
: [2 o& s9 N$ i& ? reset-ticks) }7 ~3 J4 U* D$ v, W3 Y- _% C
end: x' V1 J5 J1 s3 x- z% f2 B
7 Z f( O* q! Q% d" t;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
, S' H+ u6 y/ s: w. b y* U set phase 0* P6 k4 |* J9 c: V: ?9 k
set num-cars-stopped 0
( E* _# C- J( F, x) x7 o" W5 e set grid-x-inc world-width / grid-size-x. \ ` z! Z7 ]! L$ u
set grid-y-inc world-height / grid-size-y
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# v+ I7 Z5 O! ]' k3 a+ L; B# o ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary* T5 A9 U( m+ z- d/ Q' R! n5 O
set acceleration 0.099+ n/ O0 U9 _+ s1 w" N
end% H l5 R5 l+ \0 U# p
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,) g8 n: g8 I$ }3 Y' M
;; and initialize the traffic lights to one setting
$ f# [. w& V, x+ F A/ c2 Kto setup-patches
: x0 d/ [% n( e0 k) y! I: ]& W ;; initialize the patch-owned variables and color the patches to a base-color+ F, D3 h3 D+ [$ j5 I( X
ask patches Q) S; B3 Q3 U, A+ I
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S0 S. y; d( ^! b0 ? set intersection? false
: n: ^& e+ o1 x' Y set auto? false
& l/ F/ M, }4 _+ ^ set green-light-up? true2 H6 y4 g8 x# ^: w. K/ O! F8 I# _% K" b5 P
set my-row -12 ]2 x- U3 E( y2 S7 e6 B; W
set my-column -1
4 P" p% `6 D. O, z; x+ j set my-phase -1
8 J3 U0 e. `: l" Z% U: ^3 x4 P set pcolor brown + 3
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7 l9 J2 d, f! i1 c7 t ;; initialize the global variables that hold patch agentsets; v% a# d, `4 P$ r# v
set roads patches with0 [( q7 J/ C! y7 H: O! M7 u
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) H( Z' L. @* {- o) p _
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ o% H5 {- L2 F5 ~
set intersections roads with
/ e( p, ]* i% w& r6 l+ E$ x [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
7 l. s3 [% O- j8 F% T* s (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! f3 }9 @; M( g3 {- N! d) w q
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ask roads [ set pcolor white ]
/ j1 S6 ^$ x2 ]/ U1 |/ b/ ?' M setup-intersections8 r2 t, }0 h$ }$ m3 [8 v
end
9 J. Y0 {7 s' {; ^/ i" c其中定义道路的句子,如下所示,是什么意思啊?
+ x+ N+ z7 y- H8 m8 }5 H/ C set roads patches with5 M- X/ x) J- F/ i% a6 s+ `
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ [1 {7 x: }1 e3 D7 h+ `
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; b# a5 V; _, p6 H% y' O) P+ _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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