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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。$ B0 b" j x( R' y$ @: Z
netlogo自带的social science--traffic grid这一例子当中,
) X) V( {) f9 c8 S+ ^& [2 H; dglobals2 l4 A) p, O: o6 u2 s! L5 ]( C3 l
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grid-x-inc ;; the amount of patches in between two roads in the x direction
; L! W; v9 \1 T) m# `$ m grid-y-inc ;; the amount of patches in between two roads in the y direction% n2 ^" h" U1 n* x4 @
acceleration ;; the constant that controls how much a car speeds up or slows down by if
8 ], c/ V( }% H ;; it is to accelerate or decelerate
- W2 _3 d1 I# d. r, @1 y/ }) s* G phase ;; keeps track of the phase) d) x5 D6 n& |/ ?, ?
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure0 r+ O. P! y; z" L' h
current-light ;; the currently selected light
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;; patch agentsets
. K1 Q- U! p7 R( j/ A0 j3 E intersections ;; agentset containing the patches that are intersections
+ r2 B9 H& \) ]5 T# p roads ;; agentset containing the patches that are roads
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turtles-own* a. }! f C* ]( |! m6 }9 D
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speed ;; the speed of the turtle
1 Z6 j- f! w Z7 ]) M3 M up-car? ;; true if the turtle moves downwards and false if it moves to the right
9 w& K' Q& `. a4 a wait-time ;; the amount of time since the last time a turtle has moved7 k: c- p& s) U
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patches-own: r7 R2 y% S7 c6 T7 N3 |0 s* h! w
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intersection? ;; true if the patch is at the intersection of two roads
( Y- u) N# M. ~) h' O" u green-light-up? ;; true if the green light is above the intersection. otherwise, false.# s; [8 m( n6 p& a1 ?
;; false for a non-intersection patches.
" a8 S4 y2 R; ]( k3 O my-row ;; the row of the intersection counting from the upper left corner of the
/ o/ a% C' b2 q {1 ^9 H ;; world. -1 for non-intersection patches.
, e m7 e: v. j! I5 w6 p my-column ;; the column of the intersection counting from the upper left corner of the
! s) y- |; B2 P; P: s7 a ;; world. -1 for non-intersection patches.
2 C! J/ K0 F# R7 [0 q3 j my-phase ;; the phase for the intersection. -1 for non-intersection patches.& @( n& ?/ e5 C5 Z2 q. a b
auto? ;; whether or not this intersection will switch automatically.- I$ ]' f0 i* X" T* H
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;- w! H2 w+ `+ h6 e' `, B5 `
;; Setup Procedures ;;
3 u8 b, E$ `7 @0 v+ k. f; X;;;;;;;;;;;;;;;;;;;;;;" K* B- k. x) L! O6 [9 l6 ]
' Z) O8 g$ N' d# n+ j;; Initialize the display by giving the global and patch variables initial values.
# G. O _( I8 D( }% n;; Create num-cars of turtles if there are enough road patches for one turtle to% T2 |5 ~4 f4 Y9 x& Z; G2 ~2 ~, X7 Z9 k
;; be created per road patch. Set up the plots.
9 s4 Y; u& H( U* T. M1 Vto setup
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; G+ _) K& ~' P2 O' F. z setup-globals5 T, m. `' V+ ?5 |
3 z& q) I$ K! t4 w0 W& n ;; First we ask the patches to draw themselves and set up a few variables! w" j( X2 X/ u6 q/ [
setup-patches( e* j4 K) C% ^2 b7 z7 M
make-current one-of intersections) L& y+ R5 N3 x _, M% f
label-current; f/ |* k P; D/ {6 O/ Z
' ^! Q3 G4 t& E# v1 s$ w! K set-default-shape turtles "car"9 Q$ S: n8 s, K% d$ `) G
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if (num-cars > count roads)/ C# R5 z' {, [' @# J
[
+ h O. ]% |) J user-message (word "There are too many cars for the amount of " A' N: @. Z$ R: Q
"road. Either increase the amount of roads "- M/ D/ x ?! {# s
"by increasing the GRID-SIZE-X or "7 ~. e4 x: \7 F4 S# F% j3 Z/ X6 e3 A
"GRID-SIZE-Y sliders, or decrease the "
3 A0 O6 B, g; h* U3 R, X0 L "number of cars by lowering the NUMBER slider.\n"
' s3 ?" ]7 K8 _& B; v) u "The setup has stopped.")
/ H; d: t$ }6 z stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
% s. X( Z: n3 f* p4 g T& u crt num-cars
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setup-cars4 ], m7 _" ^9 G: V" C# K
set-car-color
7 [% l& U& g4 P/ k record-data X1 l% W/ O! s1 o
]
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;; give the turtles an initial speed4 h, S Y8 X, `' w3 T# r5 [
ask turtles [ set-car-speed ]+ P5 A4 t8 H* I, a- k4 x g
8 _; ^2 N M6 S* u0 [1 V7 r1 A reset-ticks
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/ L1 Q4 p3 @3 Q1 v3 D1 e$ v1 b c;; Initialize the global variables to appropriate values
) p) {" V. k1 `2 m2 H3 @: R9 e Oto setup-globals
% O: T- Z4 `0 {% i" K" Q set current-light nobody ;; just for now, since there are no lights yet: j f) p! v y* w y( I3 s
set phase 0
7 e7 s8 r" g* q- t% L set num-cars-stopped 0
5 V8 f9 @. b6 w& b; L2 I, |+ F2 E7 o set grid-x-inc world-width / grid-size-x
! Y/ U" k* O' A; O set grid-y-inc world-height / grid-size-y: ~+ e/ S- U) P8 m4 ^% G: c
6 \7 n* m* B! q% M/ u ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
; \9 D* z$ E$ I! T set acceleration 0.099& b; y8 d2 M4 A8 p. N2 g( _/ r3 E
end* q" h1 u! r/ F g2 s
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
# C7 U7 P; O: O( J. [ @;; and initialize the traffic lights to one setting
1 Q/ ~, L9 J$ d0 f7 T0 uto setup-patches
& N# k% @4 i. t# @" F' w ;; initialize the patch-owned variables and color the patches to a base-color
2 q" o8 c3 c$ f$ v/ U" Y+ A ask patches
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8 ^1 S7 g \" g3 A W. a set intersection? false
6 a7 X; a" g) F2 b7 w set auto? false! l7 K8 |7 P5 n* `" S
set green-light-up? true5 W' I9 {5 R% C4 z5 H' V
set my-row -1
5 t. j4 |0 N! H! u set my-column -1
% Q% @: T* P# X5 s set my-phase -1. R2 s6 w5 o/ b" Z9 N6 T: y. Z
set pcolor brown + 3
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* ]$ v# C. g8 d/ X4 G4 K& I0 o ;; initialize the global variables that hold patch agentsets; B( ^& E ^, I$ h8 F: M1 o
set roads patches with
3 p+ `1 B/ P) O1 F+ m [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" z2 S" o4 U' W0 F1 N& _ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- ~6 C4 E6 a$ ?
set intersections roads with9 U2 k$ b2 H- r7 s8 j+ K* f
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
3 w8 D- }- K0 t2 j& o (floor((pycor + max-pycor) mod grid-y-inc) = 0)], N9 Y- W, `) a r! U
9 J- K3 p7 ^& ~& x0 q: h7 | ask roads [ set pcolor white ]
( k$ u+ O7 G0 K( F* [9 a. D5 S setup-intersections
: ^8 S/ U9 s( r+ P2 c% l; mend
R7 D! Q5 o9 ?5 M( r( R1 B" r其中定义道路的句子,如下所示,是什么意思啊?4 w8 Q) w; v' k
set roads patches with
5 k$ G, y9 @$ V7 V [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
y9 Q8 s: h! J& [ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: R4 A# e6 U/ M8 t$ N
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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