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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。
0 G8 d o: L9 vnetlogo自带的social science--traffic grid这一例子当中,+ G* n0 |' q2 o4 t& U! Q0 i' j
globals$ C( u+ T( G/ \* c8 d
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grid-x-inc ;; the amount of patches in between two roads in the x direction
' o. ~! c; C( C& q$ f grid-y-inc ;; the amount of patches in between two roads in the y direction x2 D4 V7 H- R2 @
acceleration ;; the constant that controls how much a car speeds up or slows down by if; D f, @. V* D3 V. Q2 [6 _! L- E( P
;; it is to accelerate or decelerate
9 R) {3 [( @: E4 k# G% Q. g: I phase ;; keeps track of the phase
3 D2 u8 p, H/ _0 ^! ]$ M) m num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
* D4 A2 Q0 _3 F8 A& f; L current-light ;; the currently selected light
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;; patch agentsets" t: c. y% e$ y6 k2 n2 @7 a/ u
intersections ;; agentset containing the patches that are intersections, o! N; M1 {3 z9 \5 ^
roads ;; agentset containing the patches that are roads( M% F* S, V) {' Y7 ?( G3 J
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8 _. U6 W! A% }turtles-own
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) n y& q7 K7 V8 U# \- Q- o speed ;; the speed of the turtle
4 _, v" z$ {/ N9 c up-car? ;; true if the turtle moves downwards and false if it moves to the right
! I8 S% H; A6 J: s wait-time ;; the amount of time since the last time a turtle has moved# S5 k! H Z9 ?9 j! z
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4 l( m1 {# P- D' p fpatches-own: V4 c$ R" J% t, {: k5 d/ s7 r
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intersection? ;; true if the patch is at the intersection of two roads
, b& Y. U! [0 y; c& S+ e; F green-light-up? ;; true if the green light is above the intersection. otherwise, false.0 r$ U) r/ {9 o- D' _7 R+ v
;; false for a non-intersection patches.3 ] U/ z( G# W3 i! P% ~/ O" y8 V
my-row ;; the row of the intersection counting from the upper left corner of the5 m7 B2 f" A/ N+ N( G4 B) n5 g
;; world. -1 for non-intersection patches.
+ [+ U: c! h' Y; x7 K my-column ;; the column of the intersection counting from the upper left corner of the
. ^2 E; T1 T0 L* V3 ^7 @ ;; world. -1 for non-intersection patches.
- }; B" c' I" S% k my-phase ;; the phase for the intersection. -1 for non-intersection patches.; r0 ~9 m1 Q m0 d6 ^6 w
auto? ;; whether or not this intersection will switch automatically.
4 y) l a- h+ ^7 ` ;; false for non-intersection patches.( D" H9 d7 Q- o$ _& |# Z* g' \
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/ q1 m/ R' C7 X' m0 n) E;;;;;;;;;;;;;;;;;;;;;;
6 h, }: c: r( u" K, F5 b! ^;; Setup Procedures ;;4 _+ E0 Z& R" O# `4 C' k4 S
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.1 x2 h" l. @ {$ f/ A
;; Create num-cars of turtles if there are enough road patches for one turtle to" o, Y# q. z7 ?4 j7 \
;; be created per road patch. Set up the plots.% o4 O+ x( v" n* T$ o7 Q
to setup; g7 J# S! W3 E& y3 L
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables9 c$ ]# D8 }7 d/ W4 G& j; {; H
setup-patches
@0 x2 y3 D z/ H6 c make-current one-of intersections
5 R1 T0 }# R, m# Q s! I5 N label-current
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set-default-shape turtles "car"; U- K! a! H* I8 e. J4 d* O
' ]' d @. y: D. k/ s. @7 g if (num-cars > count roads)0 m# G( [3 F$ `: I/ D, Y
[
" n) H+ H1 I) \3 x$ B user-message (word "There are too many cars for the amount of "
) X4 ?% E3 E! a/ B% N "road. Either increase the amount of roads "6 `# \0 Y* ~/ K6 X; T
"by increasing the GRID-SIZE-X or ". _/ b/ [- `+ O9 J
"GRID-SIZE-Y sliders, or decrease the "1 z: v6 j8 h; x, X1 v
"number of cars by lowering the NUMBER slider.\n"# e% G z/ y$ Z8 s4 t) ^; Q3 Q
"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-color0 H1 i9 a) X5 c& [7 x! ]# }* W
crt num-cars5 N( a) \2 X8 }, x! V3 A# V
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# d" X& e$ o! D6 O1 K setup-cars
+ Q* v7 K* z, g. E2 G$ J set-car-color1 ?" b q# s" _/ U
record-data* k6 L* B- z# z& Q$ l2 F
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;; give the turtles an initial speed2 v/ Y4 l( O) s5 p
ask turtles [ set-car-speed ]
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: ] P0 q3 n! g, Y! b reset-ticks. E8 |: U4 s: [, I6 P
end
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;; Initialize the global variables to appropriate values. l1 z% O ^9 c" X2 Z) Z
to setup-globals, a% f5 f n9 w3 g" n% U# e
set current-light nobody ;; just for now, since there are no lights yet
" M4 e2 j. E/ V3 u set phase 0! e! c2 y# T+ b! r6 b x) q8 K2 Z
set num-cars-stopped 0
6 D& W! C7 s/ C, w: D- |6 Y set grid-x-inc world-width / grid-size-x
6 |" {3 U5 y1 o! m- a set grid-y-inc world-height / grid-size-y
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0 d# X8 v' T( K/ t ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
" R0 l! T" V2 \' U/ z9 t \ set acceleration 0.099. m" u7 f/ w T2 r! T
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
) e d9 j4 z4 U; s T, c;; and initialize the traffic lights to one setting
) C4 D. p6 y0 C+ I/ wto setup-patches- K' G% c. a* [6 e9 D" m) z
;; initialize the patch-owned variables and color the patches to a base-color
+ O7 i: y4 u; a2 t% [ ask patches- {4 V* n4 P% n7 @& ]
[
1 ]2 v& \8 \1 V& j+ a set intersection? false
2 O3 L9 g' [7 k) ]8 e: x- h set auto? false
$ y; w. A+ V& |& ? | set green-light-up? true1 ]. R7 ? V/ T0 q4 W
set my-row -1% b! _" E2 `& v3 o% C. M. e1 P
set my-column -1% e8 Q: X3 D) s, Z; O2 ^
set my-phase -1
, @, p n; I0 g% p set pcolor brown + 3
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: L, q8 `4 y5 a# g9 {- q9 s; X0 t0 E# C ;; initialize the global variables that hold patch agentsets
+ ^0 u; l5 v9 C8 w) }% k' F5 b set roads patches with3 h5 @& T2 B( k' \: W9 `
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ W0 U& }3 E7 V6 Y3 Y8 C
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]# r! e& l3 g/ f* b5 P! r
set intersections roads with% M$ w8 h1 c/ z2 v# e
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
1 M3 u3 t' C* K5 O" u (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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3 f% O, S2 h" _9 R2 K ask roads [ set pcolor white ]
/ m* C2 P& O+ G. J' `3 ~) B setup-intersections
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; b/ @- K$ D* z R) f8 _其中定义道路的句子,如下所示,是什么意思啊?
$ [* n1 F0 H5 ?+ I set roads patches with1 M1 d4 V3 c5 x p; w/ G
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( p3 O0 ^- a1 A$ K5 g
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- W* U4 R6 W" i( K- X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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