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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。- n6 q, J5 F6 x) e) F1 K
netlogo自带的social science--traffic grid这一例子当中,; K& P3 Q7 L% j' d) F8 x
globals6 V) m8 g/ ?7 n# R
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grid-x-inc ;; the amount of patches in between two roads in the x direction
; x2 ]% x9 T9 s2 T( m; y grid-y-inc ;; the amount of patches in between two roads in the y direction; h% C+ p* R! g8 F
acceleration ;; the constant that controls how much a car speeds up or slows down by if& h- a. R% u6 W; k. e* R& _1 @5 r
;; it is to accelerate or decelerate
/ C; k7 T1 w3 T: ]6 [$ W0 Y2 ?9 b% j$ } phase ;; keeps track of the phase
- ~% Y8 c6 W" l/ Y" D# } num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
- s, `/ Z1 n! a7 k) Y current-light ;; the currently selected light" z j. e& G. e- U! B8 b
) Z: Z7 r% ?# P! _% B ;; patch agentsets' Y3 k0 g/ n0 S4 Z( r% _1 T
intersections ;; agentset containing the patches that are intersections) x2 \9 }! I5 `$ [4 a
roads ;; agentset containing the patches that are roads; Z' T1 {: _+ u5 i
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turtles-own
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' c& c& e% a: |: U: L* X) U2 L# G speed ;; the speed of the turtle, ?' v: |8 |3 d( H, {5 i) b
up-car? ;; true if the turtle moves downwards and false if it moves to the right- J! \8 ^0 P5 v# n! Q
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own9 K% S Y; m8 Q4 B9 o
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) q4 h, `/ x& V' [ intersection? ;; true if the patch is at the intersection of two roads
0 ~9 l# @ d; o$ x+ ^ green-light-up? ;; true if the green light is above the intersection. otherwise, false.
* z* H2 {5 K o+ ^ ;; false for a non-intersection patches.1 d/ |$ B! p9 S d/ }
my-row ;; the row of the intersection counting from the upper left corner of the1 {5 v8 _, o5 v! e& m+ i# E
;; world. -1 for non-intersection patches.- }' T) U, u% g# h: D
my-column ;; the column of the intersection counting from the upper left corner of the
7 X* d3 }0 U2 b }) g! P( I2 t ;; world. -1 for non-intersection patches.' m1 Y' \% W- L% f# J. p2 M
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
) W2 o+ I3 a3 L) {- B. C% _) I auto? ;; whether or not this intersection will switch automatically.
: |% G* |/ k4 t& i4 C- F* ? ;; false for non-intersection patches.3 h! c2 {1 \" j' o @1 k+ @4 a
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;;;;;;;;;;;;;;;;;;;;;;
/ T# @+ G& ]) J5 Y+ Q: H;; Setup Procedures ;;& {% P& [, D5 d3 _( `: R9 e
;;;;;;;;;;;;;;;;;;;;;;
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2 _- H' h/ c) |' D;; Initialize the display by giving the global and patch variables initial values.
' K" ]) {3 Z# o) w6 \7 Z;; Create num-cars of turtles if there are enough road patches for one turtle to/ _. l! S( O8 I
;; be created per road patch. Set up the plots. W& F+ B7 i3 ^& R6 P3 G
to setup/ c5 K6 I: G* Z# P/ x
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setup-globals+ A! ~( q& A7 B: @* O; V: c
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;; First we ask the patches to draw themselves and set up a few variables
% H- A% F: \$ ?+ }: K1 @( {% l setup-patches! s$ b% X0 _+ G. P# W$ C9 y9 b2 \
make-current one-of intersections' y c4 j2 [# p3 }$ i$ _
label-current7 K3 @2 f+ N3 K
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set-default-shape turtles "car"" `0 X4 ], Q) }
, s% a8 z: [" o. R( D* V if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of ", Z" L% w7 o4 I. U3 s
"road. Either increase the amount of roads "& \+ d/ e$ X/ o+ ]2 ^# Z
"by increasing the GRID-SIZE-X or "
2 V* R/ J* e/ i4 j7 {& c "GRID-SIZE-Y sliders, or decrease the "
# t( P$ A' \& ]# O* z4 _4 M "number of cars by lowering the NUMBER slider.\n"
8 n$ Z; @* s$ o& G5 b "The setup has stopped.")2 X8 J9 S* T9 d9 s3 } w* D6 K7 C
stop/ c a1 v4 [+ w5 e( c; k% z) [- b
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3 _0 ^. Q2 B; d9 { ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color# H+ i& C8 X' j- r& T
crt num-cars8 S. j0 q& k1 j0 V
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setup-cars3 m% B1 w% r+ `9 |& [
set-car-color
6 _9 g/ `! m' O# p0 D5 C) i record-data
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6 y/ _" V3 G5 S, ?0 e' g ;; give the turtles an initial speed. L8 y& M% \' d, m% V% v
ask turtles [ set-car-speed ]1 W. F" a4 V9 { Y
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reset-ticks
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' ~7 b$ E1 F F' g C;; Initialize the global variables to appropriate values9 Q _- k) E+ Z; x- `
to setup-globals4 L6 I) |( V8 _8 m
set current-light nobody ;; just for now, since there are no lights yet
: ^! r/ L: h$ ?: @" J set phase 06 q) E# i3 I8 d/ W: f8 A
set num-cars-stopped 01 M* n. l7 Z0 }6 I8 \
set grid-x-inc world-width / grid-size-x
- z; A- F$ ~- k) ?6 B. C" a A set grid-y-inc world-height / grid-size-y
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( F* H2 M o* M& k" e9 n# L ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary, _6 @ B; H& a$ _1 [6 C1 ~& M
set acceleration 0.0995 w' K. E& D) [4 o9 `) A
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,5 O, M9 v6 Z# q3 b
;; and initialize the traffic lights to one setting% o: v, i% E7 u/ B C% _
to setup-patches
+ M E- e1 _3 X ;; initialize the patch-owned variables and color the patches to a base-color$ h+ ^# E- T, q" ^1 b4 x
ask patches9 t, N9 q! _7 _7 Z
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3 P: j/ _6 r; N8 K. l: L, w0 f3 Q: z* k set intersection? false- P) T, F' n$ n# W; ^# E
set auto? false( ]- i$ o: C) N# a# P$ y8 D* k" k
set green-light-up? true! L9 Y0 G" |6 j6 B' |! e
set my-row -1
- j, x1 x( z6 b set my-column -1
* k7 ?" s7 ~0 j set my-phase -1) W* Y9 A; R; p4 T9 w5 u7 v, i
set pcolor brown + 3
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* b0 z* z$ O, z+ K; d( Z ;; initialize the global variables that hold patch agentsets/ h' |4 c- T- k
set roads patches with& G, j2 T L6 i- Z. i: R
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ K0 f1 [5 a' u9 O
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 z, Y& f& ^9 V
set intersections roads with
5 M$ a. | A) v$ i G4 G [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
: H8 [. L% r! ?$ L (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 p- h7 ]* J1 X ?% R
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ask roads [ set pcolor white ]4 {5 l, m+ k' M+ X K% V' ]* L/ L+ K5 o! Z
setup-intersections3 H7 g" z+ s/ G- w$ |
end
, W% z1 l* G l其中定义道路的句子,如下所示,是什么意思啊?! f% E" d- w+ C! X; a5 y
set roads patches with
7 y6 m/ D- P2 l! O& N9 E [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 X2 v. F# l9 C6 N% B3 H" e
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 |- H1 X/ l5 d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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