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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。
+ r2 U' i3 c1 e& N1 b/ w' |netlogo自带的social science--traffic grid这一例子当中," i/ x; `2 h, ?! [8 ?2 t
globals( w, X( E% v& ]
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grid-x-inc ;; the amount of patches in between two roads in the x direction( Z3 R, l. ~1 B' g1 K9 g( W
grid-y-inc ;; the amount of patches in between two roads in the y direction
5 y& l3 s# ]' n, F acceleration ;; the constant that controls how much a car speeds up or slows down by if3 @% j7 R5 N: K/ E; n! G5 e7 k z2 B
;; it is to accelerate or decelerate: G% m, z; n% [. ]
phase ;; keeps track of the phase5 q. O* ?5 v) c) Y4 ]0 P" z
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure( ^4 H. I4 j- C
current-light ;; the currently selected light
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( [% b9 F* X! \. g- ]- j ;; patch agentsets
6 d& B" B$ @2 a- V* [ B- q intersections ;; agentset containing the patches that are intersections
6 X Y- I/ Y+ d roads ;; agentset containing the patches that are roads( G& j$ b; z1 t# E4 y
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3 R3 C; c- P: p6 P+ D: Wturtles-own
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3 b5 y3 P+ q3 x! k: a speed ;; the speed of the turtle
( D8 p( e' T5 w& I" P up-car? ;; true if the turtle moves downwards and false if it moves to the right
/ ?& b7 ^- C0 k. [+ d5 U8 i u0 h* { wait-time ;; the amount of time since the last time a turtle has moved5 Z' g0 d1 G0 w+ `$ F
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads, G5 N* X j8 @! P( }
green-light-up? ;; true if the green light is above the intersection. otherwise, false.2 |6 U2 P0 o }% n9 G8 g8 r
;; false for a non-intersection patches.
9 r4 s Y* w" {6 g my-row ;; the row of the intersection counting from the upper left corner of the, ]2 C1 g3 \7 `1 x. p7 s4 k
;; world. -1 for non-intersection patches.) }/ a% ^6 c; t$ D0 w0 _
my-column ;; the column of the intersection counting from the upper left corner of the
7 T5 R: [* I0 @ ;; world. -1 for non-intersection patches.7 m, q) |5 O5 C9 d7 s7 v% t( u
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
6 `+ V R2 T* [4 o auto? ;; whether or not this intersection will switch automatically." B6 @0 t* I$ _2 c; z7 p
;; false for non-intersection patches.8 |/ K/ z% r$ D5 U- Z L0 g& R3 t
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. k3 s# b. y/ |;;;;;;;;;;;;;;;;;;;;;;, K' d U! R% l. P* L& C3 K
;; Setup Procedures ;;; ]) W- ^$ u& m* }7 j# l9 C* e
;;;;;;;;;;;;;;;;;;;;;;% |1 E1 }0 l7 s
/ V) s) N) K9 J2 h) X+ m: i;; Initialize the display by giving the global and patch variables initial values.+ U) m/ C" _. B6 z; l
;; Create num-cars of turtles if there are enough road patches for one turtle to0 F' y, c" L0 I* P9 d* E4 }; ?1 t
;; be created per road patch. Set up the plots.
$ [: M. E8 X" C: _: `0 Rto setup8 M+ E9 Z' ?: z4 d9 Y. \
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setup-globals9 S& r2 f0 s. V. D+ z' M& s
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;; First we ask the patches to draw themselves and set up a few variables/ | e2 U/ o% p, P7 V! Y
setup-patches. \& W2 g6 d5 O! z! ~* _- v) l
make-current one-of intersections
/ \# z( b$ O( J l, X, H0 D7 [ label-current4 {, D6 W8 u" h' m' P- s# B
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set-default-shape turtles "car"6 r3 u4 I% S8 V" z
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if (num-cars > count roads)7 \! N* Y% @5 \% e* ^
[$ v; [4 e& ]/ {
user-message (word "There are too many cars for the amount of ": ^, V* n6 C0 }! B
"road. Either increase the amount of roads "
# \7 L7 r+ M& M7 W" G# A "by increasing the GRID-SIZE-X or "
9 D3 W w- w+ N2 v "GRID-SIZE-Y sliders, or decrease the "
q. {; Z5 ^% ]5 J) ^ "number of cars by lowering the NUMBER slider.\n"* a0 ]1 J" P; z* P" E
"The setup has stopped.")- t0 n* i3 R" O5 G, ~2 {
stop" g q# ~8 B" T% P8 S
]
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* n" _, M+ V. X; m$ o ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
6 n( b. z. i5 t" J7 |2 c* Q6 Z8 |. r crt num-cars1 A$ Y l7 ` l2 [/ `6 L- @ Q" N
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setup-cars: h6 Q, }, P" _/ @9 _3 n6 W
set-car-color
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' z- K+ t* @; N$ X: s6 F ;; give the turtles an initial speed
- d2 }# s: Z& t3 K" c ask turtles [ set-car-speed ]' n) s* Z2 B' \/ n
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reset-ticks
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;; Initialize the global variables to appropriate values; u) r* L; X! }! `; A6 [/ J, q, t x
to setup-globals
5 v* U" A2 o5 q; J g* ^ set current-light nobody ;; just for now, since there are no lights yet
" l" E: G) V- P* x2 X0 F set phase 0
7 }; ?6 q8 C. I4 A2 u% q set num-cars-stopped 09 f) X( l+ q8 \# O# z
set grid-x-inc world-width / grid-size-x, n+ j. q% M/ Y& ^1 l7 H p; }
set grid-y-inc world-height / grid-size-y
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* W% @7 k3 ?9 Z) t ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary0 M( I& i5 r# u$ t7 R" _% i& @6 S F
set acceleration 0.099; o s( R* @ B+ N4 s+ d
end+ t2 C3 [* ]/ P! H
* V$ }% k8 S6 |8 p2 c;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
; r4 C# }. O& b;; and initialize the traffic lights to one setting' c `( z& t& l; I' g4 l
to setup-patches) L3 \& L8 o2 u5 G/ T- ]
;; initialize the patch-owned variables and color the patches to a base-color# t6 \# U1 d9 ?
ask patches' }; o! O. S Y, [3 `6 N' u" L
[
2 [( H$ _2 f! q8 Y# @ set intersection? false
/ X2 Z, m" I+ W+ t set auto? false
# a* ~2 ]9 `9 t( d }% g set green-light-up? true
. f l1 C. |( A! B/ o; N set my-row -1
# t$ G) r: d+ V- n* s7 o2 m$ U* y set my-column -1
& _+ D2 B! y2 D7 r9 i- o set my-phase -1
7 M2 x& O+ z% J- U6 Y! b set pcolor brown + 3
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3 r* E! `. x$ F$ I4 A ;; initialize the global variables that hold patch agentsets M( c0 @& Y; U
set roads patches with
" d$ _* |3 a% k [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 i4 ]; e9 m P8 Q, @ X3 W (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 ^+ G' \( N o* u% Q
set intersections roads with
! l( l5 m& Y3 [2 C' u6 M: ~ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
4 y/ K" Z8 n e) q: U0 ^# ] (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; O* T9 p& X; z/ I0 S
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ask roads [ set pcolor white ]
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end6 Z1 b# O* B/ z) e
其中定义道路的句子,如下所示,是什么意思啊? J( w) b, G/ J0 y8 l; Z
set roads patches with
6 [3 ~5 s a$ j) ?( B' f4 ]) z4 s# Z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or h7 S$ q, G3 u0 |
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 e" n! p( U4 W" 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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