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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。
2 x7 f2 a- W5 c3 n2 I0 ?. jnetlogo自带的social science--traffic grid这一例子当中,
& m+ ?% K g7 e9 I# }* Bglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
( x9 m8 _3 A% |1 }/ }( J grid-y-inc ;; the amount of patches in between two roads in the y direction; k s% M. ], z
acceleration ;; the constant that controls how much a car speeds up or slows down by if
1 s3 q7 K) h5 V, p+ u7 P ;; it is to accelerate or decelerate
; u* o* Z: w! F, J, K' B; {( W phase ;; keeps track of the phase
- N# K# ?( `3 x' O( T num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
% F9 k0 F% _1 D, ~/ Z& {2 {" @7 m current-light ;; the currently selected light
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;; patch agentsets# X6 e: Z$ _6 J
intersections ;; agentset containing the patches that are intersections7 c; Z- x& _/ Z; ^1 O4 l
roads ;; agentset containing the patches that are roads
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turtles-own
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4 ?% Z2 Z9 p3 Q8 u( T& b speed ;; the speed of the turtle
1 ~. ]- d; T* i' J: p! _ up-car? ;; true if the turtle moves downwards and false if it moves to the right4 U! K* v( G6 E' H, d
wait-time ;; the amount of time since the last time a turtle has moved
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- C" _; |' m* Q$ jpatches-own6 ?- f9 f: o8 f& \1 [
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intersection? ;; true if the patch is at the intersection of two roads/ M; J6 _* P n% u. {
green-light-up? ;; true if the green light is above the intersection. otherwise, false.. v0 X, h; d4 Q! v2 Z0 g1 @
;; false for a non-intersection patches.
2 e6 Q: Y8 d4 i. c8 c8 s my-row ;; the row of the intersection counting from the upper left corner of the% v: E. d1 ]6 `0 `& J/ q/ {+ {
;; world. -1 for non-intersection patches., V% S! K. ]4 c, Y
my-column ;; the column of the intersection counting from the upper left corner of the
7 h, B. s! u1 x/ R! a x6 b$ u ;; world. -1 for non-intersection patches.
% j$ }5 O2 T0 Y+ ~' R my-phase ;; the phase for the intersection. -1 for non-intersection patches.- g0 J2 [; y2 X0 S
auto? ;; whether or not this intersection will switch automatically.
5 s0 `) B( S7 W6 f ;; false for non-intersection patches.
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/ r4 j( ~, L6 A! f0 @' {
;;;;;;;;;;;;;;;;;;;;;;
! b7 M4 E& O, k;; Setup Procedures ;;1 z% z" `# t* D* m7 J
;;;;;;;;;;;;;;;;;;;;;;0 A0 B& E% i( a: h
; a) k$ N' T! x4 Y;; Initialize the display by giving the global and patch variables initial values.; y6 x0 C n5 k5 X2 r
;; Create num-cars of turtles if there are enough road patches for one turtle to# L4 p5 v$ s. p* f& H
;; be created per road patch. Set up the plots.
) `5 F# [- q" Q- z( Wto setup9 d( Q4 l9 L8 {
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setup-globals4 K2 \/ t% z( b
& {+ ?. e* L' V1 C9 j* j ;; First we ask the patches to draw themselves and set up a few variables" y0 \9 B6 q0 q6 ^
setup-patches: m* l4 `: N7 r* t$ I
make-current one-of intersections6 }4 [7 `' F$ {8 _1 _
label-current
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* L6 l! v" X1 j! i! g" I6 N. g6 A; C7 X set-default-shape turtles "car"- f8 E' X" q# D! f/ b# R; Q9 @
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if (num-cars > count roads)7 O( ^' P- p8 W& ~ b( ? I
[
" n$ }1 y' n2 ?5 K user-message (word "There are too many cars for the amount of "
: D2 ^2 S, ?1 U" I' h; r/ n "road. Either increase the amount of roads "
j! y, ?! U( ]2 t5 S O "by increasing the GRID-SIZE-X or "
1 F! n0 t+ _9 K4 l! W% E9 M "GRID-SIZE-Y sliders, or decrease the "
E2 Y% E n. a "number of cars by lowering the NUMBER slider.\n"" x" @, o. S( a2 A
"The setup has stopped.")
* f. f# M1 M2 T2 n& s stop
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3 b7 p% x& b& l8 K& B ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color& _6 D& D' v1 y8 }$ B
crt num-cars" J9 g( |2 m c3 {+ {- E, _! E
[
7 S& s h) l! H4 R* Y X* q setup-cars5 R' C) U i, n% |6 c& z
set-car-color
3 A, |3 p3 U; i" r& H" g3 i record-data
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$ u" A I: m7 Y( t ;; give the turtles an initial speed
2 s% L1 u4 r( `2 E ask turtles [ set-car-speed ]7 w/ m2 @. ?0 W) {3 ~# U
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reset-ticks0 Z h+ L5 L4 K% I9 `5 a) l7 P
end
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/ r$ u; B) P2 w- _( {' b9 M% c( Z$ h;; Initialize the global variables to appropriate values% j& s; Q; h# I
to setup-globals/ d8 x3 Y. N0 J* I# b; k# k) k q
set current-light nobody ;; just for now, since there are no lights yet
6 e4 b& X6 H( u* Q' H8 [ set phase 02 d$ S0 t. Q9 q3 M/ c/ w
set num-cars-stopped 0
" R7 t( l+ m. O$ {$ B% @7 H- v, ~ set grid-x-inc world-width / grid-size-x
9 J7 t$ w$ o; U1 m% F set grid-y-inc world-height / grid-size-y
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; C+ Q' Z# G5 \$ k9 _ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
8 |: l: l% L5 Q4 L D" ` set acceleration 0.099
J( ~2 C) \6 H* t E8 Dend5 F2 m! G( z) H: I8 c1 ?
* Y3 K! L$ H0 o$ T- V4 _: R h/ |;; Make the patches have appropriate colors, set up the roads and intersections agentsets,8 E7 I9 t+ U$ P7 r
;; and initialize the traffic lights to one setting7 L$ Y& D) J$ i2 a
to setup-patches
- F$ h! r/ y5 j# i6 R2 c ;; initialize the patch-owned variables and color the patches to a base-color
/ j* r7 V& F3 ^6 x9 l3 [% Z ask patches
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F( p5 _; _1 u4 b set intersection? false
5 t4 \* `$ Q W* v( t& w3 V+ b set auto? false! Q" `$ w/ z) o/ S2 l0 l9 S8 e+ ~. }
set green-light-up? true- h" D) X5 Y: ~0 l( U9 t1 B
set my-row -1
% J& m3 B0 d3 P* ~% H( y7 C$ Z set my-column -16 j; ^0 H N; D
set my-phase -1
! I z! j' B1 k7 ~& c9 Z! Y set pcolor brown + 33 f2 d! o1 `+ e# J
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}% i- }2 z7 L$ R9 [+ Y6 r ;; initialize the global variables that hold patch agentsets' p. ~0 M) p1 J
set roads patches with
4 G0 `: @( d1 r/ H6 M1 j+ l [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 p8 u, V+ ~2 P. }
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& ~6 j( q! j5 t/ a set intersections roads with+ _2 O' f8 E) m( v
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
! p1 ^7 i0 y# x+ \5 z) S, A* y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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^+ t0 i$ j P) p9 a7 l/ ] d2 L ask roads [ set pcolor white ]
; w0 l2 q/ B. t- I setup-intersections, Y; T1 G3 X+ [& y" [; G: j
end9 `5 Z1 ~: n1 X8 _3 A7 e
其中定义道路的句子,如下所示,是什么意思啊?
/ A6 u5 f* k* b) T- h9 Y* ] set roads patches with$ S: g1 a9 C1 t
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& e0 v( R5 G) e- [$ @ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 x( n# _. X y8 A
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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