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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。
" [, L a& D0 Y, Cnetlogo自带的social science--traffic grid这一例子当中,- D2 O/ L# }, M) g' J0 v
globals9 y6 {( {# e; _0 |. `4 ?
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grid-x-inc ;; the amount of patches in between two roads in the x direction: Y* R0 [9 v+ X% a2 K
grid-y-inc ;; the amount of patches in between two roads in the y direction
8 B* R, N; H% O8 i. @ acceleration ;; the constant that controls how much a car speeds up or slows down by if
. s/ w0 N/ G! M8 Y ;; it is to accelerate or decelerate( L2 M. E1 F/ P, B- D0 b, l
phase ;; keeps track of the phase
& \5 Q" q+ \/ p( d1 F: U+ Z$ c num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
9 |5 e& q' L. H9 y+ i- P current-light ;; the currently selected light
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;; patch agentsets+ v6 u) W9 R+ t
intersections ;; agentset containing the patches that are intersections' Z$ ` U: E( d/ P' d3 I. ?) n- X1 D# q1 Q
roads ;; agentset containing the patches that are roads
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$ a* i4 Q& g( r; Z6 Lturtles-own( ?& w! r$ T/ l" }
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: D6 F# l/ f$ ] speed ;; the speed of the turtle
$ x1 @0 n3 b4 N" X9 c up-car? ;; true if the turtle moves downwards and false if it moves to the right
! }( R! w. T( u wait-time ;; the amount of time since the last time a turtle has moved/ h3 p9 y8 {% |0 J/ S
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- P1 x; d& x* Dpatches-own, J4 ?5 ~+ C2 j0 I2 x& Y- l6 t
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intersection? ;; true if the patch is at the intersection of two roads( T9 k8 n# n- E! f L7 V! D
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
% J0 E0 h; u! a ;; false for a non-intersection patches.
- x" Z# u5 z/ l! h! N# D! a6 L my-row ;; the row of the intersection counting from the upper left corner of the1 E8 ^* c; _0 m
;; world. -1 for non-intersection patches.
( E+ H- j4 L6 B9 q my-column ;; the column of the intersection counting from the upper left corner of the
7 k8 M# w2 j6 @! e ;; world. -1 for non-intersection patches.
+ p- N# B k2 q5 _: H, h my-phase ;; the phase for the intersection. -1 for non-intersection patches.
* u. I0 ~; D, Y; I7 r auto? ;; whether or not this intersection will switch automatically.
# l( `' D T; ]% q0 w, e6 n ;; false for non-intersection patches.6 s9 }! D$ [7 X' T9 T& s8 x; E
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5 Z, E& @- ]/ Z5 l. R- c/ k;;;;;;;;;;;;;;;;;;;;;;
& s5 O- S' B! l4 ?9 x! };; Setup Procedures ;;3 B; X- Y! U. S! m
;;;;;;;;;;;;;;;;;;;;;;
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% q* Y! q. {! h. v( G: M;; Initialize the display by giving the global and patch variables initial values.+ G8 h, i) B. u% j4 p
;; Create num-cars of turtles if there are enough road patches for one turtle to
/ L( u2 i. M. q) Y6 m( S- Y;; be created per road patch. Set up the plots.7 Y2 T- I. \" `, |1 _1 E, s
to setup
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/ ^( y( l! X; A; i% J setup-globals
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6 [. s8 ?! a6 | O/ v2 ?' {$ s ;; First we ask the patches to draw themselves and set up a few variables3 J+ a% I. U4 I( ^2 ^+ ~
setup-patches
% T% k- {& D/ s5 \$ N! a! m8 k make-current one-of intersections4 F' a1 M7 [. ?- d" _
label-current, q( D9 E7 p; h/ F8 @* A% r) ]
) \9 N0 J: \1 S+ L2 h q! [7 j4 g( ^# f set-default-shape turtles "car"+ j) l, Q- Z0 D @( l5 W
4 `9 W- }6 L# D( x9 k if (num-cars > count roads)9 g0 m3 s+ j) p7 q
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" {! E# ?- m9 Q( B, j user-message (word "There are too many cars for the amount of "+ M @0 `; Z K# ^
"road. Either increase the amount of roads "
2 m% l2 ^: X; k ] "by increasing the GRID-SIZE-X or "
, E0 C: k1 i$ h0 u/ D% q "GRID-SIZE-Y sliders, or decrease the "1 Q! C- K# f0 X: R
"number of cars by lowering the NUMBER slider.\n"
9 P. E5 V1 @/ A! z3 M& L: z "The setup has stopped."): N8 G& c8 o6 n9 y
stop2 y& c* X4 v |3 k9 ^2 D
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
% s+ P# O) H! P5 k( p crt num-cars
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( q( |% M( e/ u: |8 e; j, U setup-cars8 `1 e; u) F0 e4 Q5 b+ K0 j
set-car-color
* m% K0 x! u" }3 x; |, b record-data
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;; give the turtles an initial speed
! @& j' }9 t2 u' U9 G ask turtles [ set-car-speed ]
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8 X1 G* p4 v* P% d; \! x5 p reset-ticks
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;; Initialize the global variables to appropriate values
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% v( M7 k1 A$ V' } set current-light nobody ;; just for now, since there are no lights yet
6 X; S& [5 h4 c" d set phase 0
0 J$ R5 I0 \" |2 o( u( h set num-cars-stopped 0/ C' ?' G" X+ H. J G% ?/ x9 p
set grid-x-inc world-width / grid-size-x$ G4 B$ X# l" y( u6 R) r8 y, Q! U
set grid-y-inc world-height / grid-size-y
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0 Q8 R# t- W$ P c- g ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
+ Q2 }+ N/ l2 A; h# C" A- @4 b set acceleration 0.099$ }' M* R. a0 V$ \
end% p! \$ ?9 C" T
0 \2 C y) f8 b6 ~6 V7 x;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
, n8 s% I; ]! Q, t( N; |;; and initialize the traffic lights to one setting
' j. x& n4 u+ M4 Bto setup-patches
7 Y9 l0 W6 M# G8 y ;; initialize the patch-owned variables and color the patches to a base-color
, I; y! a1 h6 C( J! N* [2 } ask patches
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set intersection? false+ O3 D& I& X/ p" e4 A" e
set auto? false
4 @- P! c% M: j, @ set green-light-up? true
: ?6 r' ^7 Z- e2 u. I set my-row -1
[2 Y" B' Z$ z/ D set my-column -1
8 {3 L" \3 t z# G set my-phase -1( M3 o1 E6 J% k6 @/ w- n
set pcolor brown + 3* y( G% G; D$ [" C6 R e
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i7 s/ t9 k% v ;; initialize the global variables that hold patch agentsets
4 L0 }8 A9 w! E* k) w1 L set roads patches with3 h, S" Y! t$ Y& f
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& \0 f; X, {6 Z6 z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 n7 j, y0 m1 e6 l$ h set intersections roads with6 |0 |* b0 ?, n" E! x# x
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
6 V U8 b+ w. m6 L/ a8 s (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
0 S( i9 u- U" J- g$ c( C setup-intersections. p3 K( V" i$ |% Q0 ?; y
end
7 ?: ?4 i( K( `# ]) R其中定义道路的句子,如下所示,是什么意思啊?$ U- ~( U$ b2 b3 y/ J: Z; C
set roads patches with
4 p7 D3 E4 B6 Y: ?" Z, [ M( ^ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 ]) H+ {9 i7 S1 `
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]. T/ R/ f! ]6 b$ ]" ]3 d% Y
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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