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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。3 g0 p1 J: \; C- g
netlogo自带的social science--traffic grid这一例子当中,1 l' L1 D7 |( m i. u/ o9 I
globals! _: h9 x6 k% {1 _, p
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grid-x-inc ;; the amount of patches in between two roads in the x direction* p9 A) P2 I# j. P
grid-y-inc ;; the amount of patches in between two roads in the y direction! V- r* A) s' X7 k; H4 e
acceleration ;; the constant that controls how much a car speeds up or slows down by if
, V5 H6 r: k; l ;; it is to accelerate or decelerate
) `% |' a) @' e9 P) N% a" K: s phase ;; keeps track of the phase0 w5 Y+ E) D ^* _7 s
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure+ v3 F6 f3 b+ ?/ c, x
current-light ;; the currently selected light
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0 K" f; y/ C# k9 d) r ;; patch agentsets- q6 I; q* x2 M$ X
intersections ;; agentset containing the patches that are intersections
/ e' D" `. T/ i! a- j$ P roads ;; agentset containing the patches that are roads
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2 \% x! s7 z0 fturtles-own! s3 o0 Z+ g* W9 d* p: N4 S+ ?
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speed ;; the speed of the turtle
1 f; A. u( v3 _# N- O' G# P. k: J0 s up-car? ;; true if the turtle moves downwards and false if it moves to the right
% m/ R! l6 K) A2 p7 c: s5 i wait-time ;; the amount of time since the last time a turtle has moved
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/ g8 k6 \! N5 s! V: D7 K. J) H# o2 upatches-own; z* z. D+ p, u4 T" E8 t" i. M
[
. X/ [+ s: U' G intersection? ;; true if the patch is at the intersection of two roads e9 R* l( m. a p- f' X) O5 [* r
green-light-up? ;; true if the green light is above the intersection. otherwise, false.5 t a6 i! I; L& W* U7 S: @- z
;; false for a non-intersection patches.
) J& @: j9 _1 v9 m5 R0 H* x( w5 _ my-row ;; the row of the intersection counting from the upper left corner of the3 f% P7 t) [6 @4 L+ _
;; world. -1 for non-intersection patches.% T9 j7 M$ ^) B4 g# q
my-column ;; the column of the intersection counting from the upper left corner of the
6 P; U8 j3 [' s4 x8 Q. T- X ;; world. -1 for non-intersection patches. y, T* F( { k/ N( _
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
: [. a" r$ T. |8 j- x) n9 h auto? ;; whether or not this intersection will switch automatically.
7 {8 o. e# E: g7 t) {8 w ;; false for non-intersection patches.- `2 C& `& V' Z; m; D( B' |8 Z% H T
]
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8 U: b) S- M( x;;;;;;;;;;;;;;;;;;;;;;
+ H' I! w K4 X) s5 A;; Setup Procedures ;;
. \" l8 G2 S i0 V" O4 c# t;;;;;;;;;;;;;;;;;;;;;;
* \( G, U) ]: ]& S3 H9 j1 C+ \4 y! @- ^% u+ [5 d
;; Initialize the display by giving the global and patch variables initial values.7 F. ]# E: z, n& D+ P1 q
;; Create num-cars of turtles if there are enough road patches for one turtle to
* f# {9 k* J) a6 g;; be created per road patch. Set up the plots.8 m9 A5 X: e* @0 s. E
to setup6 C- ^1 s. \8 {; {! X
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables9 u6 d Z( }" ~4 w9 V
setup-patches
5 Z7 u) O' H$ s* O: ~: p make-current one-of intersections
2 ]; Z- ?1 E" C# G8 R/ y. A1 ^% @4 K label-current
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set-default-shape turtles "car"& P# Z9 V- q" G0 W' W6 Q
/ K# p: x4 U; j% o0 `& a2 V if (num-cars > count roads): i3 j4 H) ?. C+ f1 J
[
) p5 w6 z7 p i8 D+ E$ \; [( D, q H0 [ user-message (word "There are too many cars for the amount of "3 k' L9 ~* B% M! F% o8 ?
"road. Either increase the amount of roads ", T5 s+ s+ p$ R7 w6 C# P, T
"by increasing the GRID-SIZE-X or "! d& }3 v: v& r2 {
"GRID-SIZE-Y sliders, or decrease the "
' o' \6 l. B) T; ?5 c "number of cars by lowering the NUMBER slider.\n"
5 r. ~4 R- K. W" b# X "The setup has stopped.")6 J0 P2 \% x9 e0 w" l. h/ H9 I
stop
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- m" M- t/ L/ a' O- O ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 [5 @+ k n- C4 F
crt num-cars5 b H4 P1 b8 ^. s& p1 W2 P8 F
[
3 _* `; W3 k0 K6 U1 w2 ?8 b! G setup-cars
0 z ?2 p" N0 t8 F& y$ l9 c1 r& f set-car-color; q* s, r& W S& [
record-data% N" \ \ T. _
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;; give the turtles an initial speed
k q& } W9 {) C9 D ask turtles [ set-car-speed ]6 s% n9 F& R/ l; @$ O0 }! Q$ A
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reset-ticks
2 F+ {3 G& H) Q# }+ u/ J: [$ Cend
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% P! \ U' n l+ f0 N( `: X;; Initialize the global variables to appropriate values" w: T3 j* E. X0 q
to setup-globals6 D" }$ Z' E- K. R. W% r! ?
set current-light nobody ;; just for now, since there are no lights yet0 A6 v- o- h5 E& i
set phase 0) {. h- B f; L/ Q6 l
set num-cars-stopped 0( p1 s( f" d! u/ w2 v# A5 Q
set grid-x-inc world-width / grid-size-x/ r, j- ?5 d2 f
set grid-y-inc world-height / grid-size-y
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) }2 g! H T5 U' ?7 G' i( ? ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
: N! p" p9 S$ G( m1 m set acceleration 0.099, k, y J3 c% n7 E0 L6 x$ O
end% s1 r) P, s6 g, D/ {; m
9 O# W$ _2 `8 @, }% l;; Make the patches have appropriate colors, set up the roads and intersections agentsets,: O: K9 C9 h! ]- u$ i: I- _
;; and initialize the traffic lights to one setting* a) n* M( i Z: |9 z N/ S L
to setup-patches1 L7 B6 y8 D- h5 X8 e0 J
;; initialize the patch-owned variables and color the patches to a base-color5 G9 X" f. [+ P" L$ e# V" G
ask patches p' ?# |, @3 P5 d: u5 i/ z9 T
[
5 L# h; E# t, L# z4 l7 S, H5 |6 f set intersection? false" F! L5 F, O8 H l O' W6 N4 [
set auto? false
; S- K0 R2 J' V set green-light-up? true9 F/ l- {( {+ o; i2 ]8 n1 n: i
set my-row -13 `9 `5 x7 i1 i8 e
set my-column -1/ ^2 H" v1 Q; u# W
set my-phase -1( H2 h! x; E9 _3 n( S2 G
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
+ X0 j, D+ Q$ q* O' M* c0 f set roads patches with
' Q( V6 M6 h0 x1 u [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 ]/ e4 h1 o5 `
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]! U3 U! p/ @0 t
set intersections roads with- |; Z, N* \4 O5 K1 I
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
& I- O* R- O& j (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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9 s( ~7 T+ c4 v* e ask roads [ set pcolor white ]
5 E, V, Z6 }8 w( Y# k2 H setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?: W1 z6 v4 }! \3 o7 e! S
set roads patches with4 ]4 a- o. B' X- I% q" a
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# B% k$ ~# f: I. V I* O (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ o+ K) d# G+ @, Y5 e& w
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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