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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。7 P b2 \* q- M$ D0 m
netlogo自带的social science--traffic grid这一例子当中,
4 O! ~9 N( Z4 ^% C$ C5 B; hglobals! z3 ~4 K) @. Z0 G
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grid-x-inc ;; the amount of patches in between two roads in the x direction0 D4 t. X% y% V1 L! X# a( U
grid-y-inc ;; the amount of patches in between two roads in the y direction
4 U: {/ p- [) Y acceleration ;; the constant that controls how much a car speeds up or slows down by if8 ` T9 N! n; @& c! Z$ {
;; it is to accelerate or decelerate
% _& X' w- Y" G( P* W4 L+ k phase ;; keeps track of the phase
2 M6 s. \) T' _4 k num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
+ g/ r, A/ c' I* Q current-light ;; the currently selected light
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;; patch agentsets) J& j. w# t' l3 l: T. x/ x$ Z: E, X
intersections ;; agentset containing the patches that are intersections( |" d* u6 e8 B* `; D6 y8 o1 B; @/ Q
roads ;; agentset containing the patches that are roads& A, w/ r& l B" h5 B
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5 i! o0 J+ z3 z/ p% K7 mturtles-own
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3 u% H/ o* b: a0 U, Q* t1 y, n speed ;; the speed of the turtle0 N# R- \7 h" ?* Z
up-car? ;; true if the turtle moves downwards and false if it moves to the right( ]* w2 B3 o7 R4 \
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own6 k1 d' ^& E" K, n! }, ~
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intersection? ;; true if the patch is at the intersection of two roads1 }/ s: Z5 ]% }* H, O
green-light-up? ;; true if the green light is above the intersection. otherwise, false.! I! R$ d8 r p' v: f* A
;; false for a non-intersection patches.
: ]( y& K z. v8 m3 T6 h my-row ;; the row of the intersection counting from the upper left corner of the
2 D+ g. O$ T2 E; }. O ;; world. -1 for non-intersection patches.9 j1 V$ R% X6 s1 l
my-column ;; the column of the intersection counting from the upper left corner of the3 X& @- f6 V+ x, N9 t
;; world. -1 for non-intersection patches.
' K/ t# o5 h' Y8 O F my-phase ;; the phase for the intersection. -1 for non-intersection patches.
4 N- T" `: G5 d' \ auto? ;; whether or not this intersection will switch automatically.
9 ] N( t, _2 c' s3 j ;; false for non-intersection patches.
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+ L1 M; L7 B; C9 P" P9 n; n: F9 d;;;;;;;;;;;;;;;;;;;;;;
0 D* C9 O# t8 w; {" \) G;; Setup Procedures ;;4 d$ T* @; i0 v) ?6 g1 V0 r
;;;;;;;;;;;;;;;;;;;;;;) v& y+ }. k" E
9 j5 W8 k9 U8 @9 n;; Initialize the display by giving the global and patch variables initial values.0 Y3 Q3 h0 ^, V: V& h' ~1 b( M# o- D/ p
;; Create num-cars of turtles if there are enough road patches for one turtle to
( f# {4 k: T1 w6 y* {+ t;; be created per road patch. Set up the plots.: x2 |& g* X. A" \3 w0 Q4 u
to setup
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setup-globals9 U. a& |: O# p% z
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;; First we ask the patches to draw themselves and set up a few variables1 [+ W* _6 E1 w, Q
setup-patches; Y8 \) { b5 w$ P" Q l
make-current one-of intersections, t) k, q! X! x9 z4 ^
label-current" y$ N( l( _; ]
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set-default-shape turtles "car"
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
0 [ k- h3 l1 A "road. Either increase the amount of roads "# w& U( b2 d0 v/ H
"by increasing the GRID-SIZE-X or "$ l* T% B3 b) @9 o. R' o4 u! W
"GRID-SIZE-Y sliders, or decrease the "
/ A8 j0 s* m$ @ q, L* v "number of cars by lowering the NUMBER slider.\n"
$ r ?5 F7 A l- L6 v8 g8 B "The setup has stopped.")
8 x% J# V: x! V C* [6 L stop/ o1 y1 s7 t0 Q; b6 j9 I, p4 l) }) o) N; y
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color1 P/ c& N5 ^0 b) a) p% p
crt num-cars! m3 ]/ {" Z: Z9 s1 Y$ I
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setup-cars
, F: m a1 g U$ W( W) M7 F set-car-color
$ F1 H3 B+ }/ o" L0 W5 D4 a record-data
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$ [. M4 S3 \4 J. O( m- t& @) C# r ;; give the turtles an initial speed* O* J ~8 R- u' W% | [
ask turtles [ set-car-speed ]
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9 I7 ?( N y) Z; V9 D# f' X% K reset-ticks
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4 O% o/ m9 x r8 G* |( \( v;; Initialize the global variables to appropriate values3 ]4 s8 B0 t% z' \0 ?
to setup-globals
7 y7 j% a3 ?/ S+ `5 i set current-light nobody ;; just for now, since there are no lights yet3 B2 f8 G; G# C9 i
set phase 0
. G* Y( z( b, N8 E% }# B& G set num-cars-stopped 04 o5 E' y" r+ ], [
set grid-x-inc world-width / grid-size-x% O, U N3 d3 l: s0 d# m7 w
set grid-y-inc world-height / grid-size-y
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# v: `1 Y8 v$ @+ Q( n( f0 f: w ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary `" e6 P! q# z/ }* q5 E) O' `
set acceleration 0.099
/ A X3 O6 S# @, |) Q8 i2 |end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
+ P- E/ H" r/ r% F* q& C2 k; _;; and initialize the traffic lights to one setting
9 F. T# n8 L8 kto setup-patches
& D: b: ?5 a# l ;; initialize the patch-owned variables and color the patches to a base-color
/ u9 r1 D" B" E' @5 C; e/ m ask patches
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: R' x* C3 Z; E& @7 S/ W/ r% \3 c set intersection? false
. c6 M3 p3 z' e. X. h5 Z1 S' V% C6 ]) C set auto? false
$ x: ~4 R4 ` D4 o; u& o set green-light-up? true7 Q- q j* i* ~( M
set my-row -1
( s! k B) w5 L* V$ R: w X) j set my-column -1
& @0 q4 b) a" Q/ p- e set my-phase -1
: v# O, A2 Z h set pcolor brown + 30 C! x' A! N7 N ~
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;; initialize the global variables that hold patch agentsets* }) R) c9 Q% H; Y
set roads patches with1 G$ M* U% m. [4 z+ O$ H3 }5 D% s7 o
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( e% c- R& |) K. Y: y4 y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 g. Z7 c8 f- l( o8 P6 }
set intersections roads with
, v4 V% t& o! n/ C y8 F [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and6 `2 k5 o7 h, m4 ?) S* b
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]" j3 \1 m9 Y$ B) @
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ask roads [ set pcolor white ]
' k9 R7 V3 h3 ^! h+ r5 ] setup-intersections
/ N3 W x$ o: i# o7 Q Eend
' D8 i8 `/ \- f6 F- g其中定义道路的句子,如下所示,是什么意思啊?
/ r9 z+ f8 ]+ n* b set roads patches with
' r. J6 i' Z& O3 @% `! N% O0 C( G* Z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! _' }' P6 d- {7 k5 I: C! T7 s+ y. M: [ (floor((pycor + max-pycor) mod grid-y-inc) = 0)] w3 O" T5 h! _
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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