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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。( q5 J# `) q+ e% _4 U6 y- h
netlogo自带的social science--traffic grid这一例子当中,
1 Q: J% n, P0 m/ Q' h Fglobals0 ?1 N4 @$ j1 H$ [; e5 }6 [
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- _9 q8 S" C+ K& u0 y3 g grid-x-inc ;; the amount of patches in between two roads in the x direction
5 K8 e1 s; x, s2 E: Z9 H" S grid-y-inc ;; the amount of patches in between two roads in the y direction, x1 |1 E3 ^4 t6 I
acceleration ;; the constant that controls how much a car speeds up or slows down by if
9 Y/ m* c* f0 T& M5 Q1 M$ q ;; it is to accelerate or decelerate' Y' I3 c: H# T
phase ;; keeps track of the phase
$ }0 p! b$ e+ F# ^ ]' r4 p num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
0 F/ M% A3 Y8 m7 [5 S- [0 x4 W; ^ current-light ;; the currently selected light
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6 q( f! M! L+ o4 \5 j. R! ~ ;; patch agentsets
3 G9 K0 |4 |( n9 o& B3 f' q! u intersections ;; agentset containing the patches that are intersections" b; t7 u6 U7 G# z" u
roads ;; agentset containing the patches that are roads! M8 q! p2 m) N* F, ~
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/ D: ?/ C: L& f2 fturtles-own4 R$ ]0 U, H3 e6 d/ [7 \
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9 X) Y& m! l+ @* Z: N G& k# |3 G7 L speed ;; the speed of the turtle0 M, z1 Y) V4 M \$ b# {! ?
up-car? ;; true if the turtle moves downwards and false if it moves to the right' \* U5 Z- M0 I( c: Y3 Z2 o
wait-time ;; the amount of time since the last time a turtle has moved
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! d2 L. w, l8 H3 Fpatches-own9 y) h4 M3 v" u: C
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/ t* m$ o* i% l# g. x9 m* c intersection? ;; true if the patch is at the intersection of two roads" [& z9 k. | ]0 a; S% t
green-light-up? ;; true if the green light is above the intersection. otherwise, false.* ]2 c, Z" L# t
;; false for a non-intersection patches.5 N4 A0 r6 a2 D, b0 }/ ~+ @
my-row ;; the row of the intersection counting from the upper left corner of the7 w' `" f8 `' K
;; world. -1 for non-intersection patches.
0 R+ k" l l) _7 X my-column ;; the column of the intersection counting from the upper left corner of the1 o- y& W( C% v& c% ?0 E
;; world. -1 for non-intersection patches.
, `# X2 a9 ^( j) c; G my-phase ;; the phase for the intersection. -1 for non-intersection patches.
7 z5 Z) d* \' d! V auto? ;; whether or not this intersection will switch automatically.
$ w, K! R) j, E$ F ;; false for non-intersection patches.
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9 ~1 k- p- I% h" t/ x W+ Z;;;;;;;;;;;;;;;;;;;;;;
+ ^# c3 X* z3 @;; Setup Procedures ;;
1 [8 p8 F Q# {5 }# a1 |;;;;;;;;;;;;;;;;;;;;;;
1 w8 Z: O, G3 x+ S. n
9 K+ l3 O$ O1 s) d* O' k& ~" n;; Initialize the display by giving the global and patch variables initial values.
, v! S b4 T7 T9 {;; Create num-cars of turtles if there are enough road patches for one turtle to6 ~$ q6 e1 f: [2 y: ]: S
;; be created per road patch. Set up the plots.8 T5 Y4 h, m2 W& Q/ `1 T" w3 Y. g
to setup
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/ r/ j3 C9 y8 _ setup-globals
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;; First we ask the patches to draw themselves and set up a few variables" e" h K! }# X( l
setup-patches
4 ]1 F" |. ]2 [- o- Q make-current one-of intersections/ q4 G9 i+ i# u1 _5 u. L7 L4 O
label-current0 K" f) Q" W0 S* l9 ]( g
& i+ F3 y0 r4 T9 o$ }/ e set-default-shape turtles "car": r+ c. r u6 V+ o5 ?
" E2 e+ b; n" i2 v4 I, z if (num-cars > count roads)
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$ `' H2 V0 l, x# N; u% Q user-message (word "There are too many cars for the amount of "
' t- t+ W1 @2 `2 C' w7 d1 U "road. Either increase the amount of roads "
( ^, ?3 D& Y( {+ @ o/ j3 J: b "by increasing the GRID-SIZE-X or "8 R% M5 s; a( O$ Q' E
"GRID-SIZE-Y sliders, or decrease the "
$ _& i6 z Z. h6 n4 f "number of cars by lowering the NUMBER slider.\n"" R( x0 W9 {. F+ G
"The setup has stopped.")
8 Y3 E4 [& J& O( D8 H% T3 p stop/ [ s" e/ k& L% \+ `/ Q/ R+ y
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# q2 b: w/ a& n/ h7 G/ D! c$ O5 U ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
' G7 ^+ p4 |/ U( B% O crt num-cars; n) V4 T3 |4 R4 }! d. F) A
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: L4 a2 n( } h8 G% w: e9 q0 _ setup-cars
5 p1 r# k8 V1 `1 s/ ?3 {6 |! A set-car-color
+ v3 \+ ]/ S4 d& { record-data
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;; give the turtles an initial speed
% B3 x8 F2 u" S1 z ask turtles [ set-car-speed ]
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6 s" M, c* o" o+ c reset-ticks" g8 G% \3 c4 p1 F* G0 s
end/ r0 y% I3 W8 y1 L2 P' Z& a
# y8 O9 r/ T' h4 L! c;; Initialize the global variables to appropriate values
8 v$ } Z- A4 m: P0 Eto setup-globals
7 L" w( H5 x; e set current-light nobody ;; just for now, since there are no lights yet
! \% A; u) l/ N+ h, o/ {2 d! _- d set phase 0
! A! F! q7 G+ E8 O7 E set num-cars-stopped 0
i$ X9 G+ J- P5 E set grid-x-inc world-width / grid-size-x
6 K$ D+ u- p6 S" U+ X1 Y set grid-y-inc world-height / grid-size-y% i+ L) V& g* [! j* ? G
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary( l" ^- T8 a% M, W4 O6 J3 p# T
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
6 o; q( t; G5 U2 w. U;; and initialize the traffic lights to one setting
: m; G9 M: `; m* Z- @; Tto setup-patches
7 C2 U0 j+ t; W0 R2 f9 t ;; initialize the patch-owned variables and color the patches to a base-color4 Z5 _8 k0 o U% q: ]8 d" F
ask patches4 t3 \8 C/ @; z% i/ M4 X
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set intersection? false% N. S- }7 l+ ~$ S- t. i Y6 z2 h7 w
set auto? false
4 z: I0 N9 ]5 y$ Z4 \% N2 n5 N set green-light-up? true
) o0 ]7 G, E" {% S- b; Q set my-row -11 F5 t9 E; x: [, N
set my-column -1
F F) G7 e. J$ H set my-phase -1
6 t4 i6 m5 ]! l" a6 ?7 U8 s% t set pcolor brown + 3/ z9 [/ { b: f0 r! y1 v2 j) x
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;; initialize the global variables that hold patch agentsets! [5 c& i* i6 q* o8 ?3 T6 D
set roads patches with' _/ f9 s( w! D @2 `2 g
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% n3 v0 b+ l+ R' c (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 e' o7 j s* P6 N% Y" k! N% W
set intersections roads with
' W6 U* ? z& E8 X" A } [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and# J. M8 R7 F9 o
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]4 m4 C( X- f" E' k+ k6 ~
setup-intersections
" t9 D5 k9 ]* b9 g8 Xend
+ r- P! L) l! P; R; d2 g5 x其中定义道路的句子,如下所示,是什么意思啊?0 s+ f6 q% |$ P
set roads patches with N+ {, M8 x3 Y8 W# ]. R$ ^
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 c4 \& K T4 f) P4 C
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 e* B. Z9 u1 X1 | h" a6 Y: v
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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