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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。
: N) S8 z0 G. C( T' lnetlogo自带的social science--traffic grid这一例子当中,
% w R; ^. y; v0 j) Y9 ?! Rglobals
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+ z! e5 m7 k9 S1 u# k8 O grid-x-inc ;; the amount of patches in between two roads in the x direction
8 b: ]3 W! b. k" `% m6 n grid-y-inc ;; the amount of patches in between two roads in the y direction3 ~; a G7 n7 f4 Z- g3 F
acceleration ;; the constant that controls how much a car speeds up or slows down by if, d- x4 [3 X- W; A- w
;; it is to accelerate or decelerate
K# N) p/ M, @$ v1 p phase ;; keeps track of the phase+ T5 h- @7 M5 }$ ]' u, `
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure' W6 ]0 L6 e9 W* `. n s
current-light ;; the currently selected light! Y( [- k8 u, K" n, E( t: m
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;; patch agentsets/ f9 F* T1 l5 u* o+ f `( @
intersections ;; agentset containing the patches that are intersections; w6 b- W) C" L5 t# g
roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle
! Y' ^4 @& y% Y# B5 ] up-car? ;; true if the turtle moves downwards and false if it moves to the right( O1 Z" @0 ?( t$ h5 |9 ]% h! R
wait-time ;; the amount of time since the last time a turtle has moved8 X4 K/ g0 ^! `! W: T( p+ x$ M
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1 g/ P( k6 k% I3 e5 mpatches-own
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0 G V/ a3 n+ p4 h! I. q4 w intersection? ;; true if the patch is at the intersection of two roads5 V% I8 s! o: f
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
- J' s& g6 l: B ;; false for a non-intersection patches.
, M' L8 w- ]$ ^) @ my-row ;; the row of the intersection counting from the upper left corner of the
: U' {, {, R+ M& C8 M1 ~4 n9 g ;; world. -1 for non-intersection patches." m1 n8 q0 H Q# f9 l$ J$ ]2 q
my-column ;; the column of the intersection counting from the upper left corner of the L9 K! ~& l) i' Q- }4 Z
;; world. -1 for non-intersection patches." }) \% I1 I: q L
my-phase ;; the phase for the intersection. -1 for non-intersection patches.* ^! N! \6 s; q1 \- F* d) v" O
auto? ;; whether or not this intersection will switch automatically.
- p0 i7 C/ Q& o2 @$ y. V- D% ? ;; false for non-intersection patches.# |* w1 O% ]( h# R) B( T
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;;;;;;;;;;;;;;;;;;;;;;2 ]/ E$ k& S1 s6 }5 O
;; Setup Procedures ;;
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8 q9 Z" }; ?+ u, V: n, `;; Initialize the display by giving the global and patch variables initial values.
! T" N" V- l2 a; \$ n! n; m;; Create num-cars of turtles if there are enough road patches for one turtle to
( |; W8 |! t3 t;; be created per road patch. Set up the plots.3 @! |- Z5 N) }; K. ^: V
to setup
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: R8 `: j Y: ?" h, v- j setup-globals. s. R- E; I3 a# b. K8 R P$ g7 G
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;; First we ask the patches to draw themselves and set up a few variables
6 |& e2 r3 l$ C4 A setup-patches
# D& C! T! r5 K+ z4 {& i) J4 k1 {7 ~' _& i make-current one-of intersections# ^ g8 h. m2 T3 T
label-current
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- A j2 O( }, c6 F5 K* [ set-default-shape turtles "car"5 Q- ]% e9 o8 E: o! t. o. O8 R
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if (num-cars > count roads)- ^' c) j, Z! b
[
% ^- ]$ z) y3 z2 ` user-message (word "There are too many cars for the amount of "' `4 L# f6 K5 m5 D
"road. Either increase the amount of roads "- k% A- G W7 @
"by increasing the GRID-SIZE-X or "+ M: E ~1 {; n! p8 {; D" \& r
"GRID-SIZE-Y sliders, or decrease the "# t, y; O5 X1 O* v1 ^! P4 M# ]. m) u
"number of cars by lowering the NUMBER slider.\n"1 o( C, t, ?) n) L3 v% X+ Y3 ` K
"The setup has stopped.")
" t1 A( \& |# y; `) J% R stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
4 F2 o% G# ~) B8 z. ]+ d crt num-cars
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setup-cars: o, j* _. p3 s8 ]
set-car-color
+ Y6 I h. Q3 l9 T1 ?! s2 [ record-data
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;; give the turtles an initial speed3 s! I, \ `. E9 Q, j: _' ^/ Q0 m5 V
ask turtles [ set-car-speed ]
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0 G# I7 ]6 L/ b reset-ticks
w4 ?, G ~' @5 u9 `7 X: gend
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;; Initialize the global variables to appropriate values
/ C0 [) _9 Y& R; b' p* Vto setup-globals
/ c( T% l# e6 i$ T$ i3 p C' C1 M set current-light nobody ;; just for now, since there are no lights yet2 ~* r% ?* e3 Q- d
set phase 0! @8 a9 g) T) F. M4 N. s0 ?# a& ~
set num-cars-stopped 0
* q. h [3 j h. A. Q+ [ set grid-x-inc world-width / grid-size-x% n: D+ ^ V* b; y7 U+ F% G
set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
: c* g, l0 H2 }, ?% R set acceleration 0.099$ w+ u, U. Q6 b) W( q* J* C4 q7 Q
end3 ?* Z: q) J2 @3 f% z; W6 n& X
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
! \: A! X( A8 V4 V0 S2 V3 t;; and initialize the traffic lights to one setting7 W& Q8 F0 [( Q- V, x+ r; _/ B
to setup-patches) ]( V% ~- a+ ` S, Q8 p& h0 r
;; initialize the patch-owned variables and color the patches to a base-color
c7 i# j& h1 P7 z7 I5 l ask patches4 Z/ F0 B2 B# |
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set intersection? false5 E5 f* `' X& W1 k' }3 m# @
set auto? false
0 J' W8 E" ?, g8 _# H1 N5 ~ set green-light-up? true
C' Y# ]. p& z3 J! x5 E% b+ k6 |& c set my-row -13 n) [5 R3 s* N* |
set my-column -1* I8 C/ k2 U4 R& D' X% v) d
set my-phase -1& s, |$ Y8 j! h. i$ k
set pcolor brown + 3" y- v a5 ^; |. F. @6 E0 n. ~
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;; initialize the global variables that hold patch agentsets
. A# R# t! Z. g7 c" i/ C0 j/ | set roads patches with. T8 D1 H. t* M
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 s' e$ K! O6 Z7 \7 W' A9 {1 ~! y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]; P' P5 y) h- c% u$ ~
set intersections roads with
: Y* B! w9 z% e4 M1 J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and1 D% Y% z7 @! W6 I8 H
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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9 t% ]" |' W, J& N; n ask roads [ set pcolor white ]: l& G6 h0 U/ }2 L
setup-intersections& ?% i2 s" ]0 e! n8 L; M
end
4 n. I; [4 S6 C; v6 }8 p/ A其中定义道路的句子,如下所示,是什么意思啊?& C3 x3 U9 \- [7 H! Q
set roads patches with
7 h' \4 z) n+ Y6 i! H, g [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! j4 h. q3 ?- ^: t- b7 y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* \. x9 i+ _0 r" A" I4 k! I. G
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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