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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。
9 k. W8 w5 T- D0 i8 N9 qnetlogo自带的social science--traffic grid这一例子当中,
8 \% Y. S& [7 I# G$ E+ gglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction& d$ b" O; U7 L5 L$ i/ o+ w* c, F
grid-y-inc ;; the amount of patches in between two roads in the y direction
4 V4 h! u; \6 R& e# B! a acceleration ;; the constant that controls how much a car speeds up or slows down by if
: W! G- l# O& {# A, O# G ;; it is to accelerate or decelerate
9 j, T8 }0 H. U phase ;; keeps track of the phase
& F+ t& }% [ ^1 i: a, h num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
! O; w e! M$ S9 G! E+ E$ K current-light ;; the currently selected light
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;; patch agentsets
6 }4 p& h- b# k+ @5 u+ U5 S2 N intersections ;; agentset containing the patches that are intersections
: T m& G' Y+ @/ C3 J roads ;; agentset containing the patches that are roads, Z' ^' \ Y5 T9 @
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* N2 z' B! Z7 v; z- _turtles-own
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4 V! X: C n5 n2 _8 k; {. f speed ;; the speed of the turtle
+ A# q+ G* |- h% m) `( S+ \# G up-car? ;; true if the turtle moves downwards and false if it moves to the right" ]1 p0 v. D- ?4 g4 a, S6 o
wait-time ;; the amount of time since the last time a turtle has moved o6 ^- B! M7 i. }; z
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads/ v; z6 k' R9 n) p0 L% _
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
" s, ?* B/ h' v% @2 W! x; G ;; false for a non-intersection patches.
?( q+ u& y) _: G. T8 F my-row ;; the row of the intersection counting from the upper left corner of the6 I0 d7 Z: F% ^: D1 [4 l
;; world. -1 for non-intersection patches.
6 \8 p1 e" E" Y% M' J. _ my-column ;; the column of the intersection counting from the upper left corner of the- g. J$ K9 w8 Y7 @& b
;; world. -1 for non-intersection patches.
. r/ x; O' I( m) w- w+ \2 r my-phase ;; the phase for the intersection. -1 for non-intersection patches.8 C5 k. T/ u6 C% @) N
auto? ;; whether or not this intersection will switch automatically.
0 K& g/ C. o& } ?" h5 N) b ;; false for non-intersection patches.0 G3 S5 A6 g. |, m9 I
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;;;;;;;;;;;;;;;;;;;;;;
8 M/ a7 B' _# f! S9 X% g;; Setup Procedures ;;
$ m# b) p6 L! c& U, k2 y;;;;;;;;;;;;;;;;;;;;;;
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; }7 x# o6 B5 F;; Initialize the display by giving the global and patch variables initial values.
/ E# o3 Q, I! n; R2 I) t! k;; Create num-cars of turtles if there are enough road patches for one turtle to
# h3 D2 ^/ |" K% K;; be created per road patch. Set up the plots.+ \5 p7 }5 h& a( Q1 _* n
to setup d u. @- F' }, L5 u& X* e
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables9 {7 x- j, B/ s. O
setup-patches5 V$ q |( ]" ^6 ^0 x
make-current one-of intersections
- B% S- o+ c1 U- d. W7 h& j label-current
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& ~6 ]6 ^* a) O/ m3 J" W set-default-shape turtles "car"3 [7 [ _1 a% ?! ]$ z/ e; A3 N6 u3 M
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if (num-cars > count roads)$ r% J: F, R8 s0 Y) W
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user-message (word "There are too many cars for the amount of "
/ C7 ]2 Z* a) X6 Y% R "road. Either increase the amount of roads "; p9 a& }, A" S* M; `; a; }" ~7 f8 h# ?
"by increasing the GRID-SIZE-X or "
/ F3 a3 c3 f5 x; u8 r: E "GRID-SIZE-Y sliders, or decrease the "- D* y3 v; \& l8 Y" \
"number of cars by lowering the NUMBER slider.\n"% ~7 t( p. G3 K6 ^- L
"The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
' H3 j }5 E8 c# b5 y. { crt num-cars
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setup-cars
! }8 h8 @! k1 r set-car-color
: l! t0 ?) `$ r k" |- p% C record-data
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;; give the turtles an initial speed! A) w) l! D& k4 S' z4 d
ask turtles [ set-car-speed ]6 ~1 G! k3 O v0 `7 O0 j$ N5 `3 D+ Q. [
0 b) l& K7 E- o+ s2 q$ D3 h reset-ticks$ h' o; x1 V1 X, n# a0 ?+ N
end, H: ?$ t1 H0 J% v. u8 g
8 R% a$ L1 h& _: h: H;; Initialize the global variables to appropriate values; |. _$ e: w& b3 s! R8 J3 g: T
to setup-globals2 \0 A) x/ t M2 l
set current-light nobody ;; just for now, since there are no lights yet% q! l+ p# E; @
set phase 0/ Y2 z# T+ ?8 z
set num-cars-stopped 0
) P8 g0 w5 z. e# T set grid-x-inc world-width / grid-size-x: ]4 Q; w, D) K$ l
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; ~9 y9 b! ]9 \6 H8 \7 ]5 [* }
set acceleration 0.099
. L% q1 L" U( ?! l$ h8 A: M" ^end
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3 E, J" I9 f! Q X; t7 Y;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
5 X* J0 ]& N. W1 S" Z; t6 R& K;; and initialize the traffic lights to one setting
9 |0 F1 F9 l4 Q6 ^+ y7 k8 I6 [* `- rto setup-patches
) l w; @2 c$ ]& J) X/ P ;; initialize the patch-owned variables and color the patches to a base-color( _ A, `- K1 h/ h3 Z$ G! _
ask patches j4 b- m' i4 U7 B( ?
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set intersection? false
1 {$ c* a( u6 `4 r! o3 [1 u5 E set auto? false* X4 ]! v. u3 e" z5 ]
set green-light-up? true: L" t! A" H% b
set my-row -1
4 v9 p- D. G* k6 K3 g. r, g set my-column -1$ S, a3 e/ O$ e1 i; n% X
set my-phase -1 ]6 c" w, S. S
set pcolor brown + 3% ]* r8 r' N2 {5 D8 W
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8 ^7 `+ P0 s. f& Y/ W ;; initialize the global variables that hold patch agentsets' T3 z) J/ l# b0 @* F4 {
set roads patches with" l9 N c! ~ o6 q$ z+ O
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ F1 T s4 t( Z% T7 |; V6 c
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" f0 }. \% @ m B5 @5 \' h set intersections roads with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ O& w) h" h& A9 }& j
/ n/ T/ i' O5 N4 F9 E ask roads [ set pcolor white ]
& Y" R) i) L L/ k( M U* `* o# u 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?5 p* m* i- ]+ e8 g
set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)], X# ^2 [& _9 h" w$ P
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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