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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。
& B! |$ X" X; N0 |9 u* t$ Jnetlogo自带的social science--traffic grid这一例子当中,* o* g' Y* n6 Y; H, N3 j/ t
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction! Q2 h! a1 b; {4 P* J1 i
grid-y-inc ;; the amount of patches in between two roads in the y direction" i# m* c% v2 \" r4 W
acceleration ;; the constant that controls how much a car speeds up or slows down by if, m! C( u$ A I$ O
;; it is to accelerate or decelerate
8 B& d$ J. A# {- R phase ;; keeps track of the phase
& [$ B' R3 }" h5 H5 ? num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure3 t8 S, r+ n! {* W3 e
current-light ;; the currently selected light
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;; patch agentsets
5 i! R; s5 C: `3 ]* q intersections ;; agentset containing the patches that are intersections
& E# e7 ~1 G1 f( r roads ;; agentset containing the patches that are roads
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turtles-own, D8 C; w* y. t1 N5 z* S
[
4 ~0 H2 ?2 T2 V; n speed ;; the speed of the turtle# E5 d$ W3 h2 F y/ C! }# K
up-car? ;; true if the turtle moves downwards and false if it moves to the right3 I1 d9 o C) |/ E! L; y1 r2 D. ?
wait-time ;; the amount of time since the last time a turtle has moved) |5 Z- S( p7 ]$ w" ~1 o
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' r/ @, \5 W/ V0 Opatches-own2 O k3 [' m, V9 A; W4 L
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intersection? ;; true if the patch is at the intersection of two roads& O7 b. R; D! A/ j4 B; U
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
% Z; C4 I/ E* v- |! {7 P ;; false for a non-intersection patches.2 l$ b) G3 ?+ B8 }( e
my-row ;; the row of the intersection counting from the upper left corner of the
0 a; k- a8 t F7 z5 ] ;; world. -1 for non-intersection patches.2 I2 }1 f$ p4 n8 G
my-column ;; the column of the intersection counting from the upper left corner of the
: i6 g6 i' g6 v( m ;; world. -1 for non-intersection patches.
4 B8 ]+ }. J4 x my-phase ;; the phase for the intersection. -1 for non-intersection patches.: x) j' W$ Z4 N1 I6 b( d
auto? ;; whether or not this intersection will switch automatically.
, T+ d7 }, v$ |, o ;; false for non-intersection patches.
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0 J8 H1 k% u. e5 F1 ^* C;;;;;;;;;;;;;;;;;;;;;;
% q, t9 P A6 i;; Setup Procedures ;;
]6 j6 O! d: ^0 \;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.7 ?7 U' ^2 \- h* J: J0 J8 o8 }
;; Create num-cars of turtles if there are enough road patches for one turtle to
H9 V- U5 V& T) X5 ~1 b7 q; M;; be created per road patch. Set up the plots.3 u5 [4 C4 H2 R
to setup4 v: O5 p9 z" Q1 @( ^. i
ca
0 E- i; C- X3 Z+ `% l setup-globals
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% x+ H6 E3 [: [# O9 v6 H ;; First we ask the patches to draw themselves and set up a few variables
7 B+ Y6 B- R/ N$ G setup-patches
7 _0 Y; j1 Q% G1 m make-current one-of intersections
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set-default-shape turtles "car"
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if (num-cars > count roads)( y: E- D9 x: u8 O: K/ g) h
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user-message (word "There are too many cars for the amount of "9 @% J, D: @7 ~) H
"road. Either increase the amount of roads "
: Q4 n% y9 O5 V "by increasing the GRID-SIZE-X or "# f' k! y% ~* Y% @
"GRID-SIZE-Y sliders, or decrease the "
* [' h2 r/ `; O' _3 Y4 ?" C "number of cars by lowering the NUMBER slider.\n"
; m" a; j' e3 }1 n2 ]0 o "The setup has stopped.")
7 Y0 Z3 V3 i( w! f+ a stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
* D `& j3 ^1 S. G/ Y* ?! X crt num-cars
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6 Y+ H: ~3 m3 B8 T setup-cars' t7 u$ E9 o) y" g! ~9 B, d
set-car-color
! J$ O6 D4 Q) z) a3 B/ V3 F record-data) l! b& I b* _/ T: X% P5 `! ~
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; m$ d! F/ I8 o6 F5 X4 [ ;; give the turtles an initial speed
; D8 f7 m# l! u6 X2 c# f/ ~ | ask turtles [ set-car-speed ]
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reset-ticks
; P4 d, R1 O4 t, P1 C0 ~end. \; J# O7 k2 j, {, G( N, c2 u* F/ ]
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;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
9 ~- B4 ^ p, |0 C n. d% j set phase 0+ v% e5 M" I1 ~0 ~- A
set num-cars-stopped 0
2 ?* b9 o B% @" ~( C8 r set grid-x-inc world-width / grid-size-x0 L: ~ L/ Y1 G4 o; \: z, ~
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 boundary6 \0 F. b2 o2 ^+ ~4 E
set acceleration 0.099" l% M T1 q- x s; `
end& c0 p5 I: h1 l1 F8 U
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,, i A @: @* _" ~6 S
;; and initialize the traffic lights to one setting* j% u$ W" ^/ g8 Z; t% Z1 Z0 X
to setup-patches
' |0 {, n- k- a- o/ I0 X/ h ;; initialize the patch-owned variables and color the patches to a base-color$ Y9 J. {: c3 Q/ a
ask patches1 ^0 A T, l9 {6 D
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set intersection? false! N' Y8 Y2 A; ~
set auto? false; ~; L" z' S8 i+ c0 H' x0 b
set green-light-up? true9 ^ z7 y% C, i1 {
set my-row -10 n! B0 O- d; v# s. D \- t9 X! K, N% u
set my-column -1$ \, |. W6 H6 u
set my-phase -1
# H+ C7 s1 n( F4 c) { set pcolor brown + 3& X- Y. {4 q6 y# n" b3 O/ K" |
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;; initialize the global variables that hold patch agentsets
/ k# a$ B9 |4 Z, c3 W set roads patches with0 T" k/ N( n2 C- S6 H1 }
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% G. l( v+ j- Z* w- r8 M% G4 J( u (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, v4 j4 g! P% a% ]: z( @ set intersections roads with- H+ v4 {4 K N( c$ W8 l
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
- K, p6 @6 [' X) E% `) r0 e3 `6 J (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 ^& h" ^% m0 V% h4 H2 [ ~
" l. e, `0 d6 y; G0 a. A& g ask roads [ set pcolor white ]% K* c% z3 |/ O1 |
setup-intersections& L9 k- v6 n' \4 m# V9 b
end
% t6 ?0 O" J( W% _. o# c$ w其中定义道路的句子,如下所示,是什么意思啊?5 G& `7 R. ]2 s$ P: L; G0 o5 k. o
set roads patches with1 a2 o5 B1 h7 A# i
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ `# \ J ~4 E (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; @7 z" D/ u/ L" B- V/ T
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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