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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。
, ] g1 I+ H) z8 E$ `netlogo自带的social science--traffic grid这一例子当中,
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4 O7 f) E1 h- V' |$ w grid-x-inc ;; the amount of patches in between two roads in the x direction
( \/ M: s' ^5 O; c6 U" l. z grid-y-inc ;; the amount of patches in between two roads in the y direction4 E# j% ]' Z, }$ @* r
acceleration ;; the constant that controls how much a car speeds up or slows down by if# C1 p8 g- D2 ]$ v$ s6 A" U* d
;; it is to accelerate or decelerate5 S) y5 z! t( P0 ?; ~ S
phase ;; keeps track of the phase
, Q5 ~+ Y+ Q% c+ S7 B: ^2 v% q num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure4 s8 H( t9 c! ]7 ]9 D
current-light ;; the currently selected light; F+ P4 O0 u1 { {
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;; patch agentsets, P' J" z$ F |8 r
intersections ;; agentset containing the patches that are intersections
. R: q) N3 H& t+ c. m1 v roads ;; agentset containing the patches that are roads
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& V% ^! ]" f% \+ {4 A* w0 o1 q- gturtles-own
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; Z% M9 h# J& Z$ }5 }$ K9 t speed ;; the speed of the turtle
& z! {; f4 I E: Q4 x up-car? ;; true if the turtle moves downwards and false if it moves to the right" j) m6 ?6 i/ F8 C% W5 r
wait-time ;; the amount of time since the last time a turtle has moved
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( a( c- i) n! `3 z! g0 j, upatches-own
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intersection? ;; true if the patch is at the intersection of two roads
" J l z/ U: @* c6 a green-light-up? ;; true if the green light is above the intersection. otherwise, false.
0 B! \( q5 f+ [- G0 A ;; false for a non-intersection patches.# ~; d+ E3 B4 N( t+ A/ R$ c+ m0 F
my-row ;; the row of the intersection counting from the upper left corner of the
, W& N7 @& k3 D4 ^ ;; world. -1 for non-intersection patches.' r, O/ N4 ^0 ^, I) H
my-column ;; the column of the intersection counting from the upper left corner of the+ d0 ?) p7 S3 }4 \( O
;; world. -1 for non-intersection patches." U8 B, W, U6 y" j% z8 q K$ {* z
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
! k g9 G$ K X$ f' M auto? ;; whether or not this intersection will switch automatically.
0 ^5 Q5 |. E- H; T6 S$ p ;; false for non-intersection patches.
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5 k) d2 I- c' @* k" L;;;;;;;;;;;;;;;;;;;;;;! P, |/ L* A/ L+ I+ L
;; Setup Procedures ;;
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, d- p2 t1 v" [" z- ?4 `6 ~;; Initialize the display by giving the global and patch variables initial values.3 ^+ U. |. G, k! t% F
;; Create num-cars of turtles if there are enough road patches for one turtle to ?) ]- ~7 H! [, c6 m$ M4 E6 K- I1 U
;; be created per road patch. Set up the plots." e' W( g' G/ M6 ?- g4 E" ?, K
to setup
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! Z0 S4 l4 I: X; M3 E setup-globals
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9 S; g B; L6 u0 K ;; First we ask the patches to draw themselves and set up a few variables
3 G( j. e; }4 Y: h setup-patches
3 K5 }- c, s# U: Y' I7 a% _ make-current one-of intersections
j2 }2 S0 r& i- I label-current: h0 D& f5 e( A. D# s
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set-default-shape turtles "car"
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if (num-cars > count roads)8 j% \/ x( a9 J( n, z4 i1 i0 a
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/ t6 o. x1 i) N8 `3 t user-message (word "There are too many cars for the amount of "* M- V d8 x9 x
"road. Either increase the amount of roads "+ \5 B4 |1 M% m9 D, p7 i3 G
"by increasing the GRID-SIZE-X or "
3 |; n9 z7 j2 Z; n "GRID-SIZE-Y sliders, or decrease the "
! E+ x% ^! @9 t5 ^0 F "number of cars by lowering the NUMBER slider.\n"
2 v _- ^4 c O7 w$ d7 L5 ?: d "The setup has stopped."), W, z* f. l i" ^
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
6 S, m! [# H6 e# b+ Q crt num-cars
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5 A* D1 |) V! u setup-cars
0 v [9 }' w1 b$ I! }$ o5 }* A set-car-color
1 |$ |9 t- w/ A' C6 }: F record-data& Q- N9 [9 S9 j
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;; give the turtles an initial speed' N$ N2 Y( u2 s4 N Y* [) e) n- s
ask turtles [ set-car-speed ]: b2 j: B" L: k' S2 r3 d
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reset-ticks
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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
0 v8 N8 W2 Q @8 n set phase 08 w- |- `* w& }
set num-cars-stopped 0
( E8 i4 Q: `* k8 B& L set grid-x-inc world-width / grid-size-x
+ t9 P5 I" E" o' j set grid-y-inc world-height / grid-size-y0 R" p2 g2 v* F# ^2 x. m4 N* r
3 I- M, E& i" d& d/ V# k* W ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! v6 {1 K" l3 {; V set acceleration 0.099- x: F6 V) T+ S; T# F
end$ x% s' k* w- n) A$ D/ _
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
3 G6 ?! T- z; l$ b+ ]! a6 B7 X;; and initialize the traffic lights to one setting2 e( v& n2 K, K: v
to setup-patches$ U8 @( L: B% d
;; initialize the patch-owned variables and color the patches to a base-color
( x9 V2 `9 o4 y ask patches
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set intersection? false5 j3 K5 q/ k( e' R F
set auto? false
* ^# I' v" d$ Q8 N set green-light-up? true& y# D/ l- }2 j" W; }; U
set my-row -19 z+ [8 a' B, `' _1 N( | Y1 A
set my-column -18 D" G" e6 E. Y3 M7 p
set my-phase -1
* f9 W' s* U* m, B: c0 b set pcolor brown + 31 l+ V3 I5 Y% `# X% E9 H* _
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;; initialize the global variables that hold patch agentsets
9 K. H; n/ P, a+ @) z6 l set roads patches with
0 l1 I, y% Z1 ?6 B0 h/ s4 ~ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% @( V, U4 A1 s B9 C
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 l. e6 r t0 p' p+ U# ~7 Y5 e( q
set intersections roads with5 O$ m$ R9 c+ ]# f' T. x- [. V
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and- L( j) ^6 ?; ]1 @3 x( a. ?# ~7 j
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 X( \. v \: u, q( ^
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ask roads [ set pcolor white ]
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end
$ C L3 ^! r3 D. X" s6 W: j' {) @其中定义道路的句子,如下所示,是什么意思啊?4 X5 [/ ]; F" z) f0 ]# w8 D
set roads patches with* }4 F+ c6 p a% Z' U5 K
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) b6 t8 I B( H$ ~
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]- v7 p$ U" G2 a
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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