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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。
- t' k+ i; ~* \% O' ?. @$ unetlogo自带的social science--traffic grid这一例子当中,
7 W4 O( L; d# Y: Wglobals& C+ s: m3 S; A4 L
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grid-x-inc ;; the amount of patches in between two roads in the x direction+ O/ t1 {, x& n" @
grid-y-inc ;; the amount of patches in between two roads in the y direction% ]% T( _4 }% \$ g6 E& K% T
acceleration ;; the constant that controls how much a car speeds up or slows down by if: z8 `+ j# Q3 f# \4 F8 d M
;; it is to accelerate or decelerate: {6 P6 c" X; h, ]0 Q/ K- y
phase ;; keeps track of the phase" ]4 _- X( m1 H& l$ L; G
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure0 p1 X- ]4 d; }- M* Y
current-light ;; the currently selected light P5 C3 m" D3 j# t! A3 `
8 R3 K7 {8 n% m) { ;; patch agentsets
1 O7 W8 N7 y9 a# C0 b; O% ?: P intersections ;; agentset containing the patches that are intersections
. y1 Z' Q* g% y0 O0 j& N4 b roads ;; agentset containing the patches that are roads
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turtles-own2 Y9 D1 m- E0 Z! W2 m& a7 d: Y
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( o0 f: Y! z- |, [! A( } speed ;; the speed of the turtle. [8 S( b* b1 _' P5 P; ?
up-car? ;; true if the turtle moves downwards and false if it moves to the right; U. C: h4 x7 Q$ \* ^
wait-time ;; the amount of time since the last time a turtle has moved
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7 _3 T& K+ K( Wpatches-own# N/ z. ?* x+ O& D3 f3 g3 b
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( _9 s3 W! h8 V: u% F! X5 b intersection? ;; true if the patch is at the intersection of two roads
) h$ K. q% l% N# w" q5 v. ] green-light-up? ;; true if the green light is above the intersection. otherwise, false.
# r* p1 \. ?9 [3 g ;; false for a non-intersection patches.2 P. K4 j( ?4 ^* U
my-row ;; the row of the intersection counting from the upper left corner of the
3 N" y& R! V% c$ o" t$ ^ ;; world. -1 for non-intersection patches.
; L' O! e3 a- x my-column ;; the column of the intersection counting from the upper left corner of the7 t* A- _. {$ i
;; world. -1 for non-intersection patches.
. P; f, J3 ?! K* d% d; E% }. I my-phase ;; the phase for the intersection. -1 for non-intersection patches.
' l V* C G6 Q7 \ auto? ;; whether or not this intersection will switch automatically.: d+ J i* I2 r3 [ F3 o0 m
;; false for non-intersection patches.# r" [5 v% m0 V2 k; A! l
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;;;;;;;;;;;;;;;;;;;;;;
& F: a) J, `; m9 o9 q5 G# i* [! B3 r;; Setup Procedures ;;- \0 S* |: o9 p) L. O
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; S2 V& I* ]- h$ t" |;; Initialize the display by giving the global and patch variables initial values.7 c* S& q/ j' f8 Y& \1 G) f' _
;; Create num-cars of turtles if there are enough road patches for one turtle to/ \0 |+ ]3 R' D) J8 P
;; be created per road patch. Set up the plots.. ^- X* H8 P0 U7 ]
to setup
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setup-globals3 K* f; C& Z8 w+ w
+ m) D/ M+ N) s3 M, U ;; First we ask the patches to draw themselves and set up a few variables
4 Z6 q- M( H+ t0 e% _3 k$ P- j$ I setup-patches3 y& p* F7 z; O# e2 E q! B
make-current one-of intersections( O0 \- m! R- N! I6 N
label-current7 `' w8 P. {4 S1 k7 }, m- t9 @
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set-default-shape turtles "car": n/ q# ~8 S: T' I6 L
& g6 q9 Z G. M" o if (num-cars > count roads)$ Z2 a0 @* m0 @, x
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user-message (word "There are too many cars for the amount of "
9 G/ H/ {3 _; X/ t- \5 P# L$ Z "road. Either increase the amount of roads "
8 [( X6 w- ?% X6 T4 d, O "by increasing the GRID-SIZE-X or "
- C: O6 i, c9 C# d7 i2 y- i4 Z "GRID-SIZE-Y sliders, or decrease the "
# F2 U5 o" T& |- Y% m3 d; A! R "number of cars by lowering the NUMBER slider.\n"
) o( b5 U. p& G7 k# d. A% {: z9 t# j "The setup has stopped.")7 x/ w/ Q+ ]! F+ t8 {' T; X6 ^
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
" G; ^* u! x) a4 D' R. m. X crt num-cars
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8 T4 F' y+ L" F; w' p setup-cars, k0 j" d0 S* Q9 j) W
set-car-color
4 s& |/ M4 ~% K; n6 d& k, r4 J record-data/ [0 ^( }0 K5 n1 Y- t, I/ D
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# x7 w- p/ Y+ R- K, Y4 P3 e ;; give the turtles an initial speed" R. t& z; |/ b+ Q( K/ ?* _7 t# `
ask turtles [ set-car-speed ]! I' k3 v# h' F4 y
& t. @8 C) i# k, Z+ Q8 D3 f2 K1 G reset-ticks" N8 ^7 z8 `3 P* Y7 c
end! Z; l$ E. L8 e; N7 M; p3 d- }
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;; Initialize the global variables to appropriate values2 x0 x4 o! `5 t8 e' {- i( b3 A
to setup-globals* H4 X' v3 V* ]! q$ p0 r' q
set current-light nobody ;; just for now, since there are no lights yet
R! {) W" ]/ ` set phase 0' @$ ?( p' z2 f: K& {5 N- L
set num-cars-stopped 0
2 r7 l. W+ e l; L6 F set grid-x-inc world-width / grid-size-x, b7 F# u4 K: s J
set grid-y-inc world-height / grid-size-y4 x5 C6 f/ N4 F$ X( X0 k; x" W. [
8 E7 ]3 s3 \' }0 F5 X& e ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary2 X) E$ a) W, W+ C; N0 b" J
set acceleration 0.099' r. V7 v/ z' w, C/ ^; ]0 z8 I
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
& o7 v0 P/ @5 X;; and initialize the traffic lights to one setting
+ h3 E4 J; y% w" b- W" p, qto setup-patches1 p* G7 i% a0 \, ~+ G; ^6 z
;; initialize the patch-owned variables and color the patches to a base-color+ u/ G9 `( `- g4 S, l6 A
ask patches
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set intersection? false
8 h; l2 [, }" V4 @+ i set auto? false
h6 ~, v4 m6 W. c. v0 ]6 ]6 t set green-light-up? true
- g5 t$ ?+ c1 X# s3 V. t1 q set my-row -1
* e2 ~& X b; y- D" b2 ~ u set my-column -1+ P& U/ O" Q* s0 }4 s6 z* i
set my-phase -1, U* Q+ z1 o! ]3 l
set pcolor brown + 3$ c" u) m- }; p" N w
]
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;; initialize the global variables that hold patch agentsets
5 c; P) f) T2 d$ h set roads patches with/ l- K/ _; S/ E \" g
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' S }, @% A9 I6 B
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 J* q/ T; ]; M3 G1 u# l
set intersections roads with
2 \- v- q% ~; c+ R {5 ?4 ~ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and7 W$ i' T. X6 {- e X2 N: j( Z& ^( }
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ G0 g) Q, l3 O" N- f% {
- |( u, t- v& L/ J8 M ask roads [ set pcolor white ]
3 d( P, P3 O# E0 X8 J& l% [ setup-intersections
# c) ~# I% z2 B5 Lend
8 T; [8 q/ r7 T8 N# X, B其中定义道路的句子,如下所示,是什么意思啊?8 ~$ E, ?, V+ u2 q" g9 V
set roads patches with
/ C5 `' }1 K+ b, D [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 s. r) c7 g+ }1 f8 A. a (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" n. y, g# |5 F1 C% x8 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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