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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。
: j6 B7 v5 I E2 T: T* H7 Unetlogo自带的social science--traffic grid这一例子当中,
9 {; j) n# Z, r% Oglobals
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4 e3 g' d% p5 w" H grid-x-inc ;; the amount of patches in between two roads in the x direction
0 `/ y1 _7 M v9 a& D' Z grid-y-inc ;; the amount of patches in between two roads in the y direction
4 U# U+ A( M) P& L! g: {8 `, U, O; m acceleration ;; the constant that controls how much a car speeds up or slows down by if
6 [, h( W2 Q, n3 u: g ;; it is to accelerate or decelerate( g. u6 P$ ~1 v. {, H0 v
phase ;; keeps track of the phase
R, P; e7 V3 V; w6 D num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure3 z1 Y: A B3 B
current-light ;; the currently selected light
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* x% F( f5 m. e ;; patch agentsets2 w6 t# s5 o7 o$ }0 e5 f
intersections ;; agentset containing the patches that are intersections
& N! P; |7 v" T% A roads ;; agentset containing the patches that are roads# A t0 f5 B' }( y2 _1 ]
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turtles-own
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, h4 T! Z. S' ?$ f speed ;; the speed of the turtle9 P9 h5 f+ K8 K8 X
up-car? ;; true if the turtle moves downwards and false if it moves to the right
# t( X0 U/ Q; f, r4 z0 K wait-time ;; the amount of time since the last time a turtle has moved; D& @4 f3 f7 F' H+ w+ H% n- N+ _
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, o3 n y) y4 {. P# ipatches-own
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intersection? ;; true if the patch is at the intersection of two roads
. T$ V- x8 E3 b& B# p6 p green-light-up? ;; true if the green light is above the intersection. otherwise, false.
" X1 F f' Y8 U7 _0 Y- ]8 | ;; false for a non-intersection patches.
$ B, L$ `1 L% y7 A8 c! r# C my-row ;; the row of the intersection counting from the upper left corner of the
8 C$ U3 O. O. k3 P/ `. h ;; world. -1 for non-intersection patches.
6 ~# e! `! ]% c' n; k6 v$ u+ u" R my-column ;; the column of the intersection counting from the upper left corner of the
) n9 m9 \" U% ~. S, n ;; world. -1 for non-intersection patches.7 t( @( g; ]" N2 I# x& \
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
+ O. c( x; y" o3 ^) Y8 \! k auto? ;; whether or not this intersection will switch automatically.
8 @, d {$ x3 ^" Z ;; false for non-intersection patches.
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( R0 Z! C3 V' ^0 t; A;;;;;;;;;;;;;;;;;;;;;;
( P7 X$ y; D. f4 }1 F, h9 i1 N;; Setup Procedures ;;
( }7 O* U1 j% z;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
: g0 n3 X ~/ }8 z! v;; Create num-cars of turtles if there are enough road patches for one turtle to o; c" I) {. S
;; be created per road patch. Set up the plots.) R$ V3 C& w9 r8 M, Y4 R. w
to setup
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setup-globals& m3 Z1 N7 ~8 a B& m
' ~6 q9 R$ r; S2 r S" U/ q ;; First we ask the patches to draw themselves and set up a few variables. c8 h" k$ m$ H) `+ J7 J
setup-patches% I8 Y) ~0 S0 k' A
make-current one-of intersections- d# p$ d- \! e3 a" }3 \$ \
label-current, b6 C, o. o" f( f
* n: I" p% q% g+ _8 U* M0 z set-default-shape turtles "car"
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/ N0 ^# b8 _* p) c" [' s. ` if (num-cars > count roads)
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* D+ z6 W* h3 ^" q* E; x- _ user-message (word "There are too many cars for the amount of "
7 `% O$ q9 f7 J/ q "road. Either increase the amount of roads "
2 L* j9 y0 {& I6 _: j2 f( S "by increasing the GRID-SIZE-X or "
" U' U2 ]7 ]7 R+ _- |( @ "GRID-SIZE-Y sliders, or decrease the "
- A( {( Q) e, f3 c& E "number of cars by lowering the NUMBER slider.\n"
% j5 p) H8 v: m "The setup has stopped.")& f* M( ^; U% C
stop2 [3 ~& s3 D/ M- |7 y1 V; l
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color3 `9 N3 X3 p0 q; F6 v: H
crt num-cars
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" i( Q, U+ @ S; F" o; c+ V setup-cars) U6 ]3 \9 G: r0 g( U0 o% h: R
set-car-color( m# C/ {) L! {) S! \
record-data
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; _5 k4 r$ A5 A) u# n. K; U ;; give the turtles an initial speed3 Z9 J+ k" ?, D$ _: d, t4 h$ b: ~
ask turtles [ set-car-speed ]
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reset-ticks
4 w& q4 [. ]5 wend
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;; Initialize the global variables to appropriate values
6 M) K: S0 F" x" f+ k( |to setup-globals8 K: s$ S: J+ {: @% w/ l0 ]2 K
set current-light nobody ;; just for now, since there are no lights yet+ Q' a0 v& ]- G& g/ \4 o
set phase 0
( F2 |* v E7 \0 x9 ]) T set num-cars-stopped 0& m, Z2 v% X1 i! x+ q
set grid-x-inc world-width / grid-size-x
) ]/ o7 F1 f N$ z set grid-y-inc world-height / grid-size-y- `2 l f8 H+ T1 c' L* j
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary' z6 A7 \1 S6 @
set acceleration 0.099
3 u" k5 m( y/ Nend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
' J7 w4 L3 M* z;; and initialize the traffic lights to one setting3 I2 ?1 m+ J+ t% v9 U, N
to setup-patches
6 n |. G) {1 ?; D- ]* P2 N8 |) r" E' k ;; initialize the patch-owned variables and color the patches to a base-color
2 g" p o' b- d3 w6 A ask patches" z) J5 u9 n) o
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set intersection? false
) f n: P( J/ \8 v set auto? false! I2 X9 h- G5 U+ m3 W( |4 Q5 O7 L
set green-light-up? true$ }/ q9 ]) I) H0 Z
set my-row -1- ]- C4 B1 Q3 ^
set my-column -1
& ^; O- J, j: y( p u4 m' j/ v; k" R7 e set my-phase -1
7 ]3 V) Y) c. } set pcolor brown + 3) f) t8 x- x9 K) h
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a* i2 S. _. i1 ?- V4 T( A ;; initialize the global variables that hold patch agentsets* k- o9 ]+ W1 o; S% }- U! p t2 P
set roads patches with
' y, r& j4 b8 G3 L5 D" D. q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" S1 I% g+ _1 j/ g
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 f/ N; _- B/ p$ k
set intersections roads with
2 P; {; s3 [4 l: w& U$ t6 D; r [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and( ?! J6 Z6 ]4 M1 w4 H
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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end
4 y# ^$ m" k# r' W4 x) G其中定义道路的句子,如下所示,是什么意思啊?
6 c" Q9 M# m0 H' G) \# O set roads patches with6 o! z: |8 c! R. e# f& E; c
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, L0 h9 W" w2 t A" I+ v g2 {
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 `, \, X6 S" _
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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