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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。
u5 R1 g0 m0 X1 y: |1 A' `4 Rnetlogo自带的social science--traffic grid这一例子当中,9 r- x5 V7 r' y, l6 i/ v% ~4 ~$ K- m
globals
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& ` Q/ i# \) }2 L1 o7 E: V) ~7 z+ t: Z grid-x-inc ;; the amount of patches in between two roads in the x direction
( z! z1 R# h; r$ P/ V grid-y-inc ;; the amount of patches in between two roads in the y direction
* D: G. y& v+ W) g l1 K acceleration ;; the constant that controls how much a car speeds up or slows down by if7 w; }- d5 m6 e$ ^/ ]
;; it is to accelerate or decelerate
8 a! ]; O& r3 u% J, S7 o phase ;; keeps track of the phase
9 K3 i5 p; M% o( t( m- Y* ~ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure2 ~; d, r r3 D# t2 _( D# K
current-light ;; the currently selected light5 I4 {# d: i0 g- C+ e$ ~- E( c
4 @ M+ o$ j$ [1 |. a! B ;; patch agentsets5 U+ m" F n- m" P; b5 O
intersections ;; agentset containing the patches that are intersections' E* X% p$ C3 F5 p! N5 Q
roads ;; agentset containing the patches that are roads$ d# _! v. [" {* s: C+ b, M
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turtles-own5 Y2 n' E5 q8 \) p+ f3 y, P
[
# B$ J* Z& p/ P; E6 z speed ;; the speed of the turtle
5 ^" H8 T7 f3 X4 N: o up-car? ;; true if the turtle moves downwards and false if it moves to the right1 s% f% f, d* c1 g9 W
wait-time ;; the amount of time since the last time a turtle has moved
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* Z2 k: i" N* m* J9 \patches-own2 a* ?) w, v5 _. j; r& S
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intersection? ;; true if the patch is at the intersection of two roads9 @7 m. T) A0 ]: K4 y" Z1 ^+ V% S
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
) U6 ~9 c- m5 F4 @7 O) x ;; false for a non-intersection patches.
' v: v( g9 }7 n4 k! s. Y my-row ;; the row of the intersection counting from the upper left corner of the
* O2 F+ c) G; f* a+ n4 c# U8 V' }: A ;; world. -1 for non-intersection patches.0 z: ?* C2 ~1 A3 F
my-column ;; the column of the intersection counting from the upper left corner of the
/ s. p" w I$ n% o; k) Z ;; world. -1 for non-intersection patches.3 I+ \& C$ M8 N: F: b1 g' X! |
my-phase ;; the phase for the intersection. -1 for non-intersection patches.- }, O* o( L6 C4 [/ }$ h F
auto? ;; whether or not this intersection will switch automatically.
( Z4 d6 ~3 o Q% n g: S ;; false for non-intersection patches.
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* `9 `" a4 H6 d$ b;;;;;;;;;;;;;;;;;;;;;;+ D% E: n) m/ q( i8 r+ \5 A
;; Setup Procedures ;;3 O5 i! M* q% D6 {9 h( g2 {9 `" C
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
7 g5 h) h& f- x( @; f;; Create num-cars of turtles if there are enough road patches for one turtle to
; d3 R7 G8 _7 j2 T;; be created per road patch. Set up the plots.- V7 D8 }8 Z% Y6 P& g
to setup. M) W/ Q# }) P' t
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setup-globals
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i ?) E4 B5 f' \. m ;; First we ask the patches to draw themselves and set up a few variables0 J& l$ B( a e- {
setup-patches k6 L; Z, C x. h
make-current one-of intersections; v) _; R8 O8 b
label-current7 g" ?$ F0 L- A! K
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set-default-shape turtles "car"
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if (num-cars > count roads)
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1 c: N" o5 t1 g7 v/ s# |7 G user-message (word "There are too many cars for the amount of "
, Q; r- T. ~- D% w6 j4 i "road. Either increase the amount of roads "
1 B/ k$ a& r# W* I1 r) Z7 ` "by increasing the GRID-SIZE-X or "' Y( ]4 @+ k0 x- [. _! _3 N
"GRID-SIZE-Y sliders, or decrease the "! p k5 h- r. M) s7 {: o0 T% L& Z& d
"number of cars by lowering the NUMBER slider.\n"3 G, n" x! J# |8 v: D# r$ z6 ^2 Y
"The setup has stopped.")
4 L5 H- w {$ `: c! o stop: ?/ @6 P. k0 V) O$ l
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
: Y% E. J5 n$ g& K, ~ crt num-cars
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% X; q3 \( S2 D9 q+ k9 e setup-cars5 G% T6 }& Q1 D3 v3 e: T
set-car-color
0 F5 P; f! I/ g$ E) c/ Y* K2 H- u record-data; a, u" d& d' p) G! b# U- t' B0 S
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;; give the turtles an initial speed T, E# s1 ~0 C S. v( Q+ O# o! _
ask turtles [ set-car-speed ]) d6 V/ K2 r! \1 z" K
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reset-ticks3 r" O( N& i, U- ~2 ]% U
end) S! c* \2 V9 W Q! _
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;; Initialize the global variables to appropriate values
' L# N7 v3 B. y0 o& v# ^to setup-globals
6 B4 `: e7 p; ^/ _4 l. A set current-light nobody ;; just for now, since there are no lights yet
! S# v: f( ~2 _, y7 \/ | set phase 07 M+ d; A! O0 E( [
set num-cars-stopped 0" m+ |( P* X+ P) {1 {" y( P
set grid-x-inc world-width / grid-size-x, E$ C/ t8 w* w: b/ h% F2 J
set grid-y-inc world-height / grid-size-y
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! Q4 u5 ?: j- ^1 M# i8 ]! ~ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary5 z( R% u: b) t8 D
set acceleration 0.0997 V0 G& W& ]9 k _8 X* E
end/ k9 B( d# G! W$ e2 m" ~
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
, F- u' _3 D7 i2 x" {4 K- ?;; and initialize the traffic lights to one setting
0 `2 {( i3 @) L' w1 R% T0 uto setup-patches4 G- a' r& R T( R; _
;; initialize the patch-owned variables and color the patches to a base-color
1 R6 E! U; J& K3 f$ t1 G4 k* Y2 Q! k* G ask patches
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7 R8 b/ }3 P& |3 J# c2 y set intersection? false
* I0 d: j2 Y4 g/ R R. O5 p7 N8 s* T set auto? false
: G$ ? {* s# u* `% O set green-light-up? true) S/ ?+ d9 x' b& a6 H
set my-row -1; l5 x. |7 k, X ^/ X! r
set my-column -1
. F/ N$ B2 J. y# U0 t* I set my-phase -18 K9 E. }, N% V: N
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets p- |6 p! Y1 p* j" f' @
set roads patches with4 a8 J" T+ ?' q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
q( g5 e/ c" F# A/ v$ y% I (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 }5 B: f! V* C4 ]- A& \ set intersections roads with
8 E' l0 ]+ v& q5 H/ _4 U [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and6 F7 z/ p$ F# [5 n3 M% ^' M
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]7 l7 h# \8 A$ f% r5 Y! n
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?/ m+ c. x5 p( D o8 ]" y
set roads patches with( J- k/ `) P3 S
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 r& s! J9 e3 C3 ^0 O, g (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" U) e/ h; y& R7 C+ R& @- Q8 h4 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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