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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。
7 l4 y# m [! o8 B4 Q' L/ }- pnetlogo自带的social science--traffic grid这一例子当中,
! h5 g: D( v$ v: Tglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
. H) o7 V) H8 T grid-y-inc ;; the amount of patches in between two roads in the y direction
2 w) [" z6 T( D acceleration ;; the constant that controls how much a car speeds up or slows down by if( [2 M( X5 j2 c! F) n Y' @- |1 t$ c8 o6 o
;; it is to accelerate or decelerate
, A9 j4 \4 c$ b3 F$ I phase ;; keeps track of the phase
# s& b( \ V: L9 } num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure8 B' q! p7 ]4 K2 U* g6 c
current-light ;; the currently selected light
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;; patch agentsets
3 t7 C3 J' F. p! r1 r4 m intersections ;; agentset containing the patches that are intersections
: a2 D& I U0 `% o+ p roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle! b ]/ ?" D$ |
up-car? ;; true if the turtle moves downwards and false if it moves to the right
) Y" w( g S& V: v wait-time ;; the amount of time since the last time a turtle has moved4 F/ q5 i' V9 I
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads& p$ b- d4 B* }. ~5 }8 h3 \; E
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
- p8 ^% E8 g4 u* f ;; false for a non-intersection patches.# y3 W, n! @2 w4 R+ h5 [
my-row ;; the row of the intersection counting from the upper left corner of the
/ e9 l* P4 X U1 C- s ;; world. -1 for non-intersection patches.
, h( [& W# b4 |, o4 \ my-column ;; the column of the intersection counting from the upper left corner of the4 Z5 J: ~+ ]+ H1 @' Z& L |
;; world. -1 for non-intersection patches.9 `0 Z& |' J; X+ e# L! }, f
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
: ?; N# C( a' r# U4 h auto? ;; whether or not this intersection will switch automatically.8 `& r9 ~, f# |( L/ g8 ~
;; false for non-intersection patches.
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5 w) \0 ]' B( K; J* E;;;;;;;;;;;;;;;;;;;;;;3 i( @6 n: U. U& A
;; Setup Procedures ;;
1 s: c: i+ x: B% ^6 x;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
: k: S- V3 Y& E4 \6 y;; Create num-cars of turtles if there are enough road patches for one turtle to
- ^8 A3 ]" C0 J6 l* i( A0 G. R- j;; be created per road patch. Set up the plots.
! G) y) r3 _* K5 j4 o% Yto setup& L5 j- ^4 a$ k
ca
' j% r7 {, k; L) Y Q: @! r' G setup-globals, o3 a3 v; }5 A/ O
" a9 b7 C w" H& j, f% Z ;; First we ask the patches to draw themselves and set up a few variables
$ O2 _- ^! E9 P1 x! \ setup-patches
9 q y6 ^- {+ T# i* F/ p make-current one-of intersections) h0 e3 _; J/ \/ Z5 t& S2 P
label-current
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9 }# N/ i* s8 j4 Y3 W: o set-default-shape turtles "car". A1 V- w* @- i+ F7 q- k$ |
& W' u$ e+ P6 x$ b1 m5 L! w+ `$ b if (num-cars > count roads)5 t- I! G, b, _8 S- L/ b! J& {- B) ?* L+ A
[
. ^) S* |( {6 x6 M* H( @* T+ x user-message (word "There are too many cars for the amount of "0 f- n2 x+ s3 w
"road. Either increase the amount of roads "6 J9 l0 T& q- G; Z
"by increasing the GRID-SIZE-X or "! f, {! r$ n, ^1 l
"GRID-SIZE-Y sliders, or decrease the "4 y( O9 W% h+ X, Z. n+ |5 [
"number of cars by lowering the NUMBER slider.\n"3 \/ ]* s' z1 ?2 A6 |
"The setup has stopped.")
! D% N4 c7 Q" t, L' M+ t- ? n H stop
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7 R9 n. b. e% X' |5 Z0 E ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color% E( a7 S3 \- W
crt num-cars
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( G" L( P- M$ U) [& {* A setup-cars
; E9 }! _2 ]& z) K; s J! @6 F3 ] set-car-color1 n2 b! J4 _" g6 t9 K* }
record-data4 V9 U. R7 ` ~- A! c* m- W
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;; give the turtles an initial speed0 ]$ K. {1 n& q, q9 |
ask turtles [ set-car-speed ]6 }& a# {' z+ E' k# P. E. u. s
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reset-ticks
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; Y e) V6 B2 k4 j/ I;; Initialize the global variables to appropriate values; D& V+ e. Y/ D
to setup-globals) \' J3 a+ Y9 {* l
set current-light nobody ;; just for now, since there are no lights yet
8 e8 G/ W6 {0 k, G set phase 0
7 Y* v) Q6 u. N set num-cars-stopped 0
6 D0 h3 Y d. I' w! [ set grid-x-inc world-width / grid-size-x
9 X; h5 k- O: {6 e2 C$ t; B! [ 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 boundary
; |+ R% b9 O8 G set acceleration 0.099% m& P7 j" X" ]. P- c$ L _
end
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( H2 {% n# L4 J;; Make the patches have appropriate colors, set up the roads and intersections agentsets,& ^+ |6 h5 i6 m+ a. Y
;; and initialize the traffic lights to one setting9 H1 J& s# Y/ {
to setup-patches! @& h- r. m0 R6 x
;; initialize the patch-owned variables and color the patches to a base-color
2 t* O+ y. F5 \# G' D! x, @- o ask patches! i5 `: s8 |/ p$ |# ?
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+ s G! H, n0 Z$ l. X/ y set intersection? false# m7 L1 E8 O; g
set auto? false
5 K! N# n8 U' t; J: M7 i set green-light-up? true" |: _. |/ h& E0 b3 v, r
set my-row -1
& T$ R' V; b1 } g. I set my-column -1
# O3 N! e: U. Z7 x8 J" V set my-phase -1
, Y8 v5 H& P0 ?! A; V, L+ @+ h; _ set pcolor brown + 3' s* n& E8 ~1 e& k/ h) l* P
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/ T# i* P T3 W5 E) z8 H& Q ;; initialize the global variables that hold patch agentsets" N+ M$ g2 T* k" |6 {* M/ @2 H( l
set roads patches with
/ {# {. z& H; `7 ?; B1 o [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 y- i( }7 @" }8 i/ H" x (floor((pycor + max-pycor) mod grid-y-inc) = 0)] S9 V$ k3 n" K$ x3 S( H
set intersections roads with
. w( C0 r" A. Y6 f- y0 ] [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
2 l2 h8 \9 e7 x% x (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( g8 j f& W9 }+ h7 |
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ask roads [ set pcolor white ], F, e0 F' l( U& n
setup-intersections8 h5 \8 R! [3 Z3 R, m; J# I. k
end
4 J1 h" u# f" J. h7 l8 O# \4 E* K其中定义道路的句子,如下所示,是什么意思啊?0 q$ u# `6 H& |/ `$ u
set roads patches with
3 I% p+ r J. R- d2 b" _" _% x [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, r% H3 E/ E$ c6 w) b: o
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ B4 W+ v4 G! j* x9 }$ N0 i& A3 Q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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