|
|
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。 _/ L) l3 D& t+ N7 e3 z
netlogo自带的social science--traffic grid这一例子当中,; y# b* V( A* }' f! A6 m. \
globals- a- p% B, S$ f {% B6 F* n
[
$ s2 M) H+ W9 L4 Z! ]; w grid-x-inc ;; the amount of patches in between two roads in the x direction8 P: E6 j7 k _7 k1 D0 U# [
grid-y-inc ;; the amount of patches in between two roads in the y direction
0 p& ^: |5 F9 {/ R5 P! ^0 ]0 g$ P8 l acceleration ;; the constant that controls how much a car speeds up or slows down by if
$ H& ^' S) M# U2 V. D p ;; it is to accelerate or decelerate
0 x: N. @1 [5 I% k5 |% j: A7 ~! R8 b phase ;; keeps track of the phase& z6 j% W' t2 q1 g p
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure+ O$ Z }- f, x
current-light ;; the currently selected light( r6 |( s/ R+ u
0 L6 a' x- @' w5 F7 ` ;; patch agentsets0 T/ J7 [$ ?* G3 K- _
intersections ;; agentset containing the patches that are intersections; B: Y% N& \3 _! Y; }
roads ;; agentset containing the patches that are roads
, M- C# f) J$ j0 o]5 s& I8 a3 n1 Q# v2 o) K
% k6 B+ l* L( ~6 i7 R4 V% ~turtles-own5 G6 Z7 b& J% S+ e6 }0 r* t' w
[" D5 J h6 r# W* q7 i- u& @5 s
speed ;; the speed of the turtle# u5 v3 K; L' h. @4 Y! J3 a
up-car? ;; true if the turtle moves downwards and false if it moves to the right
% J3 \* @/ l' u; ^- @. L4 |5 ` wait-time ;; the amount of time since the last time a turtle has moved
. U& o( N- b7 D4 M] ^) m/ a3 } h- z7 R3 v4 @
' B) g( S2 l5 L5 Hpatches-own
- w7 c! y- s9 O/ Y9 ], u4 E* @[
+ W: N0 P- s! q intersection? ;; true if the patch is at the intersection of two roads
' x1 |$ `8 W% {, U* D green-light-up? ;; true if the green light is above the intersection. otherwise, false.
4 v" l, S" i: @: W, Y- G1 V+ n ;; false for a non-intersection patches.
. X7 _7 D) `1 W7 W. z! W5 R6 U1 V my-row ;; the row of the intersection counting from the upper left corner of the w- ?7 X2 W& Z3 M- ]) u7 y
;; world. -1 for non-intersection patches.5 H: L/ b- C1 p0 A& d* H5 E- E0 X
my-column ;; the column of the intersection counting from the upper left corner of the/ g* |& V# S6 U" N. L& B6 V
;; world. -1 for non-intersection patches.
* y6 ?2 C7 K8 N1 V my-phase ;; the phase for the intersection. -1 for non-intersection patches.
/ l2 e$ F! Q/ @. U- l9 T auto? ;; whether or not this intersection will switch automatically.
# Z2 R/ J1 {9 Z& O* {% K ;; false for non-intersection patches.
# e% D7 q9 m! {$ Z]2 x; E4 z \6 h8 B
, q+ S3 j- G7 B5 ~" j
) l: T- ]* j' x. p$ \;;;;;;;;;;;;;;;;;;;;;;
4 I6 e& m+ O1 O0 y/ w& l$ j;; Setup Procedures ;;
4 e# x% B% l2 ?/ ^0 J' \;;;;;;;;;;;;;;;;;;;;;;
3 P/ n. ?; i. `% C3 ?: y P W8 Z5 s$ M3 N3 i8 B. t. b4 D& c' Y
;; Initialize the display by giving the global and patch variables initial values.
6 G" ?* K; U, a5 N2 f, h& T;; Create num-cars of turtles if there are enough road patches for one turtle to, Q1 X0 A6 P) H9 u7 t' |- ]
;; be created per road patch. Set up the plots.& B- a4 ~2 {, L- p- s% {2 a* J
to setup
6 T; u. r9 \: \ D" I$ Z ca2 k; F g) U" y4 y
setup-globals
I$ K1 ]9 H2 m0 m6 \& O# E* P1 M; M8 z* E9 C
;; First we ask the patches to draw themselves and set up a few variables
6 x9 S( F/ p, ~& h" } setup-patches( T* F) c1 C/ b& |2 R
make-current one-of intersections/ M6 N. L& k/ i8 n1 y. Y
label-current( t# E5 a+ b0 I4 P9 K
& [' |* J4 e- u. `+ { H set-default-shape turtles "car"$ R! y: i# H3 [. L5 F# S" Q
O. l% [8 S$ Z, h6 t if (num-cars > count roads)
+ o) e* \8 ?3 F+ d; @, G [
, x4 o+ H! G* v6 R# Q6 z6 a0 v user-message (word "There are too many cars for the amount of "
% i( l% B9 w# u( R% z+ v9 z "road. Either increase the amount of roads "
% a0 c" A- p( Z7 x "by increasing the GRID-SIZE-X or "
: W9 p6 V8 m/ { "GRID-SIZE-Y sliders, or decrease the "
% K* o7 B, b$ \" o3 E& ~/ q "number of cars by lowering the NUMBER slider.\n"$ L* U _+ _$ H, q# X# J
"The setup has stopped.")
) O% S& \- d8 t stop9 V$ N% \4 Z: L& t( u' d# k& r0 v
]# ?) Q2 T7 x4 |' f3 }- L
. P, q# W$ P- t8 P A& Y
;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color% d U! h% u0 @: J( L+ e
crt num-cars
! b/ I4 \* x: u. ^ [( Y0 F! ]. H; Q
setup-cars0 Q9 g1 P4 g( w0 I7 O8 Z
set-car-color
/ ~, ^; L8 p- i7 D& _ record-data2 V6 Y! W ~. n
]
4 K3 R5 x F X5 r
4 }4 _/ s6 ^' N3 v- j6 ~ ;; give the turtles an initial speed
4 Y4 d; q, O9 K2 ~! o' N ask turtles [ set-car-speed ]
% T, d: A( E, b6 M7 W( p, J; a. `- _7 Q" X) X& r c: b- z) e
reset-ticks$ R) Y( W8 j7 \! u6 |
end
4 j, T( @' z+ p- I* ^ E- U8 T( t" E/ F6 J: c: f
;; Initialize the global variables to appropriate values
4 ]* L/ P' Z4 F) @to setup-globals
: E) p0 E9 ]* I# K" `# d set current-light nobody ;; just for now, since there are no lights yet
" P1 l% o' p4 b7 l% y% ] set phase 0' O& N# R; [+ v- e. E9 W
set num-cars-stopped 0
+ c( r% x9 b8 A9 |) z+ R; ^# } set grid-x-inc world-width / grid-size-x
5 M6 N2 U' b0 M b4 Q& A) Y set grid-y-inc world-height / grid-size-y0 J0 A o8 T! m, U
6 `: Z. M' @/ A ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
% g' i! v/ F, `) p( Y' h) v set acceleration 0.099
# x5 ?- A! e6 n+ Z; gend/ v+ N( ?5 n5 {; h
6 Y" E* S! o% b
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
/ H \" K: i+ B3 i7 t) g$ b;; and initialize the traffic lights to one setting
3 p5 z5 d/ [, s. u+ D1 \to setup-patches. I& W3 {( P5 {2 k9 v# w/ M( ]3 |
;; initialize the patch-owned variables and color the patches to a base-color
( Z/ ?) \, e) Z5 A ask patches
" k* {# r4 N8 k [
' L" q& A1 ^; f4 ] set intersection? false) M: u8 I0 w3 ]
set auto? false- ]: }1 l( t( w: @
set green-light-up? true
, K/ t2 Y8 m7 e: ~$ H1 Y \" N set my-row -1
, C4 p2 j0 |$ s/ x* S+ `; |1 X" a9 X# O set my-column -1# I0 u6 `8 S, S
set my-phase -1
5 s8 e3 b& R2 ~8 a2 O' J5 Y set pcolor brown + 3
) _2 O, G% ?6 Q7 o$ x% n) m ]
/ j5 ?8 f: H9 t+ a( U( b0 T$ D6 z5 {
;; initialize the global variables that hold patch agentsets |% N. P- e) }, p
set roads patches with
1 h' n! V1 u b8 ^7 _! w& j [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' z1 X, N: a& a8 g# i. Y, c3 s (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- B$ V9 t. v; L) t: V9 M
set intersections roads with T w ~( K/ p7 ]1 h2 c3 M
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
7 Y7 q- c4 S9 g, G2 C (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: V* r6 Y9 L w( ]3 ?/ X$ G" d& P9 c
7 F! ?+ z# t: O' X( w
ask roads [ set pcolor white ]
$ b- R5 s8 w1 y* @) ]4 ^" q; F$ B setup-intersections( M/ w( M% A8 b& N8 |- I
end
9 O& ?/ A* A4 v% _, y其中定义道路的句子,如下所示,是什么意思啊?7 _0 ^6 D9 M$ l; y* k
set roads patches with+ l% h0 Q% {8 n3 l/ {4 d& y: u( a
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 X6 i. N* h' Z( M6 B+ M5 w" ~ (floor((pycor + max-pycor) mod grid-y-inc) = 0)], R4 N F) q# J# F/ c1 ]
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? |
|