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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。
* D. l/ q& f5 F+ }) d; Rnetlogo自带的social science--traffic grid这一例子当中,
; k% J% l' g( Z( \ n& Wglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction5 r$ Z, O8 T. Y; Q2 I3 q& R
grid-y-inc ;; the amount of patches in between two roads in the y direction$ Z/ M7 F' y; B+ j
acceleration ;; the constant that controls how much a car speeds up or slows down by if
( d2 X- f1 P [" N/ j7 @9 V" O7 I ;; it is to accelerate or decelerate
' L0 L* g. B, N. q phase ;; keeps track of the phase) _1 L8 k, M- r/ T; N7 z! v6 B. c
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
0 ]# Y6 I+ p0 k8 w; T% @0 Z current-light ;; the currently selected light- D2 l& K0 c. ^. W( O2 N
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;; patch agentsets
3 v* E, G3 n9 b5 A intersections ;; agentset containing the patches that are intersections5 O) }" T! x6 M- M X$ O2 p. z
roads ;; agentset containing the patches that are roads4 O- ]9 r# [5 x
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turtles-own
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+ L9 c9 C. M/ ^( @# m speed ;; the speed of the turtle4 H. a& D7 s% I4 f% @
up-car? ;; true if the turtle moves downwards and false if it moves to the right
u/ A$ z0 {4 D- E# L wait-time ;; the amount of time since the last time a turtle has moved9 ]6 L" r* b" a$ x8 q7 d
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads
) d% Y- W: v; [5 a$ j9 J green-light-up? ;; true if the green light is above the intersection. otherwise, false.- T- C) V9 a* j% ]% D" c
;; false for a non-intersection patches.
; R' o4 K9 B7 E& v3 r* O my-row ;; the row of the intersection counting from the upper left corner of the
! x" l' I4 G2 L; ?. _ ;; world. -1 for non-intersection patches.8 ] |( {1 b6 X5 l! J1 K
my-column ;; the column of the intersection counting from the upper left corner of the9 x [' {: `# o" @6 A
;; world. -1 for non-intersection patches.
+ Z {, h- p) o( `/ D/ j6 G my-phase ;; the phase for the intersection. -1 for non-intersection patches.
' I0 M1 U$ e3 h0 c auto? ;; whether or not this intersection will switch automatically.
C& x& d* w7 W; E7 r ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
+ c0 \9 |( f" x. W: t3 V4 b+ Z& H3 N;; Setup Procedures ;;8 G! I% N$ b' `, M( N
;;;;;;;;;;;;;;;;;;;;;;
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: l8 G# a/ A8 s h( Y;; Initialize the display by giving the global and patch variables initial values.
) @0 _$ [4 `$ t5 t7 Y% L) T;; Create num-cars of turtles if there are enough road patches for one turtle to
7 K9 K( c1 ^) |0 w;; be created per road patch. Set up the plots.
3 a, M! f: M1 C( ~/ bto setup
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: P0 z" f, S1 R) }* T, j setup-globals M& z- i' P. I* b; s$ B
# s# T0 g# z( k( r9 J0 b ;; First we ask the patches to draw themselves and set up a few variables' h) H9 ]* r: X7 o/ m y
setup-patches
+ f) j8 z3 L( k/ b2 W1 ~ make-current one-of intersections4 ]0 }+ o/ t* p4 I' X; V! h
label-current
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set-default-shape turtles "car"
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
& o' p. j1 p* o/ o. e$ w" G- G "road. Either increase the amount of roads "
' V- ]7 U6 ?! w "by increasing the GRID-SIZE-X or ") N$ D, S/ h, G x$ G' G# H
"GRID-SIZE-Y sliders, or decrease the "
4 {) V" D% S3 G" W "number of cars by lowering the NUMBER slider.\n"3 G3 B' @$ p/ e, }9 n( Z/ x
"The setup has stopped.")
0 i; s4 u: w3 S7 x' C9 e5 { stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
+ W5 i7 U! X4 z7 H* X2 A2 g L9 ]8 ^ crt num-cars' e. ?) Y; _: n9 a
[
. X7 l/ ~' {, q1 \5 b& q# y setup-cars
8 r- I9 }- y8 [# T m1 g7 i set-car-color6 o F1 Z" G+ s# @
record-data
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6 q, x2 M2 Y4 P# B: s" ^ ;; give the turtles an initial speed% V0 g1 g4 b& z
ask turtles [ set-car-speed ]( U; B2 y7 |) ~7 J% L/ U* _& x
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reset-ticks& r) t% D- r+ p/ {0 U* d4 Z& [
end
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( y7 e4 A( q4 g8 t: a;; Initialize the global variables to appropriate values
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$ j0 [% F0 ~% J' L0 |; k5 r set current-light nobody ;; just for now, since there are no lights yet
9 X# W) j+ b) E+ E4 n: ^ set phase 0) q! K2 A0 j1 {( |$ Y; d- d
set num-cars-stopped 0' a+ F( J: F6 ]3 v! a3 S
set grid-x-inc world-width / grid-size-x) x8 A4 j1 W2 I- `6 ^
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* A5 Q7 \7 B- e: @- }- o# T- u* l7 b4 q
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 ]! o9 O0 {- q+ O! e+ u9 {
;; and initialize the traffic lights to one setting% H/ b1 X" U5 I* d9 Y
to setup-patches& s) k/ d! M V3 m% L9 }
;; initialize the patch-owned variables and color the patches to a base-color
f8 G' E& a" P9 k# V ask patches& y% j0 y" g. N' e" g
[
- B: \' P8 j; N1 m+ K; a8 @. L set intersection? false1 N/ x4 W7 Y& q5 J; M8 E0 `' \
set auto? false: W# e) {5 S* D
set green-light-up? true
3 p8 W8 [* q$ ? set my-row -13 M3 c) T4 n! u" N5 e
set my-column -1
9 V* w V9 k3 N0 E" Q7 i' B set my-phase -1 g/ ^' q& {' J. f9 ~
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
& n) l. Y# v" W1 F: @: C set roads patches with/ V5 j- _* H# u8 M
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 G7 f: h# H, w/ ?1 U1 o/ v
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# \8 T+ t( ^2 G/ w* Z set intersections roads with
5 d% P" [4 T+ {" W- b+ ^/ c5 _ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and+ T: R! M' U! Z3 G# @, ]# w
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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$ a, a8 W4 z0 d( r2 b ask roads [ set pcolor white ]
- B1 p& m, a; m/ }6 E+ r L setup-intersections! Y7 v1 t P3 y$ @
end
; c7 B. a: v( z/ C1 |3 S9 S其中定义道路的句子,如下所示,是什么意思啊?) {+ ~7 H$ Y- G7 s9 Q8 B
set roads patches with. w# w0 a) S0 e. u; T1 J% K* p5 [
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! h. T4 f5 A- |" o# [ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! R, G$ l* a0 F. n4 Y
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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