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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。% f3 H: n/ b% \" G' B1 h1 m' S
netlogo自带的social science--traffic grid这一例子当中,
& |8 j9 h8 `+ cglobals! M, |3 y4 r3 K# {
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1 [( [) J# @4 I B% ^ grid-x-inc ;; the amount of patches in between two roads in the x direction
* }% j7 M9 J4 A( | grid-y-inc ;; the amount of patches in between two roads in the y direction
- y% |2 W/ ^$ m0 w acceleration ;; the constant that controls how much a car speeds up or slows down by if1 G* W1 s. \. y+ e0 X8 D/ F) g: q
;; it is to accelerate or decelerate
0 T1 C0 d: X' f' F( ]' ]( J o! C* F phase ;; keeps track of the phase
+ w0 G- @, p0 _! k6 v( o num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
# X/ E& c: T) M) M4 e7 } ?" m, @" S+ M current-light ;; the currently selected light' A: F' G G6 J% f: Q
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;; patch agentsets G! ]% u. O- ]$ m
intersections ;; agentset containing the patches that are intersections7 Q) x J; n& [; g! Q% M; Y) z
roads ;; agentset containing the patches that are roads
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0 F) D& H8 a% {8 p/ j/ i& zturtles-own/ p4 e) D0 P" m3 O. e2 z5 Q
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speed ;; the speed of the turtle; K B" a; y7 w4 [
up-car? ;; true if the turtle moves downwards and false if it moves to the right
* ~/ i* i1 w) { wait-time ;; the amount of time since the last time a turtle has moved5 ?1 W- F; |" }/ S K/ D4 F( Z- ]- [
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patches-own! v. N, H9 {6 }2 S2 m
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intersection? ;; true if the patch is at the intersection of two roads
/ X% p4 Z) H( Z. W* F0 T% E green-light-up? ;; true if the green light is above the intersection. otherwise, false./ {+ T# t, \+ x
;; false for a non-intersection patches.
$ r: B# p( Y- B H6 v my-row ;; the row of the intersection counting from the upper left corner of the
! D4 Z1 c6 J- x* p. g5 V$ z ;; world. -1 for non-intersection patches.9 a# z" z/ u. |+ ~- Y/ u
my-column ;; the column of the intersection counting from the upper left corner of the; Y2 o0 y N5 ]6 q9 l7 {6 x
;; world. -1 for non-intersection patches.5 ^8 K3 H5 a9 o7 Q4 o. ~
my-phase ;; the phase for the intersection. -1 for non-intersection patches.) o1 h8 V2 F1 J4 |+ c
auto? ;; whether or not this intersection will switch automatically.9 v8 W% X1 ~3 x+ {2 B/ `, B) e9 u) b
;; false for non-intersection patches.- [9 a" |& `1 j5 R5 m* ~
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# b a8 p# w! y8 v) L;;;;;;;;;;;;;;;;;;;;;;
% F# q" x ~6 h;; Setup Procedures ;;
/ ]# o- Y" D7 L4 [7 n;;;;;;;;;;;;;;;;;;;;;;
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8 ^0 _. K2 @! t* ^3 P6 R;; Initialize the display by giving the global and patch variables initial values.4 k: j5 X* ^; O" S
;; Create num-cars of turtles if there are enough road patches for one turtle to
9 U1 I: r+ v3 } v- g# B z# y& b* p;; be created per road patch. Set up the plots.
1 |2 T3 o( s) p& d7 r# _; ^" Pto setup) [( ~# t: z z* i( d0 F6 }. G
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setup-globals4 C+ i- {* F G7 ~
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;; First we ask the patches to draw themselves and set up a few variables$ u7 H7 @; `1 J& B# O
setup-patches
4 f; u" E) M" Q2 ^; i make-current one-of intersections
) J4 f2 a! d: U( [4 S7 ?. \' U label-current
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set-default-shape turtles "car"9 B; N2 [ R7 A1 i# H* u
- ]3 m2 Z4 d' I& U) ]1 v9 @7 f if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
5 e, w+ I% n9 w, j% s+ G "road. Either increase the amount of roads "
' v# m3 l! ?4 k5 l "by increasing the GRID-SIZE-X or "
: ?0 i. j7 e- ]$ B "GRID-SIZE-Y sliders, or decrease the "& ~4 ?% H7 ]# @* x- N- }
"number of cars by lowering the NUMBER slider.\n"
, M0 e i) K6 O" t) x! h$ A "The setup has stopped."), n/ l/ E: n3 [, |9 |
stop( ]6 ~- ^* R9 V7 p
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6 T0 {* _, F; N1 e5 T ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color+ }2 _" W: K* N" T1 F
crt num-cars
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setup-cars
: z6 h6 _1 S7 A- ?9 ^ w& g set-car-color+ R/ q4 }; [' c8 B6 p
record-data8 v' \7 `7 X# Y1 {( u. n6 I: W$ X
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; e5 c I! n# C4 M1 C- Z( r ;; give the turtles an initial speed+ `: @& V' I/ f" u* b# n+ Z
ask turtles [ set-car-speed ]
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reset-ticks* {! v$ ?( E, h' C, O5 ^
end# O( [* e& C0 d6 V) v3 |5 i
1 I' `# A- M8 x7 o+ D9 T1 i;; Initialize the global variables to appropriate values
, d2 M1 S! d+ O, F. n+ hto setup-globals% p/ V' m2 t/ g% Q
set current-light nobody ;; just for now, since there are no lights yet
6 p) O( x9 t j set phase 08 L4 Z/ @5 I! @
set num-cars-stopped 0
4 m! u9 f) t, x9 l, } set grid-x-inc world-width / grid-size-x2 F3 {* w6 [6 M
set grid-y-inc world-height / grid-size-y, h8 I0 A2 ], k# q
# p8 P1 Z- P- I# ~ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
* Q% e, f* M4 {6 D' Q) [( d" m set acceleration 0.099* o3 s5 b" V/ s' H
end- a/ ]5 \- y. [- r5 }! g# y
! n0 |7 U( A) O. @* q;; Make the patches have appropriate colors, set up the roads and intersections agentsets,; S/ K6 k4 _' V: A5 W
;; and initialize the traffic lights to one setting- _) R5 Q& C6 T
to setup-patches
, i3 }7 |+ M& b: M7 o3 q9 U ;; initialize the patch-owned variables and color the patches to a base-color
3 s0 N. |8 m! P1 }! F ask patches
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* j3 v; u% A5 Y/ ^! C, ^& m set intersection? false! G# T- [1 P4 n) y5 L, N+ d4 @. ]" J' g
set auto? false
* i# a% e: s/ g6 J7 B( b, P set green-light-up? true
* W6 K2 E9 Z4 E3 i) m. _2 m set my-row -1
+ |( C; r) p$ d. ~: F( [: B) h set my-column -1- o7 w5 ]7 v e9 c; t$ v) R
set my-phase -19 a1 ]. s3 ?% s- m$ |- J
set pcolor brown + 32 l+ b: E. k! r+ e& J8 J
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;; initialize the global variables that hold patch agentsets
6 O8 c4 }4 F' }: A( j9 K set roads patches with, G( A+ T0 X, E0 S5 o
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& Z: y' |* a" L' O0 k% M
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) V% }+ ?& w/ N+ i" q& ~ set intersections roads with
9 z* U" |, k) a- `* W- T [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
+ V* o6 J$ P: ?2 P3 u- A9 L+ y3 h: H (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# s6 u p& ~% Z) o% t
) K# c; r* w" l7 Z ask roads [ set pcolor white ]5 z \' i/ p2 @& \
setup-intersections
# |- M( S0 {& @9 L! @: c/ H% Vend
( N, _* `. u* K+ H其中定义道路的句子,如下所示,是什么意思啊?
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& \6 _0 B& _" s4 P$ P$ b [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 [# T0 _7 f& ]3 i2 G
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 B3 C1 R; o5 b. 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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