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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。( L2 O) d Q) W! k
netlogo自带的social science--traffic grid这一例子当中,
- |5 @, a9 B- o* Zglobals I7 a# J! F# q4 G9 a
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grid-x-inc ;; the amount of patches in between two roads in the x direction1 k4 r: S. y/ J- s* N
grid-y-inc ;; the amount of patches in between two roads in the y direction/ {- _# R( Y# I4 R$ h1 T
acceleration ;; the constant that controls how much a car speeds up or slows down by if
5 }# {% t5 P! v ;; it is to accelerate or decelerate
6 K, N( V- ^% ^+ q/ n+ z phase ;; keeps track of the phase
+ H6 I* h u3 @, H1 t4 R4 y$ d num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure8 ]" g! E$ Q: u* k
current-light ;; the currently selected light9 E8 S' t4 @, }# P4 x8 R
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;; patch agentsets
; K5 `: R# N/ V! I intersections ;; agentset containing the patches that are intersections
' f5 s7 ^# W! F# o& F" J" s roads ;; agentset containing the patches that are roads
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$ ~: P& e- G- x D6 ]turtles-own
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/ Q4 V. v/ v% p. ^; U2 ~ speed ;; the speed of the turtle
1 a$ A9 {# V$ c. V+ w# L! ^ up-car? ;; true if the turtle moves downwards and false if it moves to the right
- B$ \0 t7 b, P0 C# h wait-time ;; the amount of time since the last time a turtle has moved
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- ^$ Y: I" f+ N+ Jpatches-own$ ?4 W2 [6 p$ ~0 Q/ Q8 ?
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7 W% M* M9 a0 x' j7 ^ intersection? ;; true if the patch is at the intersection of two roads
2 W! q$ _. s6 I8 D5 S6 O9 L5 W green-light-up? ;; true if the green light is above the intersection. otherwise, false.
/ J8 Y; {6 R$ d6 O& A ;; false for a non-intersection patches.4 t2 [% v! y6 I5 o2 k3 g3 ~4 `
my-row ;; the row of the intersection counting from the upper left corner of the
: ~6 M: K) ^# S! ]. e: N9 e7 M ;; world. -1 for non-intersection patches.
0 t: a& l+ N% J# U: u my-column ;; the column of the intersection counting from the upper left corner of the; y8 z) m( o5 n9 |$ b: s/ |8 f
;; world. -1 for non-intersection patches.4 }- ~) G. @1 b/ c. P: s8 ?
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
, A+ A4 t/ c8 W auto? ;; whether or not this intersection will switch automatically.: T0 J. L* Z* f2 ~0 y* {& J
;; false for non-intersection patches.. c7 i' g* K& V9 w L( d
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;;;;;;;;;;;;;;;;;;;;;;
! J2 R) R# I5 j) |- G+ u3 E;; Setup Procedures ;;
5 Z) [' `* w, j;;;;;;;;;;;;;;;;;;;;;;
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9 q$ n+ V" S1 P( V4 C( H;; Initialize the display by giving the global and patch variables initial values.
* k6 \9 [* u+ R/ G: H;; Create num-cars of turtles if there are enough road patches for one turtle to
; Z) B4 H( i; f( n& ]& B;; be created per road patch. Set up the plots.! v2 G9 F$ Z; ]% K8 u3 C# j K
to setup! g$ l1 S8 P% B
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setup-globals
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" T" E" `# o9 X3 [, N1 ]; L" A ;; First we ask the patches to draw themselves and set up a few variables
4 h. H" J$ p& E# @ setup-patches; O/ ^: Y: E. Q
make-current one-of intersections
$ j# c6 t" l8 A& x label-current$ J* _+ K- N" x0 O5 T9 W6 _. ?! t
4 r0 Q$ W- R- V, G( H8 I6 ?! X set-default-shape turtles "car"
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! L' O, X" F+ ~; E. z$ ^& E if (num-cars > count roads)' ^ ?* Z) s9 |' Y* \: X
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0 f! `' G1 x( A+ T4 a user-message (word "There are too many cars for the amount of "
& N% q( R. C$ {8 K. w3 v, J "road. Either increase the amount of roads "
* B$ R( H1 ^6 I. E* E4 L3 X- B( L0 g "by increasing the GRID-SIZE-X or ") o" i5 D4 ?3 L1 T: D: E6 y( Q; K
"GRID-SIZE-Y sliders, or decrease the "
* |4 k' l! L* b: k% Y( V# T, E "number of cars by lowering the NUMBER slider.\n"9 N: i' `$ ~1 w4 y$ Z: x
"The setup has stopped."); J; u$ [4 i1 E7 ?; _1 h
stop+ C0 B0 M% X8 [& V9 ~; o) j
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; [. G' e8 v# B ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
+ I( P/ _% Z ]7 z* {) a0 Y crt num-cars
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setup-cars. @4 W& Y9 y' S1 d
set-car-color
8 }1 h$ D7 j% z; f- |7 F8 ` record-data
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;; give the turtles an initial speed$ v% B" |& f4 Z& G
ask turtles [ set-car-speed ], j# @6 A8 n" p V% `' _6 ~8 k6 z
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reset-ticks7 ^% i5 K* d' y w8 t* k' M
end$ h! W; @- ~ G/ D' l1 Y
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;; Initialize the global variables to appropriate values
# Y1 X5 Y$ g8 T; [" Pto setup-globals
) B8 Z: e" P/ h3 _9 h set current-light nobody ;; just for now, since there are no lights yet) e1 G5 E6 F3 p( [# m$ d. F
set phase 0
: ^1 n ] m8 @: w. C+ R3 P$ k set num-cars-stopped 0' G) _, V e6 @+ @+ n
set grid-x-inc world-width / grid-size-x) T& Q1 ?/ s, l/ H6 ^
set grid-y-inc world-height / grid-size-y
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) ^5 V5 F9 G# Z ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
0 U: W: I& q- @; \0 p set acceleration 0.099- z: m+ X$ M9 K& O
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 i% t I: ^' _$ W( w9 ^;; and initialize the traffic lights to one setting
% _0 _, R& _7 v* t0 T" @% jto setup-patches) m6 M6 q3 ?1 ?! I
;; initialize the patch-owned variables and color the patches to a base-color, O9 Y& |, n% p( @ S
ask patches7 i: {% o* g; M+ s
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set intersection? false
, l8 Z6 ]. _9 y! l set auto? false6 E& {& l/ E2 i2 P
set green-light-up? true
* Y4 D8 q, s3 ^2 G9 h1 Z" d p set my-row -1# ^6 {5 v6 B' G
set my-column -13 z; I& F# k# y/ ?: k0 \9 N
set my-phase -1
* G: R! s: m, a; X+ k& O set pcolor brown + 3
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+ f& B% f" R9 L" r# D& H ;; initialize the global variables that hold patch agentsets
( V3 r. M9 P! B/ u5 }5 N# a set roads patches with, w- f6 n% J6 N9 n! E
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& m4 w& i, V# `4 I0 r8 x
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ J/ C, S5 c( t% U0 _+ F set intersections roads with5 {" z& r7 w; E+ O0 ~+ F! I
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
6 o8 i8 x1 ~: P: {5 f (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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. i- [8 d& R+ v- F ask roads [ set pcolor white ]+ [# |% P" U5 J; ^% @
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?
# R: Q* s" ~( i u* y. w6 b set roads patches with9 Y( f7 F# |- o& f) i5 R
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% Z9 C2 m x& f6 r7 V$ C9 Q' F' N
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 q" m1 ?! x2 L9 p6 C
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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