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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。; f. s9 r# l; Q; {2 p
netlogo自带的social science--traffic grid这一例子当中,, U' A( F! I0 R, d7 @5 c* p' ?
globals. c. h" N* I8 g( F. D6 P, I5 L' i
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[1 G2 q3 [$ U, H: {" Q grid-x-inc ;; the amount of patches in between two roads in the x direction/ h, e8 ?3 Z) _2 _, G
grid-y-inc ;; the amount of patches in between two roads in the y direction, _3 v& s: N# e- w1 G6 o) N. M
acceleration ;; the constant that controls how much a car speeds up or slows down by if
' t5 W2 G `# k8 X R ;; it is to accelerate or decelerate+ x) h3 C! a9 L) Q, B+ _4 T+ w
phase ;; keeps track of the phase; L4 i' p* ], n
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure. e6 G9 x- `3 z2 Z3 m: Y- v
current-light ;; the currently selected light
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" O- N3 [- [! z3 V& ]* t& z ;; patch agentsets
" [& Z$ ~6 M, A( E" i: b7 X g& G intersections ;; agentset containing the patches that are intersections
% c' [3 o0 }! j d( j roads ;; agentset containing the patches that are roads1 B! i+ |- m0 W$ L
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( g& N- K2 X( T5 O& N& k0 j& I {turtles-own
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- b. ^# l$ m) M' j1 e speed ;; the speed of the turtle
( C( j: d# i8 R$ {9 h1 n4 a up-car? ;; true if the turtle moves downwards and false if it moves to the right
/ P& b: |/ Y. t5 P. t3 |6 P" ?: R wait-time ;; the amount of time since the last time a turtle has moved
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/ N `: O% H. J4 _4 b3 \patches-own
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intersection? ;; true if the patch is at the intersection of two roads3 v* N+ A! |. I
green-light-up? ;; true if the green light is above the intersection. otherwise, false.; ]! B+ ]7 M# m$ T
;; false for a non-intersection patches.! M9 z( ]+ k$ e
my-row ;; the row of the intersection counting from the upper left corner of the+ O; j0 {9 k) V8 s& g. r, O
;; world. -1 for non-intersection patches.5 K& Q6 D2 K9 L7 w
my-column ;; the column of the intersection counting from the upper left corner of the
7 m8 [* \. @8 q3 O2 Y# ~ ;; world. -1 for non-intersection patches.# l; b n7 {4 ^* I9 u+ q
my-phase ;; the phase for the intersection. -1 for non-intersection patches.% l- ~ v) ?2 J1 e% g) ]
auto? ;; whether or not this intersection will switch automatically.6 ]+ f! ]. G9 k2 M J: i0 K
;; false for non-intersection patches.% e# D$ ^: V0 q( S/ E5 T
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9 \; p q5 F) B5 o) Z" S9 q3 @;;;;;;;;;;;;;;;;;;;;;;
3 t- x; E, B. s( {;; Setup Procedures ;;2 ~1 ]2 p) K [) W
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.: z4 B0 j, y9 r8 |+ ]$ f
;; Create num-cars of turtles if there are enough road patches for one turtle to( l1 j& n' `; s5 v& D/ ~, E) z
;; be created per road patch. Set up the plots./ o7 k/ R: T% i: ?- M
to setup
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0 s! ~3 s" Z/ n, ^% e4 S2 i$ r setup-globals2 `8 X# F9 q& _. U3 |$ t
$ \( K9 `1 ], { ;; First we ask the patches to draw themselves and set up a few variables
* _" H( Z; t' m1 r9 V! r setup-patches- O+ H$ ^; p+ N6 T! u8 ` n
make-current one-of intersections5 d4 p: U- \' \/ l
label-current( i( }7 k' J. g5 h0 {: ?
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set-default-shape turtles "car": \" e" C- n' L0 A: D; D8 B
1 t( l* H7 q2 V- x if (num-cars > count roads)
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+ _# x' V, K( v& n3 |( V. f; ~ user-message (word "There are too many cars for the amount of "
6 r, O% V& S! A0 G2 }1 f2 p "road. Either increase the amount of roads "+ o* O' W/ d7 t: C- }" R$ e
"by increasing the GRID-SIZE-X or "
|: i* a* Z* k1 \ "GRID-SIZE-Y sliders, or decrease the "
2 r! {5 j. B% l A) W$ T5 N& ? "number of cars by lowering the NUMBER slider.\n"! q/ P" K9 ?0 }* g u, ~* Y7 g+ ]# _
"The setup has stopped.")1 i6 B; ^, {% L# A3 I8 H
stop# i6 x1 y! }6 j6 d$ ?% t/ e
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
2 c2 V o1 P! r3 [6 b% y" ~ crt num-cars9 d2 p/ S' {1 s
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- N# P" A7 U/ G4 y& y setup-cars; G( c1 m# z# x- F+ [( `
set-car-color
/ L6 K2 l+ h5 |" \ record-data
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;; give the turtles an initial speed
# X" d( Q" c/ ?9 j( ?' Q ask turtles [ set-car-speed ]. J {0 `; Q% k/ z! V% C
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reset-ticks( H+ f& S9 c4 ~
end7 _# t5 |$ w* m n+ q9 j
* i* ~8 I2 D1 A. o' i) K;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
/ y j2 t) Y2 h2 ?1 r set phase 01 ^( \0 _! a. Q- {
set num-cars-stopped 0' |+ r6 f5 Z, ~% f( f: p8 |1 a1 q: L, R! P
set grid-x-inc world-width / grid-size-x! h P* ^% s% o, ~
set grid-y-inc world-height / grid-size-y
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1 o6 p* _3 `; Y+ B7 A ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
* H. y3 a. w7 Z" R' m2 v1 B set acceleration 0.099
/ `7 f1 N6 H* N6 \2 Vend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
* {2 D, j v! l;; and initialize the traffic lights to one setting- k) s' [& l& Q
to setup-patches/ D+ F: V: M5 ~
;; initialize the patch-owned variables and color the patches to a base-color( A! P9 K9 P' c& A
ask patches8 i/ [. z, T) F
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set intersection? false
8 r, J, C$ w7 b; Y set auto? false I* I8 U( a, `
set green-light-up? true# U9 C7 L5 {$ I/ N
set my-row -1) n2 P, f' Y$ ~- Z, Z v# S6 E
set my-column -1
/ j" R" B2 U0 L6 d& x! Y3 D2 w set my-phase -1* m" F" {' A! {* R% w$ c5 @
set pcolor brown + 3! |* i9 `" q6 O a/ y
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;; initialize the global variables that hold patch agentsets
2 [8 ?+ f) x+ l# Q set roads patches with; N+ B) _" V/ K) i
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# L7 t* d; v. W. K' b" I( @1 m
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 d2 S8 \. R. j0 L set intersections roads with6 o) ^9 }( A7 J0 j- Q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
5 {) U$ C" ]% V (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; G- J5 z3 g! z3 s) o
9 h( Z1 p6 ?5 i' k ask roads [ set pcolor white ]
, x3 q: O5 v' h& Q3 X3 W$ w setup-intersections
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! N# j5 e+ k% m# w' c% o其中定义道路的句子,如下所示,是什么意思啊?! _3 y$ P: \0 U
set roads patches with+ }( S, V1 @4 f
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 H; I9 L! N/ A& T
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ G. F4 u" C- N% }( R
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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