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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。
' U' K3 F* _! F; C' snetlogo自带的social science--traffic grid这一例子当中,
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grid-x-inc ;; the amount of patches in between two roads in the x direction
3 ]& x3 N& C o& P8 l9 D grid-y-inc ;; the amount of patches in between two roads in the y direction
6 H) [9 W" F% Z. I' c9 `5 v' p. T# ] acceleration ;; the constant that controls how much a car speeds up or slows down by if: B; n" @" K9 ^4 q+ s4 |
;; it is to accelerate or decelerate
- v$ |8 Y8 ?6 G0 D% `+ ^/ i phase ;; keeps track of the phase; X% _: t- M" F7 x7 I+ Q3 l" s
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
! z7 R0 b& K u7 ^) r% S current-light ;; the currently selected light9 W+ u& K; U. A2 U$ }* t* \
3 D6 |9 N: Z$ H5 X ;; patch agentsets# a. m- ]/ J+ U& @2 F! X
intersections ;; agentset containing the patches that are intersections
7 @; L, ^4 r7 _% S1 G# {' n roads ;; agentset containing the patches that are roads& @# D. ^; U3 K' q
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; x- G+ P8 |1 N' ^: N. C' nturtles-own7 V# J3 k& _: P; o& }$ \
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speed ;; the speed of the turtle7 h3 @6 D/ {* O4 f9 n6 A
up-car? ;; true if the turtle moves downwards and false if it moves to the right3 S, }7 J% M" z8 E
wait-time ;; the amount of time since the last time a turtle has moved. [: r$ i) G3 c- l- w/ p* Y
]
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5 j, I9 K* f# C6 mpatches-own/ M! H3 a7 u( P4 j/ F7 C; h6 n
[
6 X0 U8 Y2 b1 l; e8 V% s- D' b intersection? ;; true if the patch is at the intersection of two roads
" W Q j/ D8 e1 t# @ green-light-up? ;; true if the green light is above the intersection. otherwise, false.0 U6 s: r2 M& u2 E* q
;; false for a non-intersection patches.8 C8 O# U7 U: y; K! r
my-row ;; the row of the intersection counting from the upper left corner of the! O/ F W7 u) ?& F* Q/ M, X
;; world. -1 for non-intersection patches.
, g( T2 M' d& z4 Z; v# i3 b my-column ;; the column of the intersection counting from the upper left corner of the
7 w- o% V% o. B) a4 v' a* \* P3 F N ;; world. -1 for non-intersection patches.
+ G8 l5 R- f0 f' D L my-phase ;; the phase for the intersection. -1 for non-intersection patches. a3 d7 S7 K+ U+ P. D5 c; k0 V
auto? ;; whether or not this intersection will switch automatically.: o7 g) T# F0 {" L: U) f
;; false for non-intersection patches.0 W6 G8 i2 F7 s8 _ O- D4 n- b# K- F, j
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;;;;;;;;;;;;;;;;;;;;;;
( a4 I0 d' r6 h* L$ F5 ]* O1 R;; Setup Procedures ;;6 f+ ~( o C9 Y! a9 j. `
;;;;;;;;;;;;;;;;;;;;;;
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5 r, v: y! M$ u9 H8 |) s4 ~) [9 Z;; Initialize the display by giving the global and patch variables initial values.
6 x+ t5 z2 m/ y;; Create num-cars of turtles if there are enough road patches for one turtle to- U0 x4 t3 m9 `% U
;; be created per road patch. Set up the plots.
; e3 e# O1 O* U& tto setup3 |" e0 h* K7 ^) r7 M
ca
! Q, l1 l8 Y' ?9 S }) b0 V setup-globals" j a% ^6 d0 {
# K; R2 H4 O$ p7 g9 l: D ;; First we ask the patches to draw themselves and set up a few variables
' z3 E# P% o7 I setup-patches
+ H, e8 A. K( F/ Q) c make-current one-of intersections
$ m" Q9 I" P! A" q B0 v; ~& o/ Z label-current% D5 d9 K9 g7 k
& @2 m: y/ t, y& W3 c0 O) X set-default-shape turtles "car"% {4 [6 O. B7 R$ g$ |
% J8 B3 Q2 S0 T% e6 X9 z if (num-cars > count roads)
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* g/ `6 q1 R) E% ^4 m user-message (word "There are too many cars for the amount of "
" M! n3 A! Z0 _# i0 U; D' C6 b "road. Either increase the amount of roads " g" X* u8 I0 A8 E. I0 ^# Q z
"by increasing the GRID-SIZE-X or "8 a. d& [' v" c. l' a* I$ L9 M o* r
"GRID-SIZE-Y sliders, or decrease the ": S* a1 R+ K2 T) `0 Z& w
"number of cars by lowering the NUMBER slider.\n"
7 S" \' w# i; @4 ~ "The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 m: W; k" N' a3 ^
crt num-cars8 {, o A4 P8 J/ }0 M4 O
[
5 n1 `! R$ w1 k* ] setup-cars
- D) Q; U8 ^, S7 x( c9 l# y( B set-car-color
; g9 a1 H( j; o2 n( { record-data
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/ ]5 ? h/ c/ s# v- e ;; give the turtles an initial speed7 O1 u; d/ u+ b9 @- v+ s- ?
ask turtles [ set-car-speed ]
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" B9 z3 n! Z1 ^: n } reset-ticks
5 t+ O8 `1 k( x+ g: r& h+ T0 ]end
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;; Initialize the global variables to appropriate values" L1 r4 z H# i* N+ h6 T- V
to setup-globals. [; j% H2 ^8 Z0 s
set current-light nobody ;; just for now, since there are no lights yet9 C% K7 C; `7 u8 e" T; D6 ]; p
set phase 0
1 z/ J4 @+ U* G+ F: e set num-cars-stopped 0
, h9 }7 r7 M8 @ set grid-x-inc world-width / grid-size-x T6 }& y; H# {2 T2 T2 x1 K
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
. D, \2 ~- u7 Y# q4 N" ~# t/ | set acceleration 0.099
! y8 R+ \6 E0 F) ?& Y0 lend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,8 Z& u) ~2 g3 ?- M
;; and initialize the traffic lights to one setting
5 x* o2 j! I0 R$ n- Zto setup-patches
6 N* o7 {7 I3 o ;; initialize the patch-owned variables and color the patches to a base-color
: [" T- w6 \% T4 g, h5 _/ W- y ask patches
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set intersection? false; s1 D4 [2 ]6 b0 d3 B3 M# T
set auto? false" [! O& q( V1 H+ g E' e1 _
set green-light-up? true7 Q, C7 a2 }7 l
set my-row -1- |: J h$ c6 E9 ~; j0 J
set my-column -1$ l% w8 Z" L4 q# C- ^ B- U8 B
set my-phase -1
" h V( `. p+ S9 u$ s3 R" L set pcolor brown + 30 e0 v: z& i/ y7 b2 J
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;; initialize the global variables that hold patch agentsets4 |( `0 J. `# b, c n' X
set roads patches with! k! ~9 w% [& V+ u
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 e8 F( b3 r9 w" ~
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* r3 K$ o7 q7 X/ H' c7 k
set intersections roads with" q$ N' b0 n$ S( Z# v
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and& N6 k7 D8 A& U4 M# [7 G3 Z T, {% V
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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4 {9 |" D" P+ \! } ask roads [ set pcolor white ]1 o, a1 c7 E1 e. R
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?
+ V) p! J# X/ \! b! B set roads patches with
3 O1 X, E* I% t* G e* B. k [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 c$ _: k& A5 w) X4 C4 ^. E
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 D* P7 l; ^# I# h& L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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