Menyambut Bulan Puasa.

 Tentu saja menyiapkan kuota.

 Menyimpan sebanyak mungkin puisi bagus untuk di-paste di grup-grup media sosial.

 Menyusun draft untuk meminta maaf via sms atau messenger lain sehari sebelum puasa, terlepas bahwa minta maaf itu harusnya terjadi saat kita melakukan kesalahan, atau pas hari raya. Yang penting ikut trend.

 Oh iya, bisa juga buka-buka sms lama tahun lalu, cari yang bahasanya keren, jawa kuno, lucu, atau yang gak jelas sekalian. Diusahakan tahun ini dikirim kepada kontak baru atau yang tahun lalu belum pernah dapat.

 Ehm, sekarang kan juga banyak "gambar tulisan" tentang segala hal. Tentu saja besar kemungkinan ada "gambar tulisan" tentang awal puasa.

 Ohya, jangan lupa set reminder untuk sepuluh hari terakhir puasa. Itu musim "sharing" tulisan-tulisan tentang keutamaan berbagai macam kegiatan, yang biasanya di bawahnya ada catatan: "kirim ke limapuluh kenalan agar dijamin masuk surga minimal level 5".  Meskipun berat di bandwith dan kuota, tak ada salahnya ikut tren yang ini.

 Kemungkinannya kecil, tapi usahakan cari masjid yang ada akses wifi gratis, biar saat selfie di sana bisa langsung upload. Mungkin saja seratus posting pertama dengan hashtag #tarwih mendapat bonus poin pahala.

 Selamat bersiap-siap, :)

#edisiError
#Naya

Normal Mode

 Planned to write coupled oscillator, using double spring.

 For some reason, Vpython refused to set length of helix with some value from array or list or any value derived from them. It only accept plain number or  number from simple variable (like a = 3. ). It hugely messed the whole script as I used l = [] for helix length.

 So, rewriting the code, create l0 and l1 manually.

 Didn't have energy to code the rest. So, at the moment, just call it "normal mode" coupled oscillator, heheh...

#code

from visual import *
from random import uniform,random
from visual.controls import *

display(center=(0,0,0),background=(1,1,1), autoscale=False, range=(5,5,3),        
        width=600, height=600,  forward=(-1.4,-1.3,-1)) #arah kamera

distant_light(direction=(1,1,1), color=color.red)
n       = 2
dt      = 1./8.
pegas   = []
kotak   = []
w       = ones(n)
w       /= 2.
for i in arange(n):
    spring  = helix(pos=(0,0,0), axis=(5,0,0), radius=0.2, color=color.red, length=1.)
    pegas.append(spring)
    ko      = box(pos=(0,0,0), width=.5, height=.5, length= .5, color= color.green)
    kotak.append(ko)

k0      = 1.
m0      = 1.

l00     = 1.
l01     = 1.

l0      = 1.1
l1      = 1.

x0      = l0+w[0]/2

v0      = 0.
v1      = 0.


y = 1.
print pegas[0].length
def updatePegas():
    global x0
    kotak[0].x      = x0
    pegas[0].length = l0
    
    x1              = l0+w[0]+l1+w[1]/2
    kotak[1].x      = x1
    pegas[1].x      = l0+w[0]

    

def proses():
    global l0,v0,x0
    dx      = l0-l00
    f0      = -k0*dx
    a0      = f0/m0
    v0      += a0*dt
    l0      += v0*dt
    x0      = l0+w[0]/2

    
    updatePegas()
    
while 1:
    rate (19)
    y   += .1
    proses()

    
    
    
    

    

.

Sharing

 Jadi ceritanya gini:

 Saya berangkat sekolah,

 trus diperkosa,

 trus dibunuh.

 The End.

 Mohon dicopy dan sebarluaskan ke medsos ya, :D

 #edisiError
 #Naya

One Blog a Day keep Doc Away

 :)

Spring.

 Bahan baru buat ide jahil besok, :)

#code
from visual import *
from random import uniform,random
from visual.controls import *

display(center=(0,0,0),background=(1,1,1), autoscale=False, range=(3,5,3),        
        width=600, height=600,  forward=(-1.4,-1.3,-1)) #arah kamera

distant_light(direction=(1,1,1), color=color.red)
spring = helix(pos=(0,2,1), axis=(5,0,0), radius=0.5, color=color.red)

dl  = .1
l   = 1.
def proses():
    global l,dl
    spring.length = l
    if l>2:
        l   = 2
        dl  *= -1
    elif l<.5:
        l   = .5
        dl  *= -1
    l   += dl

while 1:
    rate (19)
    proses()
    
    
    
    

    

.

Piston Free Expansion Oscillation.

The result of daydreaming, :)

#code
from visual import *
from random import uniform,random
from visual.controls import *

display(center=(0,0,0),background=(1,1,1), autoscale=False, range=(5,7,7),        
        width=600, height=600,  forward=(0.4,-0.3,-1)) #arah kamera

distant_light(direction=(1,1,1), color=color.red)
cylinder(pos=(-4,0,0), axis=(7,0,0), radius=1, color=color.green, opacity=.1)
piston  = cylinder(pos=(-2,0,0), axis=(1,0,0), radius=.7, color=color.red)
piston1  = cylinder(pos=(-2,0,0), axis=(5,0,0), radius=.1, color=color.red)

p0  = 1.
A   = 1.
x0  = 5.        #panjang piston
c   = p0*A*x0
x   = 3
dx  = x0-x       #
m   = 1.
v   = 0.
dt  = 1./8.
def proses():
    global x,v,dx
    p   = c/x
    dp  = p-p0
    print x,dp
    f   = -dp
    a   = f/m
    v   += a*dt
    dx  += v*dt
    x   -= v*dt

    piston.x    = dx
    piston1.x    = dx
while 1:
    rate (19)
    proses()
    
    
    
    

   

.

Ball Oscillation Inside a Sphere

 with Visual Python.

 I use nonlinear solution, :)

#code
from visual import *
from random import uniform,random
from visual.controls import *

display(center=(0,0,0),background=(1,1,1), #autoscale=False,        
        width=600, height=600,  forward=(-0.4,-0.3,-1)) #arah kamera

distant_light(direction=(1,1,1), color=color.red)

dl  = .01
l   = 1.1

box(color=color.white, pos=(0,0,0),length=2*l,height=dl, width=dl, opacity=.3)
box(color=color.white, pos=(0,0,0),length=dl,height=2*l, width=dl, opacity=.3)
box(color=color.white, pos=(0,0,0),length=dl,height=dl, width=2*l, opacity=.3)


bola1 = sphere (pos=(0,0,0), radius=1.1, color=color.green, opacity=.3)
bola = sphere (pos=(1,0,0), radius=.1, color=color.red)

r   = 1.
x   = 1.
m   = 1.
g   = 1.
vx  = 0.
dt  = 1./16.
def proses():
    global x,vx
    f   = -m*g*x/r
    a   = f/m
    vx  += a*dt
    x   += vx*dt
    r2  = r*r
    x2  = x*x
    if x2>r2:
        x2 = r2
    y   = r-sqrt(r2-x2)
    bola.x  = x
    print x
    bola.y  = y-r
    
while 1:
    rate (19)
    proses()
    
    
    
    

    

.