Paper Size

1in = 2.54cm

A4	= 21.0cm × 29.7cm	= 8.27in × 11.69in
A4 − 1in margins	= 15.92cm × 24.62cm	= 6.27in × 9.69in
Letter	= 21.59cm × 27.94cm	= 8.5in × 11in

Parameters and Arguments

Parameters are the things when you define the function. Arguments are the things when you call the function.

int f(int x) { return x + 1; } // x is parameter
int main() { cout << f(2 + 3); } // 2 + 3 is argument

Terrible mnemonic:

• Parameters have parallel structure --- just [type name] [var name] or some variant thereof, nothing fancy.
• Arguments can include arithmetic operations, or any other kind of operations.

• Parameters are part of the function definition.
• Arguments are what actually arrive inside the function.

The only reason I'm remembering this is to be technically correct ("the best kind of correct!")

qNSOrfkVpr

tinyurl is not dependable :-/


http://share.xmarks.com/folder/bookmarks

GIMP modes

http://docs.gimp.org/2.8/en/gimp-concepts-layer-modes.html
M = mask (top), I = image (bottom)

• normal: E = M
• dissolve: E = M or I, randomly picked per pixel
• multiply: E = M × I / 255
  
  • darker
• divide: E = I × (256 / (M+1))
  
  • brighter, brightens dark M parts strongly
• screen: E = 255 − (255 − M)(255 − I)/255
  
  • brighter, equiv. "multiply" conjugated by inversion
• dodge: E = I × (256 / (256−M))
  
  • brighter, brightens bright M parts strongly; equivalent to divide with inverted mask
• burn: E = 255 − (255 − I) × (256 / (M+1))
  
  • darker, darkens dark M parts strongly
• hard light: super complicated
  
  • for M in [0,128] it's multiply with 2M; for larger M it's all conjugated with inversion
• soft light: also complicated, I somehow doubt the documentation...
• grain extract: E = I − M + 128
• grain merge: E = I + M − 128
• difference: E = |I − M|
• addition: E = M + I
• subtraction: E = I − M
• darken: E = min
• lighten: E = max
• hue, saturation, brightness, value: takes that component from M and others from I

Bx

+0.25: ε → 1 → 8 → 13 → 20 → 35
+0.5: 35 → 55 → 85 → 125
+1.5: 125 → 200
+1: 200 → 250 → 300 → 350 → 400 → 450

chem

R = 0.082 L⋅atm / mol⋅K

at STP (0°C, 1 atm): 22.4 L / mol

H  =   1.008

C  =  12.011
N  =  14.007
O  =  15.999
F  =  18.998

Na =  22.990
Mg =  24.305
P  =  30.974
S  =  32.06
Cl =  35.45

K  =  39.098
Ca =  40.078
Br =  79.904
I  = 126.904