Calculating the intercept and the slope
<I will put the program example here later>
How to draw a line in X-Y graph
x=c(-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
y=-2*x+3
y
plot(x,y)
Calculating the distance between two points (Euclidian distance)
- Watch youtube video
- Replicate it with R
x1=5
y1=2
x2=-3
y2=-4
d=sqrt( (x1-x2)^2 + (y1-y2)^2 )
d
<The answer is: d=10>
Caluculating the distance between two points on the globe
http://www.movable-type.co.uk/scripts/latlong.html
Reference:
R and Linear Algebra
http://blog.revolutionanalytics.com/2013/08/r-and-linear-algebra.html
Matrix
http://www.inside-r.org/r-doc/Matrix/Matrix
3D mattping
http://technology.cpm.org/general/3dgraph/
Proving Pythagoras' formula (in Japanese)
http://www004.upp.so-net.ne.jp/s_honma/pythagoras/pythagoras3.htm
Basic arithmetic training (Japanese)
http://dailywork.net/modules/100masu/
Fractals by R