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2016/3/16
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20160316.md

メモ

直交座標系は、ｘとｙの値で点の位置を表し、極座標系は原点からの距離と角度で点の位置を表すもの

x=rcos(t) y=rsin(t) xx+yy=r*r

r=1+cos(t)

r=sqrt(xx+yy) t=atan(y/x)

https://bl.ocks.org/kjunichi/32b62f72d3db0a80d7fc

js

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