October, 2015 < Small Fishes

Type、Class in R

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今天（或者说一直以来）犯了（着）一个很傻的错误。R的资料很多在看的时候不知道那东西用来做什么、怎么用，于是看过就忘了，比如数据的Type和Class。...

An Uranoscopidae egg collected outside Yangtze River estuary, East China Sea, Apr 2011. Diameter 1.84mm.Due to the specimen was not in good condition, oil globules which were described as multiple oil globules before(Uranoscopus japonicus, Okiyama 1988, Shao 2001) can not be observed, but clearly hexagonal grains on the egg membrane is shown below：...