port_update: Plot Returns of different portfolios
In philbtcecho/btcecho: Analysis functions used by BTC-ECHO for research purposes.

Description Usage Arguments Value Author(s) Examples

Plot one portfolio-development in comparison to two other ones

1	port_update(date_margin, returns, offset, portfolio)

`date_margin`	A string specifying the start- and enddates
`returns`	A xts with several columns consisting of data
`offset`	A vector defining the portfolio weights
`portfolio`	A vector defining the portfolio weights

A xts with development of portfolio

Philipp Giese

returns_safe<-calculate_mutliple_cc("CCCAGG",c("BTC","LTC","DASH"),"USD",7,T)
portf_safe<-c(0.3,0.4,0.3)
returns_medium<-calculate_mutliple_cc("CCCAGG",c("ADA","EOS","ZRX"),"USD",7,T)
portf_medium<-c(0.2,0.4,0.4)
returns_risky<-calculate_mutliple_cc("CCCAGG",c("PAY","BNB","ZCL"),"USD",7,T)
portf_risky<-c(0.2,0.4,0.4)
plot_rendite_comp(returns_safe,portf_safe,returns_medium,portf_medium,returns_risky,portf_risky,"20180915/","bottomleft")