create_metric: Create metric class
In PortfolioEffectHFT: High Frequency Portfolio Analytics by PortfolioEffect

Description Usage Arguments Value Author(s) Examples

Creates metric object using data provided in matrix or xts format.

## S4 method for signature 'matrix,character'
create_metric(metricData,symbol)
## S4 method for signature 'xts,character'
create_metric(metricData,symbol)

`metricData`	Matrix of (time, value) rows or an xts object. Time should be in POSIX format expressed in milliseconds.
`symbol`	Unique identifier of the instrument

Metric object

Kostin Andrey <andrey.kostin@portfolioeffect.com>

## Not run: 
data(aapl.data)
data(goog.data)
AAPL=create_metric(aapl.data,'AAPL')
GOOG=create_metric(goog.data,'GOOG')
plot(AAPL,GOOG,legend=c('AAPL','GOOG'))

## End(Not run)