Add Volume of a series, if available, to the current chart. This is the default TA argument for all charting functions.
addVo(log.scale=FALSE)
Volume will be draw in a new window on the current chart. A chobTA object will be returned silently.
use log-scale for volume
Jeffrey A. Ryan
Add volume bars to current chart if data object contains appropriate volume column.
log.scale will transform the series via standard R graphics mechanisms.
addTA
if (FALSE) { addVo() }
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