calculate unclosed orders' mean open price for a specific instrument and holdings side.
character, instrument identifier.
character, "long" or "short", specifying holdings's side.
meanopen will calculate mean price according to following rules: 1. earlier open orders are prior to be closed. 2. return volume weighted mean of unclosed order's transaction price.
numeric, mean open price.
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## Not run: ## check long holdings' mean open price of TF1603 meanopen("TF1603","long") ## End(Not run)
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