Please correct my formula for me.

c > vstop and c.1 <= vstop

Thanks r. reeder

Your formula has two issues. One of them is minor.

C.1 should be C1 instead. The first parameter is not separated from its indicator by a period. It just follows the indicator directly. Additional parameters use periods between them in indicators in the Personal Criteria Formula Language so you know where one stops and the next one begins.

The second issue is major.

The Personal Criteria Formula Language not have built in syntax for the Volatility Stop. In general if there isn't syntax listed in the PCF Formula Descriptions topic for an indicator, function or operator, it is not available.

In many cases it is possible to manually construct an Indicator Formula for an indicator which is not built in by combining what is available. It is not possible to create an Indicator Formula for the Volatility Stop however which is short enough to be practical.

All is not lost. Unlike the formula you requested in the Vstop vs price topic, it is possible to create a Condition for your requested formula, albeit not as a formula.

Add your Volatility Stop to the charts and then click on Price History and select Create Scan Condition. Expand the Price History vs Volatility Stop section in the Condition drop-down if necessary and Crossing Up Volatility Stop.