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I have been struggling to understand the following section of Roy
Larsen's excellent paper on latches:
He says:
One problem to be addressed with this simple code is that the output
line (using BarsSince) can have an extended invalid signal period. In
other words it will return a value of N/A instead of a legitimate
value. This N/A period will extend from the first bar on the chart
until the `set' signal is true and the `reset' signal is valid.
My difficulty is with the last sentence.
As I understand it, BarsSince(foo) becomes valid the first time foo
is true and therefore the expression BarsSince(N) < BarsSince(X) will
become valid when all its constituents are valid i.e. when N and X
are both true for the first time. If N happens before X, I can
envisage a situation where N is true and X is valid but X has not yet
been true. In this case the N/A period will extend beyond the
situaton where "the `set' signal is true and the `reset' signal is
valid".
Can someone explain to me why the last sentence should not have read
something like:
"This N/A period will extend from the first bar on the chart until
the `set' signal and the `reset' signal have both been true at least
once".
Colin
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