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what is the initial value of function PREV?
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for examples,
if(c>prev,100,150)
what is the initial value of PREV?
another example,
abc:=prev+1
what is the initial value of PREV?
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Rank: Member
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in if(c>prev,100,150)
what C>prev will return? TRUE or FALSE?
and what if(c>prev,100,150) will return? 100 or 150?
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Rank: Advanced Member
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It will return TRUE or FALSE, unless PREV is N/A, which is similar to the Excel NA() function, meaning "no value available". After the first bar, it will return 100 or 150, depending on the CLOSE price.
Try this: Create and Indicator "if(c>prev,100,150) " and plot it. Then use the menu command VIEW, DATA WINDOW. Scroll all the way to the left, and move your mouse pointer to the first bar. In the Data Window, you will see the Indicator value, just as MetaStock sees them. At the extreme left, it will be "N/A".
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Try plotting your indicator on the chart yourself.
See that on the first bar, the indicator returns N/A because there is no previous value in the self-data array.
On the second bar, the value will be FALSE (150) because of the comparison between price and N/A
Thereafter, it depends on the comparison between price and the previous value of the self-data array.
What are you trying to achieve? Be specific.
wabbit [:D]
[edit]and by doing the experiment you find out more... the value of the second bar is dependent on the test on the first bar which happens, but N/A is still returned?!
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Rank: Member
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understood !!
thank you guys so much!!
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PREV assumes that an N/A value is zero or FALSE and will build on that from the first valid bar.
Roy
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what is the initial value of function PREV?
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