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IF function usage:

=IF ( test, then_true, otherwise_value )

Ex:

=if (7>=5, 7, 5)

Test for #N/A:

=ISERROR(INDEX(GoogleFinance(“SPY”;”close”;5/11/2013;1;1);2;2))  will return TRUE

Google Finance – Stock:

Get stock price: GoogleFinance(B2,”price”)

Get closing price on a past day:INDEX(GoogleFinance(“SPY”;”close”;DATE;1;1);2;2)

Reference:

Google Drive Functions – link

IF statement – about.com

Official Google Finance stock – link   example