R : How to add new column in R data frame showing sum of a value in a current row and a prior row, i

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R : How to add new column in R data frame showing sum of a value in a current row and a prior row, if certain conditions are met in the 2 rows?
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R : How to add new column in R data frame showing sum of a value in a current row and a prior row, if certain conditions are met in the 2 rows?
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