R help - Apr 2010 - subtract a specified number of days from current date

Hi R,

 

I have a column with dates. I need to create a vector say from (current
date-90 days: current date) 

 

For example I need to subtract 90 days from say Sys.Date()-92

 

If Sys.Date()-92 ==  "Sunday", Sys.Date()-92+1

if Sys.Date()-92 ==  "Saturday", Sys.Date()-92+2

 

i.e if subtracting gives me a weekend I  need the next work day.

 

I used the below. 

ifelse(weekdays(seq(seq(tf[[i]][j,1],by="-1
day",length.out=90)[90])=="Saturday",match(seq(tf[[i]][j,1],by="-1
day",length.out=90)[90]+2,tf[[i]][,1]),ifelse(weekdays(seq(tf[[i]][j,1],
by="-1
day",length.out=90)[90])=="Sunday",match(seq(tf[[i]][j,1],by="-1
day",length.out=90)[90]+1,tf[[i]][,1]),match(seq(tf[[i]][j, 1],by="-1
day",length.out=90)[90],tf[[i]][,1])))

I would be grateful If anybody can help me with a more elegant/efficient
approach.

Thank you in advance for your time!

Ravi 

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