[R] If then test

[Petr PIKAL]

Hi

r-help-bounces at r-project.org napsal dne 28.01.2010 09:21:31:

> 
> close,
> 
> So I have a vector, lets say
> 
> [1] 1.5 1.2
> 
> And a matrix
>      [,1] [,2]
> [1,] 1.9   1.3
> [2,]-.2   2
> 
> I want to somehow use the first number in my vector(1.5) and compare 
this
> number to my whole first column. So I want to see how many times the 
numbers
> in column 1<1.5 which should be 1 in this case. Now for the other 
number, we
> compare 1.2. We get 0. So I need a vector to have these results like 
> 
> [1] 1 0 

If you change your matrix to data frame and you can use mapply

> colSums(mapply(function(x,y) x<y, daf, vec))
X1 X2 
 1  0 
 

> 
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