search for: pfleonard

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2003 Jun 09
1
Basic question on applying a function to each row of a da taframe
Another neat way is: with(DF, foo(x, w)) HTH, Andy > -----Original Message----- > From: peter leonard [mailto:pfleonard at hotmail.com] > Sent: Sunday, June 08, 2003 4:35 PM > To: r-help at stat.math.ethz.ch > Subject: [R] Basic question on applying a function to each row of a > dataframe > > > Hi, > > I have a function foo(x,y) and a dataframe, DF, comprised of > two vectors, x &...
2003 Jun 08
6
Basic question on applying a function to each row of a dataframe
Hi, I have a function foo(x,y) and a dataframe, DF, comprised of two vectors, x & w, as follows : x w 1 1 1 2 2 1 3 3 1 4 4 1 etc I would like to apply the function foo to each 'pair' within DF e.g foo(1,1), foo(2,1), foo(3,1) etc I have tried >apply(DF,foo) >apply(DF[,],foo) >apply(DF[DF$x,DF$w],foo) However, none of the above worked. Can anyone help ?
2003 May 31
3
function to populate a matrix based on a lookup to another matrix ?
Hi, This is a beginner R question. I have a 4x4 matrix named 'lookup' with the following values: 1 2 3 4 1 0.000000 2.828427 5.656854 8.485281 2 2.828427 0.000000 2.828427 5.656854 3 5.656854 2.828427 0.000000 2.828427 4 8.485281 5.656854 2.828427 0.000000 I then create a new empty matrix named 'dd' with specfic row and col names :