[R] Data.Frame Multiplication

[Christian Schulz]

..many thanks !

Achim Zeileis wrote:

>Christian Schulz wrote:
>
>>Have got  any  R-proffessional  a starting point for me
>>how i can write me a function which multiply every column with
>>every other column in the data.frame - indenpendent from the dim's .
>>
>
>You could start from a function that multiplies a chosen column `col' of
>a data.frame `df' with the following columns
>
>  multiply <- function(df, col) df[,col] * df[,-(1:col), drop = FALSE]
>
>and then apply that to your data.frame `mydata' like
>
>  sapply(1:(ncol(mydata) - 1), function(x) multiply(mydata, x))
>
>For the latter part, there might be a better way to do that depending on
>how you want to format the output...
>Z 
>
>>Thanks in advance
>>regards,Christian
>>
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-- 
Mit freundlichen Grüßen


Christian Schulz
MetaFacts GmbH

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