[R] Please Please Please Help me (Changed to: calling a function with a list of parameters)

[Dieter Menne]

Please, do not write "Help, Help" but give a meaningful header. Most people
here a specialized and check the posts they understand best.


Madhavi Bhave wrote:
> 
>  
> (I have already written the required R code which is giving me correct
> results for a given single set of data. I just wish to wish to use it for
> multiple data.)
> 

It's fine that you posted the working part; in general, for posting you
should simplify the thing that do work to the bare bones (see example below)


Madhavi Bhave wrote:
> 
> I have defined a function (as given below) which helps me calculate
> Macaulay Duration and Modified Duration and its working fine with given
> set of data.
> 
> I just want to use this code for multiple data so that I get an output
> something like
> 
>          maculay_duration                    modified_duration
>  
>           1423.797                                   1423.795
>  
>              44.339                                       44.307
>  
> 

The most elegant approach uses package plyr; you even get the function
parameters in your output.

library(plyr)
# simplified version of your original function
duration = function(par_value, coupon_rate) 
{
  data.frame(macaulay_duration=2*par_value,modified_duration=3*coupon_rate) 
}

# use read.table in your application instead of the line below
pars = data.frame(par_value=c(1000,100), coupon_rate=c(10,7))

mdply(pars,.fun=duration)
#  par_value coupon_rate macaulay_duration modified_duration
#1      1000          10              2000                30
#2



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