R - Function to create a data.frame containing manipulated data from another data.frame -


hi new r , have question. have data.frame (df) containing 30 different types of statistics years 1960-2012 100 different countries. here example of looks like:

     country      statistic.type     1960      1961      1962      1963 ...  2012  __________________________________________________________________________________ 1    albania      death rate          10        21        13        24        25   2    albania      birth rate          7         15        6         10        9   3    albania      life expectancy     8         12        10        7         20   4    albania      population          10        30        27        18        13 5    brazil       death rate          14        20        22        13        18 6    brazil       birth rate          ...   7    brazil       life expectancy     ...   8    brazil       population          ...   9    cambodia     death rate          ...   10   cambodia     birth rate          ...                  etc...

note there 55 columns in total , values in each of 53 year columns made purposes of question.

i need writing function takes inputs country , statistic type , returns new data.frame 2 columns shows year , value in each year given country , statistic type. example, if input country=brazil , statistic.type=death rate function, new data.frame should like:

     year    value  _____________________ 1    1960     14 2    1961     20 3    1962     22 ... 51   2012     18

i have no idea on how this, if can give me ideas/code/packages install helpful.

thank much!

if df data.frame, need this:

f <- function(country, statistic.type, data=df) {  values <- data[data$country==country & data$statistic.type==statistic.type,-(1:2)]   cbind(year=names(df)[-(1:2)], value=values) }

use as

f(country="brazil", statistic.type="death rate")

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