On 13.07.2011 17:46, Bansal, Vikas wrote:
Dear all,
I have a data frame df and i am using a code shown below.
df[, "total"]<- rowSums(df[, 3:6]) MAKING A NEW COLUMN total in df BY
ROWSUMS
defineSamples<- function()
{
readline("enter the number of INDIVIDUALS IN POOL: ")
}
df$ind=definesamples() CALLING THE FUNCTION AND STORING THE INPUT FROM
USER IN NEW COLUMN OF df
This won't work, because
1. defineSamples != definesamples
2. readline returns a character but you expect a numeric value - which
is why you get the error message. Just coerce to numeric and implement a
careful check if the entered value can be coerced successfully.
Uwe Ligges
df[, 3:6]<- apply(df[, 3:6], 2, function(x) x / df[, "total"] * df[, "ind"] *
2) APPLYING A MATHEMATICAL FORMULA
I am taking an input from user which is stored in ind column of df.and then i
am applying a formula showed in last line of code.
But it shows this error-
Error in x/df[, "total"] * df[, "ind"] :
non-numeric argument to binary operator
but if i am not taking input from user and using straight way this-
df$ind=9
then it is working.
But i want to enter the value of ind from user.Can you please tell me how can i
remove this error.
Thanking you,
Warm Regards
Vikas Bansal
Msc Bioinformatics
Kings College London
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