[R] would you give me your hand to standardize columns in a matrix?

[Rui Barradas]

Hello,

Try

scale(test[, c("temp", "oxy")])

Hope this helps,

Rui Barradas

Em 28-06-2012 20:11, Kristi Glover escreveu:
>
> Hi R User,
> Would you give me your hand to standardize some columns in a matrix?
>
> I have included the example table.
>
>> dput(test)
> structure(list(X = c(1, 2, 3, 4, 5, 6), Y = c(4, 5, 6, 7, 8,
> 9), temp = c(0.818, 0.113, 0.256, 0.587, 0.955, 0.207), oxy = c(0.797,
> 0.487, 0.727, 0.128, 0.514, 0.031)), .Names = c("X", "Y", "temp",
> "oxy"), row.names = c(NA, -6L), class = "data.frame")
>
> here I wanted to standardize the variable "temp" and "oxy". I have more than 75 variables so that I need to apply 'loop'.
>
> Could you help me to make a loop?
>
> I wrote following but, it did not work.
>
> for (i in 1:n(test)){
> for (t in 1:T (test)) x.z[i] = (x[i,t] - mean(x(i,]/sd)x[i,])
> }
>
> Thanks for your help.
>
> Kristi
>
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