R- Help (looping)

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#Reading columns (first one)
c.n1 <- 'xs1'
c1 <- with(xss, get(c.n1))
#Mean
mc1 <- mean (c1)
#Standard deviation
sdc1 <- sd(c1)
#Control Limits
L=3
uclc1 = mc1 + L*sdc1
lclc1 = mc1 - L*sdc1


I need an "if" inside a loop to do the following:

for (each column)

if (value in c1 < lclc1 | value in c1 > uclc1) {Count how many values are
outside the bounds}

And I need this process to be repeated to all columns.




2012/7/30 Rui Barradas <ruipbarradas at sapo.pt>

Hello,

Your code example doesn't make much sense, it needs decrypting. Let's see,

for(k in 1:length(c1)){
     if(c1[k] < lcl | c1[k] > ucl) {do something}
}

If this is it, then you can completely avoid the loop:

i1 <- c1 < lcl | c1 > ucl       # create an index vector
out.of.control <- c1[ i1 ]    # save the values

When you say you have a column, is it a matrix column? data.frame?
Give a data example with

dput( head(myData, 20) )   # paste the output of this in a post

Hope this helps,

Rui Barradas

Em 29-07-2012 21:59, Wellington G. Silva escreveu:

Hi,


I'm Wellington from Brazil and I have the following issue:


I've been working on a project a for a while, and I'm having trouble in
using the loop (for)


I need to read a column (c1), and for each value of this column, I need to
check if it's within the control limits


So, I was trying to do this:


For (k in 1: c1)


If (c1< lcl1 | c1 > ucl1) {here I need to store the values outside the
limits)


I have 5 columns, need to do the same process in each one of them.


And later on I'm gonna concatenate these 5 vectors and calculate its mean
for an ARL project.






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