Replace all 0 values to NA?

I have a dataframe with some numeric columns. Some row has a 0 value which should be considered as null in statistic...

Create an empty data.frame?

I'm trying to initialize a data.frame without any rows. Basically, I want to specify the data types for each column ...

How does one reorder columns in a data frame??

How would one change this input (with the sequence: time, in, out, files): Time In Out Files 1 2 3 ...

Test if a vector contains a given element?

How to check if a vector contains a given value? ...

What are the differences between “=” and “<-” assignment operators in R??

What are the differences between the assignment operators = and &lt;- in R? I know that operators are slightly dif...

How to debug “contrasts can be applied only to factors with 2 or more levels” error??

Here are all the variables I'm working with: str(ad.train) $ Date : Factor w/ 427 levels "2012-03-24...

Create an empty data.frame?

I'm trying to initialize a data.frame without any rows. Basically, I want to specify the data types for each column ...

Plot two graphs in same plot in R?

I would like to plot y1 and y2 in the same plot. x &lt;- seq(-2, 2, 0.05) y1 &lt;- pnorm(x) y2 &lt;- pnorm(x, 1, 1...

Combine two data frames by rows (rbind) when they have different sets of columns?

Is it possible to row bind two data frames that don't have the same set of columns? I am hoping to retain the colum...

Replace all 0 values to NA?

I have a dataframe with some numeric columns. Some row has a 0 value which should be considered as null in statistic...

Counting the number of elements with the values of x in a vector?

I have a vector of numbers: numbers &lt;- c(4,23,4,23,5,43,54,56,657,67,67,435, 453,435,324,34,456,56,567,...

Use of ~ (tilde) in R programming Language?

I saw in a tutorial about regression modeling the following command : myFormula &lt;- Species ~ Sepal.Length + Sepa...

How should I deal with “package 'xxx' is not available (for R version x.y.z)” warning??

I tried to install a package, using install.packages("foobarbaz") but received the warning Warning message: pack...

duplicate 'row.names' are not allowed error?

I am trying to load a csv file that has 14 columns like this: StartDate, var1, var2, var3, ..., var14 when I issu...

The difference between bracket [ ] and double bracket [[ ]] for accessing the elements of a list or dataframe?

R provides two different methods for accessing the elements of a list or data.frame: [] and [[]]. What is the diffe...