## Converting between vector types - Cookbook for R.

Convert A to a MATLAB function representing a numeric matrix, and write the result to the file myfile1. By default, the generated MATLAB function creates the dense numeric matrix specifying each element of the matrix, including all zero elements.

Factor. Factors are normally used to group variables into a fixed number of unique categories or levels.For example, a dataset may be grouped by gender or month of the year. Such data are usually loaded into R as a numeric or character data type requiring that they be converted to a factor using the as.factor() function. In the following chunk of code, we create a factor from a character object.

Startup: Initialization at Start of an R Session stop: Stop Function Execution stopifnot: Ensure the Truth of R Expressions strptime: Date-time Conversion Functions to and from Character strrep: Repeat the Elements of a Character Vector strsplit: Split the Elements of a Character Vector strtoi: Convert Strings to Integers strtrim: Trim Character Strings to Specified Display Widths structure.

Integer In order to create an integer variable in R, we invoke the integer function. We can be assured that y is indeed an integer by applying the is.integer function.

Re: How to convert character matrix or data.frame to numeric? In reply to this post by ivan popivanov Hi, I find the following works in R 2.10.1 on Mac OSX.

This example shows how to convert numeric values to text and append them to larger pieces of text. For example, you might want to add a label or title to a plot, where the label includes a number that describes a characteristic of the plot. You can convert numeric values to strings or character vectors. You can convert them to decimal, hexadecimal, or binary text representations. The same.

Why are you reading them in as character to begin with? Looks like you might have sub-contracted coding your data step to PROC IMPORT? Why does the file have character strings in numeric variables? Did you generate that file from R perhaps? Can you teach R to not do that? It is easier to conv.