Calculate Subtraction Matrix

Calculate the Subtraction Matrix of a given a vector

1. Put the files values.txt and subtraction_matrix.R in the same folder.
2. Execute in the Terminal:

$ Rscript subtraction_matrix.R

The Warning message: "NAs introduced by coercion" indicates you have some non-numeric value(s) in your values.txt file.

3. The output matrix should be in a Comma Separate Value (.csv) file named subtraction_matrix.csv.