[R] rolling regression between adjacent columns

[rcoder]

Hi everyone,

I am trying to apply linear regression to adjacent columns in a matrix (i.e.
col1~col2; col3~col4; etc.). The columns in my matrix come with identifiers
at the top of each column, but when I try to use these identifiers to
reference the columns in the regression function using rollapply(), the
columns are not recognised and the regression breaks down. Is there a more
robust way to reference the columns I need, so that I can apply the
regression across the matrix; 'by.column', but every other column?

Thanks,

rcoder
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