[R] using temporary arrays in R

[dxc13]

useR's,

Is there a way to create a temporary array (or matrix) in R to hold values,
then drop or delete that temporary array from memory once I do not need it
anymore?

I am working with multidimensional arrays/matrices and I frequently perform
multiple operations on the same matrix and rename it to be another object. 
I want to be able to delete the older versions of the array/matrix to free
up space. 

Thank you. 
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