FSRDWR3 can add variable values from two files？

I/O API
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How to use I/O API to add variable values from two files？

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Do you mean “Create a file which contains variables taken from two files”? For that, use I/O API M3TOOLS program m3merge, which is documented at https://cjcoats.github.io/ioapi/M3MERGE.html and https://www.cmascenter.org/ioapi/documentation/all_versions/html/M3MERGE.html.

Or do you mean “Do arithmetic operations on variables taken from two files”? For that, use m3diff, which is documented at https://cjcoats.github.io/ioapi/M3DIFF.html and https://www.cmascenter.org/ioapi/documentation/all_versions/html/M3DIFF.html**

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Carlie J. Coats, Jr., Ph.D.                I/O API Author/Maintainer
Senior Software Engineer                       cjcoats@email.unc.edu
UNC Institute for the Environment                     www.ie.unc.edu
100 Europa Dr., Suite 490 / Campus Box 1105         Tel 919.843.5951
Chapel Hill, NC 27599-1105                          Fax 919.966.9920
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Thank you for your help!