How can I interpolate an ocean's variable without interpolate the continents?

I have a matrix with ocean's variable and another matrix with the grid for continents, but all the functions for interpolation doesn't have an option for exclude cells. Do you have an idea to accomplish this?

P.S. it doesn't worth make an interpolation and then cut the continents

Answer 1

[Chad Greene]

You can use the island function in the Climate Data Toolbox for Matlab to determine which grid cells are land and which ones are ocean. With that mask, you can then fill in the land or ocean values however you'd like.