Interpolating to remove zeros

I started with a matrix of dimension n*3 did some manipulations and now i have a matrix with dimensions m*3 where n>m . Suppose I start with a matrix of 200*3 and after the filtering I get rows 1 to 5 as zero rows and the total number of rows reduces to 190. But in the final output I want the same number of rows. So what I a thinking is to take the first element of new Matrix and interpolate to remove the initial zero values. At the end similarly take the last value of new matrix and extrapoate .

is the above method correct and is there a better method?Any suggestions for solving the above problem.

Answer 1

[Image Analyst]

How about interp2()? Or TriScatteredInterp()? Or, if you have the Image Processing Toolbox, you can use roifill().