Interpolating 2D matrix

I am trying to interpolating the matrix below. I would like to end up with an n by 3 matrix, and so my interpolation needs to be done row-wise

matrix = [221 188 0
    215 201 0
    210 213 0
    197 231 0
    162 236 0 
    125 225 0
    78 199 0
    74 196 0 
    49 144 48 
    46 125 83
    44 93 127
    50 48 173
    57 0 202 
    60 0 216];

[Star Strider]

The second column is not monotonically increasing. If I understand correctly what you want to do, that is going to cause problems for the MATLAB interpolation functions.

[Jim Parsons]

Assuming that it can be made monotonic, how would I proceed ?

[Star Strider]

Making the second column monotonic would necessarily make the first column non-monotonic. The second column also has duplicate values in the last two rows (as depicted in your Question), again destroying the monotonicity of the column.

I see no specific solution.

Answer 1

[Matt J]

INTERP1 will do column-wise interpolation. You can apply it to the transpose of your matrix.

[Jim Parsons]

Thanks Matt J and Star Strider, with a few adjustments and using interp1 it worked.

[Matt J]

Glad to hear, but please click "Accept" if that's the case.