how to interpolation from small matrix to large matrix.

how can I interpolation matrix from 7x7 to 70x70? otherwise, imresize is failed for major value in matrix 7x7. I confuse about interp2 that which will be the peaks or else.

M = [
26.6536850000000	26.2116960000000	25.7796660000000	25.5484060000000	25.3228370000000	25.0957440000000	25.0041480000000
28.4801820000000	27.9432550000000	27.4145080000000	27.2323110000000	27.0571170000000	26.8760090000000	26.6948490000000
29.9440660000000	29.4085810000000	28.8797540000000	28.6681150000000	28.4651270000000	28.2585010000000	28.1512510000000
31.4023710000000	30.8655880000000	30.3369250000000	30.0879120000000	29.8463940000000	29.6012150000000	29.5798550000000
32.8606770000000	32.3225940000000	31.7940950000000	31.5077100000000	31.2276610000000	30.9439290000000	31.0084580000000
35.3245990000000	34.9917560000000	34.6621570000000	34.3190500000000	33.9818450000000	33.6506420000000	33.5333720000000
37.8039920000000	37.6987970000000	37.5974040000000	37.2201680000000	36.8485640000000	36.4937550000000	36.1883560000000];

Answer 1

[Walter Roberson]

newM = imresize(M, [70 70]);

I just tried it and no error message was produced. You should explain further what "failed for major value in matrix" means to you.

Are you talking about the fact that imresize() is producing an maximum output that exceeds the maximum of the input? imresize() projects values based upon the local gradient, so it is normal for it to overshoot the peak and undershoot the smallest value.

[AniCnx]

It mean the values of 7x7 are not contained in 70x70. Example is 26.653685 in 7x7 is not appear in matrix 70x70.

[Walter Roberson]

newM = imresize(M, [70 70], 'bilinear');

The default is bicubic, which uses a 4 x 4 neighbourhood.

[AniCnx]

ok. I got it. it's about the number of the interval. Thanks for your comments.