how extract two arrays in matlab of unequal length

I have datasets of unequal length, like data file 1 has 47 data points and data file 2 has 649 data points , now i want diffence of these two curves, but I am looking for options , how to extract them.

I am attaching image of the plots.

please guide.

Regards,

Iqra

[Rik]

I recovered the removed content from the Google cache (something which anyone can do). Editing away your question is very rude. Someone spent time reading your question, understanding your issue, figuring out the solution, and writing an answer. Now you repay that kindness by ensuring that the next person with a similar question can't benefit from this answer.

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[Matt J]

Yes interp1 to sample the curves at corresponding points. Then you can subtract them freely.

[Matt J]

That shouldn't matter. You can interpolate at the same set of query points Xq,

result = interp1(X1,Y1,xq) - interp1(X2,Y2,xq)