interp1 for matrix
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Heidi Hirsh
am 24 Aug. 2019
Kommentiert: Heidi Hirsh
am 25 Aug. 2019
I have two velocity matrices that I want to interpolate onto a new time vector. The matrices are both 8011x60 doubles where the rows are different times and the columns are depths. Can I use interp 1 to interpolate each row onto the new time?
This is how I have it set up now (how I would use interp1 if U and V were vectors):
I took a screenshot of my workspace too if that helps.
U_new = interp1(Date,U,M1time);
V_new = interp1(Date,V,M1time);
Temp_new = interp1(Date,Temp,M1time);
2 Kommentare
dpb
am 24 Aug. 2019
Did you not try it? There's an example in the documentation precisely the usage to interpolate arrays by column to a common set of query points...
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darova
am 24 Aug. 2019
You have to make the same number of rows for Date and U
U_new = interp1(Date,U,M1time);
% size(Date): 8013x1
% size(U): 8011x60
Didn't you get an error about size match?
Weitere Antworten (1)
Walter Roberson
am 24 Aug. 2019
No you should use interp2 for this. The value to look up depends on two factors, depth and time, but interp1 would only take one factor into account.
2 Kommentare
dpb
am 24 Aug. 2019
Hmmmm, Walter. I don't see what you're seeing--just that wants to interpolate onto a new time vector the two arrays. Altho I see the reference to the depth being what the columns of the array refer to I didn't see and his example code doesn't seem to want to do more than just those onto the Mitime vector.
Guess we'll find out if OP comes back... :)
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