MATLAB: Interpolation of data 2 vectors

interpolateinterpolation

hi i have trouble interpolate

Y=1945 1946 1947 1948 1949 1950 1951 1952 1953

L=6937 6976 6987 7015 9999 9999 6921 6958 6936

how I can interpolate these values of the year 1949 and 1950? and replace it in the L values. I know is a "for" but i dont know how implement it

Best Answer

Remove the points with bad data . interp1() the points back in

interp1(Y2, L2, [1949 1950])

Related Solutions

MATLAB: Help I keep getting error: [Error using griddedInterpolant The grid vectors must contain unique points]

Your grid data points are not unique (which they must be to perform interpolation):

>> U = unique(X(:));
>> C = hist(X(:),U);
>> U(C>1)
ans =
     408
     897
    4960
    5319
   13890
   14208
   14642
   14994
   15750
   16265
   16624
   16977
   18177
   18611
   19463
   20082
   20298
   20829
   23927
   24075
   24950
   25451
   26379
   26744
   26962
   27115
   28517

MATLAB: PCHIP and SPline error

Hi Robbie,

We don’t have statistical error bounds for interpolation, as the interpolation functions takes in the query points and fits a curve. This answer explains the concept in detail.

Whereas, when you use the interp function which uses a low-pass filter for interpolation, that will also change the y-value at the sample points. This gives rise to a difference which we can quantify as the interpolation error. You can refer to this answer which gives a way to quantify the error vector.

So when you say interpolation error, I assume that you are trying to calculate the error between the interpolated values of spline interpolation and PCHIP interpolation, if that is the case you can calculate that as shown below,

error = Fl - Fl_pc;

Kiran Felix Robert

Best Answer

Related Solutions

MATLAB: Help I keep getting error: [Error using griddedInterpolant The grid vectors must contain unique points]

MATLAB: PCHIP and SPline error

Related Question