interpolation shorter vector using a longer vector?

Question

Fredrick 2014-7-18

0
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https://ww2.mathworks.cn/matlabcentral/answers/142459-interpolation-shorter-vector-using-a-longer-vector

回答： Fredrick 2014-7-18

Hi all, I have a data set which I need to add latitude longitude values to. I am using time in Julian day from the start of the year the data was collected. The format is:

mat1 = < 4244x1 double > julian day min 110.7598 max 110.8159
mat2 = < 2461x1 double > julian day min 110.7593 max 110.8162
mat3 = < 2461x1 double > latitude
mat4 = < 2461x1 double > longitude

I want to match lat lon onto mat 1 using julian day.

interplat = interp1(mat1,mat2,mat3);

Using the above I get error that vectors are not same length. If I make mat2,3,4 the same as mat1 by adding more data that is outside the time span of mat1 I get all NaN in the output.

Please help!!!

best,

Fred