what is the best possible way to find the missing values using interpolation

Hi all,

i have an array that is measured in a hour interval.

ex) a_1_hour = [ 1 5 9 13 17 21 ]

but i wish to find out how the values would be if it was a measurement taken in 15-minutes interval.

ex) a_15_min = [ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 ]

I have presented a linear increase for the sake of easy demonstration. However, the actual values do not increase/decrease linearly.

What is the best possible way to interpolate the unknow 15-minutes interval values?

thanks

[Star Strider]

Follow the examples in the retime function documentation.

Answer 1

[Stephen23]

>> a60 = [1,5,9,13,17,21];
>> t60 = 60*(0:numel(a60)-1);
>> t15 = t60(1):15:t60(end);
>> a15 = interp1(t60,a60,t15)
a15 =
    1    2    3    4    5    6    7    8    9   10   11   12   13   14   15   16   17   18   19   20   21