linear interpolation using 2 arrays

I have two separate arrays containing two variables, t & T. I need to interpolate for a new set of T values using the relationship between t and T.

for k=1:length(t)
[t, index] = unique(t); 
tr_T = interp1(t,T(index),'linear'); %linear interpolation to find new T given t
end

However, the shape of the original T curve is not retained after I interpolate and derive the tr_T values. Any ideas?

[KSSV]

tr_T = interp1(t,T,'linear');

What does this give?

[jgillis16]

I've attached the plot. blue is the original T and the yellow curve is the interpolated T - did not work.

[Jan]

The "yellow" curve is red, isn't it?

The intention of the shown code is not clear. Calculating "[t, index] = unique(t)" repeatedly in each iteration does not change the result and tr_T is overwritten again and again.

What are the two arrays t and T? Why do you use the indices of the unique value of t to get values from T? This looks strange.

[jgillis16]

the color question - not necessary.

***written in the next cell - both t and T are arrays on the order of ~6400 cells.

t = time; T = temperature.