Interpolate non-unique values

I have two vectors for a symmetrical flyover to compute an aircraft noise footprint:

pressure = [0 0.5 1 2 4 2 1 0.5 0]
tUnequal = [4 4.3 5 6 6.3 7 7.13 9]

I want to interpolate that symmetric pressure vector for an evenly spaced time like:

tEqual = [4 5 6 7 8 9].

Interp1 does not work in this case due to the symmetry of the pressure vector:

Error using griddedInterpolant 
The grid vectors must contain unique points.

Any suggestions?

[Matt J]

In what way does it "not work"?

[mldmnn]

Error using griddedInterpolant 
The grid vectors must contain unique points.

Answer 1

[Matt J]

This might be what you want

>> pressureEqual=interp1(tUnequal, pressure(1:length(tUnequal)), tEqual)

pressureEqual =

           0    1.0000    2.0000    2.0000    0.7674    0.5000

[mldmnn]

Thanks!