Interpolate big array to match length of smaller array?

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Marissa Menzel
Marissa Menzel 2018-9-25
编辑： jonas 2018-9-25
I am trying to do some array math, but my arrays are different sizes. I tried to interpolate the larger array, tau, (13795 x 1) to match the length of the smaller one, rho, (105 x 1). Neither data set is linear. I tried to do 1D interpolation with interp1(...) function but got the following error: "error using GriddedInterpolant The grid vectors do not define a grid of points that match the given values"
My end goal is to get the longer tau array to be (105 x 1).
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Marissa Menzel
Marissa Menzel 2018-9-25
They are density (rho) and wind stress (tau) that I am reading in from a data table file.
jonas
jonas 2018-9-25
Measured over what? Over time? Over a geometry? Why are they different size?

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jonas
jonas 2018-9-25
编辑：jonas 2018-9-25
You need an x vector for interp.
tau_new=interp1(X_tau,tau, X_rho)
tau_new is the interpolated vector
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Marissa Menzel
Marissa Menzel 2018-9-25
I don't have an xshort and I can't just make one with linspace because it is non linear.
jonas
jonas 2018-9-25
编辑：jonas 2018-9-25
Can you upload and describe the data? You said you got the data from a table. What does the row number of the table represent? Is there a time associated with the values or perhaps a geometry? rho and tau must surely be functions of something right? Unless of course they are repeated measurements to get a measure of their distributions. In this case it is however senseless to interpolate.
Anyway, I am not supposed to figure it out.

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