dlmread error when performing fourier transform (FFT)

I am attempting to perform a FFT with this data, but get this dlmread error.

How can I fix this?

[VBBV]

use readtable or readmatrix functions instead of csvread

Answer 1

[Star Strider]

You could use the deprecated csvread function, however readmatrix is preferred, since the data are numeric and the variable names do not convey any useful information (if they did, readtable would be preferable).

The sampling interval appears to be 0.001, so the sampling frequency will be 1000 and the Nyquist frequency 500.