Converting Time vs Voltage to Frequency vs Voltage

I have an excel sheet containing the time in first column and voltage in second column for a filter.

I would like to plot this data in the form of Frequency vs Voltage ie the voltage given in the excel sheet.

How can I do this in MatLab?

[KSSV]

What is time in the first column?

Answer 1

[Star Strider]

Use the xlsread function to import your data into your MATLAB workspace.

See the documentation for fft (link), specifically the code between the first (top) two plot figures.