use matlab to plot fft from excel sheet

Hi

how do i plot fft from excel sheet data?

here are my codes:

Fs=20;
Ts=1/Fs;
t=0:Ts:1;
T=readtable("readings.xls");

Warning: Column headers from the file were modified to make them valid MATLAB identifiers before creating variable names for the table. The original column headers are saved in the

VariableDescriptions property.

Set 'PreserveVariableNames' to true to use the original column headers as table variable names.

>>start=T(A2);

Unrecognized function or variable 'A2'.

>>startpoint=xlsread("readings.xls",A2);

Unrecognized function or variable 'A2'.

Can I ask how to set the starting point using datas from my excel sheet? (to plot fft)

Thanks in advance!

Answer 1

[KSSV]

It looks like there is no variable name A2 in the table. Try using:

T.(1), T.(2) etc...or check the variablenames by printing the table or using the below line:

T.Properties.VariableNames % T is the table variable