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use matlab to plot fft from excel sheet

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Tam Li Na
Tam Li Na 8 Nov 2019
Answered: KSSV 8 Nov 2019
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!

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KSSV
KSSV 8 Nov 2019
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

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