How to plot PSD using data in excel?

The data time and amplitude values are in an excel file. From that I wanted to plot PSD, Y-axis amplitude. X-axis frequency.How can I do in this in Matlab?

Answer 1

[Murali Krishna]

try this...

 a=xlsread('test.xls','a1:a30');%time values
 b=xlsread('test.xls','b1:b30');%amplitude values
 plot(1/a,b);

test.xls is the excel file from which you have to read the data. you also have to specify the range of the data

[razin akmal]

it is not working. it just plot straight line graph as i wanted spectral graph.