How can I write a matlab program to do fft of a signal which I am gettig from a hot wire anemometer in the form of excel file.

I want to write the program in MATLAB to do FFT of the signal which I am getting from hot wire anemometer. The signal is in the form of excel file having time in first column and velocity in second column.

I have written this and getting error

>> [X,B] = xlsread(data.xls’);
xdft = fft(X(:,2));
   % sampling interval -- assuming equal sampling
   DT = X(2,1)-X(1,1);
   % sampling frequency
   Fs = 1/DT;
   DF = Fs/size(X,1);
   freq = 0:DF:Fs/2;
   xdft = xdft(1:length(xdft)/2+1);
   plot(freq,abs(xdft))
??? [X,B] = xlsread(data.xls’);
                            |
Error: Missing variable or function.

[dpb]

 [X,B] = xlsread(data.xls’);

Unbalanced quotes in filename; use single quotes--

 [X,B] = xlsread('data.xls');