findpeaks: Error using findpeaks (line 43) Input arguments must be 'double'.

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Hi all,
I am recording a Blood Volume Pulse signal and willing to find the indexes of its local maxima. The data (Blood Volume Pulse signal) is a two column matrix, signal magnitude and the corresponding time value.
data_no = data(:,1);
Using findpeaks(data_no) I get the following error:
Error using findpeaks (line 43)
Input arguments must be 'double'.
I appreciate if anyone help me understanding this error!
Thanks,

Accepted Answer

Shashank Prasanna
Shashank Prasanna on 14 Jan 2013
Edited: Shashank Prasanna on 14 Jan 2013
what is:
>> class data_no
make sure it is double
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