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

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tafteh
tafteh 2013-1-14
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,

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Shashank Prasanna
Shashank Prasanna 2013-1-14
编辑：Shashank Prasanna 2013-1-14
what is:
>> class data_no
make sure it is double
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