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

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,

Answer 1

[Shashank Prasanna]

what is:

>> class data_no

make sure it is double

[tafteh]

Hi SP, Thanks, I tried the following:

class(data_no)

and I get:

single

is there anyway to convert it to double class type?

[Shashank Prasanna]

you can just do:

d = double(data_no);

[tafteh]

cheers, it works.