how should I correctly use findpeaks() so that the output will not show me the following error

data=dlmread('Ge single crystal transmission.txt');

pks=findpeaks(data)

Error using findpeaks

Expected Y to be a vector.

Error in findpeaks>parse_inputs (line 191)

validateattributes(Yin,{'numeric'},{'nonempty','real','vector'},...

Error in findpeaks (line 134)

= parse_inputs(Yin,varargin{:});

please help me out. been stuck for days;(

PS: the version of matlab I used is R2016a

Answer 1

[Jesus Sanchez]

Data is a matrix of Nx2. You just need to select which vector you want to use to search for the peaks. I guess is the second one, while the first is X-values

data=dlmread('Ge single crystal transmission.txt');
pks=findpeaks(data(:,2))