peak finding of a graph

I am attaching the x and y data vector here. Whenever I am using findpeaks command for findind the peaks

x=V1_1_new

y=y1_1_new

findpeaks(y1_1_new,V1_1_new)

I am getting this error

Error using findpeaks

Expected X to be increasing valued.

Error in findpeaks>parse_inputs (line 215)

validateattributes(Xin,{'double'},{'real','finite','vector','increasing'},'findpeaks','X');

Error in findpeaks (line 134)

= parse_inputs(Yin,varargin{:});

How can I solve this error

Answer 1

[KSSV]

load("matlab_peak.mat") ; 
x=V1_1_new ; 
y=y1_1_new ; 
[pks,idx] = findpeaks(y) ; 

plot(x,y) 
hold on
plot(x(idx),y(idx),'*r')

[ARPITA MONDAL]

Thanks a lot. it has solved my problem.

Now, I am getting 7 peaks here. But If I wanted more peaks(11 peaks) ,Then what should I do?

x= V1_1_new is the voltage value in volt.

In x vs y plot if I want peak in every 30mv distance then what should I do

Answer 2

[Serhii Tetora]

x=V1_1_new;
y=y1_1_new;

[pks, locs] = findpeaks(y);
plot(x,y,x(locs),pks,'o')