Resample issue with findpeaks

Hi,

I'm not sure what the issue is so I will post the code and hopefully someone knows what's going on. :D

x = 1:numel(y);  y = data;

   xx = 1:2:numel(y);
   yy = spline(x,y,xx);

I want to resample the data then use the spline function and then use findpeaks do find maximum values. Here is the problem:

Let's say I plot(xx) or plot(yy). It only shows 50 values. If I plot (xx,yy) I get 100 values. This issue is messing up the locations and values of the peaks...I'm not sure how to solve this. Does that make sense?

Thanks you for any suggestions!

[Walter Roberson]

Please show size(xx) and size(yy)

Answer 1

[per isakson]

"Let's say I plot(xx) or plot(yy). It only shows 50 values. If I plot (xx,yy) I get 100 values." If size(xx) and size(yy) both are [1,50] then

    plot( xx, yy, 'd' )

should give 50 points. However,

    plot( [ xx, yy ], 'd' )

will give 100 points