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Resample issue with findpeaks

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Matlabbey
Matlabbey 2012-8-15
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!

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回答（1 个）

per isakson
per isakson 2012-8-16
编辑：per isakson 2012-8-16
"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

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