How can i remove noise from graph with slope wave

Hey,

i have got a graph that looked like the figure below.

I want to filtered it by using matlab but so far i didn't succseed beacuse there is a noise that can be in values of +5000 and can also be in values of 30

In addition to that could be noise in -5 but in the begging of the graph.

Any suggstions ?

Thanks!

Answer 1

[KALYAN ACHARJYA]

if you have certain threshold value, you can remove that from y data.

threshold_data=...??
idx=find(y>threshold_data)
y(idx)=[];
x(idx)=[];
%plot the data

Answer 2

[Image Analyst]

Did you try calling rmoutlier() before calling polyfit() or however you did the "filter"?

If you need more help, attach your data and code to read it in.