sgolayfilt function question ask

I use the function "sgolayfilt" to filter my data.

filter_grade=sgolayfilt(grade,4,41); The grade is 11925*1 double data.

But the result shows "??? Undefined function or method 'sgolayfilt' for input arguments of type 'double'". What should I do?

Thanks, Joanne

[Eula]

I typed "which sgolayfilt" and it shows 'sgolayfilt' not found. Does this mean I do not have Signal Processing Toolbox installed? How can I install the Signal Processing Toolbox? Should I pay for that?

Thanks, Joann

Answer 1

[Honglei Chen]

Do you have Signal Processing Toolbox installed? You can check if you have it by running

ver

Also, what does

which sgolayfilt

return?

Answer 2

[Jan]

You need either the Signal Processing Toolbox, or you can use the faster: FEX: fSGolayFilt.mex, which does not require the SPT.