sgolayfilt function question ask

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Eula
Eula 2012-10-30
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
  1 个评论
Eula
Eula 2012-10-30
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

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回答（2 个）

Honglei Chen
Honglei Chen 2012-10-30
Do you have Signal Processing Toolbox installed? You can check if you have it by running
ver
Also, what does
which sgolayfilt
return?
Jan
Jan 2012-10-31
编辑：Jan 2012-10-31
You need either the Signal Processing Toolbox, or you can use the faster: FEX: fSGolayFilt.mex, which does not require the SPT.

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