How to filter a single column mat with Gaussian in OpenCV

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I have mat with only one column and 1600 rows. I want to filter it using a Gaussian.

I tried the following:

Mat AFilt=Mat(palm_contour.size(),1,CV_32F);
GaussianBlur(A,AFilt,cv::Size(20,1),3);

But I get the exact same values in AFilt (the filtered mat) and A. It looks like GaussianBlur has done nothing.

What's the problem here? How can I smooth a single-column mat with a Gaussian kernel?

I read about BaseColumnFilt, but haven't seen any usage examples so I'm not sure how to use them.

Any help given will be greatly appreciated as I don't have a clue.

I'm working with OpenCV 2.4.5 on windows 8 using Visual Studio 2012.

Thanks

Gil.