Using 'single' arrays with the "filter" command

2012 11 19
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We have to minimize our application's memory footprint and execution time, so I'm trying to move from "double" data arrays to "single" data arrays. The problem is that the "filter" command appears to return "double" filter states. Is there a way to use "single" data with the filter or even the "conv" command?

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Matt J
Matt J 2012-11-19
编辑：Matt J 2012-11-19
if your inputs are single, so should the output be.

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Jonathan Sullivan
Jonathan Sullivan 2012-11-19

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Make sure all your inputs to filter are singles.
Here's an example for a simple moving average:
x = rand(100,1,'single');
a = ones(1,10,'single')/single(10);
b = single(1);
xf = filter(a,b,x);
class(x)

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Jim Clay
Jim Clay 2012-11-20
I have done that, but the second output, the final filter state, is still double.

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Jan
Jan 2012-11-20
编辑：Jan 2012-11-20

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See: FEX: FilterM, which accepts singles also.
Do you mean the 2nd output of filter with "double filter states"?

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Jim Clay
Jim Clay 2012-11-20
Yes, I mean the 2nd output of filter. I will check out the FilterM command.

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Jim Clay
Jim Clay
2012-11-19

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