Matlab function 'movmean' doesn't work on simulink

2022 1 6
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更新时间：2025 12 22
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I'm designing movmean function on simulink using Matlab function block
And when i try to test the block by inputing timeseries data, the input and output of 'movmean' function is same.
I attach pics below
1) Moving Average function block
2) code of Moving Average block
3) input and output of Moving Average block (output is not computed well)

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回答（1 个）

Walter Roberson
Walter Roberson 2025-12-22

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This is expected if the input data is scalar (not a 1 x N or N x 1 vector or 2D array.)
Simulink feeds scalar signals to MATLAB Function Blocks one sample at a time. The moving mean of a scalar alone is the same scalar back again.
Simulink does not keep a history of all the (individually scalar) signals that have gone before, and feed the entire time history into a MATLAB Function Block.
One way to achieve the desired behaviour, is to use a DSP "buffer" block https://www.mathworks.com/help/dsp/ref/buffer.html with the overlap set to one less than the buffer size, and feed the output of the buffer block to a mean block (not a movmean block)
I suspect there might also be methods that involve transfer functions.

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