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Help needed please

My actual measurement Yt is a [4x1] matrix but Ht is [1x4] and Xt is [ 4x1] so how can I get all of these to agree in the equation:

xt = xt + K(Yt - Ht.Xt)

Ideally I'd like

(Yt - Ht.Xt)

[4x1] - [4x1]