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How to use filter() if I don't have the transfer function?

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I have been provided with an impulse response h (vector of length 3) and an input signal x (vector of length 10).
I need to use the filter() function to perform FIR filtering on the input, but the function requires a transfer function as arguments:
From the documentation:
"y = filter(b,a,x) filters the input data x using a rational transfer function defined by the numerator and denominator coefficients b and a."
How do I get values for a and b so that I can use the function?

Accepted Answer

Mathieu NOE
Mathieu NOE on 17 May 2021
you have a FIR filter , and in that case the numerator b is equal to the h impulse response coefficients
the denominator a is equal to 1
Mathieu NOE
Mathieu NOE on 17 May 2021
I'm talking about this b and a : "y = filter(b,a,x)
and b = [0.2 0.3 0.2
a = 1

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