How can I write an FIR filter function

Hi! I'm trying to write a function that performs FIR filtering without having to use the built-in function.

so I have this code at the moment.

function y = myFIR(x,h)

M = length(x);

L = length(h);

y = zeros(0,((M+L)-1));

for n = 1:M+1

for k = 1:L+1

Y1 = (h(k).*x(n-k));

y(n)= sum(Y1);

end

end

where (h) is an array consisting of the impulse response, (x) is an array consisting of the input sequence and (y) is a vector containing the filtered samples.

but I have been getting the error below;

Array indices must be positive integers or logical values.

Error in myFIR (line 7)

Y1 = (h(k).*x(n-k));

I have really tried everything I could but it just doesnt seem to go. I will really be glad if anyone can help figure out the problem.

Thank you.

[KALYAN ACHARJYA]

Can you define x and h inputs, examples?

[Aliyu Suleiman Liman]

Yh sure!

h = { 0.2 0.3 0.2}

x = {1 2 3 4 5 6 7 8 9 10}

Answer 1

[KALYAN ACHARJYA]

My suggestion to avoid the error, In the loop, during first iterations when when n=1 and k=1, then following statement

Y1 = (h(k).*x(n-k));

x(n-k) becomes x(0), which is not allowed in indexing vectors. x(Positives only)

[Aliyu Suleiman Liman]

I tried using (k=0:L) but I was still getting the same error