Subscript indices must either be real positive integers or logicals.

x=[1 2 3 4];
h=[1 2 3];
m=length(x);
n=length(h);
OP_len=m+n-1;
less=OP_len-n;
Abs=h;
for Kk=1:less
Abs=[Abs,0];
end
Y=Abs.';
for jj=1:m   
temp=Abs(OP_len-1);
for kk=OP_len:-1:1
   Abs(kk)=Abs(Kk-1);
end
Abs(0)=temp;
Y=[Y,Abs.'];
end

Why I am getting "Subscript indices must either be real positive integers or logicals." Error

Error in LinConvolution (line 20)

Abs(Kk)=Abs(Kk-1);

Answer 1

[KALYAN ACHARJYA]

Abs(1)=temp;

In Matlab indexing start from 1, not zero

Hence

Allowed

A(1), A(2), A(3),....

Not Allowed

A(0), A(-1), A(-2),....etc

Answer 2

[the cyclist]

Unlike some other programming languages (e.g. python), MATLAB has 1-based indexing. The first element of the array A would be referenced as A(1), not A(0). So, if you try to access A(0), you will get that error message.