Overwriting a part of an array

I have arrays of fixed size, and starting at a fixed location, I want to overwrite the values in the array with values of another array of variable length.

For example:

A = [1 3 4 2 6 7 4 6 7]

B1 = [9 8 5]

B2 = [5 5 4 3]

I want to overwrite the values in A, starting at position 2, with the values of B. (B is always shorter than A) This would yield:

C1 = [1 9 8 5 6 7 4 6 7]

C2 = [1 5 5 4 3 7 4 6 7]

One way to achieve this is:

C1 = A;

C1(2:1+size(B1,2)) = B1;

I was wondering if there is a more direct/elegant way, that doesn't require the size(B1,2) parameter?

Answer 1

[KSSV]

C1 = A;
C1(2:1+length(B1)) = B1;

You have to mention the indices where you are replacing, so you are bound to use size/ length.

[Laura Echeverri Zea]

hello, i have question, wht is i what to replace just a value and my matrix is zeros's matrix... for example

med=5

X=3

A=zeros(1,med)

and i want to change only X in the position (1,3) and save that value