I am sorry, but I do not understand the general algorithm that you want to apply. If you want to use the value m to determine the number of elements to copy, then perhaps the following statements will help:
/* subtract Y[1] from elements m+1,m+2,...,2*m+1 and copy those
values into elements 1,2,...,m+1 */
Y1 = y[1];
idx = 1:(1+m);
Y[idx] = Y[m+idx] - Y1;
If that is not what you want, please explain and provide an example.
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