First: the shifting procedure is correct.

Second, the error lies in calling y=seqshift(x, n, 3) to return quantity selection, and calling stem(n, x) to select wrong horizontal and vertical scalars.

Revise as follows:

Initial sequence of% allocation

n = 0:9；

x 1 =)；

Title ('x (n)');

% painting shift sequence

);

Title ('x (n-3)');

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