Shift in C++

[Kristof Timmermans]

Hello,


does anyone know if there is a command to shift a rowvector in C++ (just
like the octave command shift) that I can use?

I have written two functions to shift left and right. The function look
similar but there is a great speed difference between the two:

shift_left:

for (int i = 0; i < inputvector.length(); i++)
{...
    retval(i) = retval(i+1);
}


shift right:

for (int i = inputvector.length() i > 0; i--)
{...
    retval(i) = retval(i-1);
}

To shift left, there is no problem, but when I shift to the right, it
goes very slow...anyone an idea?

Greetz

Kristof



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