Vibration input parameters
A fast and precise DFT wavelet code
(Redirected from Input.freq)
This is to be used with the vibration calculation program frequencies.
The ’input.freq’ file
There are three parameters:
- ’Failed to parse (PNG conversion failed; check for correct installation of latex and dvipng (or dvips + gs + convert)): \mathbf{\alpha_{freq}}
’ to determine the step for frequency step (i.e. Failed to parse (PNG conversion failed; check for correct installation of latex and dvipng (or dvips + gs + convert)): \alpha_{freq}\times
hx, Failed to parse (PNG conversion failed; check for correct installation of latex and dvipng (or dvips + gs + convert)): \alpha_{freq}\times hy, Failed to parse (PNG conversion failed; check for correct installation of latex and dvipng (or dvips + gs + convert)): \alpha_{freq}\times hz);
- ’Failed to parse (PNG conversion failed; check for correct installation of latex and dvipng (or dvips + gs + convert)): \mathbf{n_{freq}}
’ which determines the order of the finite difference scheme:
- -1 calculates Failed to parse (PNG conversion failed; check for correct installation of latex and dvipng (or dvips + gs + convert)): \frac{f(x_0)-f(x_0-h)}{h}
- 1 calculates Failed to parse (PNG conversion failed; check for correct installation of latex and dvipng (or dvips + gs + convert)): \frac{f(x_0+h)-f(x_0)}{h}
- 2 calculates Failed to parse (PNG conversion failed; check for correct installation of latex and dvipng (or dvips + gs + convert)): \frac{f(x_0+h)-f(x_0-h)}{2h}
(this is the default);
- 3 calculates Failed to parse (PNG conversion failed; check for correct installation of latex and dvipng (or dvips + gs + convert)): \frac{f(x_0+2h)+f(x_0+h)-f(x_0-h)-f(x_0-2h)}{6h}
.
- ’Failed to parse (PNG conversion failed; check for correct installation of latex and dvipng (or dvips + gs + convert)): \mathbf{m_{freq}}
’ which determines the method (only 1 at the present stage).
Example
1/64 #frequency step = alpha*hx, alpha*hy, alpha*hz 2 #order finite difference scheme (-1, 1, 2 or 3) 1 #1 - systematic moves over each atoms