NGX

NGX = [integer]
Default: NGX = set in accordance with PREC and ENCUT

Description: NGX sets the number of grid points in the FFT-grid along the first lattice vector.

By default NGX is set in accordance with the requested "precision" mode (PREC) and the plane wave kinetic energy cutoff ENCUT:

PREC	NGX
Normal	3/2×[math]\displaystyle{ G_{\rm cut} }[/math]
Single (VASP.5)	3/2×[math]\displaystyle{ G_{\rm cut} }[/math]
Single (VASP.6)	2×[math]\displaystyle{ G_{\rm cut} }[/math]
SingleN (VASP.6)	3/2×[math]\displaystyle{ G_{\rm cut} }[/math]
Accurate	2×[math]\displaystyle{ G_{\rm cut} }[/math]
Low	3/2×[math]\displaystyle{ G_{\rm cut} }[/math]
Medium	3/2×[math]\displaystyle{ G_{\rm cut} }[/math]
High	2×[math]\displaystyle{ G_{\rm cut} }[/math]

where

[math]\displaystyle{ E_{\rm cut}=\frac{\hbar^2}{2m_e}G_{\rm cut}^2 }[/math]

with [math]\displaystyle{ E_{\rm cut} }[/math]=ENCUT.

Alternatively, set NGX to a specific value in the INCAR file.

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