name.iF

Program

HFRQ

; program control IP KPRIN KOUT IVL IVU ; optional real parameters RP AMPL ; end of input data EN EN

$\mathtt{KPRIN}$	The key of header printout.
	$=0$	without header
	$=3$	with header
$\mathtt{KOUT}$	The key of output.
	$=0$	all requested frequencies (i.e., $\mathtt{NROOT}$ frequencies)
	$=1$	all requested frequencies and eigenvectors
	$=2$	all requested frequencies and selected eigenvectors in order from $\mathtt{IVL}$ to $\mathtt{IVU}$ $(1\le\mathtt{IVL}\le\mathtt{IVU}\le\mathtt{NROOT})$
$\mathtt{IVL}$	The index of the first eigenvector to output.
$\mathtt{IVU}$	The index of the last eigenvector to output.
$\mathtt{AMPL}$	The amplitude of the eigenvector $[\text{m}].$ The default value is $1.$ The largest nodal deflection is normalized, not the eventual rotation.