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. | |