.RI "With the definintions of the input and output variables:"
.br
.TP
.RI "datatype :: \fBa\fP"
The matrix a which should be inverted. The dimensions of matrix a must be set \fIBEFORE\fP with the methods \fBelpa_set\fP(3) and \fBelpa_setup\fP(3). The datatype of the matrix can be one of "real(kind=c_double)", "real(kind=c_float)", "complex(kind=c_double)", or "complex(kind=c_float)"
.TP
.RI "integer, optional :: \fBerror\fP"
The return error code of the function. Should be "ELPA_OK". The error code can be querried with the function \fBelpa_strerr\fP(3)
.RI "With the definintions of the input and output variables:"
.br
.TP
.RI "elpa_t \fBhandle\fP;"
The handle to the ELPA object
.TP
.RI "datatype *\fBa\fP;"
The matrix which should be inverted. The dimensions of the matrix must be set \fIBEFORE\fP with the methods \fBelpa_set\fP(3) and \fBelpa_setup\fP(3). The \fBdatatype\fP can be one of "double", "float", "double complex", or "float complex".
.RI "int *\fBerror\fP;"
The error code of the function. Should be "ELPA_OK". The error codes can be querried with \fBelpa_strerr\fP(3)
.SH DESCRIPTION
Inverts an upper triangular real or complex matrix. The functions \fBelpa_init\fP(3), \fBelpa_allocate\fP(3), \fBelpa_set\fP(3), and \fBelpa_setup\fP(3) must be called \fIBEFORE\fP \fBelpa_eigenvalues\fP can be called.