| Variable | Meaning | Value |
|---|---|---|
| ia(_JT_ idim_) | leading dimension | 3 |
| ia(_JT_ nunk_) | number of unknowns | 2 |
| ia(_JT_ maxnz_) | maximum number of non-zero elements in any column | 4 |
This is the transpose of ELL storage. Here the coefficient is stored in an ia(_JT_ maxnz_) x ia(_JT_ nunk_) array, with main diagonal elements stored in the first row. A companion ia(_JT_ maxnz_) x ia(_JT_ nunk_) array maps the column in the reduced matrix to the column in the original matrix for each element.
would be represented in ELLT format by the arrays a and ja as follows:
Note that the main diagonal elements must be in the first row of array a.