Jump to navigation Jump to search
|Computes a sparse or full identity matrix|
|Other toolboxes required||none|
|Function category||Helper functions|
|This is a helper function that only exists to aid other functions in QETLAB. If you are an end-user of QETLAB, you likely will never have a reason to use this function.|
iden is a function that computes the identity matrix of the desired size, which is either full or sparse.
- ID = iden(DIM,SP)
- DIM: The number of rows (or equivalently, columns) that ID will have.
- SP: A flag (either 1 or 0) indicating whether ID should or should not be sparse.
Full and sparse versions of the 2-by-2 identity matrix:
>> iden(2,0) ans = 1 0 0 1 >> iden(2,1) ans = (1,1) 1 (2,2) 1
Click here to view this function's source code on github.