Iden
| iden | |
| Computes a sparse or full identity matrix | |
| Other toolboxes required | none |
|---|---|
| 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.
Syntax
- ID = iden(DIM,SP)
Argument descriptions
- 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.
Examples
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
Notes
This function is only meant to simplify code within other functions. If you always want either the full or the sparse identity matrix, just use MATLAB's built-in eye or speye function.