math/

sprsadd.pro

top source sprsadd

Math

result = sprsadd(a, b)

Adds two sparse matrices (as generated by SPRSIN).

Return value

The addition of the matrices, in sparse format. This is functionally equivalent to: SPRSIN(FULSTR(A) + FULSTR(B)) but can be used even when the full matrices take up too much memory for that operation.

Parameters

a in: Sparse matrix to be added.
b in: Sparse matrix to be added.

Examples

    IDL> a = sprsin([[1,0,0],[0,1,0],[0,0,1]])
    IDL> b = sprsin([[0,0,2],[0,2,0],[2,0,0]])
    IDL> c = sprsadd(a,b)
    IDL> print, fulstr(c)
          1.00000      0.00000      2.00000
          0.00000      3.00000      0.00000
          2.00000      0.00000      1.00000

Author information

History:: Written by: Jeremy Bailin, November 2008

File attributes

Modification date:	Wed Apr 15 16:08:00 2009
Lines:	82

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