Name

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    SPRSADD

Purpose

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    Adds two sparse matrices (as generated by SPRSIN).

Category

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    Math

Calling Sequence

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    Result = SPRSADD(A,B)

Inputs

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    A: Sparse matrix to be added.
    B: Sparse matrix to be added.

Outputs

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    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.

Example

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    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

Modification History

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    Written by: Jeremy Bailin, November 2008