Where Construct

• there is a block form of masked assignment:

    WHERE(A > 0.0)
     B = LOG(A)
     C = SQRT(A)
    ELSEWHERE
     B = 0.0
    ENDWHERE

• the mask must conform to the RHS of each assignment; A, B and C must conform;
• WHERE ... END WHERE is not a control construct and cannot currently be nested;
• the execution sequence is as follows: evaluate the mask, execute the WHERE block (in full) then execute the ELSEWHERE block;
• the separate assignment statements are executed sequentially but the individual elemental assignments within each statement are (conceptually) executed in parallel.

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