Owning Palette: Numeric Functions
Requires: Base Development System
Computes the sum of the inputs.
If you wire two waveform values or two dynamic data type values to this function, error in and error out terminals appear on the function. You cannot add two time stamp values together. The dimensions of two matrices you want to add must be the same. Otherwise, this function returns an empty matrix. The connector pane displays the default data types for this polymorphic function.
x can be a scalar number, array or cluster of numbers, array of clusters of numbers, and so on.  
y can be a scalar number, a fixedpoint number, an array or cluster of numbers, an array of clusters of numbers, a time stamp, and so on.  
x+y is the sum of x and y.

When you wire matrix data as an input to this function, a VI that includes subVIs that work with the matrix data type replaces the function. The resulting VI has the same icon but contains a matrixspecific algorithm. The node remains a VI if you disconnect the matrix from the input(s). Wire other data types as inputs to restore the original function. If you wire a data type to a function and that data type causes a basic math operation to fail, the function returns an empty matrix or NaN.
You also can add two or more values using the Compound Arithmetic function.
The Add  Various Uses example VI at the bottom of the page shows how the Add function operates with different data types.
If you wire fixedpoint values to Numeric functions such as Add, Subtract, Multiply, and Square, the functions usually return values that do not lose any bits of word length. However, if the operation creates a value that exceeds the maximum word length that LabVIEW accepts, overflow or rounding conditions can occur. LabVIEW accepts a maximum word length of 64 bits. Use the Numeric Node Properties dialog box to configure how LabVIEW handles overflow or rounding of fixedpoint data.
Refer to the Numeric Functions VI in the labview\examples\Numerics directory for an example of using the Add function.