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Array Size (G Dataflow)

Last Modified: January 12, 2018

Returns the number of elements in each dimension of an array.



An n-dimensional array of any type.

This input also accepts clusters containing a single array, such as waveforms. This input changes to waveform when the data type is a waveform.

Data Type Changes on FPGA




The waveform whose array of y values you want to use in this operation. This input becomes available when you wire a waveform to array.



The number of elements in the array.

This output returns different data types, depending on the dimension of the array:

  • One-dimension—This output returns a 32-bit integer.
  • Multidimensional—This output returns a 1D array in which each element is a 32-bit integer that represents the number of elements in the corresponding dimension of array.

Representation of Array Dimensions in the Output Array

For multidimensional arrays, the order of elements in the output array corresponds to row-major order. Thus, the first dimension in the input array always corresponds to the last element in the output array. The following table shows how output array elements correspond to input array dimensions for a 4D array.

Element in Output Array Corresponding Input Array Dimension Index Name
1 4th Volume
2 3rd Page
3 2nd Row
4 1st Column


The number of elements in the waveform's array of y values. This output becomes available when the input data type is a waveform.

Diagram Panel Indicator Comments
size(s) for 1D Array returns a scalar element with the size of the input array.
size(s) for 2D Array returns a 1D array where each element corresponds to the size of a dimension in the input array. The first element returns the number of rows in the input array, and the second element returns the number of columns in the input array.

Where This Node Can Run:

Desktop OS: Windows

FPGA: All devices (only within an optimized FPGA VI)

Web Server: Supported in VIs that run in a web application

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