Array Functions 1.2 2004/06/18 11:02:42 GMT-5 2007/07/19 09:55:25.090 GMT-5 National Instruments certification@ni.com National Instruments certification@ni.com Elizabeth Gregory elizabeth.gregory@gmail.com Malan Shiralkar mshiralkar05@hotmail.com Harika Basana ilsai@rice.edu array Array Functions functions LabVIEW National Instruments In this section, you will learn about Array Functions. Use the Array functions located on the Functions>>All Functions>>Array palette to create and manipulate arrays. The more commonly used array functions include the following: Array Size Returns the number of elements in each dimension of an array. If the array is n-dimensional, the size output is an array of n elements. For example, the Array Size function returns a size of 3 for the following array. 7 4 2 Initialize Array Creates an n-dimensional array in which every element is initialized to the value of element. Resize the function to increase the number of dimensions of the output array. For example, the Initialize Array function returns the following array for an element of 4, a dimension size of 3, and one dimension size terminal. 4 4 4 Array Subset Returns a portion of an array starting at index and containing length elements. For example, if you use the previous array as the input, the Array Subset function returns the following array for an index of 2 and a length of 3. 2 4 4 Build Array Concatenates multiple arrays or appends elements to an n-dimensional array. Resize the function to increase the number of elements in the output array. For example, if you concatenate the two previous arrays , the Build Array function returns the following array. 7 4 2 4 4 4 To concatenate the inputs into a longer array of the same dimension as shown in the following array, right-click the function node and select Concatenate Inputs from the shortcut menu to create the following array. 7 4 2 4 4 4 Index Array Returns the element or sub-array of n-dimension array at index. For example, if you use the previous array as the input, the Index Array function returns 2 for an index of 0. You also can use the Index Array function to extract a row or column of a 2D array to create a subarray of the original. To do so, wire a 2D array to the input of the function. Two index terminals are available. The top index terminal indicates the row, and the second terminal indicates the column. You can wire inputs to both index terminals to index a single element, or you can wire only one terminal to extract a row or column of data. For example, wire the following array to the input of the function. 7 4 2 4 4 4 The Index Array function returns the following array for an index (row) of 0: 7 4 2