Using Array Parameters within Conditional Expressions

When you use array parameters in calculations, you must consider the following:

• Array functions do not support array slices. You must use either a single element of the array or the entire array.

• Elements of multi-dimensional arrays can be referenced as array[i][j] or as array[i, j].

• An array can be used as an argument to any operator or function. The operator or function is applied to each element of the array and an array of the same size is returned. If multiple arrays are used as arguments, they must all be the same size and shape. For example, to normalize all elements of an array, enter the following:

  dy = dy - mean(dy)

In the following figure an array parameter called dy is used in a calculation:

• You can pass only one array parameter to a statistical function, such as sum(dy). You can pass multiple scalar variables, such as $sum(s1,s2,s3,\dots )$.

• Only arrays of numeric data type (real, integer) are available for use in calculations.

• The following statistical functions have special behavior when they pass one array as an argument. Instead of acting separately on each element of the array, the functions build a single result from the values of all array elements. These functions can take a 1D vector or a 2D matrix (or higher dimensional array). All array elements are processed as if the whole array was flattened to a single vector.

  sum	Sum of all elements of the array.
  min	Minimum value of all elements in the array.
  max	Maximum value of all elements in the array.
  mean	Mean value of all elements in the array.
  stddev	Standard deviation of all array elements from the mean.
  absSum	Sum of the absolute values of all elements in the array.
  absMax	Maximum of the absolute values of all elements in the array.
  absMin	Minimum of the absolute values of all elements in the array.

• The following functions also take an array as an argument and return information about that array:

  maxIdx	Index of the maximum value in a 1D array.
  minIdx	Index of the minimum absolute value in a 1D array.
  absmaxIdx	Index of the maximum absolute value in a 1D array.
  absminIdx	Index of the minimum absolute value in a 1D array.
  size	Returns the total number of elements in the array. Works for single and multi-dimensional arrays.
  dim (array, dimension)	Returns the size of a single dimension of a multi-dimensional array. Dimensions are counted starting at 1, so dim (table, 1) is the number of rows, and dim (table, 2) is the number of columns.