4 New Ways to Use Array Notation: Copying or Transposing

par Janet Albers | Mis à jour le : 07/21/2015 | Commentaires : 0

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OS 28

Copying or transposing has become easier with OS 28 (CR6 OS 1). This new operating system enables you to copy portions of an array to a new location, such as when transposing rows and columns.

In this example we start with A(3,2) (3 rows, 2 columns) initialized as

1 2
3 4
5 6

and transpose it to At(2,3)  (2 rows, 3 columns)

1 3 5
2 4 6

You can do this by writing a program like this:

Public A(3,2) = {1,2,3,4,5,6}
Public At(2,3)
Dim i
	Scan (1,Sec,0,0)
		For i = 1 To 2
		'for each column of the source array A()
		'copy the column into a row of the destination array At()
			At(i,-1)() = A(-1,i)()
		Next i

To use the new capability of OS 28 (CR6 OS 01) most effectively, there are some rules for you to keep in mind:

  • An empty set of parentheses designates an array-assigned expression. For example, reference array() or array(A,B,C)().
  • Only one dimension of the array is operated on at a time.
  • To select the dimension to be operated on, negate the dimension of index of interest. For example, to operate on the dimension “B,” the syntax is array(A,-B,C).

Note: This new syntax does not affect how repetitions within instructions write to, or read from, variable arrays. To see how to use array notation and repetitions within measurement instructions, watch the “CRBasic | Advanced Programming” video. 

Tip: After updating your operating system, it’s a good idea to check your existing programs to ensure they continue to run as expected.

For more information about, and examples of, multi-dimensional arrays, we have several resources to help you. You can search for the section in your data logger manual titled “Array-Assigned Expression.” The CRBasic Editor Help application in LoggerNet is also a good resource. For example, search for “multi-dimensional arrays”:

Multi-dimensional arrays

Recommended for You: To learn more about OS 28, review the “Powerful New Operating System for CR800, CR1000, CR3000” newsletter article.

Campbell Scientific’s newest data logger operating system (OS 28 for the CR800CR1000, and CR3000; OS 01 for the CR6 datalogger) enables you to use Array Notation in CRBasic multi-dimensional arrays in new ways. This article explored one of these methods—copying or transposing. Three other methods, simple scalinginitializing multi-dimensional arrays, and complex scaling, were discussed in the first three articles in this series. This article concludes the series.

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A propos de l'auteur

janet albers Janet Albers est rédactrice technique senior. Elle vous fera part de ses conseils, simplifiera les concepts et vous guidera vers un projet réussi. Elle est à Campbell Scientific, Inc depuis plus longtemps que la CR1000, mais pas depuis aussi longtemps que la CR10X. Après les heures de travail, Janet aime le plein air avec ses garçons et ses chiens.

Voir tous les articles de cet auteur.


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