Acta Numerica 1997: Volume 6 by Arieh Iserles

By Arieh Iserles

Acta Numerica surveys every year crucial advancements in numerical research. the topics and authors, selected through a exotic overseas panel, offer a survey of articles striking of their caliber and breadth. This quantity comprises articles on multivariate integration; numerical research of semiconductor units; quickly transforms in utilized arithmetic; complexity concerns in numerical research.

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Five [1] FALSE TRUE TRUE TRUE TRUE Another type of vector that R supports is a logical vector. The elements in a logical vector are either TRUE or FALSE (R requires these be in all uppercase). To differentiate logical vectors from character vectors, there are no quotes around TRUE and FALSE when they are used as values. 16 also shows an example creating a logical vector and assigning that vector to an object called l o g i c a l . vector. While the c() function can be used to create a logical vector, they are more often generated through the use of conditional statements.

Packages () function is used. If this is the first time a package is installed, after executing i n s t a l l . packages ( ) , a list of all of the CRAN mirror sites will be presented. After selecting a mirror site, a list of available packages will appear. ) Select the appropriate package desired and R will download and install it. 1 Some authors and instructors will use the term library instead of package. 1: Example of the R console window on a Mac. The name of the package can also be typed—inside of quotation marks—directly into the i n s t a l l .

16 when assigning the logical values in the object l o g i c a l , vector. However, it is quicker to write a conditional statement and then use the assignment operator to store the logical values produced into a new vector. 16 in the assignment of the object o l d e r . t h a n . f ive. 6 GETTING HELP The R Development Core Team has written several helpful documents for the novice user, such as The R FAQ (Hornik, 2010), An Introduction to R (Venables, Smith, & the R Development Core Team, 2009), and R Data Import/Export (R Development Core Team, 2009).

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