English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The method for computing certain inverse functions, one binary digit at a time, which was described by D. R. Morrison in a recent issue of MTAC [1] has been used in this laboratory. In particular, a subroutine for computing an inverse cosine, x = arc cosy, based on the method was given in [2] (part III, subroutine T4, p. 152-153). It was, however, pointed out by van Wijngaarden [3] that the method gives poor accuracy for certain values of the argument, namely, those for which one or more of the functions cos x, cos 2x, cos Ax • • • cos 2kx are near unity. When x is near zero the error is, perhaps, of little importance since the equation x — arc cos y does not then determine x with any great precision, but this is not the case when x is near x/2, ir/4, etc. In general abnormally large errors may occur if, in Morrison's notation,

Note on “A Method for Computing Certain Inverse Functions” [MR0083821]