next | previous | forward | backward | up | top | index | toc | Macaulay2 web site
PHCpack :: computingPrecision

computingPrecision -- flag to switch to double double or quad double precision

Description

By default, all computations occur in hardward double precision. While this precision could be large enough to obtain accurate results, for larger problems, one may need to increase the precision to double double or to quad double precision.

Setting the value of computingPrecision to 2 changes the precision in the path trackers to double double.

Setting the value of computingPrecision to 4 changes the precision in the path trackers to quad double.

To compensate for the cost overhead of the higher precision, it is useful to run the multithreaded versions of the path trackers, see the option numThreads.

Functions with optional argument named computingPrecision :

For the programmer

The object computingPrecision is a symbol.