stokes (version 1.2-1)

coeffs: Extract and manipulate coefficients

Description

Extract and manipulate coefficients of ktensor and kform objects; this using the methods of the spray package.

Functions as.spray() and nterms() are imported from spray.

Author

Robin K. S. Hankin

Details

To see the coefficients of a kform or ktensor object, use coeffs(), which returns a disord object (this is actually spray::coeffs()). Replacement methods also use the methods of the spray package. Note that disordR discipline is enforced.

Experimental functionality for “pure” extraction and replacement is provided, following spray version 1.0-25 or above. Thus idiom such as a[abs(coeffs(a)) > 0.1] or indeed a[coeffs(a) < 1] <- 0 should work as expected.

Examples

(a <- kform_general(5,2,1:10))
coeffs(a) # a disord object
coeffs(a)[coeffs(a)%%2==1] <- 100  # replace every odd coeff with 100
a

coeffs(a*0)

a <- rform()
a[coeffs(a) < 5]         # experimental
a[coeffs(a) > 3] <- 99   # experimental