showMonomialXYZ function

Print a monomial

Prints a monomial like "x.z^2" if possible (see details).

showMonomialXYZ(letters = c("x", "y", "z"), collapse = ".")

Arguments

• letters: a vector of strings, usually some letters such as "x"

  and "y", to denote the variables

• collapse: a string to denote the symbol representing the multiplication, e.g. "*" or "."

Returns

A function which takes as argument a sequence of exponents and which prints the corresponding monomial.

Details

If the function returned by this function is applied to a vector of exponents whose length is higher than the length of the letters

vector, then showMonomialX1X2X3(x=letters[1]) is applied (see the last example).

Note

The function returned by this function can be used as the option "showMonomial" in the showQsprayOption<- function.

Examples

showMonomialXYZ()(c(1, 0, 2))
showMonomialXYZ(collapse = "*")(c(1, 0, 2))
showMonomialXYZ()(NULL)
# what happens if there are more exponents than letters:
showMonomialXYZ(c("a", "b"), collapse = "*")(c(1, 2, 3))
# same as:
showMonomialX1X2X3("a", collapse = "*")(c(1, 2, 3))
# setting a show option:
set.seed(3141)
( qspray <- rQspray() )
showQsprayOption(qspray, "showMonomial") <- showMonomialXYZ(c("A", "B", "C"))
qspray
# this is equivalent to:
showQsprayOption(qspray, "showQspray") <- showQsprayXYZ(c("A", "B", "C"))

See Also

showQsprayXYZ, showMonomialX1X2X3, showQsprayOption<-.