vtype

vtype(var)

:: Type of indetarminates var.

return

integer

var

indeterminate

• Classify indeterminates into sub-types by giving an integer value as follows. For details See section Types of indeterminates.

  0

  ordinary indeterminate, which can be directly typed in on a keyboard (a,b,x,afo,bfo,...,etc.)

  1

  Special indeterminate, created by uc() (_0, _1, _2, ... etc.)

  2

  function form (sin(x), log(a+1), acosh(1), @pi, @e, ... etc.)

  3

  functor (built-in functor name, user defined functor, functor for the elementary functions) : sin, log, ... etc)

• Note: An input `a();' will cause an error, but it changes the system database for identifiers. After this error, you will find `vtype(a)' will result 3. (Identifier a is registered as a user defined functor).
• Usually @pi and @e are treated as indeterminates, whereas they are treated as numbers within functions eval() and pari().

References

section type, section ntype, section uc.

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