10.2. Basic

Compose (f,g)

Compose two functions and return a function that is the composition of f and g.

ComposePower (f,n,x)

Compose a function with itself n times, passing x as argument, and returning x if n == 0. Examples:

genius> function f(x) = x^2 ;
genius> ComposePower (f,3,7)
= 5764801
genius> f(f(f(7)))
= 5764801

GetCurrentModulo

Get current modulo from the context outside the function

Identity (x)

Identity function, returns its argument

IntegerFromBoolean (bval)

Make integer (0 for false or 1 for true) from a boolean value. bval can also be a number in which case a non-zero value will be interpreted as true and zero will be interpretted as false.

IsBoolean (arg)

Check if argument is a boolean (and not a number)

IsFunction (arg)

Check if argument is a function

IsFunctionOrIdentifier (arg)

Check if argument is a function or identifier

IsFunctionRef (arg)

Check if argument is a function reference

IsMatrix (arg)

Check if argument is a matrix

IsNull (arg)

Check if argument is a null

IsString (arg)

Check if argument is a text string

IsValue (arg)

Check if argument is a number

SetFunctionFlags (id,flags...)

Set flags for a function, currently "PropagateMod" and "NoModuloArguments"

SetHelp (id,category,desc)

Set the category and help description line for a function

SetHelpAlias (id,alias)

Sets up a help alias

chdir (dir)

Changes current directory

display (str,expr)

Display a string and an expression

error (str)

Prints a string to the error stream

exit

Aliases: quit

Exits the program

false

Aliases: False FALSE

The false boolean value

manual

Displays the user manual

print (str)

Prints an expression

printn (str)

Prints an expression without a trailing newline

protect (id)

Protect a variable from being modified

set (id,val)

Set a global variable. The id can be either a string or a quoted identifier as follows. For example:

set(`x,1)
	    

string (s)

Make a string. This will make a string out of any argument.

true

Aliases: True TRUE

The true boolean value

unprotect (id)

Unprotect a variable from being modified

wait (secs)

Waits a specified number of seconds.

warranty

Gives the warranty information