Math Library

< include math.hei >

into the beginning of your page to use the following functions.

The Source Code file math.hei, located in the lib directory, is part of the package you receive when you download heitml.

We only have a few math function as of today (), but you are free to define the math functions you need. If you are using heitml on UNIX, you can even add built-in math functions through the userfun.c module.

Also, don't forget that there are already quite a number of heitml Built-in Numerical functions to serve your needs, so be sure to review that section of the Language Reference.

Example:

heitml input:	resulting output:
<? abs(42)>	42
<? abs(-42)>	42
<? abs(12-42)>	30

Example:

heitml input:	resulting output:
<? sqr(5)>	25
<? sqr(sqr(5))>	625

Example:

heitml input:	resulting output:
<? cube(3)>	27
<? cube(sqr(2))>	64

Example:

heitml input:	resulting output:
<? power(2,16)>	65536
<? power(cube(sqr(2)),4)>	16777216

Example:

heitml input:	resulting output:
<? log10(-1) "Nn">	null
<? log10(0) "Nn">	null
<? log10(.001)>	-3
<? log10(.1)>	-1
<? log10(1)>	0
<? log10(10)>	1
<? log10(50)>	1
<? log10(100)>	2