# AsciiMath Input Processor Options

The options below control the operation of the AsciiMath input processor that is run when you include `'input/asciimath'` in the in the `load` array of the `loader` block of your MathJax configuration, or if you load a combined component that includes the AsciiMath input jax (none currently do, since the AsciiMath input has not been fully ported to version 3). They are listed with their default values. To set any of these options, include an `asciimath` section in your `MathJax` global object.

## The Configuration Block

    MathJax = {
      asciimath: {
        fixphi: true,              // true for TeX mapping, false for unicode mapping
        displaystyle: true,        // true for displaystyle typesetting, false for in-line
        decimalsign: '.'           // character to use for decimal separator
      }
    };

## Option Descriptions

fixphi: true

  Determines whether MathJax will switch the Unicode values for `phi` and `varphi`. If set to `true` MathJax will use the TeX mapping, otherwise the Unicode mapping.

displaystyle: true

  Determines whether operators like summation symbols will have their limits above and below the operators (true) or to their right (false). The former is how they would appear in displayed equations that are shown on their own lines, while the latter is better suited to in-line equations so that they don’t interfere with the line spacing so much.

decimalsign: "."

  This is the character to be used for decimal points in numbers. If you change this to `','`, then you need to be careful about entering points or intervals. E.g., use `(1, 2)` rather than `(1,2)` in that case.

The remaining options are described in the Options Common to All Input Processors section.

## Developer Options

In addition to the options listed above, low-level options intended for developers include the following:

FindAsciiMath: null

  The `FindAsciiMath` object instance that will override the default one. This allows you to create a subclass of `FindAsciiMath` and pass that to the AsciiMath input jax. A `null` value means use the default `FindAsciiMath` class and make a new instance of that.