SetXScaleType
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## SetXScaleType

SetXScaleType — Select linear or logarithmic scale

## Synopsis

    $plot->SetXScaleType($st)

## Description

`SetXScaleType` sets the scale type along the X axis to be either linear (the default) or logarithmic.

## Parameters

`$st`

  A string specifying the scale type: 'linear' or 'log'.

## Notes

No X value may be less than or equal to 0 with logarithmic X scale.

Support for logarithmic scales in PHPlot is limited. One problem is that tick interval is fixed for the entire range of data, which is inappropriate for logarithmic scales where the data spans more than one magnitude.

The default X and Y scale types are linear.

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