# Scale

The forward transform and backward transform are each associated with a scale factor σ of its own with default value of 1. The user can set one or both of them via the two configuration parameters `DFTI_FORWARD_SCALE` and `DFTI_BACKWARD_SCALE`. For example, for a one-dimensional transform of length n, one can use the default scale of 1 for the forward transform while setting the scale factor for backward transform to be 1/n, making the backward transform the inverse of the forward transform.

The scale factor configuration parameter should be set by a real floating-point data type of the same precision as the value for `DFTI_PRECISION`.

Parent topic: Configuration Settings