The dimension of the transform is a positive integer value represented in an integer scalar of Integer data type in Fortran and MKL_LONG data type in C. For a one-dimensional transform, the transform length is specified by a positive integer value represented in an integer scalar of Integer data type in Fortran and MKL_LONG data type in C. For multi-dimensional (≥ 2) transform, the lengths of each of the dimensions are supplied in an integer array (Integer data type in Fortran and MKL_LONG data type in C).
DFTI_DIMENSION and DFTI_LENGTHS are two of the four configuration parameters that do not have a default value. To set them, use the DftiCreateDescriptor function and not the DftiSetValue function.
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