Return the ppm scale of an MRS dataset or fit result.
ppm(x, ft = NULL, ref = NULL, fs = NULL, N = NULL)
# S3 method for mrs_data
ppm(x, ft = NULL, ref = NULL, fs = NULL, N = NULL)
# S3 method for fit_result
ppm(x, ft = NULL, ref = NULL, fs = NULL, N = NULL)| x | MRS dataset of fit result. |
|---|---|
| ft | transmitter frequency in Hz, does not apply when the object is a fit result. |
| ref | reference value for ppm scale, does not apply when the object is a fit result. |
| fs | sampling frequency in Hz, does not apply when the object is a fit result. |
| N | number of data points in the spectral dimension, does not apply when the object is a fit result. |
ppm scale.