The input data file should be in the same format as in the supplied synthetic scattering data (file: BIMODAL.SAS). Formally the data should exist in the file as ordered triples of scattering vector (in 1/A), intensity and estimated error of intensity. Typically, the data will be in three columns, separated by “white space” of spaces and/or tabs. The intensity may be in any units as the program will ask for a conversion factor between these units and 1/cm units. The numbers are read as floating point numbers, hence 0.0015, 1.5E-3, 0.15E-2, and 15E-4 will be identical. However, do not be tempted to force double precision input (such as 1.5D-3) because this may provoke a nasty error condition.
The name of the data set should any standard filename for the operating system on which the program is run. A typical name would be BIMODAL.SAS (the synthetic scattering described earlier) which describes bimodal SAS data. If the data file resides in a directory other than the default, then you will have to specify that as part of the file name. Example file names, including a “full path description” follow for the more popular operating systems:
Digital Equipment Corporation VAX running VMS:
DISK$MPD_USERS:[CULVERWEL.MAXE]BIMODAL.SAS
Apple Macintosh:
Hard Drive:MaxSas Folder:test case:BIMODAL.SAS
MS-DOS computer (such as the IBM-PC):
C:\MAXSAS\TEST\BIMODAL.SAS