IREADFIS Load FIS from disk. FISMAT=READFIS('filename') creates a FIS matrix in the workspace corresponding to the FIS file 'filename' on disk. FISMAT=READFIS brings up a UIGETFILE dialog box to assist with the name and directory location of the file. The extension '.fis' is assumed for 'filename' if it is not already present. See also WRITEFIS.