Search for a variable in a list of *.mat files Inputs: variable - The variable name to search for. Can be an exact name or just the beginning of a name. In the latter case put a * at the end. file filter - Filter for the file names to search (Optional). A .mat is added to the filter if it does not already exist Output: If no output has been assigned, the function will print all the files that contain the variable. Otherwise, a structure containing the file name and the variable name is output. Rezaul, 2004.