Hi Osama, not 100% clear on what you are trying to do, but you definitely have a problem with the save line. If you are trying to create a filename string you will want to enclose the concatenated strings in brackets, such as:
save(['D:\Input_data\H_L\',num2str(i),'\Leiter'],'Name_Variable_Workspace')
Otherwise the save function will try to interpret the command as multiple input arguments. I don't think you want this. Also I would take mkdir(['H_L']); outside the for loop as it only needs to be created once.
ADragon
