In Fortran, you can start the index from any number you want. A(-10:-3) is a completely valid slice or full array declaration, so are A(0:7) or A(1:8). and this

In Fortran, you can start the index from any number you want. A(-10:-3) is a completely valid slice or full array declaration, so are A(0:7) or A(1:8). and this feature is absolutely useful in scientific computing.