• Sometimes indicated as an "operand range error" in an error message.

• Example code:
          parameter (nx=11)
          dimension x(nx)
          xrange=1.
          dx=xrange/float(nx-1)
          x(1) = 0.
          do 1 i=1,nx
          x(i+1)=x(1)+float(i-1)*dx
      1 continue

• Comments:
  When i=nx this code writes to x(nx+1) which is outside the array bounds of x. Hence, it could overwrite some other variable, sometimes part of the source code!

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