HP 35s HP 35s scientific calculator - User Guide - Page 158

Creating Vectors from Variables or Registers It is possible to create vectors containing the contents of memory variables, stack registers, or values from the indirect registers, in run or program modes. In ALG mode, begin entering the vector by pressing 3. RPN mode works similarly to ALG mode, except that the d key must be pressed first, followed by pressing 3 . To enter an element containing the value stored in a lettered variable, press h and the variable letter. To enter an element from a stack register, press the < key and use the Õ or Ö keys to move the underline symbol so that it is under the stack register to be used and press  To enter an element indirectly indicated by the value in the I or J register, press h and either (I) or (J). For example, to construct the vector [ C, REGZ, (J) ] in RPN mode, press d 3, then hC h A. 10-8 Vector Arithmetic