RPN Calculator 2.45

the author of this app says:

RPN Calculator is a programmable Reverse Polish Notation (RPN) calculator for science and engineering.

RPN Calculator supports more than 180 functions and 11 data types (real, integer, variable, vector, matrix, list, program, unit, complex, character strings and tags).

The stack, variables and programs can be saved and reloaded. The number of usable stack levels is virtually unlimited. If the number of levels in the stack exceeds the display, you can scroll up or down to see more.

Requirements

1.0 and higher