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Complex and real modes

Erable has two major modes: complex and real mode. The user flag 13 is set in complex mode and cleared in real mode (default state). This mode affects the way Erable outputs results. For example, partial fraction decomposition is made over $I\!\!\!\!C $ or over $I\!\!R $ depending of the current mode. If you see unwanted i on the stack, this means that Erable is probably in complex mode. For G/GX users, the key sequence $\alpha $-right shift-CST provides an easy way to switch to complex or real mode using arrow keys to select the mode (type the ENTER key to confirm). HP48S/SX users can go to real mode either by typing 13 CF or by typing VER (which reset all flags to their default state) and can switch to complex mode by typing 13 SF.



Bernard Parisse
1998-07-31