Casio FX991EX

[ijabbott]

(07-14-2018 03:32 AM)Albert Chan Wrote:  Hi, Ian Abbott

Sorry if I go off-topic a bit ...

You mean TI can do BOTH ?

Grabbing formula from history, like the Casio
Grabbing result from history, like RPN ENTER

Yes, as you scroll through the history with the up and down buttons, the selection cursor alternates between selecting a result or an input in a very intuitive fashion. Pressing enter copies and pastes the selected item to the cursor position on the input line for use in further calculations.

Quote:And, not just "shown" result, but it's full precision values ?

Just the shown result. It's basically just a textual copy and paste operation.

Quote:What about in equation mode, showing x1, x2 roots.
Can it grab those too ?

Not directly, but they can be saved to variables. The "poly-solv" mode (for solving quadratic or cubic equations with real coefficients) lets you copy each root to a choice of four variables (x, y, z, or t). It also uses the a, b, c, and d variables as the input coefficients and the r.h.s. of the equation. The "num-solv" mode stores the solution in x. It also remembers the previous equation. The "sys-solv" mode (linear equations of 2 or 3 variables) stores the solutions in the x, y, and z variables. It also remembers the previous set of equations unless you select a different number of variables. The variables can be used in the normal calculator mode.

There are eight normal variables in total: x, y, z, t, a, b, c, and d, plus the "ans" variable. (There are also three vector variables plus vector answer, and three matrix variables plus matrix answer. Vectors can be up to three dimensions. Matrices can be rectangular up to three rows and three columns.) These are retained on power off, as is the calculation history.