TI 36X Pro data pair limit...

[ijabbott]

(01-16-2019 11:56 PM)Albert Chan Wrote:  

(01-16-2019 09:25 AM)ijabbott Wrote:  For comparison, Casio fx-991EX supports a 1-variable list length of 160, or a 2-variable list length of 80, but the data is volatile.

Really?

On closer examination, the statistics data is retained when the calculator is turned off, but is cleared when switching modes (even when switching between 1-variable and 2-variable modes within the Statistics mode). Not all the modes retain data when powering off. For example, the Spreadsheet mode clears the data when powering off (even for automatic power off) or when switching modes. (I suppose Spreadsheet mode has its uses, but its volatility limits its usefulness somewhat!)

Quote:Both my Casio FX-115MS and FX-3650P retains the data unless MODE switched.

Similar to the fx-991EX then, except that one has a lot more modes to switch between.

Quote:BTW, FX-3650P memory pool is shared, like the HP-12C.
Unless you sacrifice programming area, you have very little space for statistics.

Both the fx-991EX and TI-3x multi type calculators are non-programmable, so there is no programming space to sacrifice.

The non-programmable fx scientifics may share the same data space between the different modes since it clears the data when switching modes.

As far as I can tell, the TI-3x multi type calculators do not share storage between the different modes, and the data for each mode is retained when switching back to that mode.

Quote:With my setup (program steps almost all used up), I can only do 17 data points

Correction:
Casio FX-3650P had an EditOFF feature that allow adding unlimited points.
The downside is inability to edit old entries.
Correction is still possible, using M- to delete data.

The early Casio scientifics only support summation based statistics (and only supported 1-variable statistics), storing the sum, the sum of squares, and the number of data, but not the individual data. This is like the EditOFF feature you mentioned. It saves storage space as only a few registers are needed to accumulate the data. It's enough to do standard deviation calculations, but there is no way to do any quantile calculations on the data.