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Author Topic: Optimizing lists and matrices for save files.  (Read 7225 times)

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Offline Broseph Radson

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Optimizing lists and matrices for save files.
« on: December 07, 2011, 10:42:38 am »
Im not sure if this has been posted before, so here goes.
Using iPart() and fPart(), you can save lists or matrices with 2 entries per cell. {1.1} rather than  {1,1}. Every 2 entries saves 9 bytes with this method.
Loading is as simple as iPart(L1(A)) for the first entry in a cell, and 10fPart(L1(A)) for the second (the 10 is there because fPart returns the decimal as a decimal.)
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Offline Hayleia

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Re: Optimizing lists and matrices for save files.
« Reply #1 on: December 07, 2011, 10:47:47 am »
Yes, it is a very effective way to save space.
However, it depends ;)
-If you prefer saving space in the executable rather than in the list
-If you store something else than a number between 0 and 10.

For everything else, it works very well :thumbsup:
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Offline Deep Toaster

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Re: Optimizing lists and matrices for save files.
« Reply #2 on: December 07, 2011, 06:27:04 pm »
More generally, you can save up to 7 values between 0 and 99 in one element (one real number) in the form 0.AABBCCDDEEFFGG, where each pair of letters is a value to save. To get the xth value in variable Y, use iPart(E2fPart(YE[2x].
« Last Edit: December 07, 2011, 06:27:56 pm by Deep Thought »
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Offline ztrumpet

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Re: Optimizing lists and matrices for save files.
« Reply #3 on: December 07, 2011, 06:36:59 pm »
Quote from: Deep Thought on December 07, 2011, 06:27:04 pm
More generally, you can save up to 7 values between 0 and 99 in one element (one real number) in the form 0.AABBCCDDEEFFGG, where each pair of letters is a value to save. To get the xth value in variable Y, use iPart(E2fPart(YE[2x].
Actually it's closer to 6 values, as TI squanders a digit's worth of precision if the number is 14 digits long in the fpart/ipart section.
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Offline Broseph Radson

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Re: Optimizing lists and matrices for save files.
« Reply #4 on: December 07, 2011, 07:36:10 pm »
Now that is cool :o
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Offline Builderboy

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Re: Optimizing lists and matrices for save files.
« Reply #5 on: December 07, 2011, 07:38:24 pm »
Quote from: ztrumpet on December 07, 2011, 06:36:59 pm
Quote from: Deep Thought on December 07, 2011, 06:27:04 pm
More generally, you can save up to 7 values between 0 and 99 in one element (one real number) in the form 0.AABBCCDDEEFFGG, where each pair of letters is a value to save. To get the xth value in variable Y, use iPart(E2fPart(YE[2x].
Actually it's closer to 6 values, as TI squanders a digit's worth of precision if the number is 14 digits long in the fpart/ipart section.

It does?  I believe it carries all 14 digits at all times without rounding, it just doesn't display them all when you use Disp or access on the homescreen
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Offline Deep Toaster

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Re: Optimizing lists and matrices for save files.
« Reply #6 on: December 07, 2011, 07:43:54 pm »
Quote from: ztrumpet on December 07, 2011, 06:36:59 pm
Quote from: Deep Thought on December 07, 2011, 06:27:04 pm
More generally, you can save up to 7 values between 0 and 99 in one element (one real number) in the form 0.AABBCCDDEEFFGG, where each pair of letters is a value to save. To get the xth value in variable Y, use iPart(E2fPart(YE[2x].
Actually it's closer to 6 values, as TI squanders a digit's worth of precision if the number is 14 digits long in the fpart/ipart section.
Oh right, it does. I've personally had trouble with it, but it doesn't always happen for some reason, and doesn't make sense to me anyway ??? Keep it at six to be safe.
« Last Edit: December 07, 2011, 07:44:06 pm by Deep Thought »
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Offline ztrumpet

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Re: Optimizing lists and matrices for save files.
« Reply #7 on: December 07, 2011, 08:59:09 pm »
Quote from: Builderboy on December 07, 2011, 07:38:24 pm
Quote from: ztrumpet on December 07, 2011, 06:36:59 pm
Quote from: Deep Thought on December 07, 2011, 06:27:04 pm
More generally, you can save up to 7 values between 0 and 99 in one element (one real number) in the form 0.AABBCCDDEEFFGG, where each pair of letters is a value to save. To get the xth value in variable Y, use iPart(E2fPart(YE[2x].
Actually it's closer to 6 values, as TI squanders a digit's worth of precision if the number is 14 digits long in the fpart/ipart section.

It does?  I believe it carries all 14 digits at all times without rounding, it just doesn't display them all when you use Disp or access on the homescreen
Huh, what do I know?  I was trying to make a screenie proving you wrong and instead proved myself wrong.  I guess it's all in how the code is coded on a given day.  Personally, this was the first time I tried coding it with the 10^(-2I part.
« Last Edit: December 07, 2011, 09:19:56 pm by ztrumpet »
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Offline Broseph Radson

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Re: Optimizing lists and matrices for save files.
« Reply #8 on: December 12, 2011, 09:29:10 am »
Quote from: Deep Thought on December 07, 2011, 06:27:04 pm
More generally, you can save up to 7 values between 0 and 99 in one element (one real number) in the form 0.AABBCCDDEEFFGG, where each pair of letters is a value to save. To get the xth value in variable Y, use iPart(E2fPart(YE[2x].

So i finally got around to testing this, and i cannot for the life of me figure out how im supposed to type this into my calc. If i write it like this, it gives me a syntax error. If i write it like in that screen, it always returns 0. ???
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