[TI73, TI83, TI86] Strange implied RETURN behavior

01072020, 04:52 PM
Post: #1




[TI73, TI83, TI86] Strange implied RETURN behavior
All TI calculators allow to omit RETURN at the end of a program executed as a subroutine, this RETURN is implied automatically at the eng of that program. I type this code:
Code: PROGRAM:INTEGRAL If I omit RETURN at the end, the calculation takes MORE time than with explicit RETURN. The difference is (at m=2^11) 13..15 seconds on a TI86, 4 seconds on a TI83, approx. 1 second on a TI73 Explorer. The difference is very small, but it can be reliably measured and reproduced. Why does it happen? PS, do other calculators (e. g. HP) have the possibility to omit RETURN? And does it affect the calculation time? 

01072020, 08:21 PM
Post: #2




RE: [TI73, TI83, TI86] Strange implied RETURN behavior
TI calculators are negligent about syntax. This slightly saves memory, sometimes allows you to do undocumented tricks. In cyclic computing, these tricks may slow down the program, as mentioned long ago on the TIforum. Here are some examples for TI83.
{1,2,3>AB instead of {1,2,3}>LAB DelVar_AB>C instead of DelVar_A:B>C If_B:5>C ... If_B<>0:Then:5>C For(A,1,B,C:End ... For(A,1,B,C):End and so on. 

01072020, 08:56 PM
Post: #3




RE: [TI73, TI83, TI86] Strange implied RETURN behavior  
01082020, 03:31 PM
Post: #4




RE: [TI73, TI83, TI86] Strange implied RETURN behavior
(01072020 08:56 PM)Csaba Tizedes Wrote: OFF Simpson method on TIs: one of the most creative way /OFF Thanks for the link! There's some good information in that paper. The programs aren't too hard to convert to other machines. Tom L My wife's judgement is much better than mine. Look who we each married! 

01082020, 04:20 PM
Post: #5




RE: [TI73, TI83, TI86] Strange implied RETURN behavior
(01082020 03:31 PM)toml_12953 Wrote: Thanks for the link! There's some good information in that paper. The programs aren't too hard to convert to other machines. If you interested, check this one: Stewart calculus TI89/92 version and TI83 version. Both of them really valuable. Csaba 

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