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SonicBoom95
Member
Joined: 31 Jan 2008
Posts: 237
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 Posted: 26 Feb 2009 08:37:58 am Post subject: |
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We've all had those moments. The moments where you search tirelessly for a bug, only to discover that it's been sitting under your nose the whole time. The moments where you miss an obvious and critical optimization. The moments where you look back and say, "What was I thinking?"
This is a place to share those stories. Hopefully, we can all learn from them.
Delvars
I was tearing my hair out. My Repeat loop wasn't triggering consistently. I had code scattered around displaying every single variable. I had checked the conditionals. I had checked my nesting. And it still wasn't working.
Code:
:Delvar HDelvar YRepeat Y=14
:...
:End
I noticed the Delvar problems about five minutes after the third RAM clear.
MORAL:
{Repeat, While, For}->L1
Delvar + L1 = BAD
More to come.
EDIT: format
Last edited by Guest on 26 Feb 2009 08:39:32 am; edited 1 time in total |
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darkstone knight
Advanced Member
Joined: 07 Sep 2008
Posts: 438
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| Posted: 26 Feb 2009 10:16:49 am Post subject: |
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well... i once had a bug in this code:
LD (HL),E\ inc hl
LD (HL),D\ inc hl
...
after about 30 minutes, i figured it out, it was supposed to be this:
LD E,(HL)\ inc hl
LD D,(HL)\ inc hl
morale of the story:
dont use ctr+V... |
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Galandros
Active Member
Joined: 29 Aug 2008
Posts: 565
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| Posted: 26 Feb 2009 04:20:33 pm Post subject: |
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hahahaha
I made a loop for testing purposes that is somewhat like the main loop but I forgot to clear gbuf before writing to it.
The result was strange screen that I didn't know what caused.
But I stand half an hour and I had the solution right in bellow. o.O |
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SonicBoom95
Member
Joined: 31 Jan 2008
Posts: 237
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| Posted: 27 Feb 2009 08:31:26 am Post subject: |
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I had finished a three-week programming project. I raised my arms in joy...while still holding my calculator. My calculator hit the ceiling, hit the floor, and did everything but tap dance and sing "Ave Maria." One battery ruptured, three keys fell off, the screen went black, and (of course) after I had repaired all the damage, it RAM cleared.
I don't raise my arms anymore. |
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darkstone knight
Advanced Member
Joined: 07 Sep 2008
Posts: 438
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| Posted: 27 Feb 2009 09:04:25 am Post subject: |
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ROFL  |
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Galandros
Active Member
Joined: 29 Aug 2008
Posts: 565
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| Posted: 27 Feb 2009 02:14:28 pm Post subject: |
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Omnicalc RAM recovery is my watching angel (expression makes sense?).
And I group everything, after I make some good progress... |
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simplethinker
snjwffl
Active Member
Joined: 25 Jul 2006
Posts: 700
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| Posted: 27 Feb 2009 03:19:48 pm Post subject: |
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I was writing a (Python) program to model traffic flow in a roundabout. The collision detection was based on angular distance, so I needed a way to turn 350-10 into -20. This was for a math competition, so naturally our first thought was a trick along the lines of arccos(cos()) and it seemed to work fine. A day and a half later, with less than 16 hours until the competition was over, when we were almost done collecting the data (with full simulations taking 45 minutes) I noticed around the zero degree mark there was a huge pile-up of cars. And then we realized the image of arccosine is always positive :sick:
Last edited by Guest on 27 Feb 2009 06:49:59 pm; edited 1 time in total |
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darkstone knight
Advanced Member
Joined: 07 Sep 2008
Posts: 438
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| Posted: 27 Feb 2009 04:02:43 pm Post subject: |
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i made that cos( mistake once....
fpart( is your friend :biggrin: |
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simplethinker
snjwffl
Active Member
Joined: 25 Jul 2006
Posts: 700
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| Posted: 27 Feb 2009 06:52:24 pm Post subject: |
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darkstone knight wrote: i made that cos( mistake once....
fpart( is your friend :biggrin:
How would fPart help (and remember this was in Python, not on a calculator, so it would be x-floor(x)) |
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thornahawk
μολών λαβέ
Active Member
Joined: 27 Mar 2005
Posts: 569
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| Posted: 27 Feb 2009 09:13:02 pm Post subject: |
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Nothing too exotic for me, just misplaced or missing minus and/or plus signs. Which is infuriating if it's in the middle of a very complicated expression. ;)
Now, I try not to program anymore when sleep-deprived... ;)
thornahawk
Last edited by Guest on 27 Feb 2009 09:15:04 pm; edited 1 time in total |
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magicdanw
pcGuru()
Calc Guru
Joined: 14 Feb 2007
Posts: 1110
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| Posted: 28 Feb 2009 06:20:04 am Post subject: |
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thornahawk wrote: Nothing too exotic for me, just misplaced or missing minus and/or plus signs. Which is infuriating if it's in the middle of a very complicated expression. ;)
Now, I try not to program anymore when sleep-deprived... ;)
thornahawk
CalcUtil was programmed almost entirely via sleep-deprivation. I dunno if that's a good thing or not...  |
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Galandros
Active Member
Joined: 29 Aug 2008
Posts: 565
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| Posted: 28 Feb 2009 06:32:13 am Post subject: |
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When I am sleep-deprived I can even see asm code. Not sure about BASIC...
But making homework is definitely bad. (classes... oh...) |
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tr1p1ea
Elite
Joined: 03 Aug 2003
Posts: 870
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| Posted: 28 Feb 2009 06:39:13 am Post subject: |
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Yeah i get silly ones from time to time, and sometimes some real strange ones that require a lot of work to discover ... most often they do occur when im really tired.
I remember i had to rewrite a section of code like 5 times because everytime it wouldnt work and id come back the next day and be puzzled as to what i was thinking when i wrote it :X. |
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SonicBoom95
Member
Joined: 31 Jan 2008
Posts: 237
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| Posted: 01 Mar 2009 02:41:22 pm Post subject: |
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Galandros wrote: Omnicalc RAM recovery is my watching angel (expression makes sense?).
I believe the expression is "guardian angel." Close, though :biggrin:
For about three months, one of my friends had a program from me, written with the help of xLIB. I later discovered that he had run this program from MirageOS every single time he used it. The investigation was launched after his calc got so historically bricked, we had to do an OS resend twice. Moral: Documentation is your friend. |
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Weregoose
Authentic INTJ
Super Elite (Last Title)
Joined: 25 Nov 2004
Posts: 3976
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| Posted: 01 Mar 2009 03:10:46 pm Post subject: |
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I've occasionally placed cos‾¹( down on accident instead of a curly brace, realizing my mistake only during testing.
Last edited by Guest on 11 Jul 2010 06:11:17 pm; edited 1 time in total |
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Galandros
Active Member
Joined: 29 Aug 2008
Posts: 565
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| Posted: 01 Mar 2009 05:20:13 pm Post subject: |
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Weregoose wrote: I've occasionally placed cos‾¹( down on accident instead of a curly brace, realizing my mistake only during testing.
Ugh, I sometimes write a trigonometric function with ‾¹ instead of without, but I notice right after appearing in the screen...
Last edited by Guest on 11 Jul 2010 06:10:35 pm; edited 1 time in total |
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magicdanw
pcGuru()
Calc Guru
Joined: 14 Feb 2007
Posts: 1110
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| Posted: 01 Mar 2009 05:32:30 pm Post subject: |
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SonicBoom95 wrote: For about three months, one of my friends had a program from me, written with the help of xLIB. I later discovered that he had run this program from MirageOS every single time he used it. The investigation was launched after his calc got so historically bricked, we had to do an OS resend twice. Moral: Documentation is your friend. Well, a program needs a special ":" at the beginning in order to appear in MirageOS, so either your friend decided to mess with someone else's source code, in which case he incurs his own risks, or you put it there, thus encouraging him to run it in MirageOS. Either way, documentation would not have been much help |
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Galandros
Active Member
Joined: 29 Aug 2008
Posts: 565
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| Posted: 02 Mar 2009 07:20:47 am Post subject: |
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magicdanw wrote: SonicBoom95 wrote: For about three months, one of my friends had a program from me, written with the help of xLIB. I later discovered that he had run this program from MirageOS every single time he used it. The investigation was launched after his calc got so historically bricked, we had to do an OS resend twice. Moral: Documentation is your friend. Well, a program needs a special ":" at the beginning in order to appear in MirageOS, so either your friend decided to mess with someone else's source code, in which case he incurs his own risks, or you put it there, thus encouraging him to run it in MirageOS. Either way, documentation would not have been much help
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WikiGuru
ADOS (Attention deficit... Oh! Shiny!)
Elite
Joined: 15 Sep 2005
Posts: 923
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| Posted: 02 Mar 2009 05:43:48 pm Post subject: |
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| I was writing some regression code, and I forgot to actually save the updated values. Took hours to see which part of the code was going wrong. |
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Open Topic & United-TI Talk => General Open Topic
