| mgariepy | good morning everyone | 13:03 |
|---|---|---|
| highvoltage | good morning | 14:26 |
| stgraber | morning | 14:27 |
| martsbradley | Hi folks, | 20:51 |
| martsbradley | I've a bit of software I wrote for the mathematical order of operations, for example to illustrate that 1+2*3=7 rather than 9. | 20:52 |
| martsbradley | A video of its available at http://www.youtube.com/watch?v=xc9cu-ekFrg | 20:53 |
| martsbradley | Is it worth packaging it and putting it into ubuntu? I've got all the source code, its written in wx widgets and is all my own code. | 20:53 |
| martsbradley | ? | 20:53 |
| highvoltage | hi martsbradley | 20:54 |
| martsbradley | Hi Highvoltage | 20:54 |
| highvoltage | it looks like it could be useful to someone, so why not :) | 20:54 |
| alkisg | martsbradley: just an idea, if you could make it show infix/postfix etc notations with that tree, I'm sure it would be useful to some CS students | 20:55 |
| highvoltage | martsbradley: what does it do with http://knowyourmeme.com/memes/48293/ ? :) | 20:55 |
| martsbradley | I'll boot up my other computer and try it out. | 20:57 |
| highvoltage | martsbradley: but yes, I think it would be nice, and if it's stable and not otherwise troublesome we'd probably include it in edubuntu too. | 20:58 |
| martsbradley | 288 it gives | 21:02 |
| martsbradley | It had a little problem with the 2(9, it did not recognise it as a multiply so had to insert the * between the 2 and the opening bracket | 21:02 |
| martsbradley | Is 288 the expected answer, I'm sure it is but I'm no math teacher. | 21:04 |
| highvoltage | ah see the way I was taught in school "48 / 2(9+3)" and "48 / 2 * (9+3)" would give different answers. but I guess that's one of the sucky things about differences in math across different regions that that post highlights | 21:04 |
| martsbradley | I was taught that the 2(9+3) means add 9 & 3 then multiply by 2, even though the multiply operator was omitted. | 21:04 |
| highvoltage | martsbradley: yep, same here. | 21:05 |
| highvoltage | and if you do that then you get to the answer "2" | 21:05 |
| martsbradley | I was taught by the BODMAS expression, brackets order division multiply add subtract it stands for, therefore the brackets come first, so 9+3 =12 | 21:06 |
| martsbradley | Then 48 /2 | 21:07 |
| martsbradley | 24 * 12 must be 288 | 21:07 |
| highvoltage | oopes, I meant 24 instead of 2 | 21:07 |
| highvoltage | (man that chapaign we had at work went straight to my head) | 21:07 |
| martsbradley | Lucky u. | 21:07 |
| martsbradley | So we agree 288 is correct answer. | 21:08 |
| highvoltage | well... | 21:08 |
| highvoltage | ... | 21:08 |
| highvoltage | that's debatable depending on how you were taught | 21:08 |
| highvoltage | but I think it's the right answer for your software to give | 21:08 |
| martsbradley | I think that Ireland and America is taught in same way, not sure about Europe + rest of world. | 21:09 |
| highvoltage | oh no, I was right first time, I would end up with 2 as the answer | 21:09 |
| highvoltage | (Implied multiplication) | 21:09 |
| highvoltage | 48 ÷ 2(9+3)= | 21:09 |
| highvoltage | 48 ÷ 2(12)= | 21:09 |
| highvoltage | 48 ÷ 24= | 21:09 |
| highvoltage | 2 | 21:09 |
| martsbradley | I'll look at that page to see what they came up with | 21:10 |
| highvoltage | yeah I'm no mathemetician either. but I just think it would be nice if your software could be aware of these kind of things. just as a wish list :) | 21:10 |
| martsbradley | Yea they have two different answers also, not good. I thought mathematics was the 'universal language' | 21:11 |
| highvoltage | heh, yeah it has some similar problems as natural languages though. in some areas other conventions were formed so some expressions mean different things | 21:12 |
| highvoltage | that's why different calculators also give different answers for the same equation | 21:13 |
| martsbradley | ok thanks for the help, bye. | 21:14 |
| highvoltage | bye! | 21:14 |
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