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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,673

hi guys

tell me what you think of these:

1)two horizontal rays at heights 3 and 1:

y=2+sgn(x)

this can be generalized to two horizontal rays of heights a and b with the formula being:

2)two parallel non-horizontal rays at heights 1 and -1:

y=x+sgn(x)

this can be generalized to two parallel non-horizontal rays at heights a and b with the formula:

but can also be generalized to two **non**-parallel non-horizontal rays at heights a and b with the formula:

3)i have also find a way to plot two parallel lines(horizontal or vertical),but unfortunately wolfram won't plot this function.

for two vertical lines there are 3 different formulas depending where we want the lines to be.i will give the formula for when the two lines are on the right of the y-axis:

*Last edited by anonimnystefy (2012-02-19 02:11:45)*

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,673

any feedback?

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,758

I can not see anything, can you fix the tags?

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**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,673

all fixed up

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Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,758

Hi;

Sometimes it is convenient to use piecewise functions.

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,673

yes,but i looked for ways to do it with only one function.

is there to merge a three-part piecewise function into one?

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,758

Hi anonimnystefy;

What is the piecewise function?

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,673

e.g.:

f(x)={(-1 when x<1,0 when x∈(-1,1),1 when x>1)

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,758

I can not see any of those images so I am having trouble understanding what you already did.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,673

i put in some links instead of pictures.it should be fine now

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
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I am still only getting Alpha' s site and that whirring thing.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,673

what whirring thing?

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,758

The symbol for computation is running.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,673

it's working fine for me.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
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Hi anonimnystefy;

Sorry, I am not getting anything.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,673

hi bobbym

i don't know what to do,but you could try entering that into W|A yourself.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
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Yes, I have done that. I can now see it all.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,673

and?

btw,i successfully installed wxMaxima.

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**bobbym****Administrator**- From: Bumpkinland
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That is good but you should have asked me first.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,673

why?

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
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I would have suggested Geogebra, it comes with Maxima and with latexing capabilities.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,673

hi bobbym

i think i have Geogebra on my desktop computer,and it's very good.i like that i'm able to give out commands instead of drawing everything "by hand" although i think that the latter is better.

but anyway Maxima by itself is not bad at all except for some few minor incapabilities.what i would like to do is find a way to solve recursions and then use the function that i get a a solution as a function on its own.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
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I do not know what Maxima's capabilities for solving recurrences is offhand. They are solved by two methods, generating functions and the auxiliary polynomial.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,673

i know them both.for some of them i like GFs more,but for some too hard i like using the AP.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
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Generally, like DE's only some of them can be solved for.

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