only positive y

hi,

unfortunatly i dont know the english word of what im searching for.
i want the program to draw functions with only positive y.
generally it is written like this: f(x)= |x^3| for example.
i read the help and the faq but did not find anything. hope you can help.

thx

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Re: only positive y

I think you mean "the signed value". Try to draw the function

f(x)=sign(x^3)

Best regards,
Michael

>
>hi,
>
>unfortunatly i dont know the english word of what im searching for.
>i want the program to draw functions with only positive y.
>generally it is written like this: f(x)= |x^3| for example.
>i read the help and the faq but did not find anything. hope you can help.
>
>thx
>
>
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Re: only positive y

Please try f(x)=abs(x^3)

Regards,

Peter L. M. Kwan

----- Original Message ----- 
From: "Domi" <domi.rauch <at> googlemail.com>
To: <graph-support <at> lists.sourceforge.net>
Sent: Tuesday, April 03, 2007 8:33 PM
Subject: [Graph-support] only positive y

> hi,
>
> unfortunatly i dont know the english word of what im searching for.
> i want the program to draw functions with only positive y.
> generally it is written like this: f(x)= |x^3| for example.
> i read the help and the faq but did not find anything. hope you can help.
>
> thx
>
>
> -------------------------------------------------------------------------
> Take Surveys. Earn Cash. Influence the Future of IT
> Join SourceForge.net's Techsay panel and you'll get the chance to share 
> your
> opinions on IT & business topics through brief surveys-and earn cash
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> _______________________________________________
> Graph-support mailing list

Re: only positive y

yeah. thats exatly what ive been looking for. thank you very much!

Peter L. M. Kwan <peterkwan00 <at> netvigator.com> writes:

> 
> Please try f(x)=abs(x^3)
> 
> Regards,
> 
> Peter L. M. Kwan
> 

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Re: only positive y

no, though its another interessting function i know some things to use it for. 
what i search is the absolute value. for example:
f(x) = |x|
f(-2) = 2
g(x) = |x^3|
g(-2) = 8 (instead of -8 when it was just x^3

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Shading a system of linear inequalities

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Re: Shading a system of linear inequalities

lady mustang wrote:
> I was wondering if you could tell me how to shade a system of linear 
> inequalities. the systems is 3x-y is less than or equal to 6, x is 
> greater than or equal to 1 and y is less than or equal to 3. Thank you. 
> I have them plotted just can't figure out the shading on it.

The easiest way is to use a relation (Function|Insert relation). Enter 
the relation as: 3x-y<=6 and enter the constraints as: x>=1 and y<=3

Best regards
Ivan Johansen

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how to measure a distance between two points

Hi,

does anybody have an idea how to measure the distance between two points?

Thank You!

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Re: how to measure a distance between two points

In FUNCTION select INSERT TRENDLINE. LINEAR and then in CALC select LENGTH OF 
PATH

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Re: Beta353 bug - drawing relations hogs the PC

Ivan Johansen <graph <at> padowan.dk> writes:

> That sounds strange. When I try it, it doesn't take more than a second. 
> How fast is your computer? Could Graph still close normally or did you 
> have to kill it? Is it only relations, or does functions also give 
> problems? What about the released Graph 4.2, was it also slow?
> 

OK, I had little time lately, but I managed to do a few tests: the problem is
still there also for beta 362.

I made a comparison test between graph 4.2 and beta 362, therefore PC
configuration shouldn't be affecting the results.

I set up the graph window at 800x600 and plotted the relation x^2 + y^2 = 5;
with graph 4.2 it took about 2sec whereas with beta 362 took about 20sec!!!
Apparently with functions the time is the same.

If I maximize the window (1680x1050) the time increases to about 6sec for 4.2
and more than 90sec for beta362.

BTW, even if it hogs the CPU the beta is still responsive: the computation can
be stopped with ESC, therefore I suppose that some inefficiency has crept in in
the relation plotting algorithm.

Best Regards
Lorenzo

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