good work!

hey, i think you guys did an extraordinary good job creating this program! it
really helps me doing my homework!
thanks a lot!

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simply a try

simply a try

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SV: simply a try

???

________________________________

Fra: graph-support-admin <at> lists.sourceforge.net på vegne af simply a try
Sendt: fr 10-02-2006 08:50
Til: graph-support <at> lists.sourceforge.net
Emne: [Graph-support] simply a try

simply a try

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Re: user guide

I'm putting together a use-case guide for people to use.  If you're interested,
check it out at http://graphguide.blogspot.com/  I'm hoping to post many more
examples.  But, I could use input from users.

Thanks
-Shri-


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Great Program, but....

Re: Great Program, but....

Michael Lee wrote:
> When I graph x^(1/3) I only get from 0 <= x drawn.  Now either, I was 
> taught wrong, my TI-89 is wrong, my TI-83 is wrong, or Graph has a small 
> bug.

 From the FAQ:
Q: Why is the negative part of the function f(x)=x^(1/3) not shown?
A: This is because all calculations in Graph are done with floating 
point numbers and not with rational numbers. Instead you can use the 
root function, which will draw correctly for integer roots: f(x)=root(3, 
x). The function f(x)=x^(2/3) can be written as root(3, x)^2. Notice 
that Calculate with complex numbers in the Edit|Options dialog must be 
disabled.

Best regards
Ivan Johansen

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Re: Great Program, but....

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

> 
> Michael Lee wrote:
> > When I graph x^(1/3) I only get from 0 <= x drawn.  Now either, I was 
> > taught wrong, my TI-89 is wrong, my TI-83 is wrong, or Graph has a small 
> > bug.
> 
>  From the FAQ:
> Q: Why is the negative part of the function f(x)=x^(1/3) not shown?
> A: This is because all calculations in Graph are done with floating 
> point numbers and not with rational numbers. Instead you can use the 
> root function, which will draw correctly for integer roots: f(x)=root(3, 
> x). The function f(x)=x^(2/3) can be written as root(3, x)^2. Notice 
> that Calculate with complex numbers in the Edit|Options dialog must be 
> disabled.
> 
> Best regards
> Ivan Johansen
> 
> -------------------------------------------------------

Ivan,

I've enjoyed using your program for a long time now.  It's a great tool.  More
importantly, I wanted to say thank you for your replies to all the questions
that people send your way.  It's a lot of work and I appreciate it very much.

Thanks,
-Shri-


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a suggestion

Hello,

I have several suggestions to improve graph:

1) to add a new tab in the function menu, say "add function"
that will work basically like "custom function", but will 
save the user defined functions FOR ALL sessions of graph 
(that is, these functions will be available at startup).

2) (more difficult). I think that the the graphs are perfect for being 
viewed at screen, but much less perfect as they are printed.
I know nothing about the source code of graph, but I think this is
because the point approximation is too large. It will be nice to give
Graph the ability to prepare file to be printed (perhaps in ps format) such
that they will appear smooth and nice. To do such, and in order not to compute 
too many point, it may be a good idea to keep the same array of points already 
computed by graph (perhaps with a better approximation), and to join them with 
some Bezier interpolation curve.  

3) (much more difficult). In the long term, why not add to graph 3d abilities?
Well, this is very is difficult, not only from the point of view of the 
programation but also from the point of view of the design: how making this in 
order to respect the Graph design feeling? perhaps it will be a good idea to 
find volunteers that will help to develop this aspect of the program?

Graph is the best,
Mike.  

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correction: a suggestion

Mike <mb_zoro <at> netvision.net.il> writes:

> 2) (more difficult). I think that the the graphs are perfect for being 
> viewed at screen, but much less perfect as they are printed.
> I know nothing about the source code of graph, but I think this is
> because the point approximation is too large. It will be nice to give
> Graph the ability to prepare file to be printed (perhaps in ps format) such
> that they will appear smooth and nice. To do such, and in order not to 
compute 
> too many point, it may be a good idea to keep the same array of points 
already 
> computed by graph (perhaps with a better approximation), and to join them 
with 
> some Bezier interpolation curve.  

Sorry, I forgot that because of some bug related to the communication between 
Graph and my printer, I use to convert the graph files to image files and then 
to print them. I think that for those who can use directly the print tab, the 
curves are fine. Nevertheless, it may still be a good idea to give the ability 
to Graph to convert to ps format (e.g. for inclusion in TeX files).

Mike.

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Re: a suggestion

Mike wrote:
> 1) to add a new tab in the function menu, say "add function"
> that will work basically like "custom function", but will 
> save the user defined functions FOR ALL sessions of graph 
> (that is, these functions will be available at startup).

Thanks for the suggestion. I will try to get it into one of the next 
versions.

> It will be nice to give
> Graph the ability to prepare file to be printed (perhaps in ps format) such
> that they will appear smooth and nice. To do such, and in order not to compute 
> too many point, it may be a good idea to keep the same array of points already 
> computed by graph (perhaps with a better approximation), and to join them with 
> some Bezier interpolation curve.  

I have already been looking at eps files, but it turned out to be much 
more difficult than I anticipated. But I plan to give it another try later.

> Sorry, I forgot that because of some bug related to the communication between 
> Graph and my printer, I use to convert the graph files to image files and then 
> to print them. I think that for those who can use directly the print tab, the 
> curves are fine. 

Unfortunately there are problems printing with some printers. Printing 
seems to be the most difficult thing to get working. But when it works 
Graph will use the native resolution of the printer, which should give 
the best result.

When you save as an image and print that, you will probably get the best 
result if you use a metafile (emf) instead of a bitmap.

> Nevertheless, it may still be a good idea to give the ability 
> to Graph to convert to ps format (e.g. for inclusion in TeX files).

Yes, I hope I will be able to make it work in a later version, and I am 
glad to hear that there is an interest for it.

> 3) (much more difficult). In the long term, why not add to graph 3d abilities?
> Well, this is very is difficult, not only from the point of view of the 
> programation but also from the point of view of the design: how making this in 
> order to respect the Graph design feeling? 

I have it on my todo list, but as you say yourself it is much more 
difficult. It will probably take some time before I have it implemented 
as there are a lot of easier things I like to implement first.

> perhaps it will be a good idea to 
> find volunteers that will help to develop this aspect of the program?

I rather want help with more local things, like creating eps files or 
updating the help file, instead of 3D abilities which requires a major 
redesign. Unfortunately I don't know how to find such help.

Best regards
Ivan Johansen

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