Graphiing

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Roedy Green - 07 Aug 2007 00:07 GMT

I know of 21 programs that will produce a variety of graphs, yet I
know of not a single one written for Java that will plot a function of
two variables in 3D, producing a surface.

I thought it would be instructive to plot the primitive functions over
the range -10 to 10, + - / (int and float) %

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David Kerber - 07 Aug 2007 14:06 GMT

> I know of 21 programs that will produce a variety of graphs, yet I
> know of not a single one written for Java that will plot a function of
> two variables in 3D, producing a surface.
>
> I thought it would be instructive to plot the primitive functions over
> the range -10 to 10, + - / (int and float) %

What is your question?

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Roedy Green - 08 Aug 2007 00:15 GMT

On Tue, 7 Aug 2007 09:06:20 -0400, David Kerber
<ns_dkerber@ns_WarrenRogersAssociates.com> wrote, quoted or indirectly
quoted someone who said :

>> I know of 21 programs that will produce a variety of graphs, yet I
>> know of not a single one written for Java that will plot a function of
[quoted text clipped - 4 lines]
>
>What is your question?

I thought expressing my ignorance implied the question. Do you know
of a graphing/charting package that will plot of function of two
variables in 3D, producing a surface?

Perhaps it would look like a mosquito net, perhaps a warped grid,
perhaps a 3D viewer that lets you change your point of view to see the
surface from various vantage points.

You could also take my post as a pure comment on the strange state of
affairs that everyone keeps reinventing the wheel but refuses to
invent the steering wheel.

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Roedy Green Canadian Mind Products
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David Kerber - 08 Aug 2007 15:26 GMT

> On Tue, 7 Aug 2007 09:06:20 -0400, David Kerber
> <ns_dkerber@ns_WarrenRogersAssociates.com> wrote, quoted or indirectly
[quoted text clipped - 12 lines]
> of a graphing/charting package that will plot of function of two
> variables in 3D, producing a surface?

Unfortunately, no I don't. That was what I was guessing you meant, but
sometimes questions are posed by non-English speakers which look well-
worded, but don't express what they actually mean; for example, you
might have been asking how to write such a graphing routine yourself.
So I thought it best to clarify before trying to answer.

> Perhaps it would look like a mosquito net, perhaps a warped grid,
> perhaps a 3D viewer that lets you change your point of view to see the
[quoted text clipped - 3 lines]
> affairs that everyone keeps reinventing the wheel but refuses to
> invent the steering wheel.

I imagine that in this case, there is just not enough demand for java-
based 3D plotting. Most 3D graphics apps are pretty demanding of
compute speed, and that is not one of Java's strong points, though it is
certainly sufficient for some applications.

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Roedy Green - 08 Aug 2007 16:37 GMT

On Wed, 8 Aug 2007 10:26:03 -0400, David Kerber
<ns_dkerber@ns_WarrenRogersAssociates.com> wrote, quoted or indirectly
quoted someone who said :

>I imagine that in this case, there is just not enough demand for java-
>based 3D plotting. Most 3D graphics apps are pretty demanding of
>compute speed, and that is not one of Java's strong points, though it is
>certainly sufficient for some applications.

I have been toying with the idea of writing a program to generate a
Pov-Ray program then use that to created a shaded surface, where you
can control the lighting. I will have to look into whether it is
possible to generate a smooth surface from sample points created of a
material that is semi-transparent.

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Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

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Lothar Leidner - 09 Aug 2007 10:37 GMT

Roedy Green schrieb:

> I thought expressing my ignorance implied the question. Do you know
> of a graphing/charting package that will plot of function of two
> variables in 3D, producing a surface?

ImageJ (http://rsb.info.nih.gov/ij/) is an open source image processing
tool written in Java. It contains at least a 3D surface plot.

Regards,

Lothar Leidner

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