math software with drawing
 

(sorry if I already asked this)

I need some program for 2D vector drawing that can do simple maths.
for example, signal_level at the beginning of line is x, and at the end its y=x-constant*length_of_line.

I've tried hard to find it (for free), but failed.

thanks.

Hello,

Is this what you are looking for? http://www.skencil.org/

Cheers,

Josh

Thanks, but that seems to be vector drawing only software. I need more than that, some maths and sort of database.

Hmm... The only other big one I know of is inkscape - http://wiki.inkscape.org/wiki/index.php/Inkscape

qrange, what exactly are you trying to do? Do you just want to plot lines giving a gradient and intercept? Are you just looking to make graphs of simple functions like that?

no, I need to draw something like a diagram. where blocks are connected with lines. besides each block or line, there are displayed some variables like signal_level. if I extend the line, that variable changes automatically. variables are calculated by simple formulas.

I've not heard of any software that does this. Is there something you would use under Windows or Mac, for example? One could use Dia for making diagrams like that, but as far as I know, it doesn't do any maths like you want. Out of interest, what is this for? There may be another way to do what you want.

thanks, it would help in designing CATV network (HFC).

I have no idea what either of those terms mean. Please be aware that people generally won't be familiar with terms, unless they know about the relevant field.

Again, is there a piece of software for this that you'd use under some other OS?

sorry, catv is short for cable tv.

yes there is software specialized for that. but its expensive, not free like most of linux stuff.
and it usually runs on windows only.

can you post an example of what it is you want to do
it sounds like something for octave( matab) and gnu-plot

Hello,

I've use the pgf/tikz package for LaTeX when I needed some mathematical drawings http://en.wikipedia.org/wiki/PGF/TikZ
If this doesn't meet your requirements you should also take a look at "Metapost" and "PSTricks" which are also packages for TeX/LaTeX.
All these packages are program-able in that they can do the math on their own, you can work with variables.

Markus