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An offline tool where i can draw lines and get functions?

Anonymous Wed 16 Oct 2024 20:53:25 No.1495244 View View Reply Original Report

I want to draw lines and GET the functions as the output.
There are plenty of online calculators that do the opposite: You input a function and get the graph, i want THE OPPOSITE.
So i can draw a bunch of random lines and get the functions that would create them as the output.

Anyone knows an offline tool that can do this?
Please only recommend software you have personally tested and does this, I have seen this question in stack countless times and people misunderstand it, they recommend generic graphic calculators.

Anonymous

Anonymous Thu 17 Oct 2024 01:23:15 No.1495271 Report

Quoted By:

>>1495244
You don't draw graphs to get a function, you input an arbitrary set of points and attempt to interpolate a function that fits those points. You might want to call it drawing a graph but implicitly you're inputting points. For a straight line it's one point at the start and one point at the end. For a curved line you've got those points plus probably at least one intermediate point for a spline.

Any such interpolation is very likely to be an estimate only especially as a graph is a very poor way of inputting points. As well your values have to be able to fit exactly into a computer's ability to represent them. This might work for integer values but it will fail for others due to the lack of infinite precision in digital representation of decimals so you end up with an approximation over a certain range.

Even spreadsheets implement curve fitting through regression but there you have to have some idea of the function you're attempting to find and if one curve doesn't fit you try another.

There are various methods developed to interpolate polynomials and periodic functions but you won't be inputting points on a graph like you've drawn because that has an infinite number of points and that would require an infinite number of calculations. You can approximate a triangular wave with a Fourier series but the Fourier series will never result in an exact output equation such as you have indicated you want. For determined polynomials you can get exacted equations but overdetermined polynomials often result in approximations and "a bunch of random lines" aren't likely to a polynomial just as that graph you provided isn't a polynomial.

Anonymous

Anonymous Thu 17 Oct 2024 01:43:24 No.1495277 Report

Quoted By:

>>1495244
Maybe try this
https://github.com/MrPancakes39/Desmos-Offline-Mode/tree/archive/main

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An offline tool where i can draw lines and get functions?