Software for Curve Equation Solving

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Discussion Overview

The discussion revolves around the search for software that can generate equations from curves represented in image files, specifically for applications in petroleum engineering. Participants explore various software options, including both paid and free solutions, and discuss methods for digitizing curves from images.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about software that can provide equations for curves from imported images, expressing a need for such a tool in their studies.
  • Another participant mentions that while there are programs available, they tend to be costly and does not specify any particular software.
  • A suggestion is made for a free method using Excel, involving manual work to derive coordinates from graph paper.
  • Several participants discuss the existence of free 'digitizing' programs that allow users to import JPEG images and calibrate them by marking known points, which can then be used to obtain coordinates for further analysis.
  • Engauge is highlighted as a specific freeware option that allows users to import graphs, set axes, and digitize points, ultimately producing a CSV file for use in Excel.

Areas of Agreement / Disagreement

Participants generally agree that there are both paid and free software options available for digitizing curves, but no consensus is reached on specific recommendations or the effectiveness of the mentioned methods.

Contextual Notes

Limitations include the potential variability in software performance, the need for manual calibration, and the dependency on the accuracy of the points marked by users.

ekox
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hi all bros

i am student in pteroleum engineering faculty and i want to know wether there is a software that can give equation for given curve.For example if i import a .jpg file of curve and mark the points in the curve picture and it returns me equation of curve.Is there any such software packages? (sorry for bad english)
 
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There are programmes that will do what you say, but they will cost you and I am afraid I don't know what they are.

Free option is use excel (assuming you have office). Use a printing on graph paper to come up with coordinates manually and then use a best fit line. It's more manual work but it's a cheap option.
 
there are free 'digitizing' programs that allow you to import a jpeg, and then 'calibrate' it by clicking on three points (you click on a point and input the known coordinates of the point). Once you calibrate to three points, the software will provide coordinates of other points as you click on them. This saves the labor of reading graph paper... Then you can cut & paste the digitized points into excel or whatever and do your curve-fitting.
 
As gmax mentioned, there is digitizing software available. I have used a piece of freeware called Engauge (you can find it on Download.com). It's pretty easy, you import the image of the graph, and then set your axis by three points. From there you can either insert points by hand or let it try to auto fill in the curves.

Either way, you get a csv file that you can bring into Excel and create a trendline.
 

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