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Do you know how to convert existing graph into coding. I don't have the equations. I have the graph picture in my textbook but i need it to include in my matlab apps

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Do you know how to convert existing graph into coding. I don't have the equations. I have the graph picture in my textbook but i need it to include in my matlab apps
For an example for this graph, i have the bundle diameter= 0.6m
I choose split ring floating head, and the MALTAB app designer can calculate the shell inside diameter. So if we do it manually i will get the value of 62 mm.

Answers (1)

John D'Errico
John D'Errico on 31 Oct 2023
I'm sorry. There is no magic way to know the formula of a given graph in a textbook. And no magic way to just turn that graph into a formula, after copying the image into MATLAB. (Yes, you could do things, but that would take some image processing expertise on your part.)
However, nothing stops you from taking individual points off that curve. You already did that once. Then you can type the values you get into MATLAB, as a pair of vectors with multiple points in each. Finally call polyfit. A linear or at worst, a quadratic polynomial would seem to suffice here. Then use the resulting polynomial in your code.
  5 Comments
Subathra Nilamegan
Subathra Nilamegan on 9 Nov 2023
@John D'Errico Hello, I have found a way to plot that. I used a website called Web Plot Digitizer to extract data, and then import the data into MATLAB to plot.

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