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Graph something freehand, then it gives the function..how?

  1. Aug 7, 2015 #1
    • Member warned about posting vague, unclear questions.
    How or where can I do this? thanks
     
  2. jcsd
  3. Aug 7, 2015 #2
    Not sure what you mean. Any recipe that gives one output for a given input can be considered a mathematical function.

    For properly labeled graphs where the axes for the input and output are defined, this can be done.
     
  4. Aug 7, 2015 #3
    I know I didn't explain it very well. This is what I mean: I draw some random curvy line and some app or software tells me the function of what I just drew. Is there some app that does this? thanks for the reply
     
  5. Aug 7, 2015 #4

    Mark44

    Staff: Mentor

    The software can't tell you what the function is in all cases -- the best it can usually do is to approximate the curve (or a section of the curve) with a polynomial or other function, using some of the points on the curve.
     
  6. Aug 7, 2015 #5

    jedishrfu

    Staff: Mentor

  7. Aug 7, 2015 #6

    symbolipoint

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    Unclear. You must fit some numbers to what you drew, and then if expecting to use a software program, give the values to the program and run the program to produce an equation.
     
  8. Aug 7, 2015 #7

    symbolipoint

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    You are asking about the topic of Curve Fitting. One begins developing skills for this in Basic/Beginning Algebra.
     
  9. Nov 4, 2015 #8
    Hello guys I'm tryng to help a student from high school to create a function from the shape of a structure, and I was thinking about drawing something like the structure and
    try to find a function from it.
    Does someone could give me some help?
     
  10. Nov 4, 2015 #9

    symbolipoint

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    You need good reliable values if you want to make a meaningful graph and find a reliable function or equation.
     
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