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Math Help - Wanted: Online / Free Software Calculator For Limit Formulas. Create Tables-Graphs

  1. #1
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    Question Wanted: Online / Free Software Calculator For Limit Formulas. Create Tables-Graphs

    Can you advise of a website or free software application where I can access a scientific calculator the capability to solve a function such as

    f(x) = (x^2 -1) / (ln x + x+1 )

    where I can enter the function and then enter any variable for x, without having to re-enter the function each time.


    I also wish the calculator to be able to create a table of x and f(x) values around a specified x value or limit, and create a graph of the function.
    Thanks from RLBrown
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    Re: Wanted: Online / Free Software Calculator For Limit Formulas. Create Tables-Graph

    what comes in my mind is Wolfram|Alpha: Computational Knowledge Engine , but the result you would get depend on how you will enter the data,

    cheers,
    dokrbb
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    Re: Wanted: Online / Free Software Calculator For Limit Formulas. Create Tables-Graph

    Sounds like microsoft excel would do the job. You don't need anything fancy except for finding the solution to the equation, you could make a simple calculator using Newton's method and use finite differences if you dont want to get the derivative yourself for each function.
    Last edited by Shakarri; May 17th 2014 at 08:07 AM.
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    Re: Wanted: Online / Free Software Calculator For Limit Formulas. Create Tables-Graph

    Quote Originally Posted by TomBrooklyn View Post
    Can you advise of a website or free software application where I can access a scientific calculator the capability to solve a function such as
    f(x) = (x^2 -1) / (ln x + x+1 )
    I also wish the calculator to be able to create a table of x and f(x) values around a specified x value or limit.
    Example

    Quote Originally Posted by TomBrooklyn View Post
    Can you advise of a website or free software application where I can access a scientific calculator the capability to solve a function such as
    f(x) = (x^2 -1) / (ln x + x+1 )
    I also wish the calculator to be able to create a graph of the function.
    Example

    Quote Originally Posted by TomBrooklyn View Post
    Can you advise of a website or free software application where I can access a scientific calculator the capability to solve a function such as
    f(x) = (x^2 -1) / (ln x + x+1 )
    where I can enter the function and then enter any variable for x, without having to re-enter the function each time.
    That "Manipulation" feature costs money.
    Thanks from emakarov
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    Re: Wanted: Online / Free Software Calculator For Limit Formulas. Create Tables-Graph

    Hi,
    There are several free programs that fit your requirements. Here's one used by a lot of people:
    Graph | Plotting of mathematical functions

    As with any software, there is the problem of learning to use it. I think Graph is one of the easiest to learn.
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    Re: Wanted: Online / Free Software Calculator For Limit Formulas. Create Tables-Graph

    Thanks to everyone who has offered a suggestion so far. I will reply herein to each.

    Quote Originally Posted by dokrbb View Post
    what comes in my mind is Wolfram|Alpha: Computational Knowledge Engine , but the result you would get depend on how you will enter the data
    I was able to get a graph for the equation, and a derivative; but I couldn't get table of values for x and y or the limit of the function for a particular point. I saw a place to enter lim => 0, but I didn't seem to be able to incorporate it, and I actually need a one sided limit which wasn't even offered.

    Quote Originally Posted by Shakarri View Post
    Sounds like microsoft excel would do the job. You don't need anything fancy except for finding the solution to the equation, you could make a simple calculator using Newton's method
    This looks like it might work. I will try it.

    Quote Originally Posted by Shakarri View Post
    Sounds like microsoft excel would do the job. You don't need anything fancy except for finding the solution to the equation, you could make a simple calculator using Newton's method and use finite differences if you dont want to get the derivative yourself for each function.
    I wasn't familiar with this Newton's method on Excel; so by searching I found some information about it. I don't understand how it relates to what I'm looking for. Also, I don't have Excel but I have Open Office Calc and Libre Office Calc. They might do the same thing, but that is not assured.
    Last edited by TomBrooklyn; May 19th 2014 at 05:14 AM. Reason: to add responses to all three thread responders
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