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Math Help - Please help me construct a graph...

  1. #1
    Member elninio's Avatar
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    Please help me construct a graph...

    I have no experience with this sort of problem.

    I've only ever made simple graphs before. This one requires special computer software.

    For now, the problem is simple...

    I have derived a formula for a simple model of a star:

    P=P_0 (r/r_0)^a ; T=T_0 (r/r_0)^b

    I need to make a graph of a vs b.

    This is where I'm begging you to help me. What (free) program could I use? Could anyone provide instructions on how to graph this with the program?

    I thank you very very much in advance!
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by elninio View Post
    I have no experience with this sort of problem.

    I've only ever made simple graphs before. This one requires special computer software.

    For now, the problem is simple...

    I have derived a formula for a simple model of a star:

    P=P_0 (r/r_0)^a ; T=T_0 (r/r_0)^b

    I need to make a graph of a vs b.

    This is where I'm begging you to help me. What (free) program could I use? Could anyone provide instructions on how to graph this with the program?

    I thank you very very much in advance!
    Plot what against what? Are you sure you want a against b?

    CB
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  3. #3
    Member elninio's Avatar
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    Positive. In these equations, r is radius, and r0, P0, and T0 are all positive constants. This is keeping in mind that the temperature, pressure, and density all decrease with radius.

    After I graph it, I'll have to point out three regions of the graph (convectively stable, unstable and non-physical)
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