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Thread: Program for graphing linear equations and quadratics?

  1. #1
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    Program for graphing linear equations and quadratics?

    . What I am looking for is a graphing program that can graph linear, circle, and quadratic equations EXACTLY as they are written. I have tried KMPlot and QTOctave and they aren't what I'm looking for. One thing I like to do when teaching math is to have my students demonstrate their graphing on the board over a graph projected by my computer. then, I want the students to input the equation into a program to check their work. Is there anything out there that will let me do that? Or is there a way I can tweak the aforementioned programs to do what I want?

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    Re: Program for graphing linear equations and quadratics?

    did you see this in the forums?

    http://ubuntuforums.org/showthread.php?t=1628660

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    Re: Program for graphing linear equations and quadratics?

    One I've heard of is gnuplot, however I haven't used it before so can't tell you anything about it other than it's name.
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    Re: Program for graphing linear equations and quadratics?

    Thanks for the link. Unfortunately, nothing there is student-friendly.

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    Re: Program for graphing linear equations and quadratics?

    Kmplot. The syntax is super easy, it supports several different graphing modes like cartesian, parametric, etc. and will show derivatives at the click of a check box. It's in the repositories. Because it's a KDE program, it sometimes might act a little strange under Gnome, but the only thing I have encountered so far is that it says it crashed when the reality is that you closed out of the program.

    Anyway, Kmplot is, IMHO, by far the best graphing application available to Ubuntu users. It also prints graphs so that you can include them in presentations, etc...

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    Re: Program for graphing linear equations and quadratics?

    Quote Originally Posted by nickleboyblue View Post
    Kmplot. The syntax is super easy, it supports several different graphing modes like cartesian, parametric, etc. and will show derivatives at the click of a check box. It's in the repositories. Because it's a KDE program, it sometimes might act a little strange under Gnome, but the only thing I have encountered so far is that it says it crashed when the reality is that you closed out of the program.

    Anyway, Kmplot is, IMHO, by far the best graphing application available to Ubuntu users. It also prints graphs so that you can include them in presentations, etc...
    I have this one. And while it can graph in slope-intercept form and in quadratic form, it just dies in linear form (ax+by=c). I don;t suppose you know a way around that, do you?

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    Re: Program for graphing linear equations and quadratics?

    Quote Originally Posted by wangsuda View Post
    I have this one. And while it can graph in slope-intercept form and in quadratic form, it just dies in linear form (ax+by=c). I don;t suppose you know a way around that, do you?
    Why not just rearrange it to y = (c - ax) ÷ b ?

    Or was that a stupid question?
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    Re: Program for graphing linear equations and quadratics?

    Not stupid at all and that is what I've been doing. My pipe dream, however, is to have students input exactly what they are graphing, so they can see if their answer is correct or not.

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    Re: Program for graphing linear equations and quadratics?

    tried geogebra? Online applet works a treat.
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    Re: Program for graphing linear equations and quadratics?

    y = f(x). y is your dependent variable and f(x) is a function of your independent variable, x. You can call these variables whatever you like: banana = f(apples), hippos = f(pink elephants) etc. But a plotting program will demand that you have the equation in this form: dependent variable = some function of the independent variable.

    Plotting "arbitrary constant = dependent variable minus some function of the dependent variable" makes very little logical sense, as the pltting program will need to rearrange the equation into the form y = f(x) in order to determine the value of y for a given value of x. (Alternatively, it will think c is the dependent variable and then get very confused.) So essentially, don't get your kids to plot c = f(x) - y; get them to do it properly!

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