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    Does anyone know how to plot an implicit function in mathcad?

    eg

    x^3-4xy+2y^2-3y+11=0

    I am not sure how to express this in mathcad so that it will give me a plot of y against x. If you just enter the function as above, and put y and x on the axes of a plot, mathcad just highlights the "x" in red which means "variable undefined"

    Any mathcad experts out there?
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    dont know if it works but try ..instead of y ,use y[x]
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    (Original post by rbnphlp)
    dont know if it works but try ..instead of y ,use y[x]
    you mean on the vertical axis? Yeah, I tried that. No joy.
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    (Original post by Plato's Trousers)
    you mean on the vertical axis? Yeah, I tried that. No joy.
    This is a bit rubbish but it works.

    Type f(x,y) := whatever

    Click contour plot (the funny white symbol with blue lines in it)

    Fill in f in the bottom left placeholder and you will get a contour graph

    Number the contours by rightclicking on the graph, selecting format and then the special tab and contour options, numbered

    The contour numbered 0 is the one you want

    The quickplotdata tab allows you to change the scales
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    (Original post by Plato's Trousers)
    Does anyone know how to plot an implicit function in mathcad?

    eg

    x^3-4xy+2y^2-3y+11=0

    I am not sure how to express this in mathcad so that it will give me a plot of y against x. If you just enter the function as above, and put y and x on the axes of a plot, mathcad just highlights the "x" in red which means "variable undefined"

    Any mathcad experts out there?
    I know that this does not answer the question asked but I tend to use the free software graphmatica for implicit functions.
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    (Original post by H.C. Chinaski)
    I know that this does not answer the question asked but I tend to use the free software graphmatica for implicit functions.
    Microsoft Mathematics is also free and does a good job of this.

    http://www.microsoft.com/downloads/e...f-9e242b794c3a
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    (Original post by Mr M)
    Microsoft Mathematics is also free and does a good job of this.

    http://www.microsoft.com/downloads/e...f-9e242b794c3a
    Another of my favourites my old friend.
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    (Original post by Mr M)
    This is a bit rubbish but it works.

    Type f(x,y) := whatever

    Click contour plot (the funny white symbol with blue lines in it)

    Fill in f in the bottom left placeholder and you will get a contour graph

    Number the contours by rightclicking on the graph, selecting format and then the special tab and contour options, numbered

    The contour numbered 0 is the one you want

    The quickplotdata tab allows you to change the scales
    Ok, thanks, I'll give that a go.

    (Original post by H.C. Chinaski)
    I know that this does not answer the question asked but I tend to use the free software graphmatica for implicit functions.
    Yes, but unfortunately my degree requires mathcad

    (Original post by Mr M)
    Microsoft Mathematics is also free and does a good job of this.

    http://www.microsoft.com/downloads/e...f-9e242b794c3a
    See above
 
 
 
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