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# Implicit plot in mathcad watch

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

eg

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"

2. dont know if it works but try ..instead of y ,use y[x]
3. (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.
4. (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
5. (Original post by Plato's Trousers)
Does anyone know how to plot an implicit function in mathcad?

eg

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"

I know that this does not answer the question asked but I tend to use the free software graphmatica for implicit functions.
6. (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.

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

Another of my favourites my old friend.
8. (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.

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.

See above

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