Contour plot 2005-02-09 - By Mulholland, Tom
x <- rep(seq(1,10),10)
y <- rep(seq(1,10),each = 10)
z <- matrix(100 + x*0.5 + y*0.5,ncol=10,byrow=T)
contour(z)
or back to where you were originally
x <- 1:10
y <- 1:10
# z <- 100:110
z <- 1:100
contour(matrix(z,ncol=10))
read the help on contour it states that
z: a matrix containing the values to be plotted ('NA's are
allowed). Note that 'x' can be used instead of 'z' for
convenience.
So
contour(matrix(runif(100),ncol=10))
works
I can't actually say why there is an x and a y
x <- log(1:10)
y <- log(1:10)
z <- 1:100
contour(matrix(z,ncol=10))
did not do what I expected it to do. I expected the contour lines to become
compressed gradually.
> -----Original Message-----
> From: dhkblaszyk@(protected) [mailto:dhkblaszyk@(protected)]
> Sent: Wednesday, 9 February 2005 12:44 AM
> To: r-help@(protected)
> Subject: Fw: [R] Contour plot
>
>
> I understand that I need to have a (in this case) square
> matrix with all the
> data. But the question now is;
>
> - can the contourplot not interpolate the missing values
What missing values? A 10 by 10 grid is 100 possibilities, you gave 10. Which
10?
x <- 1:10
y <- 1:10
z <- matrix(numeric(100),ncol=10)
diag(z) <- 1:10
contour(z)
or
x <- 1:10
y <- 1:10
z <- matrix(numeric(100),ncol=10)
z[trunc(runif(10) * 100)] <- 1:10
contour(z)
are two possibilities
>
> or alternatively
>
> - I have fit a model to the z data (z = 100 + 0.5x + 0.5y).
> How can I make
> from this model a "square" matrix z to make a contour plot?
>
> Kind regards, Darius Blaszijk
>
> ----- Original Message -----
> From: "Achim Zeileis" <Achim.Zeileis@(protected)>
> To: <dhkblaszyk@(protected)>
> Cc: <r-help@(protected)>
> Sent: Tuesday, February 08, 2005 1:51 AM
> Subject: Re: [R] Contour plot
>
>
> > On Tue, 8 Feb 2005 01:15:06 +0100 dhkblaszyk@(protected) wrote:
> >
> > > Hello,
> > >
> > > I would like to make a contourplot of the following data;
> > >
> > > > x <- 1:10
> > > > y <- 1:10
> > > > z <- 100:110
> > >
> > > By doing >contour(x,y,z) I get the following error;
> > >
> > > "Error in contour.default(x, y, z) : no proper `z' matrix
> specified"
> > >
> > > How do I fix this??
> >
> > x and y specify a grid and thus z must provide a value for each
> > combination of the x's and y's! For example:
> > x <- y <- 1:10
> > contour(x, y, outer(x, y))
> > Also look at
> > outer(x, y)
> > and read ?contour.
> >
> > Z
> >
> > > Kind regards, Datius Blaszijk
> > >
> > > [[alternative HTML version deleted]]
> > >
> > > ______________________________________________
> > > R-help@(protected) mailing list
> > > https://stat.ethz.ch/mailman/listinfo/r-help
> > > PLEASE do read the posting guide!
> > > http://www.R-project.org/posting-guide.html
> > >
>
> ______________________________________________
> R-help@(protected) mailing list
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> PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
>
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