[R] Can a data.frame column contain lists/arrays?
I'd like to have a data.frame structured something like the following: d - data.frame ( x=list( c(1,2), c(5,2), c(9,1) ), y=c( 1, -1, -1) ) The reason is this: 'd' is the training data for a machine learning algorithm. d$x is the independent data, and d$y is the dependent data. In general my machine learning code will work where each element of d$x is a vector of one or more real numbers. So for instance, the same code should work when d$x[1] = 42, or when d$x[1] = (42, 3, 5). All that matters is that all element within d$x are lists/vectors of the same length. Does anyone know if/how I can get a data.frame set up like that? Thanks, Christian __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Newbie: how to get unique x unique x aggregate chart?
I'm very new to R, so please forgive me if I just missed the answer in existing documentation... I have a data set with at least three columns, X, Y, and Z. I want to produce a chart where one axis shows all the unique values of X, and the other axis shows all the unique values of Y. Each cell within the chart should contain the result of applying an aggregate function (such as mean(), for example) to Z value of those rows that are associated with that cell (via their X and Y values). Can someone recommend a good way to do this? Thanks very much, Christian [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Newbie: how to get unique x unique x aggregate chart?
Thanks, let me try to clarify my question with an example. Suppose I have the following data: Gender, Major, Course-Grade F, Psy, 3.5 F, Psy, 3.1 M, Hst, 3.7 F, Hst, 3.6 M, Hst, 2.6 M, Eng, 3.9 I want to compute a table like the following: X-axis: Gender Y-axis: Major Cell(x,y) = mean course-grade So for example, with the data above: F M Psy | 3.3NA Hst | 3.63.15 Eng | NA3.9 If I were doing this in SQL I'd do it with a cross-tab query. But the world of R still has much unfamiliar terrain :) Thanks, Christian On 11/15/06, Jeffrey Robert Spies [EMAIL PROTECTED] wrote: I'm not sure I understand the question, but you might look into the following functions: unique heatmap image Again, if I understand the question, you would create a length(unique (x)) by length(unique(y)) sized matrix, and fill it with appropriate values of z. Then pass that to heatmap or image. Hope that helps--feel free to tell me if I've answered the wrong question, Jeff. On Nov 15, 2006, at 8:30 AM, Christian Convey wrote: I'm very new to R, so please forgive me if I just missed the answer in existing documentation... I have a data set with at least three columns, X, Y, and Z. I want to produce a chart where one axis shows all the unique values of X, and the other axis shows all the unique values of Y. Each cell within the chart should contain the result of applying an aggregate function (such as mean(), for example) to Z value of those rows that are associated with that cell (via their X and Y values). Can someone recommend a good way to do this? Thanks very much, Christian [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting- guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Newbie: how to get unique x unique x aggregate chart?
That did it! Thanks Marc. - Christian On 11/15/06, Marc Schwartz [EMAIL PROTECTED] wrote: On Wed, 2006-11-15 at 15:03 -0500, Christian Convey wrote: Thanks, let me try to clarify my question with an example. Suppose I have the following data: Gender, Major, Course-Grade F, Psy, 3.5 F, Psy, 3.1 M, Hst, 3.7 F, Hst, 3.6 M, Hst, 2.6 M, Eng, 3.9 I want to compute a table like the following: X-axis: Gender Y-axis: Major Cell(x,y) = mean course-grade So for example, with the data above: F M Psy | 3.3NA Hst | 3.63.15 Eng | NA3.9 If I were doing this in SQL I'd do it with a cross-tab query. But the world of R still has much unfamiliar terrain :) Thanks, Christian Presuming that DF is a data frame containing your data: with(DF, tapply(Course.Grade, list(Major, Gender), mean, na.rm = TRUE)) FM Eng NA 3.90 Hst 3.6 3.15 Psy 3.3 NA See ?tapply and ?with HTH, Marc Schwartz [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
