similar to: %*% what does this mean

myDF <- data.frame(a = c("<0.1", NA, 0.3, 5, "Nil"), b = c("<0.1", 1, 0.3, 5, "Nil"), stringsAsFactors = FALSE) # you can subset the b-column in several ways myDF[ , 2] myDF[ , "b"] myDF$b # using the column, you make a logical vector ! is.na(as.numeric(myDF$b)) # This can be used to select the

Always via logical expressions. In this case you can use the logical expression myDF$b != "0" to give you a vector of TRUE/FALSE B. > On Sep 25, 2017, at 8:00 AM, Shane Carey <careyshan at gmail.com> wrote: > > This is super, really helpfull. Sorry, one final question, lets say I wanted to remove 0's rather than NAs , what would it be? > > Thanks >

Hi, Lets say this was a dataframe where I had two columns a <- c("<0.1", NA, 0.3, 5, "Nil") b <- c("<0.1", 1, 0.3, 5, "Nil") And I just want to remove the rows from the dataframe where there were NAs in the b column, what is the syntax for doing that? Thanks in advance On Fri, Sep 22, 2017 at 5:04 PM, Shane Carey <careyshan at

This is super, really helpfull. Sorry, one final question, lets say I wanted to remove 0's rather than NAs , what would it be? Thanks On Mon, Sep 25, 2017 at 12:41 PM, Boris Steipe <boris.steipe at utoronto.ca> wrote: > myDF <- data.frame(a = c("<0.1", NA, 0.3, 5, "Nil"), > b = c("<0.1", 1, 0.3, 5, "Nil"), >

Super, Thanks On Fri, Sep 22, 2017 at 4:57 PM, Boris Steipe <boris.steipe at utoronto.ca> wrote: > > a <- c("<0.1", NA, 0.3, 5, "Nil") > > a > [1] "<0.1" NA "0.3" "5" "Nil" > > > b <- as.numeric(a) > Warning message: > NAs introduced by coercion > > b > [1] NA NA 0.3

What does these operators do: %*% Thanks -- Shane [[alternative HTML version deleted]]

Hi, I have a histogram with values logged to the base 10 hist(log10(x),breaks=60) How do I show the log values on the x-axis and a second x-axis showing the real values? Thanks -- Shane [[alternative HTML version deleted]]

Hi, How do I extract just numbers from the following list: a=c("<0.1",NA,0.3,5,Nil) so I want to obtain: 0.3 and 5 from the above list Thanks -- Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* [[alternative HTML version deleted]]

> a <- c("<0.1", NA, 0.3, 5, "Nil") > a [1] "<0.1" NA "0.3" "5" "Nil" > b <- as.numeric(a) Warning message: NAs introduced by coercion > b [1] NA NA 0.3 5.0 NA > b[! is.na(b)] [1] 0.3 5.0 B. > On Sep 22, 2017, at 11:48 AM, Shane Carey <careyshan at gmail.com> wrote: > > Hi,

Hi, How do I write a superscript within gsub? I have the following: gsub("_mgkg",expression(paste("mg kg"^{-1})),names[1]) Thanks -- Shane [[alternative HTML version deleted]]

Hi, I have a set of x, y points where x represents dates and y actual values. I am trying to plot a line graph of the data with points on top, but R is connecting the wrong points with lines. Does anyone know how I can rectify this. Please see sample below: x= 24/09/2009 09:13 16/10/2009 11:17 24/10/2009 21:43 11/09/2009 18:34 22/08/2009 15:45 10/08/2009 00:30 14/08/2009 14:52 24/09/2009

I was thinking of splitting the y-axis into two? Is this possible? Thanks -- Shane [[alternative HTML version deleted]]

I have x, y, z data. The x, y fields dont change but Z does. How do I add a very small number onto the end of each x, y data point. For example: Original (X) Original (Y) Original (Z) 15 20 30 15 20 40 New (X) New (Y)

Hi, I have a string of text as follows "LOI ." How do I replace the dot with "(%)" gsub(".","(%)",LOI .) gives "(%)(%)(%)(%)(%)" Thanks -- Shane [[alternative HTML version deleted]]

Hi, Rather than a graph label to display labels as 0e+00, how do I get it to display the real value? Thanks -- Shane [[alternative HTML version deleted]]

Hi, Can R read in .xyz files? If so, what is the package, thanks -- Shane [[alternative HTML version deleted]]

Hi, Im reading in a .txt file into R that consists of 5 columns, however, when imported into R, it reads all the data into just one column. Is there a way of telling R to create a dataframe with 5 columns rather than putting all the data into one column? Thanks -- Shane [[alternative HTML version deleted]]

Hi, I have a 3-d geology problem. I have an xyz fault data set. I am able to view the data set in R using plot3-d but cannot create a raster from it. I need to create a raster and export so that it can be read in arcscene. Can anybody help? Thanks -- Shane [[alternative HTML version deleted]]

Hi, I am trying to create a Cumulative Frequency graph and I am using the following example: http://www.r-tutor.com/elementary-statistics/quantitative-data/cumulative-frequency-graph When I plot this data, how do I put in "real values" on the x-axis, rather than the values that are used for the breaks Thanks -- Shane [[alternative HTML version deleted]]

Hi, I would like to put the sample number beside each lable in a boxplot. How do I do this? Essentially, I need to count the sample size for each factor, see below: Thanks boxplot(DATA$K_Merge~factor(DATA$UnitName_1),axes=FALSE,col=colours) title(main=list("Tukey Boxplot by Geology:\n K(%)",cex=cexlb)) axis(1, 1:21, labels=FALSE, las=2) text(seq(1, 21, by=1), par("usr")[3],