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R Programming Articles
Page 45 of 174
How to put space between words that start with uppercase letter in string vector in R?
To put space between words that start with uppercase letter in string vector in R, we can use gsub function. Since we can have uppercase letters as well as lowercase letters in the string vector hence, we need to properly specify both type of characters for creating the space between words. Check out the below examples to understand how it works.Examplex1
Read MoreHow to extract strings that contains a particular substring in an R vector?
Suppose we have a vector that contains multiple string elements and we want to find out which string element has a particular substring. This can be done with the help of grep function. For example, if we have a vector called x that contains five string elements each of varying length then finding which of the elements has a substring say programming then it can be done by using the command grep("programming",x,fixed=TRUE)Examplex1
Read MoreHow to check whether a particular word exists in an R data frame column?
If we have a character column in an R data frame then we might want to check whether a particular value exist in the column or not. For example, if we have a gender column then we might want to check whether transgender exists in that column or not. This can be done with the help of grepl function. Check out the below examples to understand how it works.Consider the below data frame −Examplex
Read MoreHow to create combination of multiple vectors in R?
To create combination of multiple vectors, we can use expand.grid function. For example, if we have six vectors say x, y, z, a, b, and c then the combination of vectors can be created by using the command expand.grid(x,y,z,a,b,c).Examplex1
Read MoreHow to get the list of available data frames in R environment?
When we perform any type of data analysis, there are many types of objects that are created in the R environment such as vector, data frame, matrix, lists, arrays, etc. If we want to get the list of available data frames in R environment then we can use the below command −names(which(unlist(eapply(.GlobalEnv,is.data.frame))))Examplex1
Read MoreHow to plot time series data with labels in R?
If we have time series data stored in a data frame then plotting the same as a time series cannot be done directly, also the labels for the series might not be possible directly. Therefore, we first need to convert the data frame to a time series object by using the function ts as shown in the below example and then using the plot function to create the plot, this will display the labels for the series as well.Consider the below data frame −ExampleTime
Read MoreHow to find the subtotal in R?
By subtotal we mean finding the sum of values based on grouping column. For example, if we have a data frame called df that contains three numerical columns as x, y, z and one categorical column say Group then the subtotal of x, y, z for each category in Group can be found by using the command aggregate(cbind(x,y,z)~Group,data=df,FUN=sum).Consider the below data frame −Examplex1
Read MoreHow to collapse data frame rows in R by summing using dplyr?
To collapse data frame rows by summing using dplyr package, we can use summarise_all function of dplyr package. For example, if we have a data frame called df that has a categorical column say Group and one numerical column then collapsing of rows by summing can be done by using the command −df%>%group_by(Group)%>%summarise_all(funs(sum))Consider the below data frame −ExampleGroup
Read MoreHow to create a subset using character column with multiple matches in R?
Subsetting is one of the most important aspects of data analysis. One such situation could be subsetting the character column based on multiple values. For example, if a character column of an R data frame has 5 categories then we might want to extract only 2 or 3 or 4 values then it can be done by using the filter function of dplyr package with str_detect function of stringr package.Consider the below data frame −ExampleGroup
Read MoreHow to change the legend shape using ggplot2 in R?
By default, the shape of legend is circular but we can change it by using the guides function of ggplot2 package. For example, if we have a data frame with two numerical columns say x and y, and one categorical column Group then the scatterplot between x and y for different color values of categories in categorical column Group having different shape of legends can be created by using the below command −ggplot(df, aes(x, y, color=Group))+geom_point()+guides(colour=guide_legend(override.aes=list(shape=0)))Here, we can change the shape argument value to any value between starting from 0 to 25.Consider the below data frame −Examplex
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