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Articles by Nizamuddin Siddiqui
Page 41 of 196
How to remove row that contains maximum for each column in R data frame?
To remove row that contains maximum for each column in R data frame, we can follow the below steps −First of all, create a data frame.Then, remove the rows having maximum for each column using lapply and which.max function.Create the data frameLet's create a data frame as shown below −> x1 x2 df dfOn executing, the above script generates the below output(this output will vary on your system due to randomization) − x1 x2 1 9 10 2 1 9 3 8 9 4 7 6 5 4 10 6 4 7 7 8 8 8 5 13 9 4 ...
Read MoreHow to combine multiple R data frames that contains one common column?
To combine multiple R data frames that contains one common column, we can follow the below steps −First of all, create a number of data frames.Then, use join_all function from plyr package to combine the data frames.Create the data frameLet's create a data frame as shown below −> x y1 df1 df1On executing, the above script generates the below output(this output will vary on your system due to randomization) − x y1 1 A 6 2 B 10 3 A 4 4 C 5 5 C 3 6 C 6 7 B 2 8 B 10 9 D 1 ...
Read MoreHow to display ID column values in a scatterplot created with ggplot2 in R?
To display ID column values in a scatterplot created with ggplot2 in R, we can follow the below steps −First of all, create a data frame.Then, create the scatterplot using ggplot2.After that, create the same plot with label argument inside aes and add the geom_text function.Create the data frameLet's create a data frame as shown below −> ID x y df dfOn executing, the above script generates the below output(this output will vary on your system due to randomization) − ID x y 1 1 -0.6980655 0.4815529 2 2 1.0943027 0.2476090 3 ...
Read MoreHow to merge two data frames of different length having same values in all columns but at different positions?
To merge two data frames of different length having same values in all columns but at different positions, we can follow the below steps −First of all, create two data frames.Then, merge them using merge function with all argument set to FALSE.Create the data frameLet's create a data frame as shown below −> x y z df1 df1On executing, the above script generates the below output(this output will vary on your system due to randomization) −Output x y z 1 2 3 5 2 3 3 2 3 5 3 1 4 1 2 3 5 1 3 2 6 ...
Read MoreHow to find the sum of numerical columns based on the combination of values inncategorical columns in R data frame?
To find the sum of numerical columns based on the combination of values in categorical columns in R data frame, we can follow the below steps −First of all, create a data frame.Then, find the sum of numerical columns based on the combination of values in categorical columns by using recast function of reshape2 package with sum function.Create the data frameExampleLet's create a data frame as shown below −> x1 x2 x3 x4 f1 f2 df dfOn executing, the above script generates the below output(this output will vary on your system due to randomization) −Output x1 x2 x3 x4 f1 ...
Read MoreHow to remove scientific notation form base R plot?
To remove scientific notation form base R plot, we can follow the below steps −First of all, create a vector and its plot using plot function.Then, use options(scipen=999) to remove scientific notation from the plot.Create the vector and plotUsing sample function to create a vector and plot the vector with plot function −> x plot(x)OutputRemove the scientific notation from the plotUse options(scipen=999) function and again create the same plot −> x options(scipen=999) > plot(x)Output
Read MoreHow to add a regression line to a plot in base R if intercept and slope are given?
To add a regression line to a plot in base R if intercept and slope are given, we can follow the below steps −First of all, create two vectors and the scatterplot between them.Then, use abline function to create the regression line with intercept and slope given by a and b respectively.Create the vectors and scatterplotUse plot functions to create scatterplot between two random vectors x and y −> x y plot(x, y)OutputAdd regression line with given intercept and slopeExampleUsing abline function to add the regression line to the scatterplot with given intercept a = 0.51 and slope = -1.05 ...
Read MoreHow to create an ID column for the combination of values in multiple columns in R data frame?
To create an ID column for the combination of values in multiple columns in R data frame, we can follow the below steps −First of all, create a data frame.Then, create an ID column using as.numeric, as.factor and with function for the combination of values in columns of the data frame.Create the data frameLet's create a data frame as shown below −> x1 x2 df dfOn executing, the above script generates the below output(this output will vary on your system due to randomization) − x1 x2 1 0 1 2 0 1 3 0 1 4 2 2 5 4 ...
Read MoreHow to check whether the difference between previous and current value in a column of an R data frame is 1?
To check whether the difference between previous and current value in a column of an R data frame is 1, we can follow the below steps −First of all, create a data frame.Then, create a custom function for the difference between previous and current value.Now, use the function to check the difference.Example1Create the data frameLet's create a data frame as shown below −> x df1 df1On executing, the above script generates the below output(this output will vary on your system due to randomization) − x 1 1 2 2 3 3 4 4 5 ...
Read MoreHow to create a histogram with Y-axis values as count using ggplot2 in R?
To create a histogram with Y-axis values as count using ggplot2 in R, we can follow the below steps −First of all, create a data frame.Then, use geom_histogram function of ggplot2 package with aes to create the histogram with Y-axis values as count.Create the data frameLet's create a data frame as shown below −> df head(df, 20)On executing, the above script generates the below output(this output will vary on your system due to randomization) − x 1 -0.008015477 2 -0.981227322 3 1.144050354 4 0.207177231 5 0.179782914 6 ...
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