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Programming Articles
Page 2255 of 2547
How can Tensorflow be used to download flower dataset into the environment?
The flower dataset can be downloaded using a google API that basically links to the flower dataset. The ‘get_file’ method can be used to pass the API as a parameter. Once this is done, the data gets downloaded into the environment.Read More: What is TensorFlow and how Keras work with TensorFlow to create Neural Networks?We will be using the flowers dataset, which contains images of several thousands of flowers. It contains 5 sub-directories, and there is one sub-directory for every class. We are using the Google Colaboratory to run the below code. Google Colab or Colaboratory helps run Python code ...
Read MoreHow to convert numeric columns to factor using dplyr package in R?
If we have a numeric column in an R data frame and the unique number of values in the column is low that means the numerical column can be treated as a factor. Therefore, we can convert numeric columns to factor. To do this using dplyr package, we can use mutate_if function of dplyr package.Loading dplyr package and converting numerical columns in BOD data set (available in base R) to factor columns −Examplelibrary(dplyr) str(BOD) 'data.frame': 6 obs. of 2 variables: $ Time : num 1 2 3 4 5 7 $ demand: num 8.3 10.3 19 16 15.6 19.8 - ...
Read MoreHow to sort a column of data.table object in ascending order using column name stored in a vector in R?
Sorting a column of data.table object can be done easily with column number but sorting with column name is different. If a column name is stored in a vector and we want to sort a column of data.table object in ascending order using this name then order function will be used with single and double square brackets as shown in the below examples.Loading data.table package and creating a data.table object −Examplelibrary(data.table) x1
Read MoreHow to create an integer64 vector in R?
The integer64 vector contains vector values that represents signed integers with values that range from negative 9,223,372,036,854,775,808 to positive 9,223,372,036,854,775,807. To create an integer64 vector, we can use as.integer64 function of bit64 package. The difference between integer64 vector and others is that a large number of values can be stored in the vector.Examplelibrary(bit64) x1
Read MoreHow to fix the lower value for X-axis in base R
To fix the lower value for X-axis in base R, we can use xlim argument in plot function. Mostly, we set the lower value to zero but it is not necessary it can be something else, either less than zero or greater than zero as well. If only lower value needs to be fixed then upper value will be set by using the max function as shown in the below example.Examplex
Read MoreHow to create a boxplot with log of the variable in base R?
To create a boxplot with log of the variable in base R, we need to use log argument within the boxplot function but we need to carefully pass the Y-axis inside the function because the values of the boxplot are plotted on the Y-axis. For example, if we have a vector called x then the boxplot of log of x will be created as boxplot(x,log="y").Examplex
Read MoreHow to search a directory with file extensions in Java?
Following example prints the files in a directory based on the extensions −Exampleimport java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.util.stream.Stream; public class Demo { public static void main(String[] args) throws IOException { Stream path = Files.walk(Paths.get("D:\ExampleDirectory")); System.out.println("List of PDF files:"); path = path.filter(var -> var.toString().endsWith(".pdf")); path.forEach(System.out::println); path = Files.walk(Paths.get("D:\ExampleDirectory")); System.out.println("List of JPG files:"); path = path.filter(var -> var.toString().endsWith(".jpg")); path.forEach(System.out::println); path = Files.walk(Paths.get("D:\ExampleDirectory")); ...
Read MoreHow to read all files in a folder to a single file using Java?
The listFiles() method of the File class returns an array holding the objects (abstract paths) of all the files (and directories) in the path represented by the current (File) object.To read the contents of all the files in a folder into a single file −Create a file object by passing the required file path as a parameter.Read the contents of each file using Scanner or any other reader.Append the read contents into a StringBuffer.Write the StringBuffer contents into the required output file.Exampleimport java.io.DataOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.util.Scanner; public class Test { public static void main(String ...
Read MoreHow to check for duplicates in data.table object in R?
The checking for duplicates in a data.table object can be easily done with the help of delta ($) operator that is used to access the columns and the duplicated function. For example, if a data.table object DT contains a column x then to check the duplicates in x, we can use the command duplicated(DT$x).Example1Loading data.table object and creating an object −library(data.table) set.seed(141) x
Read MoreHow to get the list of jpg files in a directory in Java?
The String[] list(FilenameFilter filter) method of a File class returns a String array containing the names of all the files and directories in the path represented by the current (File) object. But the retuned array contains the filenames which are filtered based on the specified filter. The FilenameFilter is an interface in Java with a single method.accept(File dir, String name)To get the file names based on extensions implement this interface as such and pass its object to the above specified list() method of the file class.Assume we have a folder named ExampleDirectory in the directory D with 7 files and 2 directories ...
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