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Nizamuddin Siddiqui has Published 2307 Articles
![Nizamuddin Siddiqui](https://www.tutorialspoint.com/assets/profiles/218290/profile/60_42434-1594357075.jpg)
Nizamuddin Siddiqui
247 Views
We might want to find the position of a value in a matrix column which is less than a certain value. This will help us to identify the position of critical or threshold values in each column. For example, if we have a matrix M that contains 5 rows and ... Read More
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Nizamuddin Siddiqui
635 Views
Subsetting of factor columns can be done by creating an object of all columns using sapply with is.factor to extract only factor column in the future then passing that object into subsetting operator single square brackets. For example, if we have a data frame df that contains three columns x, ... Read More
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Nizamuddin Siddiqui
445 Views
In general, the default shape of points in a scatterplot is circular but it can be changed to other shapes using integers or sequence or the variable. We just need to use the argument shape inside geom_point function and pass the variable name. For example, if we want to create ... Read More
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Nizamuddin Siddiqui
20K+ Views
To remove the row names or column names from a matrix, we just need to set them to NULL, in this way all the names will be nullified. For example, if we have a matrix M that contain row names and column names then we can remove those names by ... Read More
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Nizamuddin Siddiqui
2K+ Views
The replication of matrix by rows means that repeating a matrix one or more times but row-wise. For example, if we have a matrix that contains only one row and three columns then the replication of that matrix three times will repeat that one row three times. This can be ... Read More
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Nizamuddin Siddiqui
184 Views
If we have a list of website links and we want to extract the website name from those links then it is a time-consuming task because we would need to copy each name one-by-one. Therefore, it is better to extract them using a function in R and save time. To ... Read More
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Nizamuddin Siddiqui
512 Views
To display a particular part of independent variable in a plot, we might want to use a horizontal line. This will make the plot look different and get the attention of the viewer. To create a horizontal line in a plot, we can use geom_line function but we need to ... Read More
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Nizamuddin Siddiqui
2K+ Views
When we import data from outside sources then the header or column names might be imported with underscore separated values and this is also possible if the original data has the same format. Therefore, to make the headers shorter and look better we would prefer to remove the underscore sign ... Read More
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Nizamuddin Siddiqui
861 Views
In data analysis, we need to be very cautious about repeated values because they might be inputted purposely to create bias in the data and this value could be a zero as well. It happens in situations when we have missing data and the data collector replaces missing values with ... Read More
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Nizamuddin Siddiqui
6K+ Views
If we have many unique elements or repeated in a column of an R data frame and create a graph using that column, either on X-axis or Y-axis then R automatically choses the axes labels, this might not display all the unique values of the column in the plot. Therefore, ... Read More