Jesse John

2. Author
3. Jesse John

R Howtos

1. Check for Missing Values Using a Boolean Operator in R
2. Locate R Script and Data Files Without Changing the Working Directory
3. Size Plots in Beamer Slides Made Using R Markdown
4. Identify R Object Properties
5. Create a Ggplot2 Visualization With a Transparent Background
6. Include a Local Image File in an R Presentation
7. Use the Predict Function on a Linear Regression Model in R
8. $ Operator Is Invalid for Atomic Vectors Error in R
9. Create a Random Matrix With Constant Row Sums in R
10. Restart R in R Studio
11. Filter a Data Frame With Multiple Conditions in R
12. Paste Strings Without Spaces in R
13. Use the %*% Operator in R
14. Create a 3D Surface Plot From (x,y,z) Coordinates
15. Create a 3D Perspective Plot in R
16. Test Hypothesis in R
17. Create Combinations and Permutations of Vectors in R
18. Use Cross-Validation for a KNN Classification Model in R
19. Create and Interpret Dummy Variables in R
20. Test for Normality of Data in R
21. Create and Visualize a Correlation Matrix in R
22. Perform Time Series Analysis and Forecasts in R
23. Perform K-Means Clustering in Base R
24. Use the group_by Function in R Dplyr
25. Compute Binomial Coefficients in Java
26. Use the if and if...else Statements in R
27. Customize the PCA Biplot in R
28. Use the Source Function to Run Another R Script
29. Interpret Output of system.time Function in R
30. Convert Multiple Columns From Integer to Numeric Type in R
31. Generate a Regular Sequence of Numbers in R
32. Set Location of Current File as Working Directory in R Studio
33. Add a Calculated Column to a Matrix in R
34. Remove Object Names and Dimnames in R
35. Find the Null Space of a Matrix in R
36. Uninstall R and All Its Packages on Windows
37. Remove User-Defined Objects From the Workspace in R
38. Color-Blind Accessible Colors in Base R
39. Pass Command Line Arguments to R CMD BATCH and Rscript
40. Read a Text File Line by Line in R
41. Vectorized if Function With Multiple Conditions in R
42. Sum of Selected Columns of an R Data Frame
43. Install R Packages From Source
44. Break a for Loop in R
45. Drop Multiple Columns From a Data Frame Using Dplyr
46. Stop Running R Code With the Keyboard or Mouse
47. Export a Data Frame From R to Microsoft Excel
48. Calculate the R-Squared Statistic in R
49. Remove the First Character From a String in R

Python How-To's

1. Get Max Heap in Python
2. Differentiate Iterator and Generator in Python
3. Read a Text File and Print Its Contents in Python
4. Print a Multiplication Table in Python Using Basic Programming Concepts
5. Use and in Python