Challenge No. 200: In the question table, direct connections between people are provided.
Solved using:Excel (IF, IFNA, INDEX), Power Query (List.Transform, Text.End), Python, Python in Excel, and R.
Omid Challenges
Including all the Excel Power BI Power Query Python R challenges designed by Omid.
Column Combining! Part 2
Challenge No. 199: Given multiple columns, concatenate them based on the order presented on the pattern column using space as a delimiter.
Solved using:Excel (BYROW, CHOOSECOLS, DROP), Google Sheets, Power Query (List.Transform, Text.Combine, Text.Split), Python, Python in Excel, and R.
Matrix Calculation! Part 2
Challenge No. 198: Create a formula that, for any ‘n x n’ matrix, calculates z1 to zn, where zi is the sum of all the values in the ith row and the ith column of the matrix.
Solved using:Excel (BYCOL, INDEX, LAMBDA), Google Sheets, Power Query (List.Transform, Table.FromRows, Table.ToColumns), Python, Python in Excel, and R.
Custom Grouping! Part 19
Challenge No. 197: Group the rows sequentially from the top, ensuring that each group contains exactly one missing date.
Solved using:Excel (IF, LET, SCAN), Google Sheets, Power Query (Table.Group, Table.AddIndexColumn), Python, Python in Excel, and R.
Column Splitting! Part 6
Challenge No. 196: Split the ID into two columns:
The first column should contain all letters.
Solved using:Excel (CONCAT, HSTACK, LAMBDA), Google Sheets, Power Query (List.Transform, Text.Select, Table.AddColumn), Python, Python in Excel, and R.
Missing Characters!
Challenge No. 195: In the ID column, the text should follow the format XX/XX/XX/XX (with a ‘/’ after every two characters).
Solved using:Excel (IF, LAMBDA, LEN), Power Query (List.Transform, Text.Combine, Text.Split), Python, Python in Excel, and R.
Pattern Length!
Challenge No. 194: For each date, samples are evaluated based on quality and marked with a “+” sign if they are within range and a “-” sign if they are out of range.
Solved using:Excel (DROP, HSTACK, IF), Google Sheets, Power Query (List.Transform, Text.Remove, Text.Split), Python, Python in Excel, and R.
Custom Grouping! Part 18
Challenge No. 193: Separate sales into weekday sales (Mon-Fri) and weekend sales (Sat-Sun).
Solved using:Excel (DAY, FILTER, GROUPBY), Google Sheets, Power Query (Table.Group, Date.DayOfWeek, Table.AddColumn), Python, Python in Excel, and R.
Table Transformation! Part 24
Challenge No. 192: Any row with a negative quantity should reduce the corresponding value in the previous rows for the related product.
Solved using:Excel (DROP, FILTER, LAMBDA), Google Sheets, Power Query (Table.Group, Table.SelectRows, Table.Sort), Python, Python in Excel, and R.
Column Splitting! Part 5
Challenge No. 191: If an ID contains multiple separators (like -, _, .
Solved using:Excel (HSTACK, LAMBDA, LEN), Google Sheets, Power Query (Text.PositionOf, Table.AddColumn, Table.FromRows), Python, Python in Excel, and R.