从 DataFrame 创建矩阵

Question

I have a dataframe with several columns, including Department and ICA. I need to create a matrix where the rows are the departments, and the columns are ICA values (they range from bad-acceptable-good).

So position r,c would be a number that shows how many observations of ICA were recorded for each department. For example, if Amazonas is row 1 and Acceptable is column 3, position (1,3) would be the number of acceptable observations for Amazonas.

Thanks!

Answer 1

You can get values from your DataFrame using integer-based indexing with the DataFrame.iloc method. This seems to do what you need.

For example, if df is your DataFrame, then df.iloc[0, 2] will give you the value at the first row and third column.