In the following DataFrame, how do I change the age of Sally without knowing the row number and without changing any other values in the DataFrame? I have looked at the DataFrames, DataframesMeta and Query documentation and could not figure out a clean way of doing it. df = DataFrame(name=["John",…

How is collab_matrix() defined? I think the columns are all pointing to the same array, which happens if you do something like this: julia> using DataFrames julia> a = [0, 0, 0]; julia> dx = DataFrame(AD = a, AE = a); julia> dx[1, 1] = 1; julia> dx 3×2 DataFrame │ Row │ AD │ AE │ │ │ Int6…

DataFrame: how to change value of a cell without knowing the row number

Specific Domains Data

Ajaychat3 March 19, 2019, 8:18am 2

This should work.

df[(df[:name] .== "Sally"),:age]=99

Topic		Replies	Views
How to replace/set/change value in array/dataframe if value is less/greater than? New to Julia	3	5319	December 1, 2020
Mutate a new variable with row numbers Data	4	1373	November 12, 2019
How to add/subtract values in a dataframe or array column? New to Julia	5	2607	August 24, 2020
Easier access to DataFrame's elements General Usage	6	1788	September 28, 2018
How to change row's values of a column matching pattern in Julia? New to Julia	3	1302	March 3, 2021

DataFrame: how to change value of a cell without knowing the row number

Related topics