# Calculations on particular columns in a table created using dash-table-experiments

**URL:** https://community.plotly.com/t/calculations-on-particular-columns-in-a-table-created-using-dash-table-experiments/7803
**Category:** Dash Python
**Created:** [January 18, 2018, 1:49pm UTC](https://community.plotly.com/t/calculations-on-particular-columns-in-a-table-created-using-dash-table-experiments/7803 "2018-01-18T13:49:23Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Rishikesh\_007](https://avatars.discourse-cdn.com/v4/letter/r/848f3c/32.png) [@Rishikesh\_007](https://community.plotly.com/u/Rishikesh_007)
#### Post date: [January 18, 2018, 1:49pm UTC](https://community.plotly.com/t/calculations-on-particular-columns-in-a-table-created-using-dash-table-experiments/7803/1 "2018-01-18T13:49:23Z")

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![question_forum](https://us1.discourse-cdn.com/flex024/uploads/plot/original/2X/a/acd3d713c5d150b0df000d673481d8c8decc43e9.PNG)

I am trying to perform subtraction of column ‘def’ (should be interactive) and column ‘abc’ and want to store the result in column ‘xyz’. I am using callbacks but not getting exactly how to read input from single column (def) in a table and after performing some calculations, how to write the result into the same table’s column (xyz). Data is stored in csv currently.

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### Author: ![chriddyp](https://sea2.discourse-cdn.com/flex024/user_avatar/community.plotly.com/chriddyp/32/16855_2.png) [@chriddyp](https://community.plotly.com/u/chriddyp)
#### Post date: [January 18, 2018, 5:17pm UTC](https://community.plotly.com/t/calculations-on-particular-columns-in-a-table-created-using-dash-table-experiments/7803/2 "2018-01-18T17:17:50Z")

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See [[Solved] Updating a Dash Datatable rows with row\_update and rows](https://community.plotly.com/t/solved-updating-a-dash-datatable-rows-with-row-update-and-rows/6573/2)