Division creating many columns

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I am trying to calculate the % decrease of air pollution in two seperate scenarios and put the answer in a new column variable

However, when I do this it creates the same number of columns as in my table already, all populated with 0, and 1 column the correct answer.

When i split up this code and do it seperately it occurs during the division step

I am using the following code:

Table.PnC_Removal = (((Table.Concentration_S1 - Table.Concentration_S2)/ Table.Concentration_S1)* 100)

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Answer 1

Steven Lord 2020-4-8

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Use element-wise division not matrix division.

Table.PnC_Removal = (((Table.Concentration_S1 - Table.Concentration_S2)./ Table.Concentration_S1)* 100)

Note the extra period that's part of the division sign.