Adding a column to a table

I am trying to add a column , Position_Rating , to table T.

I would like the column to display a value of either 1, 2 or 3 depending on the If statement. I keep on getting an error "comparison between string and double is not supported".

Can anyone help me please? I have attached an image of the script.

[Geoff Hayes]

Callum - what can you tell us about the data in the table? Are the data types (for the variables) strings or numeric? The error message suggests that you are trying to compare a string with a number though it is unclear which comparison is failing... Please consider attaching your code and a small data sample (as a mat file).

[Walter Roberson]

Please show

head(T, 1)

[Kavya Vuriti]

Hi,

What are the data types of data in columns named as "Horizontal_Travel_m" and "Vertical_Travel_m"? And in which line are you facing error?