How to select specific lines and specific columns Please I'm a beginner in using R and I work on database.
I have  a database that contain lot of columns and lines, like this for example
Column1   Column2 
5            T1
1            T2
1            T3
1            T1
2            T1
1            T1
2            T1
1            T1

I want to extract just lines that have the value 1 in column 1 and Value T1 in Column 2
So the result I want is
Column1   Column2 
1            T1
1            T1
1            T1

Can you tell me please how I can do that
Thank you very much
You can simply use subset function in R and use the code given below,
    new_dataframe &lt;- 
    subset(name_of_your_dataframe,Column1 == 1 &amp;&amp; 
    Column2 ==  &quot;T1&quot;)

Please keep in mind that R is case sensitive and you should be careful while using the variable names.