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POR Using a for() loop to fill one dataframe with another
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2011-06-02T19:49:11.923
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I have two dataframes and I wish to insert the values of one dataframe into another (let's call them <code>DF1</code> and <code>DF2</code>). <code>DF1</code> consists of 2 columns 1 and 2. Column 1 (<code>col1</code>) contains characters a to z and <code>col2</code> has values associated with each character (from a to z) <code>DF2</code> is a dataframe with 3 columns. The first two consist of every combination of <code>DF1$col1</code> so: aa ab ac ad etc; where the first letter is in <code>col1</code> and the second letter is in <code>col2</code> I want to create a simple mathematical model utilizing the values in <code>DF1$col2</code> to see the outcomes of every possible combination of objects in <code>DF1$col1</code> The first step I wanted to do is to transfer values from <code>DF1$col2</code> to <code>DF2$col3</code> (values from <code>DF2$col3</code> should be associated to values in DF2col1), but that's where I'm stuck. I currently have <pre><code>for(j in 1:length(DF2$col1)) { ## this part is to use the characters in DF2$col1 as an input ## to yield the output for DF2$col3-- input=c(DF2$col1)[j] ## This is supposed to use the values found in DF1$col2 to fill in DF2$col3 g=DF1[(DF1$col2==input),"pred"] ## This is so that the values will fill in DF2$col3-- DF2$col3=g } </code></pre> When I run this, <code>DF2$col3</code> will be filled up with the same value for a specific character from <code>DF1</code> (e.g. <code>DF2$col3</code> will have all the rows filled with the value associated with character "a" from <code>DF1</code>) What exactly am I doing wrong? Thanks a bunch for your time
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R Using a for() loop to fill one dataframe with another
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