"R extension - how to get started"

marie

Hey there,

I am really new to the use of RapidMiner and R, and well I did not find anything in the internet on how to get started with the r Extension in RapidMiner that really breaks it down to the basics. So I just tried some very simple things out like the max of a column.

the script is the following:

rm_main = function(data)
{
max($Temperature)
return(data)
}

and the error message is:

The script yould not be parsed. Please check your R script.

[1] "script.R:5:5: unexpected '$' (....)"

Do you know how to solve it?

Or do you have something were one can learn how to get started with the use of the R extension in RapidMiner with just basic knowledge?

Thanks in advance

Marie

Ah and here is the xml:

<宏/ >






<操作符= " true " class = " r_scr激活ipting:execute_r" compatibility="7.2.000" expanded="true" height="82" name="Execute R" width="90" x="246" y="85">
<参数键= "脚本" value = " rm_main =函数(data)
{
 max($Temperature)
}
"/>

Thomas_Ott

Hi Marie,

That means that the resulting R script created an object that RapidMiner can't visualize in the results tab, this is why I added the print statement where you can see the max temp in Log View. Take a look at the sample tutorial processes loaded for the Execute R operator. Just right click on the operator and click on description. There will be a link for "Jump to Tutorial Processes."

There about 4 different R examples which explain a bit on how you can embed your scripts inside RapidMiner. Good luck!

Thomas_Ott

Hi,

Working with the Execute R operator is pretty straight forward once you understand how RM is delivering the data to the function. See your sample script modified.

RM is sending it's data to the Execute R script and translates it via the data.tables package. The raw data comes in as "data" via the function(data). From there I assign it to a golf <- data datafram AND then extract out the column Temperature via output <- max(golf$Temperature)

Then I return the output as an object.

I added a print statement so you can see the results in your LOG view.

<宏/ >






<操作符= " true " class = " r_scr激活ipting:execute_r" compatibility="7.2.000" expanded="true" height="82" name="Execute R" width="90" x="179" y="85">
<参数键= "脚本" value = " rm_main =函数(data)
{
golf <- data

output <- max(golf$Temperature)

print(str(output))

return(output)
}
"/>

marie

Hey Thomas_Ott,

thank you very much for your quick reply.

It seems very logical what you write.

But when I copield the XMl all I get in the Resluts view is:

File

Memory buffered file

What does that mean?

With kind regards

Marie