Problem with the Execute-Script-Operator
I'm trying to generate an attribute Y in a moving sum from another attribute X:
Y(1) = X(1)
for i = 2 ... length(X) {
Y(i) = X(i) + Y(i-1)
}
The Result should look like this:
| X | Y |
| 1 | 1 |
| 0 | 1 |
| 0 | 1 |
| 1 | 2 |
| 0 | 2 |
The problem with my script is that it overwrites my input attribute X. I would be very grateful if someone have a look on the code below. Greetings from Germany
import com.rapidminer.example.table.NumericalAttribute;
import com.rapidminer.tools.Ontology;
ExampleSet input= input[0];
Attributes all_attributes = input.getAttributes();
Attribute bool_attrib = all_attributes.get("X");
Attribute target = AttributeFactory.createAttribute("Y", Ontology.INTEGER)
target.setTableIndex(bool_attrib.getTableIndex());
all_attributes.addRegular(target);
ExampleTable bool_tbl = input.getExampleTable();
for (int i = 0; i < bool_tbl.size(); i++) {
DataRow tmp_DataRow = bool_tbl.getDataRow(i);
if (i == 0)
{
tmp_DataRow.set(target, tmp_DataRow.get(bool_attrib));
}
if (i != 0)
{
tmp_DataRow.set(target, tmp_DataRow.get(bool_attrib) + bool_tbl.getDataRow(i-1).get(target));
}
}
return (input);
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Hi Thrhw31,
I have the same issue in another context.
In my for loop (for exploring the examples) I'm taking the text from a column into a string-variable. Then I count the occurences of a specific character and want wo write the result in a new column. Unfortunately the values of my source-column are overwritten.
Have you got a solution for that issue?
My code:
import com.rapidminer.tools.Ontology
ExampleSet inputExampleSet = input[0];
Attributes inputAttributes = inputExampleSet.getAttributes();
Attribute sourceAttribute = inputAttributes.get("ai_description");
Attribute targetAttribute = AttributeFactory.createAttribute("ai_description_numberOfBulletp", Ontology.INTEGER);
targetAttribute.setTableIndex(sourceAttribute.getTableIndex());
inputAttributes.addRegular(targetAttribute);
for (Example actExample : inputExampleSet) {
int counter = 0;
String actValue = actExample.getNominalValue(sourceAttribute);
for( int i=0; i<actValue.length(); i++ ) {
if(actValue.charAt(i) == '•') {
counter++;
}
}
actExample.setValue(targetAttribute, counter);
}
return(inputExampleSet);
Regards
Johannes
Hi again,
i think the sourceAttribute is overwritten by that line:
actExample.setValue(targetAttribute, counter);
Has anyone an idea to do that in a better way?
Regards
Johannes
Hi,
here is your fixed script:
import com.rapidminer.tools.Ontology
ExampleSet inputExampleSet = input[0];
Attributes inputAttributes = inputExampleSet.getAttributes();
Attribute sourceAttribute = inputAttributes.get("ai_description");
Attribute targetAttribute = AttributeFactory.createAttribute("ai_description_numberOfBulletp", Ontology.INTEGER);
inputAttributes.addRegular(targetAttribute);
inputExampleSet.getExampleTable().addAttribute(targetAttribute);
for (Example actExample : inputExampleSet) {
int counter = 0;
String actValue = actExample.getNominalValue(sourceAttribute);
for( int i=0; i<actValue.length(); i++ ) {
if(actValue.charAt(i) == '•') {
counter++;
}
}
actExample.setValue(targetAttribute, counter);
}
return(inputExampleSet);
You just need to call "inputExampleSet.getExampleTable().addAttribute(targetAttribute);" after adding a new attribute to the Attributes.
Regards,
Marco
Solved!
Thanks a lot!
Hi,
here is your fixed script:
import com.rapidminer.tools.Ontology
ExampleSet inputExampleSet = input[0];
Attributes inputAttributes = inputExampleSet.getAttributes();
Attribute sourceAttribute = inputAttributes.get("ai_description");
Attribute targetAttribute = AttributeFactory.createAttribute("ai_description_numberOfBulletp", Ontology.INTEGER);
inputAttributes.addRegular(targetAttribute);
inputExampleSet.getExampleTable().addAttribute(targetAttribute);
for (Example actExample : inputExampleSet) {
int counter = 0;
String actValue = actExample.getNominalValue(sourceAttribute);
for( int i=0; i<actValue.length(); i++ ) {
if(actValue.charAt(i) == '•') {
counter++;
}
}
actExample.setValue(targetAttribute, counter);
}
return(inputExampleSet);
You just need to call "inputExampleSet.getExampleTable().addAttribute(targetAttribute);" after adding a new attribute to the Attributes.
Regards,
Marco
what you need is the Integrate operator from the Value Series extension. This will get the job done without any coding
Best regards,
Marius