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Steps to follow for uploading server-side functions:

In the opal server click the Administration option and under the Data Analysis section click the DataSHIELD option.
Under the section Methods choose the type of your function; Aggregate or Assign.

Aggregate functions are the functions that return non-disclosive information to the client

DataSHIELD > How to upload a server-side function > aggregate.png

Assign functions are the functions that do not return their output to the client but rather save it on the server

Click the option Add Method, write the Name of your function and choose the Type R script.

DataSHIELD > How to upload a server-side function > my-function-rscript.png

Under the section Function copy and paste your code without copying the name of the function.

DataSHIELD > How to upload a server-side function > my-function-script-save.png

To check and use the new uploaded function you should logout of the Opal training servers from the DataSHIELD client.

datashield.logout(opals)