Simple question about functions

Question

JP 2013-6-21

0
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https://ww2.mathworks.cn/matlabcentral/answers/79808-simple-question-about-functions

Hello, just a simple question about functions. What I want to do is use a function in main code, and create a new variable from within a structure. My main code reads

 practicefcn()
 x=data1.x;

My function reads

 function [ data1,x ] = practicefcn()
 data1.x=5;
 data1.y=4;
 end

This gives me an error. Hopefully you see what I want to do. I want to create a datastructure where x = 5 within that data structure, but also I want to create a separate variable where x = 5, defined outside of the data structure. Thanks!