simulink undefined funciton or variables

I am doing a simulink project of robotic arm and this is my diagram so far.
You see the red color certain blocks, it says unrecognized function or variable. How do I fix this?
The bottom image shows what my diagram will look like and I can't seem to find big black box anywhere which connest my 4 outputs, x1,x2,x3,x4.
Any help please?

 采纳的回答

It is a "Mux" block or a "Bus Creator" block.

3 个评论

Thanks for your response.
And do you know how to fix those undefined function or variables?
You just need to assign the variable in the base workspace, e.g. mgk=1;
Last question, How do I add equations on the wires? I can set the variables but not entier equations.
Thanks again

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