How to make a morse code encoder using switch case?

I am trying to make a morse code encoder for a school project. I have all of my desired variables accounted for their respective morse code equivalents, but I cannot get the function to read more than one variable without it displaying a "invalid input argument". I also need it to stop once there are no more elements to read from. I have been using switch case for this encoder function. Any suggestions as to how I should approach this problem?

[John D'Errico]

I think you need to learn to use vectors and arrays.

Don't write a function that requires you to enter many arguments, when a single vector will suffice.

Answer 1

[Walter Roberson]

You can use techniques similar to https://www.mathworks.com/matlabcentral/answers/369254-how-can-i-shorten-my-code-via-loading-a-data-chart-help#answer_293154