Symbolic vectors 'invalid variable name'
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I am attempting to create a symbolic vector precisely like the one explained here.
Starting with a fresh MATLAB environment, the code:
syms a [1 4]
Causes an error: "Error using syms (line 222). Invalid variable name."
This code creates a 1x1 sym object 'a', but not the expected 1x4 symbolic vector. The exact same error occurs on my own computer running R2018a (academic) and university computers running R2018b (academic). The syms toolbox seems to be working fine as simply using 'syms a' works fine.
All other similar errors seem to be caused by a missing symbolic toolbox or with more complicated code. I can't figure out why something so simple is failing on both systems. Any suggestions are very welcome.