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Vectors

I am trying to write in component form, using \usepackage{amsmath}, \usepackage{amssymb} and \usepackage{amsbsy}. When I write \vij, there seems to be a mistake and the following appears. I downloaded an environments package online and I manage to write vectors in other forms quite well. If anyone could please advise where I went wrong it would be great!

FYI, the environments package include the following:

Environments package and Environments Package 2

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    Hello and welcome to Tex. Please do not post pictures of code, but the code itself. If possible, provide a MWE that compiles proberly or produces the error you have. – Roland Jan 13 at 4:55
  • You also need \usepackage{ifthen,xstring}. – Werner Jan 13 at 5:43
  • @Werner, got it. Thank you so much! – JC1 Jan 13 at 23:34
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Your macros use \ifthenelse conditionals supplied by ifthen and xstring. Include those in your preamble as well and things should compile as expected:

\usepackage{ifthen,xstring}

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