How can i use a variable in my text(...) - command?

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ymax_woehler is a variable with the value 30. How can i use this variable in my text(...)-command? With num2str(ymax_woehler)?
text(20,18,'\sigma_{a,1}= ymax_woehler')
Thank you.

Accepted Answer

José-Luis on 3 Jan 2017
text(20,18,['\sigma_{a,1}=', num2str(ymax_woehler)])

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