Using num2str on a graph

I'm trying to concatentate num2str() in a text function on a graph, label on a graph.

text(2.4,2000,['test' num2str(Dselect)]), where have I gone wrong on the syntax?

I'm using the [x,y]=ginput(n) function to bring back some coordinates will I be able to display them in the text function with num2str()? In the example I gave Dselect is x.