matlab plot legend variable

Question

My question is about the legend entry of a matlab plot.

I would like to have the input variables in the legend so that it looks like 'A_1 B_2'. A,1,B and 2 are input arguments in the variables letter1, number1, letter2, number2.

Answer 1

You can specify any names as inputs to the legend. Your question really seems to be about how to concatenate variables into a single string. Usually, the easiest way to do this is with the [] operators.

figure()
hold on
h1 = plot(1:10)
h2 = plot(5:15)
legend([letter1,'_',num2str(number1)],...
       [letter2,'_',num2str(number2)])

Answer 2

If it was the case, maybe you can just set it at the ending of the plot command and title, for instance:

g <- make_empty_graph() # crate a new canvas to show this example
plot(g) # just to pup up the canvas created

labeling:

legend("bottomleft", legend=c("legend1", "legend2", "legend"), lty=c(1,2,3), lwd=c(2.5,2.5,2.5), col=c("black", "burlywood4", "skyblue"))