Simple matlab programming question

[MisterPants]

I'm trying to change the color of plot lines with the index of a for loop. I have a long if list that like this:
elseif(jm==6)
ls='b';

but I get an error on:
plot(t,y(1,,'ls-');

whereas I get a blue line from
plot(t,y(1,,'b-');

How do I fix it?

 

[Hector13]

you probably want something like:

plot(t, y(1,, sprintf('%s-', ls));