Matlab Plotting with Variable Subscripts

Question

So I need to plot a function, let's say it's: y = sin( x_k )

But I can only write the matlab code like:

x = -pi : .1 : pi;
y = sin(x);
plot(x,y);

If I try to do x_k, then it cries about not knowing what k is. Any idea how I can plot functions with variables that contain subscripts (the subscripts are just descriptive, they don't hold any value)? Thanks

Where do you want the subscript to appear, in the plot, say the legend? You cannot have subscripts in the code itself and to a limited extent in symbolic expressions. — Oleg

yuk yuk · Accepted Answer · 2013-04-12T14:57:48

Variables cannot have subscripts. You don't have to reproduce the formula exactly in a MATLAB statement. This is fine to name variable just x, or xk, or x_k, etc.

On the other hand, if you have multiple vectors that you want to associate with the same name, you can put them into a cell array and get each vector as x{k}.

You can use subscripts in axes labels, title and text annotations using Tex (default) or Latex interpretor. Use underscore character followed by subscript in a text string.

title('y = sin(x_k)')

or

title('y = sin(x_{several chars})')

Matlab Plotting with Variable Subscripts

1 Answers