Array indices must be positive integers or logical values. Error

Hey I m trying to plot these 2 functions, but when runing it it tells me : "Array indices must be positive integers or logical values." my workspace is empty.

I would be happy to learn what is going wrong...

Thanks

clear

x1= -2:0,01:2;

f1 = x1.^2-1;

f2 = sin(x1);

h1 = plot(x1,f1(x1),'b',x1,f2(x1),'r').grid;

Answer 1

[Stephen23]

x1= -2:0.01:2; % decimal comma -> point
f1 = x1.^2-1;
f2 = sin(x1);
h1 = plot(x1,f1,'b',x1,f2,'r') % removed superfluous indexing

h1 = 
  2×1 Line array:

  Line
  Line

[Grégoire]

Thanks !

[Stephen23]

@Grégoire: if it helped please remember to click the accept button.