Invalid first data argument

The following code:

plot(x,y,'Marker','*','Color','r',x2,y2,'Marker','--','Color','b')

generates this error: "Invalid first data argument".

here x, y and x2, y2 are arrays of same size.

[Kiran Sagar]

x = [1 2 3] ;
y = 2*x ;
x2 = x ;
y2 = x ;

[Image Analyst]

Doesn't matter now. I told you how to fix it below.

Answer 1

[Image Analyst]

'--' is not a valid choice for 'Marker'. Use a valid marker. See the help for a list of them.

Try this:

plot(x,y,'r*-', x2,y2,'bd-');