Plot Line Style Error Message

I tried

plot(x,y,'--','blue')

with valid data x and y (that I can plot without these options) and got an error message of "invalid data argument." Please advise.

Answer 1

[Adam Danz]

Option 1

plot(x,y,'b--')

option 2

plot(x,y,'--','color','blue') % or 'b', or [0 0 1]

[alpedhuez]

Thank you.