Parse error at x:usage might be invalid matlab syntax

Hi,

I am brand new to MATLAB and need some help understanding why I am getting the following error "Parse error at x:usage might be invalid matlab syntax" when trying to run the followin code:

y = 3x + 2;

plot(x,y)

grid on

Answer 1

[Walter Roberson]

MATLAB has absolutely no implied multiplication. Not anywhere. Not even slipped down behind the sofa cushions.

3x needs a multiplication operator.

[Esa Kesti]

Thanks for the fast reply, there is no multiplication in use here, this should just plot a line on y=3x+2

Would It be possible to get an example how to plot this?

Thanks already

[Walter Roberson]

If there is no multiplication there, then your reference to 3x would have to be a reference to a function or variable whose name begins with the character '3'. However in MATLAB variables and function names must begin with a Latin letter A through Z or a through z.

I am certain that where you wrote 3x that you intend to multiply 3 and x, and that the multiplication is implied by putting the 3 and the x next to each other. However matlab does not support implied multiplication and you must include a multiplication operator.