Parse error at x:usage might be invalid matlab syntax

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Esa Kesti
Esa Kesti 2021-5-10
评论： Walter Roberson 2021-5-11
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

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回答（1 个）

Walter Roberson
Walter Roberson 2021-5-10
MATLAB has absolutely no implied multiplication. Not anywhere. Not even slipped down behind the sofa cushions.
3x needs a multiplication operator.
  2 个评论
Esa Kesti
Esa Kesti 2021-5-10
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
Walter Roberson 2021-5-11
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.

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