Plot not displaying x axis correctly?

Hello, I am making a function that creates a y value for a range of x values, say -7 to 7. I enter in x = (-7:7), put it through the function, and get values for Y. but then, when I plot it, the X axis is labeled according to column rather than value, as in the axis displays 0 through 15 rather than -7 to 7. how do I fix this?

Answer 1

[dpb]

Show us code to prove it, but, from the symptom described you wrote something like:

x=-7:7;
y=yourfunction(x);
plot(y)

which would display what you described (and have done precisely what you told MATLAB to do). With no x passed to it, plot doesn't know anything at all about the fact you defined x somewhere else; all it can do is use what it was given.

plot(x,y)

is the correct syntax.

HINT: Read the documentation before crying wolf! It'll be faster most of the time than waiting for somebody here to see and answer. :)

[Charles Amacker]

Thank you, I was just using the plot function at the toolbar and wasnt entering any syntax at all. Entering that custom syntax helped. Thanks again!

[dpb]

I never use any of that stuff so dunno what it would take to add the x variable...but if it's a "just plot y" button, then the same thing would be true--it wouldn't know anything about what to pass to plot() for the x variable without being told somehow.