f [x_] := (x + ln[x] - 3)
Plot[f[x], {x, 0, 5}]
How come this comes out with an empty graph? I tried this and same results:
Plot[[x] + ln[x] - 3, {x, 0, 4}]
I'm new to Mathematica and confused why all my graphs come oute mpty
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1 Answer
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If your plot doesn't show anything, it's often helpful to look what your plotted function does. If you evaluate e.g. f[1] in your notebook, you'll see:
-1 + ln[1]
That's because there is no build-in function called ln. You probably want Log.
answered Apr 26, 2016 at 5:48
lnis not a built-in function. Change this toLog[x]. $\endgroup$=, and it should show an orange equal sign, then if you type "plot x + ln(x) - 3 from 0 to 5" it gives this: i.stack.imgur.com/5hutm.png $\endgroup$