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How could I plot lines for the x axis as well?

Cornel B.
Posted 2 years ago

Hello,

f[x_] := x^2
Plot[{f[x], f[1], f[2]}, {x, 0, 3}, PlotRange -> {{0, 5}}, 
 PlotLegends -> "Expressions"]

enter image description here

How could I plot lines on the x-axis at the points x=1 and x=2 (the points of the function f[1] and f[2])?

Something like that:

enter image description here

or

enter image description here

or

enter image description here

or

enter image description here

or

enter image description here

Thank you.
POSTED BY: Cornel B.
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Cornel B.
Cornel B.
Posted 2 years ago

Hello,

I come back to this post a little:

How could I plot lines also for the x-axis, but not restrict one of the Gridlines axes?

Another reason why I'm interested in this is that the lines that Gridlines gives us for the x-axis are sometimes harder to see (I don't know how I could edit them to look about the same thickness as f[1] and f[2] and to have the same color or any color than Gridlines gives us by default), and on the other hand we restrict the display of Gridlines for one axis (x-axis) (maybe someone still would like to have displayed on both axes Gridlines).

Is it possible this thing?

enter image description here

The below image was edited...to better understand how I would like the lines to look for x=1 and x=2. enter image description here enter image description here

or enter image description here
POSTED BY: Cornel B.

One possibility is to use the option GridLines:

Plot[{f[x], f[1], f[2]}, {x, 0, 3}, PlotRange -> {{0, 5}}, 
 PlotLegends -> "Expressions", GridLines -> {{1, 2}, None}]

or simply:

Plot[f[x], {x, 0, 3}, PlotRange -> {{0, 5}}, GridLines -> Transpose[{#, f[#]} & /@ {1, 2}]]
POSTED BY: Henrik Schachner
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