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I want to plot a function for different values of my parameter, 'y_a', where a is a subscript. Here is my code:

f1[x_] := x/0.15 - 1/0.8
f2[x_] := x/0.25 - 1/0.8
f3[x_] := x/0.45 - 1/0.8

Plot[{f1[x], f2[x], f3[x]}, {x, 0, 0.9}, PlotTheme -> "Monochrome", 
 AxesLabel -> {"x","f(x)"}, PLotLabels -> {"y_a=0.15","y_a=0.25","y_a=0.45"}]

When I execute my code, an extra space between the function and the labels is generated, if I use ctrl+- command to create a subscript. So, I would be grateful if you could tell me how I can remove this extra space.

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2 Answers 2

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Plot[{f1[x], f2[x], f3[x]}, {x, 0, 0.9}, 
 PlotTheme -> "Monochrome", 
 AxesLabel -> {"x", "f(x)"}, 
 PlotLabels ->  Placed[Pane[ToString[Subscript[y, a],StandardForm]<>" = " 
  <>ToString @ #]& /@ {0.15, 0.25, 0.45}, After]]

enter image description here

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  • $\begingroup$ My question was uncleared. Please have a look at my improved question $\endgroup$
    – Yorgos
    Commented Oct 16, 2019 at 12:00
  • $\begingroup$ @Yorgos, please see the updated answer. $\endgroup$
    – kglr
    Commented Oct 16, 2019 at 12:05
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Plot[{f1[x], f2[x], f3[x]}, {x, 0, 0.9}, PlotTheme -> "Monochrome", 
AxesLabel -> {"x", "f(x)"}, 
PlotLabels -> {Row[{Subscript[y, a], "=", 0.15}, "\[ThinSpace]"], 
Row[{Subscript[y, a], "=", 0.25}, "\[ThinSpace]"], 
Row[{Subscript[y, a], "=", 0.45}, "\[ThinSpace]"]}]

enter image description here

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