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How can I plot a function to output a graph, that is defined on the x-axis by various instances of a fixed constant value x, where x is not a machine defined number?

For example, 

Plot[2 + x b, {x, b/2, 2 b}]

is expected to plot a graph for various values of x, with x = b / 2 as min, and x = 2 b as max values respectively.

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  • $\begingroup$ The desired plot consists of the x-axis, is not defined as an array of numbers, rather as a function of b. Where, x, takes different iterations of b, from a min value of b/2 to 2b. $\endgroup$
    – Raz
    Commented Jan 4, 2018 at 13:54

3 Answers 3

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Plot[Evaluate[Table[Callout[ConditionalExpression[2 + x b, b/2 <= x <= 2 b], b], 
 {b, 0, 1, .1}]], {x, 0, 2}]

enter image description here

Or with PlotLabels:

Plot[Evaluate[Table[ConditionalExpression[2 + x b, b/2 <= x <= 2 b], {b, .2, 1, .2}]], 
 {x, 0, 2}, PlotLabels -> Range[.2, 1, .2]]

enter image description here

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You can plot them individually and combine by Show.

Show[Table[Plot[2 + x b, {x, b/2, 2 b}, PlotLabels -> b], {b, 1, 2, 0.1}], 
      PlotRange -> All]

enter image description here

If you want a function which would give you the plot

plot[b_] := Plot[2 + x b, {x, b/2, 2 b}, PlotLabels -> b]

plot[2.3]

enter image description here

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  • $\begingroup$ The desired plot consists of the x-axis, is not defined as an array of numbers, rather as a function of b. Where, x, takes different iterations of b, from a min value of b/2 to 2b. $\endgroup$
    – Raz
    Commented Jan 4, 2018 at 13:55
  • $\begingroup$ Check my new answer. Is it what you are looking for? $\endgroup$
    – Sumit
    Commented Jan 4, 2018 at 16:49
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If b is a varying parameter

Show[Table[Plot[2 + x.b, {x, b/2, 2 b}],{b,{bi,...}}]]

should solve your problem!

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