# How do I plot a parametric family of curves given a list of parameter values?

I tried plotting the function shown below in Mathematica; however the plot showed nothing. Could you help me explain it?

Note that here D' = 1- x. ClearAll[a, x];
parameters = {0, 0.01, 0.02, 0.05, 0.1};
Plot[(1/((1 - x)*(1 + a/(1 - x)^2))) /@ parameters, {x, 0, 1},
PlotRange -> {{0, 1}, {0, 5}}] • Try Function[a, (* your function *)] /@ parameters. – J. M.'s ennui Feb 18 '16 at 6:33
• Please, post code, not images and try to format your question as to present a clear, self-contained entity. Any relevant bits and pieces -- error messages, external definitions you are using are, of course, necessary. – user9660 Feb 18 '16 at 7:34
• – user9660 Feb 18 '16 at 7:34
• Thank you, I will study it carefully. – anhnha Feb 18 '16 at 7:35

There are a number of ways to do this, e.g.:

f[a_, x_] := 1/((1 - x) (1 + a/(1 - x)^2))
parameters = {0, 0.01, 0.02, 0.05, 0.1};
Plot[Evaluate[f[#, x] & /@ parameters], {x, 0, 1},
PlotRange -> {0, 5},
PlotLegends ->
Table[Row[{"\!$$\*SubscriptBox[\(R$$, $$L$$]\)/R=", j}], {j,
parameters}]] or using Table:

Plot[Evaluate[Table[f[j, x], {j, parameters}], {x, 0, 1}]]