# How can I make this plot easier to see?

How can I make this plot easier to see? In this plot the waverform is not clear. If I plot with w only from 0 to 1000 it is better but I wonder if there is a way to see in a wider range.

result = LaplaceTransform[
a + ((b - a)/tr t - (b - a)/tr t0) (UnitStep[t - t0] -
UnitStep[t - (t0 + tr)]) + (b - a) UnitStep[t - (t0 + tr)], t,
s];
freq[a_, b_, t0_, tr_, s_] := Evaluate@result;
LogLinearPlot[
Evaluate[Abs@ExpToTrig@freq[2, 3, 10, #, I*w] & /@
Range[ 1 10^-9, 1 10^-6, 10^-7]], {w, 0, 10^9},
GridLines -> Automatic, PlotLegends -> Range[10], PlotPoints -> 500]


• What are you trying to show? Perhaps LogLogPlot would work better. – Bob Hanlon Jun 10 at 15:07
• @BobHanlon I want to check how tr changes frequency range. I just tried LogLogPlot but it doesn't look good either. – anhnha Jun 10 at 15:18
• You have to plot over a very narrow domain, or you'll get a mess. E.g., {w, 9*10^6, 9.000002*10^6} or {w, 9*10^8, 9.00000002*10^8}. To check dependence on tr, perhaps Simplify[Abs@ExpToTrig@freq[2, 3, 10, tr, I*w], 1 10^-9 < tr < 1 10^-6] // ComplexExpand // FullSimplify is sufficiently simple to analyze. – Michael E2 Jun 10 at 16:13
• @MichaelE2: Doesn't work for me. – user64494 Jun 10 at 17:14

It would be preferable if you limited the number of functions being displayed to one or at most two. You can do this with Manipulate

Clear["Global*"]

freq[a_, b_, t0_, tr_, s_] =
LaplaceTransform[
a + ((b - a)/tr t - (b - a)/tr t0) (UnitStep[t - t0] -
UnitStep[t - (t0 + tr)]) + (b - a) UnitStep[t - (t0 + tr)], t, s] //
Simplify;

trRng = Range[10^-9, 10^-6, 10^-7];

funcs = Simplify@ComplexExpand@Abs@
freq[2, 3, 10, #, I*w] & /@ trRng;


To selectively display the functions:

Manipulate[
If[sel === {}, sel = {1}];
pltType[Evaluate@funcs[[sel]], {w, 0, 10^9},
PlotStyle -> ColorData[97, "ColorList"][[sel]],
GridLines -> Automatic,
PlotLegends -> LineLegend[
ColorData[97, "ColorList"][[sel]],
N[10^7*trRng[[sel]]],
LegendLabel -> Style[#, 12, Bold] &@
StringForm[" * tr", Superscript[10, 7]]],
PlotPoints -> 200, (* flavor to taste *)
MaxRecursion -> 5,
WorkingPrecision -> 20,
ImageSize -> Medium],
{{pltType, LogLinearPlot,
Style["Plot type", 12]}, {LogLinearPlot -> LogLinear,
LogLogPlot -> LogLog}},
Delimiter,
{{sel, {1}, Style[#, 12] &@
StringForm[" * tr", Superscript[10, 7]]},
Thread[Range[10] -> N[10^7 trRng]], ControlType -> CheckboxBar}]
`

Note that when displaying more than one function, you can move a function to the front by unchecking and then rechecking the box for that function.