How can I change the font size of the Legend? I have to plot 5 functions, and I already wrote the code, with the colors and so on.
But when I write the final code for the PlotLegends, that is
PlotLegends -> Placed[{Style["\[Nu] = 0", Black, 10], ["\[Nu]=0.25", Red, 10],["\[Nu]=0.5", Green, 10] AND SO ON }, {0.2, 0.7}] It doesn't work.
I want to change the plot legend size, in order to have a better plot.
LineLegend is the function that ultimately constructs the legend for Plot. It has a lot of options that can be modified to adjust the appearance of the legend. If you're trying to control the size, the most useful options are probably
LabelStyle: change the overall style for the labels, including font sizeLegendMarkerSize: control how long the sample lines areLegendMargins: control how much space is left around the legendLegendLayout: switch from column to rowHere are some examples of each of these options being used:
{Framed[LineLegend[{Red, Green, Blue}, {"red", "green", "blue"}]], Framed[LineLegend[{Red, Green, Blue}, {"red", "green", "blue"}, LabelStyle -> 10]], Framed[LineLegend[{Red, Green, Blue}, {"red", "green", "blue"}, LegendMarkerSize -> 5]], Framed[LineLegend[{Red, Green, Blue}, {"red", "green", "blue"}, LegendMargins -> 0]], Framed[LineLegend[{Red, Green, Blue}, {"red", "green", "blue"}, LegendLayout -> "Row"]]} 
Individually they may not be much smaller, but using them together can have a much bigger effect.
Framed[LineLegend[{Red, Green, Blue}, {"red", "green", "blue"}, LabelStyle -> 10, LegendMarkerSize -> 5, LegendMargins -> 0]] 
Plot[Table[ChebyshevT[k, x], {k, 1, 3}] // Evaluate, {x, -1, 1}, PlotLegends -> Placed[LineLegend[MapThread[Style, {{"k = 1", "k = 2", "k = 3"}, {Black, Red, Green}}], LabelStyle -> 10], {0.25, 0.65}]]$\endgroup$LabelStylesetting:LabelStyle -> {10, FontFamily -> "Times New Roman"}. Please read the docs forLineLegend[], it's all there. $\endgroup$